3586986416
This is the 2nd attempt. The previous was reverted while we figured out the regional mirrors (oops). New plan: k8s.gcr.io is a read-only facade that auto-detects your source region (us, eu, or asia for now) and pulls from the closest. To publish an image, push k8s-staging.gcr.io and it will be synced to the regionals automatically (similar to today). For now the staging is an alias to gcr.io/google_containers (the legacy URL). When we move off of google-owned projects (working on it), then we just do a one-time sync, and change the google-internal config, and nobody outside should notice. We can, in parallel, change the auto-sync into a manual sync - send a PR to "promote" something from staging, and a bot activates it. Nice and visible, easy to keep track of.
1055 lines
37 KiB
Python
1055 lines
37 KiB
Python
#!/usr/bin/env python
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# Copyright 2015 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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import os
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import random
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import shutil
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import subprocess
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import time
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from shlex import split
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from subprocess import check_call, check_output
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from subprocess import CalledProcessError
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from socket import gethostname
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from charms import layer
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from charms.layer import snap
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from charms.reactive import hook
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from charms.reactive import set_state, remove_state, is_state
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from charms.reactive import when, when_any, when_not
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from charms.kubernetes.common import get_version
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from charms.reactive.helpers import data_changed, any_file_changed
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from charms.templating.jinja2 import render
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from charmhelpers.core import hookenv, unitdata
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from charmhelpers.core.host import service_stop, service_restart
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from charmhelpers.contrib.charmsupport import nrpe
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# Override the default nagios shortname regex to allow periods, which we
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# need because our bin names contain them (e.g. 'snap.foo.daemon'). The
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# default regex in charmhelpers doesn't allow periods, but nagios itself does.
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nrpe.Check.shortname_re = '[\.A-Za-z0-9-_]+$'
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kubeconfig_path = '/root/cdk/kubeconfig'
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kubeproxyconfig_path = '/root/cdk/kubeproxyconfig'
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kubeclientconfig_path = '/root/.kube/config'
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os.environ['PATH'] += os.pathsep + os.path.join(os.sep, 'snap', 'bin')
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db = unitdata.kv()
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@hook('upgrade-charm')
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def upgrade_charm():
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# Trigger removal of PPA docker installation if it was previously set.
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set_state('config.changed.install_from_upstream')
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hookenv.atexit(remove_state, 'config.changed.install_from_upstream')
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cleanup_pre_snap_services()
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check_resources_for_upgrade_needed()
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# Remove the RC for nginx ingress if it exists
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if hookenv.config().get('ingress'):
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kubectl_success('delete', 'rc', 'nginx-ingress-controller')
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# Remove gpu.enabled state so we can reconfigure gpu-related kubelet flags,
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# since they can differ between k8s versions
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remove_state('kubernetes-worker.gpu.enabled')
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remove_state('kubernetes-worker.cni-plugins.installed')
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remove_state('kubernetes-worker.config.created')
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remove_state('kubernetes-worker.ingress.available')
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remove_state('worker.auth.bootstrapped')
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set_state('kubernetes-worker.restart-needed')
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def check_resources_for_upgrade_needed():
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hookenv.status_set('maintenance', 'Checking resources')
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resources = ['kubectl', 'kubelet', 'kube-proxy']
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paths = [hookenv.resource_get(resource) for resource in resources]
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if any_file_changed(paths):
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set_upgrade_needed()
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def set_upgrade_needed():
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set_state('kubernetes-worker.snaps.upgrade-needed')
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config = hookenv.config()
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previous_channel = config.previous('channel')
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require_manual = config.get('require-manual-upgrade')
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if previous_channel is None or not require_manual:
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set_state('kubernetes-worker.snaps.upgrade-specified')
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def cleanup_pre_snap_services():
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# remove old states
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remove_state('kubernetes-worker.components.installed')
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# disable old services
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services = ['kubelet', 'kube-proxy']
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for service in services:
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hookenv.log('Stopping {0} service.'.format(service))
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service_stop(service)
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# cleanup old files
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files = [
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"/lib/systemd/system/kubelet.service",
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"/lib/systemd/system/kube-proxy.service",
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"/etc/default/kube-default",
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"/etc/default/kubelet",
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"/etc/default/kube-proxy",
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"/srv/kubernetes",
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"/usr/local/bin/kubectl",
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"/usr/local/bin/kubelet",
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"/usr/local/bin/kube-proxy",
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"/etc/kubernetes"
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]
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for file in files:
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if os.path.isdir(file):
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hookenv.log("Removing directory: " + file)
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shutil.rmtree(file)
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elif os.path.isfile(file):
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hookenv.log("Removing file: " + file)
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os.remove(file)
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@when('config.changed.channel')
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def channel_changed():
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set_upgrade_needed()
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@when('kubernetes-worker.snaps.upgrade-needed')
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@when_not('kubernetes-worker.snaps.upgrade-specified')
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def upgrade_needed_status():
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msg = 'Needs manual upgrade, run the upgrade action'
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hookenv.status_set('blocked', msg)
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@when('kubernetes-worker.snaps.upgrade-specified')
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def install_snaps():
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check_resources_for_upgrade_needed()
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channel = hookenv.config('channel')
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hookenv.status_set('maintenance', 'Installing kubectl snap')
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snap.install('kubectl', channel=channel, classic=True)
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hookenv.status_set('maintenance', 'Installing kubelet snap')
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snap.install('kubelet', channel=channel, classic=True)
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hookenv.status_set('maintenance', 'Installing kube-proxy snap')
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snap.install('kube-proxy', channel=channel, classic=True)
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set_state('kubernetes-worker.snaps.installed')
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set_state('kubernetes-worker.restart-needed')
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remove_state('kubernetes-worker.snaps.upgrade-needed')
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remove_state('kubernetes-worker.snaps.upgrade-specified')
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@hook('stop')
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def shutdown():
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''' When this unit is destroyed:
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- delete the current node
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- stop the worker services
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'''
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try:
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if os.path.isfile(kubeconfig_path):
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kubectl('delete', 'node', gethostname().lower())
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except CalledProcessError:
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hookenv.log('Failed to unregister node.')
