c87ac5ef2e
layer-nvidia-cuda does the hardware detection and sets a state that the worker can react to. When gpu is available, worker updates config and restarts kubelet to enable gpu mode. Worker then notifies master that it's in gpu mode via the kube-control relation. When master sees that a worker is in gpu mode, it updates to privileged mode and restarts kube-apiserver. The kube-control interface has subsumed the kube-dns interface functionality. An 'allow-privileged' config option has been added to both worker and master charms. The gpu enablement respects the value of this option; i.e., we can't enable gpu mode if the operator has set allow-privileged="false".
923 lines
34 KiB
Python
923 lines
34 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 base64
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import os
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import random
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import socket
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import string
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import json
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import charms.leadership
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from shlex import split
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from subprocess import call
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from subprocess import check_call
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from subprocess import check_output
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from subprocess import CalledProcessError
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from charms import layer
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from charms.reactive import hook
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from charms.reactive import remove_state
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from charms.reactive import set_state
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from charms.reactive import when, when_any, when_not
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from charms.reactive.helpers import data_changed
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from charms.kubernetes.common import get_version, reset_versions
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from charms.kubernetes.flagmanager import FlagManager
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from charmhelpers.core import hookenv
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from charmhelpers.core import host
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from charmhelpers.core import unitdata
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from charmhelpers.core.templating import render
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from charmhelpers.fetch import apt_install
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from charmhelpers.contrib.charmsupport import nrpe
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dashboard_templates = [
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'dashboard-controller.yaml',
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'dashboard-service.yaml',
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'influxdb-grafana-controller.yaml',
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'influxdb-service.yaml',
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'grafana-service.yaml',
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'heapster-controller.yaml',
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'heapster-service.yaml'
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]
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def service_cidr():
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''' Return the charm's service-cidr config '''
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db = unitdata.kv()
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frozen_cidr = db.get('kubernetes-master.service-cidr')
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return frozen_cidr or hookenv.config('service-cidr')
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def freeze_service_cidr():
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''' Freeze the service CIDR. Once the apiserver has started, we can no
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longer safely change this value. '''
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db = unitdata.kv()
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db.set('kubernetes-master.service-cidr', service_cidr())
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@hook('upgrade-charm')
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def reset_states_for_delivery():
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'''An upgrade charm event was triggered by Juju, react to that here.'''
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services = ['kube-apiserver',
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'kube-controller-manager',
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'kube-scheduler']
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for service in services:
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hookenv.log('Stopping {0} service.'.format(service))
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host.service_stop(service)
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remove_state('kubernetes-master.components.started')
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remove_state('kubernetes-master.components.installed')
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remove_state('kube-dns.available')
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remove_state('kubernetes.dashboard.available')
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@when_not('kubernetes-master.components.installed')
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def install():
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'''Unpack and put the Kubernetes master files on the path.'''
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# Get the resource via resource_get
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try:
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archive = hookenv.resource_get('kubernetes')
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except Exception:
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message = 'Error fetching the kubernetes 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 kubernetes resource.')
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hookenv.status_set('blocked', 'Missing kubernetes 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 kubernetes resource.')
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return
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hookenv.status_set('maintenance', 'Unpacking kubernetes resource.')
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files_dir = os.path.join(hookenv.charm_dir(), 'files')
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os.makedirs(files_dir, exist_ok=True)
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command = 'tar -xvzf {0} -C {1}'.format(archive, files_dir)
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hookenv.log(command)
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check_call(split(command))
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apps = [
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{'name': 'kube-apiserver', 'path': '/usr/local/bin'},
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{'name': 'kube-controller-manager', 'path': '/usr/local/bin'},
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{'name': 'kube-scheduler', 'path': '/usr/local/bin'},
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{'name': 'kubectl', 'path': '/usr/local/bin'},
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]
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for app in apps:
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unpacked = '{}/{}'.format(files_dir, 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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reset_versions()
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set_state('kubernetes-master.components.installed')
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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 master configuration on the CNI relation. This lets the CNI
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subordinate know that we're the master so it can respond accordingly. '''
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cni.set_config(is_master=True, kubeconfig_path='')
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@when('leadership.is_leader')
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@when('kubernetes-master.components.installed')
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@when_not('authentication.setup')
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def setup_leader_authentication():
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'''Setup basic authentication and token access for the cluster.'''
