535 lines
17 KiB
Go
535 lines
17 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package etcdmain
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"path"
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"reflect"
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"runtime"
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"strings"
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"time"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-systemd/daemon"
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systemdutil "github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-systemd/util"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus"
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"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/netutil"
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"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
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"github.com/coreos/etcd/discovery"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/etcdserver/api/v3rpc"
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"github.com/coreos/etcd/etcdserver/etcdhttp"
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"github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/pkg/cors"
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"github.com/coreos/etcd/pkg/fileutil"
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"github.com/coreos/etcd/pkg/osutil"
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runtimeutil "github.com/coreos/etcd/pkg/runtime"
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"github.com/coreos/etcd/pkg/transport"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/proxy"
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"github.com/coreos/etcd/rafthttp"
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"github.com/coreos/etcd/version"
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)
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type dirType string
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var plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdmain")
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const (
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// the owner can make/remove files inside the directory
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privateDirMode = 0700
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// internal fd usage includes disk usage and transport usage.
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// To read/write snapshot, snap pkg needs 1. In normal case, wal pkg needs
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// at most 2 to read/lock/write WALs. One case that it needs to 2 is to
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// read all logs after some snapshot index, which locates at the end of
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// the second last and the head of the last. For purging, it needs to read
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// directory, so it needs 1. For fd monitor, it needs 1.
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// For transport, rafthttp builds two long-polling connections and at most
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// four temporary connections with each member. There are at most 9 members
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// in a cluster, so it should reserve 96.
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// For the safety, we set the total reserved number to 150.
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reservedInternalFDNum = 150
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)
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var (
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dirMember = dirType("member")
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dirProxy = dirType("proxy")
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dirEmpty = dirType("empty")
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)
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func Main() {
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cfg := NewConfig()
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err := cfg.Parse(os.Args[1:])
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if err != nil {
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plog.Errorf("error verifying flags, %v. See 'etcd --help'.", err)
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switch err {
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case errUnsetAdvertiseClientURLsFlag:
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plog.Errorf("When listening on specific address(es), this etcd process must advertise accessible url(s) to each connected client.")
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}
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os.Exit(1)
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}
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setupLogging(cfg)
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var stopped <-chan struct{}
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plog.Infof("etcd Version: %s\n", version.Version)
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plog.Infof("Git SHA: %s\n", version.GitSHA)
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plog.Infof("Go Version: %s\n", runtime.Version())
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plog.Infof("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
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GoMaxProcs := runtime.GOMAXPROCS(0)
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plog.Infof("setting maximum number of CPUs to %d, total number of available CPUs is %d", GoMaxProcs, runtime.NumCPU())
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// TODO: check whether fields are set instead of whether fields have default value
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if cfg.name != defaultName && cfg.initialCluster == initialClusterFromName(defaultName) {
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cfg.initialCluster = initialClusterFromName(cfg.name)
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}
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if cfg.dir == "" {
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cfg.dir = fmt.Sprintf("%v.etcd", cfg.name)
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plog.Warningf("no data-dir provided, using default data-dir ./%s", cfg.dir)
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}
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which := identifyDataDirOrDie(cfg.dir)
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if which != dirEmpty {
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plog.Noticef("the server is already initialized as %v before, starting as etcd %v...", which, which)
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switch which {
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case dirMember:
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stopped, err = startEtcd(cfg)
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case dirProxy:
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err = startProxy(cfg)
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default:
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plog.Panicf("unhandled dir type %v", which)
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}
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} else {
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shouldProxy := cfg.isProxy()
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if !shouldProxy {
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stopped, err = startEtcd(cfg)
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if derr, ok := err.(*etcdserver.DiscoveryError); ok && derr.Err == discovery.ErrFullCluster {
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if cfg.shouldFallbackToProxy() {
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plog.Noticef("discovery cluster full, falling back to %s", fallbackFlagProxy)
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shouldProxy = true
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}
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}
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}
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if shouldProxy {
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err = startProxy(cfg)
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}
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}
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if err != nil {
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if derr, ok := err.(*etcdserver.DiscoveryError); ok {
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switch derr.Err {
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case discovery.ErrDuplicateID:
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plog.Errorf("member %q has previously registered with discovery service token (%s).", cfg.name, cfg.durl)
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plog.Errorf("But etcd could not find valid cluster configuration in the given data dir (%s).", cfg.dir)
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plog.Infof("Please check the given data dir path if the previous bootstrap succeeded")
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plog.Infof("or use a new discovery token if the previous bootstrap failed.")