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service_stop('snap.kubelet.daemon')
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service_stop('snap.kube-proxy.daemon')
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@when('docker.available')
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@when_not('kubernetes-worker.cni-plugins.installed')
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def install_cni_plugins():
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''' Unpack the cni-plugins resource '''
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charm_dir = os.getenv('CHARM_DIR')
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# Get the resource via resource_get
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try:
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resource_name = 'cni-{}'.format(arch())
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archive = hookenv.resource_get(resource_name)
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except Exception:
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message = 'Error fetching the cni resource.'
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hookenv.log(message)
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hookenv.status_set('blocked', message)
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return
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if not archive:
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hookenv.log('Missing cni resource.')
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hookenv.status_set('blocked', 'Missing cni resource.')
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return
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# Handle null resource publication, we check if filesize < 1mb
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filesize = os.stat(archive).st_size
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if filesize < 1000000:
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hookenv.status_set('blocked', 'Incomplete cni resource.')
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return
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hookenv.status_set('maintenance', 'Unpacking cni resource.')
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unpack_path = '{}/files/cni'.format(charm_dir)
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os.makedirs(unpack_path, exist_ok=True)
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cmd = ['tar', 'xfvz', archive, '-C', unpack_path]
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hookenv.log(cmd)
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check_call(cmd)
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apps = [
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{'name': 'loopback', 'path': '/opt/cni/bin'}
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]
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for app in apps:
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unpacked = '{}/{}'.format(unpack_path, app['name'])
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app_path = os.path.join(app['path'], app['name'])
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install = ['install', '-v', '-D', unpacked, app_path]
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hookenv.log(install)
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check_call(install)
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# Used by the "registry" action. The action is run on a single worker, but
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# the registry pod can end up on any worker, so we need this directory on
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# all the workers.
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os.makedirs('/srv/registry', exist_ok=True)
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set_state('kubernetes-worker.cni-plugins.installed')
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@when('kubernetes-worker.snaps.installed')
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def set_app_version():
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''' Declare the application version to juju '''
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cmd = ['kubelet', '--version']
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version = check_output(cmd)
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hookenv.application_version_set(version.split(b' v')[-1].rstrip())
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@when('kubernetes-worker.snaps.installed')
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@when_not('kube-control.dns.available')
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def notify_user_transient_status():
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''' Notify to the user we are in a transient state and the application
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is still converging. Potentially remotely, or we may be in a detached loop
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wait state '''
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# During deployment the worker has to start kubelet without cluster dns
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# configured. If this is the first unit online in a service pool waiting
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# to self host the dns pod, and configure itself to query the dns service
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# declared in the kube-system namespace
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hookenv.status_set('waiting', 'Waiting for cluster DNS.')
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@when('kubernetes-worker.snaps.installed',
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'kube-control.dns.available')
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@when_not('kubernetes-worker.snaps.upgrade-needed')
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def charm_status(kube_control):
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'''Update the status message with the current status of kubelet.'''
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update_kubelet_status()
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def update_kubelet_status():
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''' There are different states that the kubelet can be in, where we are
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waiting for dns, waiting for cluster turnup, or ready to serve
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applications.'''
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services = [
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'kubelet',
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'kube-proxy'
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]
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failing_services = []
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for service in services:
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daemon = 'snap.{}.daemon'.format(service)
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if not _systemctl_is_active(daemon):
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failing_services.append(service)
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if len(failing_services) == 0:
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hookenv.status_set('active', 'Kubernetes worker running.')
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else:
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msg = 'Waiting for {} to start.'.format(','.join(failing_services))
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hookenv.status_set('waiting', msg)
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def get_ingress_address(relation):
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try:
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network_info = hookenv.network_get(relation.relation_name)
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except NotImplementedError:
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network_info = []
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if network_info and 'ingress-addresses' in network_info:
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# just grab the first one for now, maybe be more robust here?
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return network_info['ingress-addresses'][0]
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else:
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# if they don't have ingress-addresses they are running a juju that
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# doesn't support spaces, so just return the private address
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return hookenv.unit_get('private-address')
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@when('certificates.available', 'kube-control.connected')
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def send_data(tls, kube_control):
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'''Send the data that is required to create a server certificate for
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this server.'''
