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etcd.go
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etcd.go
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// Copyright 2015 The etcd 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 etcdmain
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"reflect"
"runtime"
"strings"
"time"
"github.com/coreos/etcd/discovery"
"github.com/coreos/etcd/embed"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/etcdserver/api/etcdhttp"
"github.com/coreos/etcd/pkg/cors"
"github.com/coreos/etcd/pkg/fileutil"
pkgioutil "github.com/coreos/etcd/pkg/ioutil"
"github.com/coreos/etcd/pkg/osutil"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/proxy/httpproxy"
"github.com/coreos/etcd/version"
"github.com/coreos/pkg/capnslog"
"google.golang.org/grpc"
)
type dirType string
var plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdmain")
var (
dirMember = dirType("member")
dirProxy = dirType("proxy")
dirEmpty = dirType("empty")
)
func startEtcdOrProxyV2() {
grpc.EnableTracing = false
cfg := newConfig()
defaultInitialCluster := cfg.ec.InitialCluster
err := cfg.parse(os.Args[1:])
if err != nil {
plog.Errorf("error verifying flags, %v. See 'etcd --help'.", err)
switch err {
case embed.ErrUnsetAdvertiseClientURLsFlag:
plog.Errorf("When listening on specific address(es), this etcd process must advertise accessible url(s) to each connected client.")
}
os.Exit(1)
}
cfg.ec.SetupLogging()
var stopped <-chan struct{}
var errc <-chan error
plog.Infof("etcd Version: %s\n", version.Version)
plog.Infof("Git SHA: %s\n", version.GitSHA)
plog.Infof("Go Version: %s\n", runtime.Version())
plog.Infof("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
GoMaxProcs := runtime.GOMAXPROCS(0)
plog.Infof("setting maximum number of CPUs to %d, total number of available CPUs is %d", GoMaxProcs, runtime.NumCPU())
defaultHost, dhErr := (&cfg.ec).UpdateDefaultClusterFromName(defaultInitialCluster)
if defaultHost != "" {
plog.Infof("advertising using detected default host %q", defaultHost)
}
if dhErr != nil {
plog.Noticef("failed to detect default host (%v)", dhErr)
}
if cfg.ec.Dir == "" {
cfg.ec.Dir = fmt.Sprintf("%v.etcd", cfg.ec.Name)
plog.Warningf("no data-dir provided, using default data-dir ./%s", cfg.ec.Dir)
}
which := identifyDataDirOrDie(cfg.ec.Dir)
if which != dirEmpty {
plog.Noticef("the server is already initialized as %v before, starting as etcd %v...", which, which)
switch which {
case dirMember:
stopped, errc, err = startEtcd(&cfg.ec)
case dirProxy:
err = startProxy(cfg)
default:
plog.Panicf("unhandled dir type %v", which)
}
} else {
shouldProxy := cfg.isProxy()
if !shouldProxy {
stopped, errc, err = startEtcd(&cfg.ec)
if derr, ok := err.(*etcdserver.DiscoveryError); ok && derr.Err == discovery.ErrFullCluster {
if cfg.shouldFallbackToProxy() {
plog.Noticef("discovery cluster full, falling back to %s", fallbackFlagProxy)
shouldProxy = true
}
}
}
if shouldProxy {
err = startProxy(cfg)
}
}
if err != nil {
if derr, ok := err.(*etcdserver.DiscoveryError); ok {
switch derr.Err {
case discovery.ErrDuplicateID:
plog.Errorf("member %q has previously registered with discovery service token (%s).", cfg.ec.Name, cfg.ec.Durl)
plog.Errorf("But etcd could not find valid cluster configuration in the given data dir (%s).", cfg.ec.Dir)
plog.Infof("Please check the given data dir path if the previous bootstrap succeeded")
plog.Infof("or use a new discovery token if the previous bootstrap failed.")
case discovery.ErrDuplicateName:
plog.Errorf("member with duplicated name has registered with discovery service token(%s).", cfg.ec.Durl)
plog.Errorf("please check (cURL) the discovery token for more information.")
plog.Errorf("please do not reuse the discovery token and generate a new one to bootstrap the cluster.")
default:
plog.Errorf("%v", err)
plog.Infof("discovery token %s was used, but failed to bootstrap the cluster.", cfg.ec.Durl)
plog.Infof("please generate a new discovery token and try to bootstrap again.")