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api_opts = FlagManager('kube-apiserver')
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controller_opts = FlagManager('kube-controller-manager')
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service_key = '/etc/kubernetes/serviceaccount.key'
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basic_auth = '/srv/kubernetes/basic_auth.csv'
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known_tokens = '/srv/kubernetes/known_tokens.csv'
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api_opts.add('--basic-auth-file', basic_auth)
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api_opts.add('--token-auth-file', known_tokens)
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api_opts.add('--service-cluster-ip-range', service_cidr())
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hookenv.status_set('maintenance', 'Rendering authentication templates.')
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if not os.path.isfile(basic_auth):
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setup_basic_auth('admin', 'admin', 'admin')
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if not os.path.isfile(known_tokens):
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setup_tokens(None, 'admin', 'admin')
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setup_tokens(None, 'kubelet', 'kubelet')
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setup_tokens(None, 'kube_proxy', 'kube_proxy')
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# Generate the default service account token key
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os.makedirs('/etc/kubernetes', exist_ok=True)
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cmd = ['openssl', 'genrsa', '-out', service_key,
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'2048']
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check_call(cmd)
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api_opts.add('--service-account-key-file', service_key)
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controller_opts.add('--service-account-private-key-file', service_key)
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# read service account key for syndication
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leader_data = {}
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for f in [known_tokens, basic_auth, service_key]:
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with open(f, 'r') as fp:
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leader_data[f] = fp.read()
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# this is slightly opaque, but we are sending file contents under its file
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# path as a key.
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# eg:
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# {'/etc/kubernetes/serviceaccount.key': 'RSA:2471731...'}
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charms.leadership.leader_set(leader_data)
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set_state('authentication.setup')
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@when_not('leadership.is_leader')
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@when('kubernetes-master.components.installed')
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@when_not('authentication.setup')
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def setup_non_leader_authentication():
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api_opts = FlagManager('kube-apiserver')
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controller_opts = FlagManager('kube-controller-manager')
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service_key = '/etc/kubernetes/serviceaccount.key'
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basic_auth = '/srv/kubernetes/basic_auth.csv'
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known_tokens = '/srv/kubernetes/known_tokens.csv'
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# This races with other codepaths, and seems to require being created first
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# This block may be extracted later, but for now seems to work as intended
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os.makedirs('/etc/kubernetes', exist_ok=True)
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os.makedirs('/srv/kubernetes', exist_ok=True)
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hookenv.status_set('maintenance', 'Rendering authentication templates.')
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# Set an array for looping logic
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keys = [service_key, basic_auth, known_tokens]
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for k in keys:
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# If the path does not exist, assume we need it
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if not os.path.exists(k):
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# Fetch data from leadership broadcast
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contents = charms.leadership.leader_get(k)
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# Default to logging the warning and wait for leader data to be set
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if contents is None:
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msg = "Waiting on leaders crypto keys."
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hookenv.status_set('waiting', msg)
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hookenv.log('Missing content for file {}'.format(k))
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return
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# Write out the file and move on to the next item
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with open(k, 'w+') as fp:
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fp.write(contents)
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api_opts.add('--basic-auth-file', basic_auth)
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api_opts.add('--token-auth-file', known_tokens)
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api_opts.add('--service-cluster-ip-range', service_cidr())
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api_opts.add('--service-account-key-file', service_key)
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controller_opts.add('--service-account-private-key-file', service_key)
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set_state('authentication.setup')
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@when('kubernetes-master.components.installed')
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def set_app_version():
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''' Declare the application version to juju '''
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version = check_output(['kube-apiserver', '--version'])
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hookenv.application_version_set(version.split(b' v')[-1].rstrip())
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@when('kube-dns.available', 'kubernetes-master.components.installed')
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def idle_status():
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''' Signal at the end of the run that we are running. '''
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if not all_kube_system_pods_running():
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hookenv.status_set('waiting', 'Waiting for kube-system pods to start')
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elif hookenv.config('service-cidr') != service_cidr():
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msg = 'WARN: cannot change service-cidr, still using ' + service_cidr()
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hookenv.status_set('active', msg)
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else:
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hookenv.status_set('active', 'Kubernetes master running.')