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# Use the public ip of this unit as the Common Name for the certificate.
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common_name = hookenv.unit_public_ip()
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ingress_ip = get_ingress_address(kube_control)
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# Create SANs that the tls layer will add to the server cert.
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sans = [
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hookenv.unit_public_ip(),
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ingress_ip,
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gethostname()
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]
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# Create a path safe name by removing path characters from the unit name.
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certificate_name = hookenv.local_unit().replace('/', '_')
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# Request a server cert with this information.
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tls.request_server_cert(common_name, sans, certificate_name)
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@when('kube-api-endpoint.available', 'kube-control.dns.available',
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'cni.available')
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def watch_for_changes(kube_api, kube_control, cni):
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''' Watch for configuration changes and signal if we need to restart the
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worker services '''
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servers = get_kube_api_servers(kube_api)
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dns = kube_control.get_dns()
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cluster_cidr = cni.get_config()['cidr']
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if (data_changed('kube-api-servers', servers) or
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data_changed('kube-dns', dns) or
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data_changed('cluster-cidr', cluster_cidr)):
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set_state('kubernetes-worker.restart-needed')
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@when('kubernetes-worker.snaps.installed', 'kube-api-endpoint.available',
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'tls_client.ca.saved', 'tls_client.client.certificate.saved',
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'tls_client.client.key.saved', 'tls_client.server.certificate.saved',
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'tls_client.server.key.saved',
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'kube-control.dns.available', 'kube-control.auth.available',
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'cni.available', 'kubernetes-worker.restart-needed',
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'worker.auth.bootstrapped')
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def start_worker(kube_api, kube_control, auth_control, cni):
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''' Start kubelet using the provided API and DNS info.'''
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servers = get_kube_api_servers(kube_api)
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# Note that the DNS server doesn't necessarily exist at this point. We know
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# what its IP will eventually be, though, so we can go ahead and configure
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# kubelet with that info. This ensures that early pods are configured with
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# the correct DNS even though the server isn't ready yet.
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dns = kube_control.get_dns()
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ingress_ip = get_ingress_address(kube_control)
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cluster_cidr = cni.get_config()['cidr']
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if cluster_cidr is None:
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hookenv.log('Waiting for cluster cidr.')
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return
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creds = db.get('credentials')
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data_changed('kube-control.creds', creds)
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# set --allow-privileged flag for kubelet
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set_privileged()
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create_config(random.choice(servers), creds)
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configure_kubelet(dns, ingress_ip)
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configure_kube_proxy(servers, cluster_cidr)
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set_state('kubernetes-worker.config.created')
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restart_unit_services()
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update_kubelet_status()
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apply_node_labels()
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remove_state('kubernetes-worker.restart-needed')
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@when('cni.connected')
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@when_not('cni.configured')
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def configure_cni(cni):
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''' Set worker configuration on the CNI relation. This lets the CNI
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subordinate know that we're the worker so it can respond accordingly. '''
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cni.set_config(is_master=False, kubeconfig_path=kubeconfig_path)
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@when('config.changed.ingress')
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def toggle_ingress_state():
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''' Ingress is a toggled state. Remove ingress.available if set when
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toggled '''
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remove_state('kubernetes-worker.ingress.available')
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@when('docker.sdn.configured')
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def sdn_changed():
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'''The Software Defined Network changed on the container so restart the
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kubernetes services.'''
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restart_unit_services()
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update_kubelet_status()
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remove_state('docker.sdn.configured')
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@when('kubernetes-worker.config.created')
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@when_not('kubernetes-worker.ingress.available')
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def render_and_launch_ingress():
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''' If configuration has ingress daemon set enabled, launch the ingress load
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balancer and default http backend. Otherwise attempt deletion. '''
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config = hookenv.config()
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# If ingress is enabled, launch the ingress controller
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if config.get('ingress'):
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launch_default_ingress_controller()
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else:
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hookenv.log('Deleting the http backend and ingress.')
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kubectl_manifest('delete',
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'/root/cdk/addons/default-http-backend.yaml')
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kubectl_manifest('delete',
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'/root/cdk/addons/ingress-daemon-set.yaml') # noqa
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hookenv.close_port(80)
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hookenv.close_port(443)
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@when('config.changed.labels', 'kubernetes-worker.config.created')
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def apply_node_labels():
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''' Parse the labels configuration option and apply the labels to the node.
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'''
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# scrub and try to format an array from the configuration option
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config = hookenv.config()
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user_labels = _parse_labels(config.get('labels'))
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# For diffing sake, iterate the previous label set
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if config.previous('labels'):
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previous_labels = _parse_labels(config.previous('labels'))
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hookenv.log('previous labels: {}'.format(previous_labels))
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else:
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# this handles first time run if there is no previous labels config
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previous_labels = _parse_labels("")
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# Calculate label removal
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for label in previous_labels:
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if label not in user_labels:
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hookenv.log('Deleting node label {}'.format(label))
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_apply_node_label(label, delete=True)
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# if the label is in user labels we do nothing here, it will get set
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# during the atomic update below.
