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 }