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zkctld.go
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zkctld.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// zkctld is a daemon that starts or initializes ZooKeeper with Vitess-specific
// configuration. It will stay running as long as the underlying ZooKeeper
// server, and will pass along SIGTERM.
package main
import (
"flag"
"os"
"os/signal"
"syscall"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/exit"
"github.com/youtube/vitess/go/vt/logutil"
"github.com/youtube/vitess/go/zk/zkctl"
)
var (
zkCfg = flag.String("zk.cfg", "6@<hostname>:3801:3802:3803",
"zkid@server1:leaderPort1:electionPort1:clientPort1,...)")
myId = flag.Uint("zk.myid", 0,
"which server do you want to be? only needed when running multiple instance on one box, otherwise myid is implied by hostname")
)
func main() {
defer exit.Recover()
defer logutil.Flush()
flag.Parse()
zkConfig := zkctl.MakeZkConfigFromString(*zkCfg, uint32(*myId))
zkd := zkctl.NewZkd(zkConfig)
if zkd.Inited() {
log.Infof("already initialized, starting without init...")
if err := zkd.Start(); err != nil {
log.Errorf("failed start: %v", err)
exit.Return(255)
}
} else {
log.Infof("initializing...")
if err := zkd.Init(); err != nil {
log.Errorf("failed init: %v", err)
exit.Return(255)
}
}
log.Infof("waiting for signal or server shutdown...")
sig := make(chan os.Signal)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
select {
case <-zkd.Done():
log.Infof("server shut down on its own")
case <-sig:
log.Infof("signal received, shutting down server")
zkd.Shutdown()
}
}