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# Atomically set a label
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for label in user_labels:
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_apply_node_label(label, overwrite=True)
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# Set label for application name
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_apply_node_label('juju-application={}'.format(hookenv.service_name()),
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overwrite=True)
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@when_any('config.changed.kubelet-extra-args',
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'config.changed.proxy-extra-args')
|
|
def extra_args_changed():
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set_state('kubernetes-worker.restart-needed')
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|
|
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@when('config.changed.docker-logins')
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def docker_logins_changed():
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config = hookenv.config()
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previous_logins = config.previous('docker-logins')
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logins = config['docker-logins']
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logins = json.loads(logins)
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if previous_logins:
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previous_logins = json.loads(previous_logins)
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next_servers = {login['server'] for login in logins}
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previous_servers = {login['server'] for login in previous_logins}
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servers_to_logout = previous_servers - next_servers
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for server in servers_to_logout:
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cmd = ['docker', 'logout', server]
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subprocess.check_call(cmd)
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for login in logins:
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server = login['server']
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username = login['username']
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password = login['password']
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cmd = ['docker', 'login', server, '-u', username, '-p', password]
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subprocess.check_call(cmd)
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set_state('kubernetes-worker.restart-needed')
|
|
|
|
|
|
def arch():
|
|
'''Return the package architecture as a string. Raise an exception if the
|
|
architecture is not supported by kubernetes.'''
|
|
# Get the package architecture for this system.
|
|
architecture = check_output(['dpkg', '--print-architecture']).rstrip()
|
|
# Convert the binary result into a string.
|
|
architecture = architecture.decode('utf-8')
|
|
return architecture
|
|
|
|
|
|
def create_config(server, creds):
|
|
'''Create a kubernetes configuration for the worker unit.'''
|
|
# Get the options from the tls-client layer.
|
|
layer_options = layer.options('tls-client')
|
|
# Get all the paths to the tls information required for kubeconfig.
|
|
ca = layer_options.get('ca_certificate_path')
|
|
|
|
# Create kubernetes configuration in the default location for ubuntu.
|
|
create_kubeconfig('/home/ubuntu/.kube/config', server, ca,
|
|
token=creds['client_token'], user='ubuntu')
|
|
# Make the config dir readable by the ubuntu users so juju scp works.
|
|
cmd = ['chown', '-R', 'ubuntu:ubuntu', '/home/ubuntu/.kube']
|
|
check_call(cmd)
|
|
# Create kubernetes configuration in the default location for root.
|
|
create_kubeconfig(kubeclientconfig_path, server, ca,
|
|
token=creds['client_token'], user='root')
|
|
# Create kubernetes configuration for kubelet, and kube-proxy services.
|
|
create_kubeconfig(kubeconfig_path, server, ca,
|
|
token=creds['kubelet_token'], user='kubelet')
|
|
create_kubeconfig(kubeproxyconfig_path, server, ca,
|
|
token=creds['proxy_token'], user='kube-proxy')
|
|
|
|
|
|
def parse_extra_args(config_key):
|
|
elements = hookenv.config().get(config_key, '').split()
|
|
args = {}
|
|
|
|
for element in elements:
|
|
if '=' in element:
|
|
key, _, value = element.partition('=')
|
|
args[key] = value
|
|
else:
|
|
args[element] = 'true'
|
|
|
|
return args
|
|
|
|
|
|
def configure_kubernetes_service(service, base_args, extra_args_key):
|
|
db = unitdata.kv()
|
|
|
|
prev_args_key = 'kubernetes-worker.prev_args.' + service
|
|
prev_args = db.get(prev_args_key) or {}
|
|
|
|
extra_args = parse_extra_args(extra_args_key)
|
|
|
|
args = {}
|
|
for arg in prev_args:
|
|
# remove previous args by setting to null
|
|
args[arg] = 'null'
|
|
for k, v in base_args.items():
|
|
args[k] = v
|
|
for k, v in extra_args.items():
|
|
args[k] = v
|
|
|
|
cmd = ['snap', 'set', service] + ['%s=%s' % item for item in args.items()]
|
|
check_call(cmd)
|
|
|
|
db.set(prev_args_key, args)
|
|
|
|
|
|
def configure_kubelet(dns, ingress_ip):
|
|