}
os.Exit(1)
}
if strings.Contains(err.Error(), "include") && strings.Contains(err.Error(), "--initial-cluster") {
plog.Infof("%v", err)
if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) {
plog.Infof("forgot to set --initial-cluster flag?")
}
if types.URLs(cfg.ec.APUrls).String() == embed.DefaultInitialAdvertisePeerURLs {
plog.Infof("forgot to set --initial-advertise-peer-urls flag?")
}
if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) && len(cfg.ec.Durl) == 0 {
plog.Infof("if you want to use discovery service, please set --discovery flag.")
}
os.Exit(1)
}
plog.Fatalf("%v", err)
}
osutil.HandleInterrupts()
// At this point, the initialization of etcd is done.
// The listeners are listening on the TCP ports and ready
// for accepting connections. The etcd instance should be
// joined with the cluster and ready to serve incoming
// connections.
notifySystemd()
select {
case lerr := <-errc:
// fatal out on listener errors
plog.Fatal(lerr)
case <-stopped:
}
osutil.Exit(0)
}
// startEtcd runs StartEtcd in addition to hooks needed for standalone etcd.
func startEtcd(cfg *embed.Config) (<-chan struct{}, <-chan error, error) {
e, err := embed.StartEtcd(cfg)
if err != nil {
return nil, nil, err
}
osutil.RegisterInterruptHandler(e.Close)
select {
case <-e.Server.ReadyNotify(): // wait for e.Server to join the cluster
case <-e.Server.StopNotify(): // publish aborted from 'ErrStopped'
}
return e.Server.StopNotify(), e.Err(), nil
}
// startProxy launches an HTTP proxy for client communication which proxies to other etcd nodes.
func startProxy(cfg *config) error {
plog.Notice("proxy: this proxy supports v2 API only!")
clientTLSInfo := cfg.ec.ClientTLSInfo
if clientTLSInfo.Empty() {
// Support old proxy behavior of defaulting to PeerTLSInfo
// for both client and peer connections.
clientTLSInfo = cfg.ec.PeerTLSInfo
}
clientTLSInfo.InsecureSkipVerify = cfg.ec.ClientAutoTLS
cfg.ec.PeerTLSInfo.InsecureSkipVerify = cfg.ec.PeerAutoTLS
pt, err := transport.NewTimeoutTransport(clientTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
if err != nil {
return err
}
pt.MaxIdleConnsPerHost = httpproxy.DefaultMaxIdleConnsPerHost
if err = cfg.ec.PeerSelfCert(); err != nil {
plog.Fatalf("could not get certs (%v)", err)
}
tr, err := transport.NewTimeoutTransport(cfg.ec.PeerTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
if err != nil {
return err
}
cfg.ec.Dir = filepath.Join(cfg.ec.Dir, "proxy")
err = fileutil.TouchDirAll(cfg.ec.Dir)
if err != nil {
return err
}
var peerURLs []string
clusterfile := filepath.Join(cfg.ec.Dir, "cluster")
b, err := ioutil.ReadFile(clusterfile)
switch {
case err == nil:
if cfg.ec.Durl != "" {
plog.Warningf("discovery token ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
}
if cfg.ec.DNSCluster != "" {
plog.Warningf("DNS SRV discovery ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
}
urls := struct{ PeerURLs []string }{}
err = json.Unmarshal(b, &urls)
if err != nil {
return err
}
peerURLs = urls.PeerURLs
plog.Infof("proxy: using peer urls %v from cluster file %q", peerURLs, clusterfile)
case os.IsNotExist(err):
var urlsmap types.URLsMap
urlsmap, _, err = cfg.ec.PeerURLsMapAndToken("proxy")
