func (p *JujuProvisioner) removeUnit(app provision.App, unit provision.AppUnit) error {
var (
buf bytes.Buffer
err error
)
cmd := []string{"remove-unit", unit.GetName()}
// Sometimes juju gives the "no node" error. This is one of Zookeeper bad
// behaviors. Let's try it multiple times before raising the error to the
// user, and hope that someday we run away from Zookeeper.
for i := 0; i < destroyTries; i++ {
buf.Reset()
err = runCmd(false, &buf, &buf, cmd...)
if err != nil && unitNotFound(unit.GetName(), buf.Bytes()) {
err = nil
}
if err == nil {
break
}
}
if err != nil {
return cmdError(buf.String(), err, cmd)
}
if p.elbSupport() {
router, err := Router()
if err != nil {
return err
}
err = router.RemoveRoute(app.GetName(), unit.GetInstanceId())
}
collection := p.unitsCollection()
defer collection.Close()
collection.RemoveId(unit.GetName())
go p.terminateMachines(app, unit)
return err
}
func Example() {
router, err := router.Get("hipache")
if err != nil {
panic(err)
}
err = router.AddBackend("myapp")
if err != nil {
panic(err)
}
url, err := url.Parse("http://10.10.10.10:8080")
if err != nil {
panic(err)
}
err = router.AddRoute("myapp", url)
if err != nil {
panic(err)
}
addr, _ := router.Addr("myapp")
fmt.Println("Please access:", addr)
err = router.RemoveRoute("myapp", url)
if err != nil {
panic(err)
}
err = router.RemoveBackend("myapp")
if err != nil {
panic(err)
}
}
func (p *JujuProvisioner) heal(units []provision.Unit) {
var inst instance
coll := p.unitsCollection()
defer coll.Close()
for _, unit := range units {
err := coll.FindId(unit.Name).One(&inst)
if err != nil {
coll.Insert(instance{UnitName: unit.Name, InstanceID: unit.InstanceId})
} else if unit.InstanceId == inst.InstanceID {
continue
} else {
format := "[juju] instance-id of unit %q changed from %q to %q. Healing."
log.Debugf(format, unit.Name, inst.InstanceID, unit.InstanceId)
if p.elbSupport() {
router, err := Router()
if err != nil {
continue
}
router.RemoveRoute(unit.AppName, inst.InstanceID)
err = router.AddRoute(unit.AppName, unit.InstanceId)
if err != nil {
format := "[juju] Could not register instance %q in the load balancer: %s."
log.Errorf(format, unit.InstanceId, err)
continue
}
}
if inst.InstanceID != "pending" {
msg := queue.Message{
Action: app.RegenerateApprcAndStart,
Args: []string{unit.AppName, unit.Name},
}
app.Enqueue(msg)
}
inst.InstanceID = unit.InstanceId
coll.UpdateId(unit.Name, inst)
}
}
}