layer_options = layer.options('tls-client')
|
|
ca_cert_path = layer_options.get('ca_certificate_path')
|
|
server_cert_path = layer_options.get('server_certificate_path')
|
|
server_key_path = layer_options.get('server_key_path')
|
|
|
|
kubelet_opts = {}
|
|
kubelet_opts['require-kubeconfig'] = 'true'
|
|
kubelet_opts['kubeconfig'] = kubeconfig_path
|
|
kubelet_opts['network-plugin'] = 'cni'
|
|
kubelet_opts['v'] = '0'
|
|
kubelet_opts['address'] = '0.0.0.0'
|
|
kubelet_opts['port'] = '10250'
|
|
kubelet_opts['cluster-domain'] = dns['domain']
|
|
kubelet_opts['anonymous-auth'] = 'false'
|
|
kubelet_opts['client-ca-file'] = ca_cert_path
|
|
kubelet_opts['tls-cert-file'] = server_cert_path
|
|
kubelet_opts['tls-private-key-file'] = server_key_path
|
|
kubelet_opts['logtostderr'] = 'true'
|
|
kubelet_opts['fail-swap-on'] = 'false'
|
|
kubelet_opts['node-ip'] = ingress_ip
|
|
|
|
if (dns['enable-kube-dns']):
|
|
kubelet_opts['cluster-dns'] = dns['sdn-ip']
|
|
|
|
privileged = is_state('kubernetes-worker.privileged')
|
|
kubelet_opts['allow-privileged'] = 'true' if privileged else 'false'
|
|
|
|
if is_state('kubernetes-worker.gpu.enabled'):
|
|
if get_version('kubelet') < (1, 6):
|
|
hookenv.log('Adding --experimental-nvidia-gpus=1 to kubelet')
|
|
kubelet_opts['experimental-nvidia-gpus'] = '1'
|
|
else:
|
|
hookenv.log('Adding --feature-gates=Accelerators=true to kubelet')
|
|
kubelet_opts['feature-gates'] = 'Accelerators=true'
|
|
|
|
configure_kubernetes_service('kubelet', kubelet_opts, 'kubelet-extra-args')
|
|
|
|
|
|
def configure_kube_proxy(api_servers, cluster_cidr):
|
|
kube_proxy_opts = {}
|
|
kube_proxy_opts['cluster-cidr'] = cluster_cidr
|
|
kube_proxy_opts['kubeconfig'] = kubeproxyconfig_path
|
|
kube_proxy_opts['logtostderr'] = 'true'
|
|
kube_proxy_opts['v'] = '0'
|
|
kube_proxy_opts['master'] = random.choice(api_servers)
|
|
|
|
if b'lxc' in check_output('virt-what', shell=True):
|
|
kube_proxy_opts['conntrack-max-per-core'] = '0'
|
|
|
|
configure_kubernetes_service('kube-proxy', kube_proxy_opts,
|
|
'proxy-extra-args')
|
|
|
|
|
|
def create_kubeconfig(kubeconfig, server, ca, key=None, certificate=None,
|
|
user='ubuntu', context='juju-context',
|
|
cluster='juju-cluster', password=None, token=None):
|
|
'''Create a configuration for Kubernetes based on path using the supplied
|
|
arguments for values of the Kubernetes server, CA, key, certificate, user
|
|
context and cluster.'''
|
|
if not key and not certificate and not password and not token:
|
|
raise ValueError('Missing authentication mechanism.')
|
|
|
|
# token and password are mutually exclusive. Error early if both are
|
|
# present. The developer has requested an impossible situation.
|
|
# see: kubectl config set-credentials --help
|
|
if token and password:
|
|
raise ValueError('Token and Password are mutually exclusive.')
|
|
# Create the config file with the address of the master server.
|
|
cmd = 'kubectl config --kubeconfig={0} set-cluster {1} ' \
|
|
'--server={2} --certificate-authority={3} --embed-certs=true'
|
|
check_call(split(cmd.format(kubeconfig, cluster, server, ca)))
|
|
# Delete old users
|
|
cmd = 'kubectl config --kubeconfig={0} unset users'
|
|
check_call(split(cmd.format(kubeconfig)))
|
|
# Create the credentials using the client flags.
|
|
cmd = 'kubectl config --kubeconfig={0} ' \
|
|
'set-credentials {1} '.format(kubeconfig, user)
|
|
|
|
if key and certificate:
|
|
cmd = '{0} --client-key={1} --client-certificate={2} '\
|
|
'--embed-certs=true'.format(cmd, key, certificate)
|
|
if password:
|
|
cmd = "{0} --username={1} --password={2}".format(cmd, user, password)
|
|
# This is mutually exclusive from password. They will not work together.
|
|
if token:
|
|
cmd = "{0} --token={1}".format(cmd, token)
|
|
check_call(split(cmd))
|
|
# Create a default context with the cluster.
|
|
cmd = 'kubectl config --kubeconfig={0} set-context {1} ' \
|
|
'--cluster={2} --user={3}'
|
|
check_call(split(cmd.format(kubeconfig, context, cluster, user)))
|
|
# Make the config use this new context.
|
|
cmd = 'kubectl config --kubeconfig={0} use-context {1}'
|
|
check_call(split(cmd.format(kubeconfig, context)))
|
|
|
|
|
|
@when_any('config.changed.default-backend-image',
|
|
'config.changed.nginx-image')
|
|
@when('kubernetes-worker.config.created')
|
|
def launch_default_ingress_controller():
|
|
''' Launch the Kubernetes ingress controller & default backend (404) '''
|
|
config = hookenv.config()
|
|
|
|
# need to test this in case we get in
|
|
# here from a config change to the image
|
|
if not config.get('ingress'):
|
|
return
|
|
|
|
context = {}
|
|
context['arch'] = arch()
|
|
addon_path = '/root/cdk/addons/{}'
|
|
|
|
context['defaultbackend_image'] = config.get('default-backend-image')
|
|
if (context['defaultbackend_image'] == "" or
|
|
context['defaultbackend_image'] == "auto"):
|
|
if context['arch'] == 's390x':
|
|
context['defaultbackend_image'] = \
|
|
"k8s.gcr.io/defaultbackend-s390x:1.4"
|
|
else:
|
|
context['defaultbackend_image'] = \
|
|
"k8s.gcr.io/defaultbackend:1.4"
|
|
|
|
# Render the default http backend (404) replicationcontroller manifest
|
|
manifest = addon_path.format('default-http-backend.yaml')
|
|
render('default-http-backend.yaml', manifest, context)
|
|
hookenv.log('Creating the default http backend.')