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@when('etcd.available', 'kubernetes-master.components.installed',
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'certificates.server.cert.available', 'authentication.setup')
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@when_not('kubernetes-master.components.started')
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def start_master(etcd, tls):
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'''Run the Kubernetes master components.'''
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hookenv.status_set('maintenance',
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'Rendering the Kubernetes master systemd files.')
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freeze_service_cidr()
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handle_etcd_relation(etcd)
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# Use the etcd relation object to render files with etcd information.
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render_files()
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hookenv.status_set('maintenance',
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'Starting the Kubernetes master services.')
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services = ['kube-apiserver',
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'kube-controller-manager',
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'kube-scheduler']
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for service in services:
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hookenv.log('Starting {0} service.'.format(service))
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host.service_start(service)
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hookenv.open_port(6443)
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set_state('kubernetes-master.components.started')
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@when('kube-control.connected')
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def send_cluster_dns_detail(kube_control):
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''' Send cluster DNS info '''
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# Note that the DNS server doesn't necessarily exist at this point. We know
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# where we're going to put it, though, so let's send the info anyway.
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dns_ip = get_dns_ip()
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kube_control.set_dns(53, hookenv.config('dns_domain'), dns_ip)
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@when_not('kube-control.connected')
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def missing_kube_control():
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"""Inform the operator they need to add the kube-control relation.
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If deploying via bundle this won't happen, but if operator is upgrading a
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a charm in a deployment that pre-dates the kube-control relation, it'll be
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missing.
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"""
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hookenv.status_set(
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'blocked',
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'Relate {}:kube-control kubernetes-worker:kube-control'.format(
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hookenv.service_name()))
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@when('kube-api-endpoint.available')
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def push_service_data(kube_api):
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''' Send configuration to the load balancer, and close access to the
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public interface '''
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kube_api.configure(port=6443)
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@when('certificates.available')
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def send_data(tls):
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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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# Get the SDN gateway based on the cidr address.
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kubernetes_service_ip = get_kubernetes_service_ip()
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domain = hookenv.config('dns_domain')
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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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hookenv.unit_private_ip(),
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socket.gethostname(),
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kubernetes_service_ip,
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'kubernetes',
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'kubernetes.{0}'.format(domain),
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'kubernetes.default',
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'kubernetes.default.svc',
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'kubernetes.default.svc.{0}'.format(domain)
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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.connected')
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def push_api_data(kube_api):
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''' Send configuration to remote consumer.'''
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# Since all relations already have the private ip address, only
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# send the port on the relation object to all consumers.
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# The kubernetes api-server uses 6443 for the default secure port.
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kube_api.set_api_port('6443')
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@when('kubernetes-master.components.started', 'kube-dns.available')
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@when_not('kubernetes.dashboard.available')
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def install_dashboard_addons():
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''' Launch dashboard addons if they are enabled in config '''
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if hookenv.config('enable-dashboard-addons'):
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hookenv.log('Launching kubernetes dashboard.')
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context = {}
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context['arch'] = arch()
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try:
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context['pillar'] = {'num_nodes': get_node_count()}
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for template in dashboard_templates:
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create_addon(template, context)
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set_state('kubernetes.dashboard.available')
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except CalledProcessError:
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hookenv.log('Kubernetes dashboard waiting on kubeapi')
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@when('kubernetes-master.components.started', 'kubernetes.dashboard.available')
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def remove_dashboard_addons():
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''' Removes dashboard addons if they are disabled in config '''
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if not hookenv.config('enable-dashboard-addons'):
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hookenv.log('Removing kubernetes dashboard.')
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for template in dashboard_templates:
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delete_addon(template)
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remove_state('kubernetes.dashboard.available')
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@when('kubernetes-master.components.started')
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@when_not('kube-dns.available')
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def start_kube_dns():
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''' State guard to starting DNS '''
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hookenv.status_set('maintenance', 'Deploying KubeDNS')
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context = {
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'arch': arch(),
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# The dictionary named 'pillar' is a construct of the k8s template file
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'pillar': {
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'dns_server': get_dns_ip(),
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'dns_replicas': 1,
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'dns_domain': hookenv.config('dns_domain')
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}
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}
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try:
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create_addon('kubedns-sa.yaml', context)
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create_addon('kubedns-cm.yaml', context)
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create_addon('kubedns-controller.yaml', context)
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create_addon('kubedns-svc.yaml', context)
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except CalledProcessError:
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hookenv.status_set('waiting', 'Waiting to retry KubeDNS deployment')
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return
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set_state('kube-dns.available')
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|
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@when('kubernetes-master.components.installed', 'loadbalancer.available',
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'certificates.ca.available', 'certificates.client.cert.available')
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def loadbalancer_kubeconfig(loadbalancer, ca, client):
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# Get the potential list of loadbalancers from the relation object.
