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zkctld.go
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zkctld.go
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/*
Copyright 2023 The Vitess Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cli
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"vitess.io/vitess/go/acl"
"vitess.io/vitess/go/vt/log"
"vitess.io/vitess/go/vt/logutil"
"vitess.io/vitess/go/vt/servenv"
"vitess.io/vitess/go/vt/zkctl"
)
var (
zkCfg = "6@<hostname>:3801:3802:3803"
myID uint
zkExtra []string
Main = &cobra.Command{
Use: "zkctld",
Short: "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.",
Args: cobra.NoArgs,
Version: servenv.AppVersion.String(),
PersistentPreRunE: servenv.CobraPreRunE,
PostRun: func(cmd *cobra.Command, args []string) {
logutil.Flush()
},
RunE: run,
}
)
func init() {
servenv.OnParse(registerFlags)
}
func registerFlags(fs *pflag.FlagSet) {
fs.StringVar(&zkCfg, "zk.cfg", zkCfg,
"zkid@server1:leaderPort1:electionPort1:clientPort1,...)")
fs.UintVar(&myID, "zk.myid", myID,
"which server do you want to be? only needed when running multiple instance on one box, otherwise myid is implied by hostname")
fs.StringArrayVar(&zkExtra, "zk.extra", zkExtra,
"extra config line(s) to append verbatim to config (flag can be specified more than once)")
acl.RegisterFlags(fs)
}
func run(cmd *cobra.Command, args []string) error {
servenv.Init()
zkConfig := zkctl.MakeZkConfigFromString(zkCfg, uint32(myID))
zkConfig.Extra = zkExtra
zkd := zkctl.NewZkd(zkConfig)
if zkd.Inited() {
log.Infof("already initialized, starting without init...")
if err := zkd.Start(); err != nil {
return fmt.Errorf("failed start: %v", err)
}
} else {
log.Infof("initializing...")
if err := zkd.Init(); err != nil {
return fmt.Errorf("failed init: %v", err)
}
}
log.Infof("waiting for signal or server shutdown...")
sig := make(chan os.Signal, 1)
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")
// Action to perform if there is an error
if err := zkd.Shutdown(); err != nil {
return fmt.Errorf("error during shutdown:%v", err)
}
}
return nil
}