|
|
try:
|
|
kubectl('apply', '-f', manifest)
|
|
except CalledProcessError as e:
|
|
hookenv.log(e)
|
|
hookenv.log('Failed to create default-http-backend. Will attempt again next update.') # noqa
|
|
hookenv.close_port(80)
|
|
hookenv.close_port(443)
|
|
return
|
|
|
|
# Render the ingress daemon set controller manifest
|
|
context['ingress_image'] = config.get('nginx-image')
|
|
if context['ingress_image'] == "" or context['ingress_image'] == "auto":
|
|
if context['arch'] == 's390x':
|
|
context['ingress_image'] = \
|
|
"docker.io/cdkbot/nginx-ingress-controller-s390x:0.9.0-beta.13"
|
|
else:
|
|
context['ingress_image'] = \
|
|
"k8s.gcr.io/nginx-ingress-controller:0.9.0-beta.15" # noqa
|
|
context['juju_application'] = hookenv.service_name()
|
|
manifest = addon_path.format('ingress-daemon-set.yaml')
|
|
render('ingress-daemon-set.yaml', manifest, context)
|
|
hookenv.log('Creating the ingress daemon set.')
|
|
try:
|
|
kubectl('apply', '-f', manifest)
|
|
except CalledProcessError as e:
|
|
hookenv.log(e)
|
|
hookenv.log('Failed to create ingress controller. Will attempt again next update.') # noqa
|
|
hookenv.close_port(80)
|
|
hookenv.close_port(443)
|
|
return
|
|
|
|
set_state('kubernetes-worker.ingress.available')
|
|
hookenv.open_port(80)
|
|
hookenv.open_port(443)
|
|
|
|
|
|
def restart_unit_services():
|
|
'''Restart worker services.'''
|
|
hookenv.log('Restarting kubelet and kube-proxy.')
|
|
services = ['kube-proxy', 'kubelet']
|
|
for service in services:
|
|
service_restart('snap.%s.daemon' % service)
|
|
|
|
|
|
def get_kube_api_servers(kube_api):
|
|
'''Return the kubernetes api server address and port for this
|
|
relationship.'''
|
|
hosts = []
|
|
# Iterate over every service from the relation object.
|
|
for service in kube_api.services():
|
|
for unit in service['hosts']:
|
|
hosts.append('https://{0}:{1}'.format(unit['hostname'],
|
|
unit['port']))
|
|
return hosts
|
|
|
|
|
|
def kubectl(*args):
|
|
''' Run a kubectl cli command with a config file. Returns stdout and throws
|
|
an error if the command fails. '''
|
|
command = ['kubectl', '--kubeconfig=' + kubeclientconfig_path] + list(args)
|
|
hookenv.log('Executing {}'.format(command))
|
|
return check_output(command)
|
|
|
|
|
|
def kubectl_success(*args):
|
|
''' Runs kubectl with the given args. Returns True if successful, False if
|
|
not. '''
|
|
try:
|
|
kubectl(*args)
|
|
return True
|
|
except CalledProcessError:
|
|
return False
|
|
|
|
|
|
def kubectl_manifest(operation, manifest):
|
|
''' Wrap the kubectl creation command when using filepath resources
|
|
:param operation - one of get, create, delete, replace
|
|
:param manifest - filepath to the manifest
|
|
'''
|
|
# Deletions are a special case
|
|
if operation == 'delete':
|
|
# Ensure we immediately remove requested resources with --now
|
|
return kubectl_success(operation, '-f', manifest, '--now')
|
|
else:
|
|
# Guard against an error re-creating the same manifest multiple times
|
|
if operation == 'create':
|
|
# If we already have the definition, its probably safe to assume
|
|
# creation was true.
|
|
if kubectl_success('get', '-f', manifest):
|
|
hookenv.log('Skipping definition for {}'.format(manifest))
|
|
return True
|
|
# Execute the requested command that did not match any of the special
|
|
# cases above
|
|
return kubectl_success(operation, '-f', manifest)
|
|
|
|
|
|
@when('nrpe-external-master.available')
|
|
@when_not('nrpe-external-master.initial-config')
|
|
def initial_nrpe_config(nagios=None):
|
|
set_state('nrpe-external-master.initial-config')
|
|
update_nrpe_config(nagios)
|
|
|
|
|
|
@when('kubernetes-worker.config.created')
|
|
@when('nrpe-external-master.available')
|
|
@when_any('config.changed.nagios_context',
|
|
'config.changed.nagios_servicegroups')
|
|
def update_nrpe_config(unused=None):
|
|
services = ('snap.kubelet.daemon', 'snap.kube-proxy.daemon')
|
|
hostname = nrpe.get_nagios_hostname()
|
|
current_unit = nrpe.get_nagios_unit_name()
|
|
nrpe_setup = nrpe.NRPE(hostname=hostname)
|
|
nrpe.add_init_service_checks(nrpe_setup, services, current_unit)
|
|
nrpe_setup.write()
|
|
|
|
|
|
@when_not('nrpe-external-master.available')
|
|
@when('nrpe-external-master.initial-config')
|
|
def remove_nrpe_config(nagios=None):
|
|
remove_state('nrpe-external-master.initial-config')
|
|
|
|
# List of systemd services for which the checks will be removed
|
|
services = ('snap.kubelet.daemon', 'snap.kube-proxy.daemon')