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hosts = loadbalancer.get_addresses_ports()
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# Get the public address of loadbalancers so users can access the cluster.
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address = hosts[0].get('public-address')
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# Get the port of the loadbalancer so users can access the cluster.
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port = hosts[0].get('port')
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server = 'https://{0}:{1}'.format(address, port)
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build_kubeconfig(server)
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|
|
|
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@when('kubernetes-master.components.installed',
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'certificates.ca.available', 'certificates.client.cert.available')
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@when_not('loadbalancer.available')
|
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def create_self_config(ca, client):
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'''Create a kubernetes configuration for the master unit.'''
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server = 'https://{0}:{1}'.format(hookenv.unit_get('public-address'), 6443)
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build_kubeconfig(server)
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|
|
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@when('ceph-storage.available')
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def ceph_state_control(ceph_admin):
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|
''' Determine if we should remove the state that controls the re-render
|
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and execution of the ceph-relation-changed event because there
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are changes in the relationship data, and we should re-render any
|
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configs, keys, and/or service pre-reqs '''
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|
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ceph_relation_data = {
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'mon_hosts': ceph_admin.mon_hosts(),
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'fsid': ceph_admin.fsid(),
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'auth_supported': ceph_admin.auth(),
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'hostname': socket.gethostname(),
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'key': ceph_admin.key()
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}
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|
|
# Re-execute the rendering if the data has changed.
|
|
if data_changed('ceph-config', ceph_relation_data):
|
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remove_state('ceph-storage.configured')
|
|
|
|
|
|
@when('ceph-storage.available')
|
|
@when_not('ceph-storage.configured')
|
|
def ceph_storage(ceph_admin):
|
|
'''Ceph on kubernetes will require a few things - namely a ceph
|
|
configuration, and the ceph secret key file used for authentication.
|
|
This method will install the client package, and render the requisit files
|
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in order to consume the ceph-storage relation.'''
|
|
ceph_context = {
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'mon_hosts': ceph_admin.mon_hosts(),
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'fsid': ceph_admin.fsid(),
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'auth_supported': ceph_admin.auth(),
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'use_syslog': "true",
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'ceph_public_network': '',
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'ceph_cluster_network': '',
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'loglevel': 1,
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'hostname': socket.gethostname(),
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}
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# Install the ceph common utilities.
|
|
apt_install(['ceph-common'], fatal=True)
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|
|
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etc_ceph_directory = '/etc/ceph'
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if not os.path.isdir(etc_ceph_directory):
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os.makedirs(etc_ceph_directory)
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charm_ceph_conf = os.path.join(etc_ceph_directory, 'ceph.conf')
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# Render the ceph configuration from the ceph conf template
|
|
render('ceph.conf', charm_ceph_conf, ceph_context)
|
|
|
|
# The key can rotate independently of other ceph config, so validate it
|
|
admin_key = os.path.join(etc_ceph_directory,
|
|
'ceph.client.admin.keyring')
|
|
try:
|
|
with open(admin_key, 'w') as key_file:
|
|
key_file.write("[client.admin]\n\tkey = {}\n".format(
|
|
ceph_admin.key()))
|
|
except IOError as err:
|
|
hookenv.log("IOError writing admin.keyring: {}".format(err))
|
|
|
|
# Enlist the ceph-admin key as a kubernetes secret
|
|
if ceph_admin.key():
|
|
encoded_key = base64.b64encode(ceph_admin.key().encode('utf-8'))
|
|
else:
|
|
# We didn't have a key, and cannot proceed. Do not set state and
|
|
# allow this method to re-execute
|
|
return
|
|
|
|
context = {'secret': encoded_key.decode('ascii')}
|
|
render('ceph-secret.yaml', '/tmp/ceph-secret.yaml', context)
|
|
try:
|
|
# At first glance this is deceptive. The apply stanza will create if
|
|
# it doesn't exist, otherwise it will update the entry, ensuring our
|
|
# ceph-secret is always reflective of what we have in /etc/ceph
|
|
# assuming we have invoked this anytime that file would change.
|
|
cmd = ['kubectl', 'apply', '-f', '/tmp/ceph-secret.yaml']
|
|
check_call(cmd)
|
|
os.remove('/tmp/ceph-secret.yaml')
|
|
except:
|
|
# the enlistment in kubernetes failed, return and prepare for re-exec
|
|
return
|
|
|
|
# when complete, set a state relating to configuration of the storage
|
|
# backend that will allow other modules to hook into this and verify we
|
|
# have performed the necessary pre-req steps to interface with a ceph
|
|
# deployment.
|
|
set_state('ceph-storage.configured')
|
|
|
|
|
|
@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-master.components.started')
|
|
@when('nrpe-external-master.available')
|
|
@when_any('config.changed.nagios_context',
|
|
'config.changed.nagios_servicegroups')
|
|
def update_nrpe_config(unused=None):
|
|
services = ('kube-apiserver', 'kube-controller-manager', 'kube-scheduler')
|
|
|
|
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 = ('kube-apiserver', 'kube-controller-manager', 'kube-scheduler')
|
|
|
|
# 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(privileged, render_config=True):
|
|
"""Update the KUBE_ALLOW_PRIV flag for kube-apiserver and re-render config.
|
|
|
|
If the flag already matches the requested value, this is a no-op.
|
|
|
|
:param str privileged: "true" or "false"
|
|
:param bool render_config: whether to render new config file
|
|
:return: True if the flag was changed, else false
|
|
|
|
"""
|
|
if privileged == "true":
|
|
set_state('kubernetes-master.privileged')
|
|
else:
|
|
remove_state('kubernetes-master.privileged')
|
|
|
|
flag = '--allow-privileged'
|
|
kube_allow_priv_opts = FlagManager('KUBE_ALLOW_PRIV')
|
|
if kube_allow_priv_opts.get(flag) == privileged:
|
|
# Flag isn't changing, nothing to do
|
|
return False
|
|
|
|
hookenv.log('Setting {}={}'.format(flag, privileged))
|
|
|
|
# Update --allow-privileged flag value
|
|
kube_allow_priv_opts.add(flag, privileged, strict=True)
|
|
|
|
# re-render config with new options
|
|
if render_config:
|
|
context = {
|
|
'kube_allow_priv': kube_allow_priv_opts.to_s(),
|
|
}
|
|
|
|
# render the kube-defaults file
|
|
render('kube-defaults.defaults', '/etc/default/kube-defaults', context)
|
|
|
|
# signal that we need a kube-apiserver restart
|
|
set_state('kubernetes-master.kube-apiserver.restart')
|
|
|
|
return True
|
|
|
|
|
|
@when('config.changed.allow-privileged')
|
|
@when('kubernetes-master.components.started')
|
|
def on_config_allow_privileged_change():
|
|
"""React to changed 'allow-privileged' config value.
|
|
|
|
"""
|
|
config = hookenv.config()
|
|
privileged = config['allow-privileged']
|
|
if privileged == "auto":
|
|
return
|
|
|
|
set_privileged(privileged)
|
|
remove_state('config.changed.allow-privileged')
|
|
|
|
|
|
@when('kubernetes-master.kube-apiserver.restart')
|
|
def restart_kube_apiserver():
|
|
"""Restart kube-apiserver.
|
|
|
|
"""
|
|
host.service_restart('kube-apiserver')
|
|
remove_state('kubernetes-master.kube-apiserver.restart')
|
|
|
|
|
|
@when('kube-control.gpu.available')
|
|
@when('kubernetes-master.components.started')
|
|
@when_not('kubernetes-master.gpu.enabled')
|
|
def on_gpu_available(kube_control):
|
|
"""The remote side (kubernetes-worker) is gpu-enabled.
|
|
|
|
We need to run in privileged mode.
|
|
|
|
"""
|
|
config = hookenv.config()
|
|
if config['allow-privileged'] == "false":
|
|
hookenv.status_set(
|
|
'active',
|
|
'GPUs available. Set allow-privileged="auto" to enable.'