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case discovery.ErrDuplicateName:
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plog.Errorf("member with duplicated name has registered with discovery service token(%s).", cfg.durl)
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plog.Errorf("please check (cURL) the discovery token for more information.")
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plog.Errorf("please do not reuse the discovery token and generate a new one to bootstrap the cluster.")
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default:
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plog.Errorf("%v", err)
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plog.Infof("discovery token %s was used, but failed to bootstrap the cluster.", cfg.durl)
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plog.Infof("please generate a new discovery token and try to bootstrap again.")
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}
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os.Exit(1)
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}
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if strings.Contains(err.Error(), "include") && strings.Contains(err.Error(), "--initial-cluster") {
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plog.Infof("%v", err)
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if cfg.initialCluster == initialClusterFromName(cfg.name) {
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plog.Infof("forgot to set --initial-cluster flag?")
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}
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if types.URLs(cfg.apurls).String() == defaultInitialAdvertisePeerURLs {
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plog.Infof("forgot to set --initial-advertise-peer-urls flag?")
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}
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if cfg.initialCluster == initialClusterFromName(cfg.name) && len(cfg.durl) == 0 {
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plog.Infof("if you want to use discovery service, please set --discovery flag.")
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}
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os.Exit(1)
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}
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plog.Fatalf("%v", err)
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}
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osutil.HandleInterrupts()
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if systemdutil.IsRunningSystemd() {
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// At this point, the initialization of etcd is done.
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// The listeners are listening on the TCP ports and ready
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// for accepting connections.
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// The http server is probably ready for serving incoming
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// connections. If it is not, the connection might be pending
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// for less than one second.
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err := daemon.SdNotify("READY=1")
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if err != nil {
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plog.Errorf("failed to notify systemd for readiness: %v", err)
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if err == daemon.SdNotifyNoSocket {
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plog.Errorf("forgot to set Type=notify in systemd service file?")
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}
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}
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}
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<-stopped
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osutil.Exit(0)
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}
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// startEtcd launches the etcd server and HTTP handlers for client/server communication.
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func startEtcd(cfg *config) (<-chan struct{}, error) {
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urlsmap, token, err := getPeerURLsMapAndToken(cfg, "etcd")
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if err != nil {
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return nil, fmt.Errorf("error setting up initial cluster: %v", err)
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}
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if !cfg.peerTLSInfo.Empty() {
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plog.Infof("peerTLS: %s", cfg.peerTLSInfo)
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}
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plns := make([]net.Listener, 0)
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for _, u := range cfg.lpurls {
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if u.Scheme == "http" && !cfg.peerTLSInfo.Empty() {
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plog.Warningf("The scheme of peer url %s is http while peer key/cert files are presented. Ignored peer key/cert files.", u.String())
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}
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var l net.Listener
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l, err = rafthttp.NewListener(u, cfg.peerTLSInfo)
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if err != nil {
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return nil, err
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}
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urlStr := u.String()
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plog.Info("listening for peers on ", urlStr)
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defer func() {
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if err != nil {
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l.Close()
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plog.Info("stopping listening for peers on ", urlStr)
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}
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}()
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plns = append(plns, l)
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}
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if !cfg.clientTLSInfo.Empty() {
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plog.Infof("clientTLS: %s", cfg.clientTLSInfo)
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}
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clns := make([]net.Listener, 0)
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for _, u := range cfg.lcurls {
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if u.Scheme == "http" && !cfg.clientTLSInfo.Empty() {
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plog.Warningf("The scheme of client url %s is http while client key/cert files are presented. Ignored client key/cert files.", u.String())
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}