|
|
|
|
# The current nrpe-external-master interface doesn't handle a lot of logic,
|
|
# use the charm-helpers code for now.
|
|
hostname = nrpe.get_nagios_hostname()
|
|
nrpe_setup = nrpe.NRPE(hostname=hostname)
|
|
|
|
for service in services:
|
|
nrpe_setup.remove_check(shortname=service)
|
|
|
|
|
|
def set_privileged():
|
|
"""Update the allow-privileged flag for kubelet.
|
|
|
|
"""
|
|
privileged = hookenv.config('allow-privileged').lower()
|
|
if privileged == 'auto':
|
|
gpu_enabled = is_state('kubernetes-worker.gpu.enabled')
|
|
privileged = 'true' if gpu_enabled else 'false'
|
|
|
|
if privileged == 'true':
|
|
set_state('kubernetes-worker.privileged')
|
|
else:
|
|
remove_state('kubernetes-worker.privileged')
|
|
|
|
|
|
@when('config.changed.allow-privileged')
|
|
@when('kubernetes-worker.config.created')
|
|
def on_config_allow_privileged_change():
|
|
"""React to changed 'allow-privileged' config value.
|
|
|
|
"""
|
|
set_state('kubernetes-worker.restart-needed')
|
|
remove_state('config.changed.allow-privileged')
|
|
|
|
|
|
@when('cuda.installed')
|
|
@when('kubernetes-worker.config.created')
|
|
@when_not('kubernetes-worker.gpu.enabled')
|
|
def enable_gpu():
|
|
"""Enable GPU usage on this node.
|
|
|
|
"""
|
|
config = hookenv.config()
|
|
if config['allow-privileged'] == "false":
|
|
hookenv.status_set(
|
|
'active',
|
|
'GPUs available. Set allow-privileged="auto" to enable.'
|
|
)
|
|
return
|
|
|
|
hookenv.log('Enabling gpu mode')
|
|
try:
|
|
# Not sure why this is necessary, but if you don't run this, k8s will
|
|
# think that the node has 0 gpus (as shown by the output of
|
|
# `kubectl get nodes -o yaml`
|
|
check_call(['nvidia-smi'])
|
|
except CalledProcessError as cpe:
|
|
hookenv.log('Unable to communicate with the NVIDIA driver.')
|
|
hookenv.log(cpe)
|
|
return
|
|
|
|
# Apply node labels
|
|
_apply_node_label('gpu=true', overwrite=True)
|
|
_apply_node_label('cuda=true', overwrite=True)
|
|
|
|
set_state('kubernetes-worker.gpu.enabled')
|
|
set_state('kubernetes-worker.restart-needed')
|
|
|
|
|
|
@when('kubernetes-worker.gpu.enabled')
|
|
@when_not('kubernetes-worker.privileged')
|
|
@when_not('kubernetes-worker.restart-needed')
|
|
def disable_gpu():
|
|
"""Disable GPU usage on this node.
|
|
|
|
This handler fires when we're running in gpu mode, and then the operator
|
|
sets allow-privileged="false". Since we can no longer run privileged
|
|
containers, we need to disable gpu mode.
|
|
|
|
"""
|
|
hookenv.log('Disabling gpu mode')
|
|
|
|
# Remove node labels
|
|
_apply_node_label('gpu', delete=True)
|
|
_apply_node_label('cuda', delete=True)
|
|
|
|
remove_state('kubernetes-worker.gpu.enabled')
|
|
set_state('kubernetes-worker.restart-needed')
|
|
|
|
|
|
@when('kubernetes-worker.gpu.enabled')
|
|
@when('kube-control.connected')
|
|
def notify_master_gpu_enabled(kube_control):
|
|
"""Notify kubernetes-master that we're gpu-enabled.
|
|
|
|
"""
|
|
kube_control.set_gpu(True)
|
|
|
|
|
|
@when_not('kubernetes-worker.gpu.enabled')
|
|
@when('kube-control.connected')
|
|
def notify_master_gpu_not_enabled(kube_control):
|
|
"""Notify kubernetes-master that we're not gpu-enabled.
|
|
|
|
"""
|
|
kube_control.set_gpu(False)
|
|
|
|
|
|
@when('kube-control.connected')
|
|
def request_kubelet_and_proxy_credentials(kube_control):
|
|
""" Request kubelet node authorization with a well formed kubelet user.
|
|
This also implies that we are requesting kube-proxy auth. """
|
|
|
|
# The kube-cotrol interface is created to support RBAC.
|
|
# At this point we might as well do the right thing and return the hostname
|
|
# even if it will only be used when we enable RBAC
|
|
nodeuser = 'system:node:{}'.format(gethostname().lower())
|
|
kube_control.set_auth_request(nodeuser)
|
|
|
|
|
|
@when('kube-control.connected')
|
|
def catch_change_in_creds(kube_control):
|
|
"""Request a service restart in case credential updates were detected."""
