// Run runs a unit agent.
func (a *UnitAgent) Run(ctx *cmd.Context) error {
defer a.tomb.Done()
if err := a.ReadConfig(a.Tag().String()); err != nil {
return err
}
agentConfig := a.CurrentConfig()
agentLogger.Infof("unit agent %v start (%s [%s])", a.Tag().String(), jujuversion.Current, runtime.Compiler)
if flags := featureflag.String(); flags != "" {
logger.Warningf("developer feature flags enabled: %s", flags)
}
network.SetPreferIPv6(agentConfig.PreferIPv6())
// Sometimes there are upgrade steps that are needed for each unit.
// There are plans afoot to unify the unit and machine agents. When
// this happens, there will be a simple helper function for the upgrade
// steps to run something for each unit on the machine. Until then, we
// need to have the uniter do it, as the overhead of getting a full
// upgrade process in the unit agent out weights the current benefits.
// So.. since the upgrade steps are all idempotent, we will just call
// the upgrade steps when we start the uniter. To be clear, these
// should move back to the upgrade package when we do unify the agents.
runUpgrades(agentConfig.Tag(), agentConfig.DataDir())
a.runner.StartWorker("api", a.APIWorkers)
err := cmdutil.AgentDone(logger, a.runner.Wait())
a.tomb.Kill(err)
return err
}
// Run runs a machine agent.
func (a *MachineAgent) Run(*cmd.Context) error {
defer a.tomb.Done()
if err := a.ReadConfig(a.Tag().String()); err != nil {
return errors.Errorf("cannot read agent configuration: %v", err)
}
logger.Infof("machine agent %v start (%s [%s])", a.Tag(), jujuversion.Current, runtime.Compiler)
if flags := featureflag.String(); flags != "" {
logger.Warningf("developer feature flags enabled: %s", flags)
}
if err := introspection.WriteProfileFunctions(); err != nil {
// This isn't fatal, just annoying.
logger.Errorf("failed to write profile funcs: %v", err)
}
// Before doing anything else, we need to make sure the certificate generated for
// use by mongo to validate controller connections is correct. This needs to be done
// before any possible restart of the mongo service.
// See bug http://pad.lv/1434680
if err := a.upgradeCertificateDNSNames(); err != nil {
return errors.Annotate(err, "error upgrading server certificate")
}
if upgradeComplete, err := upgradesteps.NewLock(a); err != nil {
return errors.Annotate(err, "error during creating upgrade completion channel")
} else {
a.upgradeComplete = upgradeComplete
}
agentConfig := a.CurrentConfig()
createEngine := a.makeEngineCreator(agentConfig.UpgradedToVersion())
charmrepo.CacheDir = filepath.Join(agentConfig.DataDir(), "charmcache")
if err := a.createJujudSymlinks(agentConfig.DataDir()); err != nil {
return err
}
a.runner.StartWorker("engine", createEngine)
// At this point, all workers will have been configured to start
close(a.workersStarted)
err := a.runner.Wait()
switch errors.Cause(err) {
case worker.ErrTerminateAgent:
err = a.uninstallAgent()
case worker.ErrRebootMachine:
logger.Infof("Caught reboot error")
err = a.executeRebootOrShutdown(params.ShouldReboot)
case worker.ErrShutdownMachine:
logger.Infof("Caught shutdown error")
err = a.executeRebootOrShutdown(params.ShouldShutdown)
}
err = cmdutil.AgentDone(logger, err)
a.tomb.Kill(err)
return err
}
// Run runs a unit agent.
func (a *UnitAgent) Run(ctx *cmd.Context) error {
defer a.tomb.Done()
if err := a.ReadConfig(a.Tag().String()); err != nil {
return err
}
agentLogger.Infof("unit agent %v start (%s [%s])", a.Tag().String(), jujuversion.Current, runtime.Compiler)
if flags := featureflag.String(); flags != "" {
logger.Warningf("developer feature flags enabled: %s", flags)
}
a.runner.StartWorker("api", a.APIWorkers)
err := cmdutil.AgentDone(logger, a.runner.Wait())
a.tomb.Kill(err)
return err
}