#!/usr/bin/env python # Copyright 2015 The Kubernetes Authors All rights reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """ The main hook file is called by Juju. """ import contextlib import os import socket import subprocess import sys from charmhelpers.core import hookenv, host from kubernetes_installer import KubernetesInstaller from path import path hooks = hookenv.Hooks() @contextlib.contextmanager def check_sentinel(filepath): """ A context manager method to write a file while the code block is doing something and remove the file when done. """ fail = False try: yield filepath.exists() except: fail = True filepath.touch() raise finally: if fail is False and filepath.exists(): filepath.remove() @hooks.hook('config-changed') def config_changed(): """ On the execution of the juju event 'config-changed' this function determines the appropriate architecture and the configured version to create kubernetes binary files. """ hookenv.log('Starting config-changed') charm_dir = path(hookenv.charm_dir()) config = hookenv.config() # Get the version of kubernetes to install. version = config['version'] if version == 'master': # The 'master' branch of kuberentes is used when master is configured. branch = 'master' elif version == 'local': # Check for kubernetes binaries in the local files/output directory. branch = None else: # Create a branch to a tag to get the release version. branch = 'tags/{0}'.format(version) # Get the package architecture, rather than arch from the kernel (uname -m). arch = subprocess.check_output(['dpkg', '--print-architecture']).strip() if not branch: output_path = charm_dir / 'files/output' installer = KubernetesInstaller(arch, version, output_path) else: # Build the kuberentes binaries from source on the units. kubernetes_dir = path('/opt/kubernetes') # Construct the path to the binaries using the arch. output_path = kubernetes_dir / '_output/local/bin/linux' / arch installer = KubernetesInstaller(arch, version, output_path) if not kubernetes_dir.exists(): print('The source directory {0} does not exist'.format(kubernetes_dir)) print('Was the kubernetes code cloned during install?') exit(1) # Change to the kubernetes directory (git repository). with kubernetes_dir: # Create a command to get the current branch. git_branch = 'git branch | grep "\*" | cut -d" " -f2' current_branch = subprocess.check_output(git_branch, shell=True).strip() print('Current branch: ', current_branch) # Create the path to a file to indicate if the build was broken. broken_build = charm_dir / '.broken_build' # write out the .broken_build file while this block is executing. with check_sentinel(broken_build) as last_build_failed: print('Last build failed: ', last_build_failed) # Rebuild if current version is different or last build failed. if current_branch != version or last_build_failed: installer.build(branch) if not output_path.isdir(): broken_build.touch() # Create the symoblic links to the right directories. installer.install() relation_changed() hookenv.log('The config-changed hook completed successfully.') @hooks.hook('etcd-relation-changed', 'minions-api-relation-changed') def relation_changed(): template_data = get_template_data() # Check required keys for k in ('etcd_servers',): if not template_data.get(k): print "Missing data for", k, template_data return print "Running with\n", template_data # Render and restart as needed for n in ('apiserver', 'controller-manager', 'scheduler'): if render_file(n, template_data) or not host.service_running(n): host.service_restart(n) # Render the file that makes the kubernetes binaries available to minions. if render_file( 'distribution', template_data, 'conf.tmpl', '/etc/nginx/sites-enabled/distribution') or \ not host.service_running('nginx'): host.service_reload('nginx') # Render the default nginx template. if render_file( 'nginx', template_data, 'conf.tmpl', '/etc/nginx/sites-enabled/default') or \ not host.service_running('nginx'): host.service_reload('nginx') # Send api endpoint to minions notify_minions() @hooks.hook('network-relation-changed') def network_relation_changed(): relation_id = hookenv.relation_id() hookenv.relation_set(relation_id, ignore_errors=True) def notify_minions(): print("Notify minions.") config = hookenv.config() for r in hookenv.relation_ids('minions-api'): hookenv.relation_set( r, hostname=hookenv.unit_private_ip(), port=8080, version=config['version']) print("Notified minions of version " + config['version']) def get_template_data(): rels = hookenv.relations() config = hookenv.config() version = config['version'] template_data = {} template_data['etcd_servers'] = ",".join([ "http://%s:%s" % (s[0], s[1]) for s in sorted( get_rel_hosts('etcd', rels, ('hostname', 'port')))]) template_data['minions'] = ",".join(get_rel_hosts('minions-api', rels)) template_data['api_bind_address'] = _bind_addr(hookenv.unit_private_ip()) template_data['bind_address'] = "127.0.0.1" template_data['api_server_address'] = "http://%s:%s" % ( hookenv.unit_private_ip(), 8080) arch = subprocess.check_output(['dpkg', '--print-architecture']).strip() template_data['web_uri'] = "/kubernetes/%s/local/bin/linux/%s/" % (version, arch) if version == 'local': template_data['alias'] = hookenv.charm_dir() + '/files/output/' else: directory = '/opt/kubernetes/_output/local/bin/linux/%s/' % arch template_data['alias'] = directory _encode(template_data) return template_data def _bind_addr(addr): if addr.replace('.', '').isdigit(): return addr try: return socket.gethostbyname(addr) except socket.error: raise ValueError("Could not resolve private address") def _encode(d): for k, v in d.items(): if isinstance(v, unicode): d[k] = v.encode('utf8') def get_rel_hosts(rel_name, rels, keys=('private-address',)): hosts = [] for r, data in rels.get(rel_name, {}).items(): for unit_id, unit_data in data.items(): if unit_id == hookenv.local_unit(): continue values = [unit_data.get(k) for k in keys] if not all(values): continue hosts.append(len(values) == 1 and values[0] or values) return hosts def render_file(name, data, src_suffix="upstart.tmpl", tgt_path=None): tmpl_path = os.path.join( os.environ.get('CHARM_DIR'), 'files', '%s.%s' % (name, src_suffix)) with open(tmpl_path) as fh: tmpl = fh.read() rendered = tmpl % data if tgt_path is None: tgt_path = '/etc/init/%s.conf' % name if os.path.exists(tgt_path): with open(tgt_path) as fh: contents = fh.read() if contents == rendered: return False with open(tgt_path, 'w') as fh: fh.write(rendered) return True if __name__ == '__main__': hooks.execute(sys.argv)