|
|
nodeuser = 'system:node:{}'.format(gethostname().lower())
|
|
creds = kube_control.get_auth_credentials(nodeuser)
|
|
if creds \
|
|
and data_changed('kube-control.creds', creds) \
|
|
and creds['user'] == nodeuser:
|
|
# We need to cache the credentials here because if the
|
|
# master changes (master leader dies and replaced by a new one)
|
|
# the new master will have no recollection of our certs.
|
|
db.set('credentials', creds)
|
|
set_state('worker.auth.bootstrapped')
|
|
set_state('kubernetes-worker.restart-needed')
|
|
|
|
|
|
@when_not('kube-control.connected')
|
|
def missing_kube_control():
|
|
"""Inform the operator they need to add the kube-control relation.
|
|
|
|
If deploying via bundle this won't happen, but if operator is upgrading a
|
|
a charm in a deployment that pre-dates the kube-control relation, it'll be
|
|
missing.
|
|
|
|
"""
|
|
hookenv.status_set(
|
|
'blocked',
|
|
'Relate {}:kube-control kubernetes-master:kube-control'.format(
|
|
hookenv.service_name()))
|
|
|
|
|
|
@when('docker.ready')
|
|
def fix_iptables_for_docker_1_13():
|
|
""" Fix iptables FORWARD policy for Docker >=1.13
|
|
https://github.com/kubernetes/kubernetes/issues/40182
|
|
https://github.com/kubernetes/kubernetes/issues/39823
|
|
"""
|
|
cmd = ['iptables', '-w', '300', '-P', 'FORWARD', 'ACCEPT']
|
|
check_call(cmd)
|
|
|
|
|
|
def _systemctl_is_active(application):
|
|
''' Poll systemctl to determine if the application is running '''
|
|
cmd = ['systemctl', 'is-active', application]
|
|
try:
|
|
raw = check_output(cmd)
|
|
return b'active' in raw
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
class GetNodeNameFailed(Exception):
|
|
pass
|
|
|
|
|
|
def get_node_name():
|
|
# Get all the nodes in the cluster
|
|
cmd = 'kubectl --kubeconfig={} get no -o=json'.format(kubeconfig_path)
|
|
cmd = cmd.split()
|
|
deadline = time.time() + 180
|
|
while time.time() < deadline:
|
|
try:
|
|
raw = check_output(cmd)
|
|
except CalledProcessError:
|
|
hookenv.log('Failed to get node name for node %s.'
|
|
' Will retry.' % (gethostname()))
|
|
time.sleep(1)
|
|
continue
|
|
|
|
result = json.loads(raw.decode('utf-8'))
|
|
if 'items' in result:
|
|
for node in result['items']:
|
|
if 'status' not in node:
|
|
continue
|
|
if 'addresses' not in node['status']:
|
|
continue
|
|
|
|
# find the hostname
|
|
for address in node['status']['addresses']:
|
|
if address['type'] == 'Hostname':
|
|
if address['address'] == gethostname():
|
|
return node['metadata']['name']
|
|
|
|
# if we didn't match, just bail to the next node
|
|
break
|
|
time.sleep(1)
|
|
|
|
msg = 'Failed to get node name for node %s' % gethostname()
|
|
raise GetNodeNameFailed(msg)
|
|
|
|
|
|
class ApplyNodeLabelFailed(Exception):
|
|
pass
|
|
|
|
|
|
def _apply_node_label(label, delete=False, overwrite=False):
|
|
''' Invoke kubectl to apply node label changes '''
|
|
nodename = get_node_name()
|
|
|
|
# TODO: Make this part of the kubectl calls instead of a special string
|
|
cmd_base = 'kubectl --kubeconfig={0} label node {1} {2}'
|
|
|
|
if delete is True:
|
|
label_key = label.split('=')[0]
|
|
cmd = cmd_base.format(kubeconfig_path, nodename, label_key)
|
|
cmd = cmd + '-'
|
|
else:
|
|
cmd = cmd_base.format(kubeconfig_path, nodename, label)
|
|
if overwrite:
|
|
cmd = '{} --overwrite'.format(cmd)
|
|
cmd = cmd.split()
|
|
|
|
deadline = time.time() + 180
|
|
while time.time() < deadline:
|
|
code = subprocess.call(cmd)
|
|
if code == 0:
|
|
break
|
|
hookenv.log('Failed to apply label %s, exit code %d. Will retry.' % (
|
|
label, code))
|
|
time.sleep(1)
|
|
else:
|
|
msg = 'Failed to apply label %s' % label
|
|
raise ApplyNodeLabelFailed(msg)
|
|
|
|
|
|
def _parse_labels(labels):
|
|
''' Parse labels from a key=value string separated by space.'''
|
|
label_array = labels.split(' ')
|
|
sanitized_labels = []
|
|
for item in label_array:
|
|
if '=' in item:
|
|
sanitized_labels.append(item)
|
|
else:
|
|
hookenv.log('Skipping malformed option: {}'.format(item))
|
|
return sanitized_labels
|