|
|
)
|
|
return
|
|
|
|
set_privileged("true")
|
|
set_state('kubernetes-master.gpu.enabled')
|
|
|
|
|
|
@when('kubernetes-master.gpu.enabled')
|
|
@when_not('kubernetes-master.privileged')
|
|
def disable_gpu_mode():
|
|
"""We were in gpu mode, but the operator has set allow-privileged="false",
|
|
so we can't run in gpu mode anymore.
|
|
|
|
"""
|
|
remove_state('kubernetes-master.gpu.enabled')
|
|
|
|
|
|
def create_addon(template, context):
|
|
'''Create an addon from a template'''
|
|
source = 'addons/' + template
|
|
target = '/etc/kubernetes/addons/' + template
|
|
render(source, target, context)
|
|
# Need --force when upgrading between k8s versions where the templates have
|
|
# changed.
|
|
cmd = ['kubectl', 'apply', '--force', '-f', target]
|
|
check_call(cmd)
|
|
|
|
|
|
def delete_addon(template):
|
|
'''Delete an addon from a template'''
|
|
target = '/etc/kubernetes/addons/' + template
|
|
cmd = ['kubectl', 'delete', '-f', target]
|
|
call(cmd)
|
|
|
|
|
|
def get_node_count():
|
|
'''Return the number of Kubernetes nodes in the cluster'''
|
|
cmd = ['kubectl', 'get', 'nodes', '-o', 'name']
|
|
output = check_output(cmd)
|
|
node_count = len(output.splitlines())
|
|
return node_count
|
|
|
|
|
|
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 build_kubeconfig(server):
|
|
'''Gather the relevant data for Kubernetes configuration objects and create
|
|
a config object with that information.'''
|
|
# 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')
|
|
ca_exists = ca and os.path.isfile(ca)
|
|
key = layer_options.get('client_key_path')
|
|
key_exists = key and os.path.isfile(key)
|
|
cert = layer_options.get('client_certificate_path')
|
|
cert_exists = cert and os.path.isfile(cert)
|
|
# Do we have everything we need?
|
|
if ca_exists and key_exists and cert_exists:
|
|
# Cache last server string to know if we need to regenerate the config.
|
|
if not data_changed('kubeconfig.server', server):
|
|
return
|
|
# The final destination of the kubeconfig and kubectl.
|
|
destination_directory = '/home/ubuntu'
|
|
# Create an absolute path for the kubeconfig file.
|
|
kubeconfig_path = os.path.join(destination_directory, 'config')
|
|
# Create the kubeconfig on this system so users can access the cluster.
|
|
create_kubeconfig(kubeconfig_path, server, ca, key, cert)
|
|
# Copy the kubectl binary to the destination directory.
|
|
cmd = ['install', '-v', '-o', 'ubuntu', '-g', 'ubuntu',
|
|
'/usr/local/bin/kubectl', destination_directory]
|
|
check_call(cmd)
|
|
# Make the config file readable by the ubuntu users so juju scp works.
|
|
cmd = ['chown', 'ubuntu:ubuntu', kubeconfig_path]
|
|
check_call(cmd)
|
|
|
|
|
|
def create_kubeconfig(kubeconfig, server, ca, key, certificate, user='ubuntu',
|
|
context='juju-context', cluster='juju-cluster'):
|
|
'''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.'''
|
|
# 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)))
|
|
# Create the credentials using the client flags.
|
|
cmd = 'kubectl config --kubeconfig={0} set-credentials {1} ' \
|
|
'--client-key={2} --client-certificate={3} --embed-certs=true'
|
|
check_call(split(cmd.format(kubeconfig, user, key, certificate)))
|
|
# 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)))
|
|
|
|
|
|
def get_dns_ip():
|
|
'''Get an IP address for the DNS server on the provided cidr.'''
|
|
# Remove the range from the cidr.
|
|
ip = service_cidr().split('/')[0]
|
|
# Take the last octet off the IP address and replace it with 10.
|
|
return '.'.join(ip.split('.')[0:-1]) + '.10'
|
|
|
|
|
|
def get_kubernetes_service_ip():
|
|
'''Get the IP address for the kubernetes service based on the cidr.'''