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var l net.Listener
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l, err = transport.NewKeepAliveListener(u.Host, u.Scheme, cfg.clientTLSInfo)
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if err != nil {
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return nil, err
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}
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if fdLimit, err := runtimeutil.FDLimit(); err == nil {
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if fdLimit <= reservedInternalFDNum {
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plog.Fatalf("file descriptor limit[%d] of etcd process is too low, and should be set higher than %d to ensure internal usage", fdLimit, reservedInternalFDNum)
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}
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l = netutil.LimitListener(l, int(fdLimit-reservedInternalFDNum))
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}
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urlStr := u.String()
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plog.Info("listening for client requests on ", urlStr)
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defer func() {
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if err != nil {
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l.Close()
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plog.Info("stopping listening for client requests on ", urlStr)
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}
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}()
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clns = append(clns, l)
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}
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var v3l net.Listener
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if cfg.v3demo {
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v3l, err = net.Listen("tcp", cfg.gRPCAddr)
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if err != nil {
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plog.Fatal(err)
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}
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plog.Infof("listening for client rpc on %s", cfg.gRPCAddr)
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}
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srvcfg := &etcdserver.ServerConfig{
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Name: cfg.name,
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ClientURLs: cfg.acurls,
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PeerURLs: cfg.apurls,
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DataDir: cfg.dir,
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DedicatedWALDir: cfg.walDir,
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SnapCount: cfg.snapCount,
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MaxSnapFiles: cfg.maxSnapFiles,
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MaxWALFiles: cfg.maxWalFiles,
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InitialPeerURLsMap: urlsmap,
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InitialClusterToken: token,
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DiscoveryURL: cfg.durl,
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DiscoveryProxy: cfg.dproxy,
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NewCluster: cfg.isNewCluster(),
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ForceNewCluster: cfg.forceNewCluster,
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PeerTLSInfo: cfg.peerTLSInfo,
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TickMs: cfg.TickMs,
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ElectionTicks: cfg.electionTicks(),
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V3demo: cfg.v3demo,
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StrictReconfigCheck: cfg.strictReconfigCheck,
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}
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var s *etcdserver.EtcdServer
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s, err = etcdserver.NewServer(srvcfg)
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if err != nil {
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return nil, err
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}
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s.Start()
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osutil.RegisterInterruptHandler(s.Stop)
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if cfg.corsInfo.String() != "" {
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plog.Infof("cors = %s", cfg.corsInfo)
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}
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ch := &cors.CORSHandler{
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Handler: etcdhttp.NewClientHandler(s, srvcfg.ReqTimeout()),
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Info: cfg.corsInfo,
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}
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ph := etcdhttp.NewPeerHandler(s.Cluster(), s.RaftHandler())
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// Start the peer server in a goroutine
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for _, l := range plns {
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go func(l net.Listener) {
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plog.Fatal(serveHTTP(l, ph, 5*time.Minute))
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}(l)
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}
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// Start a client server goroutine for each listen address
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for _, l := range clns {
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go func(l net.Listener) {
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// read timeout does not work with http close notify
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// TODO: https://github.com/golang/go/issues/9524
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plog.Fatal(serveHTTP(l, ch, 0))
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}(l)
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}
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if cfg.v3demo {
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// set up v3 demo rpc
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grpcServer := grpc.NewServer()
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etcdserverpb.RegisterKVServer(grpcServer, v3rpc.NewKVServer(s))
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etcdserverpb.RegisterWatchServer(grpcServer, v3rpc.NewWatchServer(s.Watchable()))
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go func() { plog.Fatal(grpcServer.Serve(v3l)) }()
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}
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return s.StopNotify(), nil
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}
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// startProxy launches an HTTP proxy for client communication which proxies to other etcd nodes.
