Example #1
0
// StateWorker returns a worker running all the workers that require
// a *state.State connection.
func (a *MachineAgent) StateWorker() (worker.Worker, error) {
	agentConfig := a.CurrentConfig()

	// Create system-identity file
	if err := agent.WriteSystemIdentityFile(agentConfig); err != nil {
		return nil, err
	}

	// Start MondoDB server
	if err := a.ensureMongoServer(agentConfig); err != nil {
		return nil, err
	}
	st, m, err := openState(agentConfig)
	if err != nil {
		return nil, err
	}
	reportOpenedState(st)

	singularStateConn := singularStateConn{st.MongoSession(), m}
	runner := newRunner(connectionIsFatal(st), moreImportant)
	singularRunner, err := newSingularRunner(runner, singularStateConn)
	if err != nil {
		return nil, fmt.Errorf("cannot make singular State Runner: %v", err)
	}

	// Take advantage of special knowledge here in that we will only ever want
	// the storage provider on one machine, and that is the "bootstrap" node.
	providerType := agentConfig.Value(agent.ProviderType)
	if (providerType == provider.Local || provider.IsManual(providerType)) && m.Id() == bootstrapMachineId {
		a.startWorkerAfterUpgrade(runner, "local-storage", func() (worker.Worker, error) {
			// TODO(axw) 2013-09-24 bug #1229507
			// Make another job to enable storage.
			// There's nothing special about this.
			return localstorage.NewWorker(agentConfig), nil
		})
	}
	for _, job := range m.Jobs() {
		switch job {
		case state.JobHostUnits:
			// Implemented in APIWorker.
		case state.JobManageEnviron:
			useMultipleCPUs()
			a.startWorkerAfterUpgrade(runner, "instancepoller", func() (worker.Worker, error) {
				return instancepoller.NewWorker(st), nil
			})
			runner.StartWorker("peergrouper", func() (worker.Worker, error) {
				return peergrouperNew(st)
			})
			runner.StartWorker("apiserver", func() (worker.Worker, error) {
				// If the configuration does not have the required information,
				// it is currently not a recoverable error, so we kill the whole
				// agent, potentially enabling human intervention to fix
				// the agent's configuration file. In the future, we may retrieve
				// the state server certificate and key from the state, and
				// this should then change.
				info, ok := agentConfig.StateServingInfo()
				if !ok {
					return nil, &fatalError{"StateServingInfo not available and we need it"}
				}
				port := info.APIPort
				cert := []byte(info.Cert)
				key := []byte(info.PrivateKey)

				if len(cert) == 0 || len(key) == 0 {
					return nil, &fatalError{"configuration does not have state server cert/key"}
				}
				dataDir := agentConfig.DataDir()
				logDir := agentConfig.LogDir()
				return apiserver.NewServer(
					st, fmt.Sprintf(":%d", port), cert, key, dataDir, logDir)
			})
			a.startWorkerAfterUpgrade(singularRunner, "cleaner", func() (worker.Worker, error) {
				return cleaner.NewCleaner(st), nil
			})
			a.startWorkerAfterUpgrade(singularRunner, "resumer", func() (worker.Worker, error) {
				// The action of resumer is so subtle that it is not tested,
				// because we can't figure out how to do so without brutalising
				// the transaction log.
				return resumer.NewResumer(st), nil
			})
			a.startWorkerAfterUpgrade(singularRunner, "minunitsworker", func() (worker.Worker, error) {
				return minunitsworker.NewMinUnitsWorker(st), nil
			})
		case state.JobManageStateDeprecated:
			// Legacy environments may set this, but we ignore it.
		default:
			logger.Warningf("ignoring unknown job %q", job)
		}
	}
	return newCloseWorker(runner, st), nil
}
Example #2
0
// Run initializes state for an environment.
func (c *BootstrapCommand) Run(_ *cmd.Context) error {
	envCfg, err := config.New(config.NoDefaults, c.EnvConfig)
	if err != nil {
		return err
	}
	err = c.ReadConfig("machine-0")
	if err != nil {
		return err
	}
	agentConfig := c.CurrentConfig()

	// agent.Jobs is an optional field in the agent config, and was
	// introduced after 1.17.2. We default to allowing units on
	// machine-0 if missing.
	jobs := agentConfig.Jobs()
	if len(jobs) == 0 {
		jobs = []params.MachineJob{
			params.JobManageEnviron,
			params.JobHostUnits,
		}
	}

	// Get the bootstrap machine's addresses from the provider.
	env, err := environs.New(envCfg)
	if err != nil {
		return err
	}
	instanceId := instance.Id(c.InstanceId)
	instances, err := env.Instances([]instance.Id{instanceId})
	if err != nil {
		return err
	}
	addrs, err := instances[0].Addresses()
	if err != nil {
		return err
	}

	// Create system-identity file
	if err := agent.WriteSystemIdentityFile(agentConfig); err != nil {
		return err
	}

	// Generate a shared secret for the Mongo replica set, and write it out.
	sharedSecret, err := mongo.GenerateSharedSecret()
	if err != nil {
		return err
	}
	info, ok := agentConfig.StateServingInfo()
	if !ok {
		return fmt.Errorf("bootstrap machine config has no state serving info")
	}
	info.SharedSecret = sharedSecret
	err = c.ChangeConfig(func(agentConfig agent.ConfigSetter) {
		agentConfig.SetStateServingInfo(info)
	})
	if err != nil {
		return fmt.Errorf("cannot write agent config: %v", err)
	}
	agentConfig = c.CurrentConfig()

	if err := c.startMongo(addrs, agentConfig); err != nil {
		return err
	}

	logger.Infof("started mongo")
	// Initialise state, and store any agent config (e.g. password) changes.
	var st *state.State
	var m *state.Machine
	err = nil
	writeErr := c.ChangeConfig(func(agentConfig agent.ConfigSetter) {
		st, m, err = agent.InitializeState(
			agentConfig,
			envCfg,
			agent.BootstrapMachineConfig{
				Addresses:       addrs,
				Constraints:     c.Constraints,
				Jobs:            jobs,
				InstanceId:      instanceId,
				Characteristics: c.Hardware,
				SharedSecret:    sharedSecret,
			},
			state.DefaultDialOpts(),
			environs.NewStatePolicy(),
		)
	})
	if writeErr != nil {
		return fmt.Errorf("cannot write initial configuration: %v", err)
	}
	if err != nil {
		return err
	}
	defer st.Close()

	// bootstrap machine always gets the vote
	return m.SetHasVote(true)
}