|
|
# Remove the range from the cidr.
|
|
ip = service_cidr().split('/')[0]
|
|
# Remove the last octet and replace it with 1.
|
|
return '.'.join(ip.split('.')[0:-1]) + '.1'
|
|
|
|
|
|
def handle_etcd_relation(reldata):
|
|
''' Save the client credentials and set appropriate daemon flags when
|
|
etcd declares itself as available'''
|
|
connection_string = reldata.get_connection_string()
|
|
# Define where the etcd tls files will be kept.
|
|
etcd_dir = '/etc/ssl/etcd'
|
|
# Create paths to the etcd client ca, key, and cert file locations.
|
|
ca = os.path.join(etcd_dir, 'client-ca.pem')
|
|
key = os.path.join(etcd_dir, 'client-key.pem')
|
|
cert = os.path.join(etcd_dir, 'client-cert.pem')
|
|
|
|
# Save the client credentials (in relation data) to the paths provided.
|
|
reldata.save_client_credentials(key, cert, ca)
|
|
|
|
api_opts = FlagManager('kube-apiserver')
|
|
|
|
# Never use stale data, always prefer whats coming in during context
|
|
# building. if its stale, its because whats in unitdata is stale
|
|
data = api_opts.data
|
|
if data.get('--etcd-servers-strict') or data.get('--etcd-servers'):
|
|
api_opts.destroy('--etcd-cafile')
|
|
api_opts.destroy('--etcd-keyfile')
|
|
api_opts.destroy('--etcd-certfile')
|
|
api_opts.destroy('--etcd-servers', strict=True)
|
|
api_opts.destroy('--etcd-servers')
|
|
|
|
# Set the apiserver flags in the options manager
|
|
api_opts.add('--etcd-cafile', ca)
|
|
api_opts.add('--etcd-keyfile', key)
|
|
api_opts.add('--etcd-certfile', cert)
|
|
api_opts.add('--etcd-servers', connection_string, strict=True)
|
|
|
|
|
|
def render_files():
|
|
'''Use jinja templating to render the docker-compose.yml and master.json
|
|
file to contain the dynamic data for the configuration files.'''
|
|
context = {}
|
|
config = hookenv.config()
|
|
# Add the charm configuration data to the context.
|
|
context.update(config)
|
|
|
|
# Update the context with extra values: arch, and networking information
|
|
context.update({'arch': arch(),
|
|
'master_address': hookenv.unit_get('private-address'),
|
|
'public_address': hookenv.unit_get('public-address'),
|
|
'private_address': hookenv.unit_get('private-address')})
|
|
|
|
api_opts = FlagManager('kube-apiserver')
|
|
controller_opts = FlagManager('kube-controller-manager')
|
|
scheduler_opts = FlagManager('kube-scheduler')
|
|
scheduler_opts.add('--v', '2')
|
|
|
|
# Get the tls paths from the layer data.
|
|
layer_options = layer.options('tls-client')
|
|
ca_cert_path = layer_options.get('ca_certificate_path')
|
|
client_cert_path = layer_options.get('client_certificate_path')
|
|
client_key_path = layer_options.get('client_key_path')
|
|
server_cert_path = layer_options.get('server_certificate_path')
|
|
server_key_path = layer_options.get('server_key_path')
|
|
|
|
# set --allow-privileged flag for kube-apiserver
|
|
set_privileged(
|
|
"true" if config['allow-privileged'] == "true" else "false",
|
|
render_config=False)
|
|
|
|
# Handle static options for now
|
|
api_opts.add('--min-request-timeout', '300')
|
|
api_opts.add('--v', '4')
|
|
api_opts.add('--client-ca-file', ca_cert_path)
|
|
api_opts.add('--tls-cert-file', server_cert_path)
|
|
api_opts.add('--tls-private-key-file', server_key_path)
|
|
api_opts.add('--kubelet-certificate-authority', ca_cert_path)
|
|
api_opts.add('--kubelet-client-certificate', client_cert_path)
|
|
api_opts.add('--kubelet-client-key', client_key_path)
|
|
# Needed for upgrade from 1.5.x to 1.6.0
|
|
# XXX: support etcd3
|
|
api_opts.add('--storage-backend', 'etcd2')
|
|
admission_control = [
|
|
'NamespaceLifecycle',
|
|
'LimitRanger',
|
|
'ServiceAccount',
|
|
'ResourceQuota',
|
|
'DefaultTolerationSeconds'
|
|
]
|
|
if get_version('kube-apiserver') < (1, 6):
|
|
hookenv.log('Removing DefaultTolerationSeconds from admission-control')
|
|
admission_control.remove('DefaultTolerationSeconds')
|
|
api_opts.add(
|
|
'--admission-control', ','.join(admission_control), strict=True)