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func startProxy(cfg *config) error {
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urlsmap, _, err := getPeerURLsMapAndToken(cfg, "proxy")
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if err != nil {
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return fmt.Errorf("error setting up initial cluster: %v", err)
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}
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pt, err := transport.NewTimeoutTransport(cfg.peerTLSInfo, time.Duration(cfg.proxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.proxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.proxyWriteTimeoutMs)*time.Millisecond)
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if err != nil {
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return err
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}
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pt.MaxIdleConnsPerHost = proxy.DefaultMaxIdleConnsPerHost
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tr, err := transport.NewTimeoutTransport(cfg.peerTLSInfo, time.Duration(cfg.proxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.proxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.proxyWriteTimeoutMs)*time.Millisecond)
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if err != nil {
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return err
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}
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cfg.dir = path.Join(cfg.dir, "proxy")
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err = os.MkdirAll(cfg.dir, 0700)
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if err != nil {
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return err
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}
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var peerURLs []string
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clusterfile := path.Join(cfg.dir, "cluster")
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b, err := ioutil.ReadFile(clusterfile)
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switch {
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case err == nil:
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if cfg.durl != "" {
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plog.Warningf("discovery token ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
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}
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urls := struct{ PeerURLs []string }{}
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err = json.Unmarshal(b, &urls)
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if err != nil {
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return err
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}
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peerURLs = urls.PeerURLs
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plog.Infof("proxy: using peer urls %v from cluster file %q", peerURLs, clusterfile)
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case os.IsNotExist(err):
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if cfg.durl != "" {
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s, err := discovery.GetCluster(cfg.durl, cfg.dproxy)
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if err != nil {
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return err
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}
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if urlsmap, err = types.NewURLsMap(s); err != nil {
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return err
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}
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}
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peerURLs = urlsmap.URLs()
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plog.Infof("proxy: using peer urls %v ", peerURLs)
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default:
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return err
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}
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clientURLs := []string{}
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uf := func() []string {
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gcls, err := etcdserver.GetClusterFromRemotePeers(peerURLs, tr)
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// TODO: remove the 2nd check when we fix GetClusterFromPeers
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// GetClusterFromPeers should not return nil error with an invalid empty cluster
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if err != nil {
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plog.Warningf("proxy: %v", err)
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return []string{}
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}
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if len(gcls.Members()) == 0 {
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return clientURLs
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}
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clientURLs = gcls.ClientURLs()
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urls := struct{ PeerURLs []string }{gcls.PeerURLs()}
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b, err := json.Marshal(urls)
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if err != nil {
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plog.Warningf("proxy: error on marshal peer urls %s", err)
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return clientURLs
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}
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err = ioutil.WriteFile(clusterfile+".bak", b, 0600)
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if err != nil {
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plog.Warningf("proxy: error on writing urls %s", err)
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return clientURLs
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}
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err = os.Rename(clusterfile+".bak", clusterfile)
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if err != nil {
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plog.Warningf("proxy: error on updating clusterfile %s", err)
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return clientURLs
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}
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if !reflect.DeepEqual(gcls.PeerURLs(), peerURLs) {
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plog.Noticef("proxy: updated peer urls in cluster file from %v to %v", peerURLs, gcls.PeerURLs())
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}
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peerURLs = gcls.PeerURLs()
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return clientURLs
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}
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ph := proxy.NewHandler(pt, uf, time.Duration(cfg.proxyFailureWaitMs)*time.Millisecond, time.Duration(cfg.proxyRefreshIntervalMs)*time.Millisecond)
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ph = &cors.CORSHandler{
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Handler: ph,
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Info: cfg.corsInfo,
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}
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if cfg.isReadonlyProxy() {
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ph = proxy.NewReadonlyHandler(ph)
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}
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// Start a proxy server goroutine for each listen address
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for _, u := range cfg.lcurls {
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l, err := transport.NewListener(u.Host, u.Scheme, cfg.clientTLSInfo)
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if err != nil {
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return err
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}
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host := u.String()
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go func() {
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plog.Info("proxy: listening for client requests on ", host)
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mux := http.NewServeMux()
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mux.Handle("/metrics", prometheus.Handler())
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mux.Handle("/", ph)
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plog.Fatal(http.Serve(l, mux))
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}()
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}
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return nil
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}
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// getPeerURLsMapAndToken sets up an initial peer URLsMap and cluster token for bootstrap or discovery.