if err != nil {
return fmt.Errorf("error setting up initial cluster: %v", err)
}
if cfg.ec.Durl != "" {
var s string
s, err = discovery.GetCluster(cfg.ec.Durl, cfg.ec.Dproxy)
if err != nil {
return err
}
if urlsmap, err = types.NewURLsMap(s); err != nil {
return err
}
}
peerURLs = urlsmap.URLs()
plog.Infof("proxy: using peer urls %v ", peerURLs)
default:
return err
}
clientURLs := []string{}
uf := func() []string {
gcls, gerr := etcdserver.GetClusterFromRemotePeers(peerURLs, tr)
if gerr != nil {
plog.Warningf("proxy: %v", gerr)
return []string{}
}
clientURLs = gcls.ClientURLs()
urls := struct{ PeerURLs []string }{gcls.PeerURLs()}
b, jerr := json.Marshal(urls)
if jerr != nil {
plog.Warningf("proxy: error on marshal peer urls %s", jerr)
return clientURLs
}
err = pkgioutil.WriteAndSyncFile(clusterfile+".bak", b, 0600)
if err != nil {
plog.Warningf("proxy: error on writing urls %s", err)
return clientURLs
}
err = os.Rename(clusterfile+".bak", clusterfile)
if err != nil {
plog.Warningf("proxy: error on updating clusterfile %s", err)
return clientURLs
}
if !reflect.DeepEqual(gcls.PeerURLs(), peerURLs) {
plog.Noticef("proxy: updated peer urls in cluster file from %v to %v", peerURLs, gcls.PeerURLs())
}
peerURLs = gcls.PeerURLs()
return clientURLs
}
ph := httpproxy.NewHandler(pt, uf, time.Duration(cfg.cp.ProxyFailureWaitMs)*time.Millisecond, time.Duration(cfg.cp.ProxyRefreshIntervalMs)*time.Millisecond)
ph = &cors.CORSHandler{
Handler: ph,
Info: cfg.ec.CorsInfo,
}
if cfg.isReadonlyProxy() {
ph = httpproxy.NewReadonlyHandler(ph)
}
// setup self signed certs when serving https
cHosts, cTLS := []string{}, false
for _, u := range cfg.ec.LCUrls {
cHosts = append(cHosts, u.Host)
cTLS = cTLS || u.Scheme == "https"
}
for _, u := range cfg.ec.ACUrls {
cHosts = append(cHosts, u.Host)
cTLS = cTLS || u.Scheme == "https"
}
listenerTLS := cfg.ec.ClientTLSInfo
if cfg.ec.ClientAutoTLS && cTLS {
listenerTLS, err = transport.SelfCert(filepath.Join(cfg.ec.Dir, "clientCerts"), cHosts)
if err != nil {
plog.Fatalf("proxy: could not initialize self-signed client certs (%v)", err)
}
}
// Start a proxy server goroutine for each listen address
for _, u := range cfg.ec.LCUrls {
l, err := transport.NewListener(u.Host, u.Scheme, &listenerTLS)
if err != nil {
return err
}
host := u.String()
go func() {
plog.Info("proxy: listening for client requests on ", host)
mux := http.NewServeMux()
etcdhttp.HandlePrometheus(mux) // v2 proxy just uses the same port
mux.Handle("/", ph)
plog.Fatal(http.Serve(l, mux))
}()
}
return nil
}
// 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 checkSupportArch() {
// TODO qualify arm64
if runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64le" {
return
}
// unsupported arch only configured via environment variable
// so unset here to not parse through flag
defer os.Unsetenv("ETCD_UNSUPPORTED_ARCH")
if env, ok := os.LookupEnv("ETCD_UNSUPPORTED_ARCH"); ok && env == runtime.GOARCH {
plog.Warningf("running etcd on unsupported architecture %q since ETCD_UNSUPPORTED_ARCH is set", env)
return
}
plog.Errorf("etcd on unsupported platform without ETCD_UNSUPPORTED_ARCH=%s set.", runtime.GOARCH)
os.Exit(1)
}