|
|
|
|
# Default to 3 minute resync. TODO: Make this configureable?
|
|
controller_opts.add('--min-resync-period', '3m')
|
|
controller_opts.add('--v', '2')
|
|
controller_opts.add('--root-ca-file', ca_cert_path)
|
|
|
|
context.update({
|
|
'kube_allow_priv': FlagManager('KUBE_ALLOW_PRIV').to_s(),
|
|
'kube_apiserver_flags': api_opts.to_s(),
|
|
'kube_scheduler_flags': scheduler_opts.to_s(),
|
|
'kube_controller_manager_flags': controller_opts.to_s(),
|
|
})
|
|
|
|
# Render the configuration files that contains parameters for
|
|
# the apiserver, scheduler, and controller-manager
|
|
render_service('kube-apiserver', context)
|
|
render_service('kube-controller-manager', context)
|
|
render_service('kube-scheduler', context)
|
|
|
|
# explicitly render the generic defaults file
|
|
render('kube-defaults.defaults', '/etc/default/kube-defaults', context)
|
|
|
|
# when files change on disk, we need to inform systemd of the changes
|
|
call(['systemctl', 'daemon-reload'])
|
|
call(['systemctl', 'enable', 'kube-apiserver'])
|
|
call(['systemctl', 'enable', 'kube-controller-manager'])
|
|
call(['systemctl', 'enable', 'kube-scheduler'])
|
|
|
|
|
|
def render_service(service_name, context):
|
|
'''Render the systemd service by name.'''
|
|
unit_directory = '/lib/systemd/system'
|
|
source = '{0}.service'.format(service_name)
|
|
target = os.path.join(unit_directory, '{0}.service'.format(service_name))
|
|
render(source, target, context)
|
|
conf_directory = '/etc/default'
|
|
source = '{0}.defaults'.format(service_name)
|
|
target = os.path.join(conf_directory, service_name)
|
|
render(source, target, context)
|
|
|
|
|
|
def setup_basic_auth(username='admin', password='admin', user='admin'):
|
|
'''Create the htacces file and the tokens.'''
|
|
srv_kubernetes = '/srv/kubernetes'
|
|
if not os.path.isdir(srv_kubernetes):
|
|
os.makedirs(srv_kubernetes)
|
|
htaccess = os.path.join(srv_kubernetes, 'basic_auth.csv')
|
|
with open(htaccess, 'w') as stream:
|
|
stream.write('{0},{1},{2}'.format(username, password, user))
|
|
|
|
|
|
def setup_tokens(token, username, user):
|
|
'''Create a token file for kubernetes authentication.'''
|
|
srv_kubernetes = '/srv/kubernetes'
|
|
if not os.path.isdir(srv_kubernetes):
|
|
os.makedirs(srv_kubernetes)
|
|
known_tokens = os.path.join(srv_kubernetes, 'known_tokens.csv')
|
|
if not token:
|
|
alpha = string.ascii_letters + string.digits
|
|
token = ''.join(random.SystemRandom().choice(alpha) for _ in range(32))
|
|
with open(known_tokens, 'w') as stream:
|
|
stream.write('{0},{1},{2}'.format(token, username, user))
|
|
|
|
|
|
def all_kube_system_pods_running():
|
|
''' Check pod status in the kube-system namespace. Returns True if all
|
|
pods are running, False otherwise. '''
|
|
cmd = ['kubectl', 'get', 'po', '-n', 'kube-system', '-o', 'json']
|
|
|
|
try:
|
|
output = check_output(cmd).decode('utf-8')
|
|
except CalledProcessError:
|
|
hookenv.log('failed to get kube-system pod status')
|
|
return False
|
|
|
|
result = json.loads(output)
|
|
|
|
for pod in result['items']:
|
|
status = pod['status']['phase']
|
|
if status != 'Running':
|
|
return False
|
|
|
|
return True
|