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func getPeerURLsMapAndToken(cfg *config, which string) (urlsmap types.URLsMap, token string, err error) {
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switch {
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case cfg.durl != "":
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urlsmap = types.URLsMap{}
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// If using discovery, generate a temporary cluster based on
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// self's advertised peer URLs
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urlsmap[cfg.name] = cfg.apurls
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token = cfg.durl
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case cfg.dnsCluster != "":
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var clusterStr string
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clusterStr, token, err = discovery.SRVGetCluster(cfg.name, cfg.dnsCluster, cfg.initialClusterToken, cfg.apurls)
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if err != nil {
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return nil, "", err
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}
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urlsmap, err = types.NewURLsMap(clusterStr)
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|
// only etcd member must belong to the discovered cluster.
|
|
// proxy does not need to belong to the discovered cluster.
|
|
if which == "etcd" {
|
|
if _, ok := urlsmap[cfg.name]; !ok {
|
|
return nil, "", fmt.Errorf("cannot find local etcd member %q in SRV records", cfg.name)
|
|
}
|
|
}
|
|
default:
|
|
// We're statically configured, and cluster has appropriately been set.
|
|
urlsmap, err = types.NewURLsMap(cfg.initialCluster)
|
|
token = cfg.initialClusterToken
|
|
}
|
|
return urlsmap, token, err
|
|
}
|
|
|
|
// identifyDataDirOrDie returns the type of the data dir.
|
|
// Dies if the datadir is invalid.
|
|
func identifyDataDirOrDie(dir string) dirType {
|
|
names, err := fileutil.ReadDir(dir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return dirEmpty
|
|
}
|
|
plog.Fatalf("error listing data dir: %s", dir)
|
|
}
|
|
|
|
var m, p bool
|
|
for _, name := range names {
|
|
switch dirType(name) {
|
|
case dirMember:
|
|
m = true
|
|
case dirProxy:
|
|
p = true
|
|
default:
|
|
plog.Warningf("found invalid file/dir %s under data dir %s (Ignore this if you are upgrading etcd)", name, dir)
|
|
}
|
|
}
|
|
|
|
if m && p {
|
|
plog.Fatal("invalid datadir. Both member and proxy directories exist.")
|
|
}
|
|
if m {
|
|
return dirMember
|
|
}
|
|
if p {
|
|
return dirProxy
|
|
}
|
|
return dirEmpty
|
|
}
|
|
|
|
func setupLogging(cfg *config) {
|
|
capnslog.SetGlobalLogLevel(capnslog.INFO)
|
|
if cfg.debug {
|
|
capnslog.SetGlobalLogLevel(capnslog.DEBUG)
|
|
}
|
|
if cfg.logPkgLevels != "" {
|
|
repoLog := capnslog.MustRepoLogger("github.com/coreos/etcd")
|
|
settings, err := repoLog.ParseLogLevelConfig(cfg.logPkgLevels)
|
|
if err != nil {
|
|
plog.Warningf("couldn't parse log level string: %s, continuing with default levels", err.Error())
|
|
return
|
|
}
|
|
repoLog.SetLogLevel(settings)
|
|
}
|
|
}
|