mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
491 lines
18 KiB
Go
491 lines
18 KiB
Go
// Copyright 2015 The etcd Authors
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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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// Every change should be reflected on help.go as well.
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package etcdmain
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"net/url"
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"os"
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"runtime"
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"strings"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/pkg/cors"
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"github.com/coreos/etcd/pkg/flags"
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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/version"
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"github.com/ghodss/yaml"
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)
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const (
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proxyFlagOff = "off"
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proxyFlagReadonly = "readonly"
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proxyFlagOn = "on"
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fallbackFlagExit = "exit"
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fallbackFlagProxy = "proxy"
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clusterStateFlagNew = "new"
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clusterStateFlagExisting = "existing"
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defaultName = "default"
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defaultInitialAdvertisePeerURLs = "http://localhost:2380"
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defaultAdvertiseClientURLs = "http://localhost:2379"
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defaultListenPeerURLs = "http://localhost:2380"
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defaultListenClientURLs = "http://localhost:2379"
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// maxElectionMs specifies the maximum value of election timeout.
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// More details are listed in ../Documentation/tuning.md#time-parameters.
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maxElectionMs = 50000
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)
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var (
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ignored = []string{
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"cluster-active-size",
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"cluster-remove-delay",
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"cluster-sync-interval",
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"config",
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"force",
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"max-result-buffer",
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"max-retry-attempts",
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"peer-heartbeat-interval",
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"peer-election-timeout",
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"retry-interval",
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"snapshot",
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"v",
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"vv",
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}
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ErrConflictBootstrapFlags = fmt.Errorf("multiple discovery or bootstrap flags are set. " +
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"Choose one of \"initial-cluster\", \"discovery\" or \"discovery-srv\"")
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errUnsetAdvertiseClientURLsFlag = fmt.Errorf("--advertise-client-urls is required when --listen-client-urls is set explicitly")
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)
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type config struct {
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*flag.FlagSet
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// member
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corsInfo *cors.CORSInfo
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lpurls, lcurls []url.URL
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Dir string `json:"data-dir"`
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WalDir string `json:"wal-dir"`
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MaxSnapFiles uint `json:"max-snapshots"`
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MaxWalFiles uint `json:"max-wals"`
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Name string `json:"name"`
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SnapCount uint64 `json:"snapshot-count"`
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LPUrlsCfgFile string `json:"listen-peer-urls"`
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LCUrlsCfgFile string `json:"listen-client-urls"`
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CorsCfgFile string `json:"cors"`
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// TickMs is the number of milliseconds between heartbeat ticks.
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// TODO: decouple tickMs and heartbeat tick (current heartbeat tick = 1).
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// make ticks a cluster wide configuration.
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TickMs uint `json:"heartbeat-interval"`
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ElectionMs uint `json:"election-timeout"`
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QuotaBackendBytes int64 `json:"quota-backend-bytes"`
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// clustering
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apurls, acurls []url.URL
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clusterState *flags.StringsFlag
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DnsCluster string `json:"discovery-srv"`
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Dproxy string `json:"discovery-proxy"`
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Durl string `json:"discovery"`
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fallback *flags.StringsFlag
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InitialCluster string `json:"initial-cluster"`
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InitialClusterToken string `json:"initial-cluster-token"`
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StrictReconfigCheck bool `json:"strict-reconfig-check"`
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ApurlsCfgFile string `json:"initial-advertise-peer-urls"`
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AcurlsCfgFile string `json:"advertise-client-urls"`
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ClusterStateCfgFile string `json:"initial-cluster-state"`
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FallbackCfgFile string `json:"discovery-fallback"`
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// proxy
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proxy *flags.StringsFlag
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ProxyFailureWaitMs uint `json:"proxy-failure-wait"`
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ProxyRefreshIntervalMs uint `json:"proxy-refresh-interval"`
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ProxyDialTimeoutMs uint `json:"proxy-dial-timeout"`
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ProxyWriteTimeoutMs uint `json:"proxy-write-timeout"`
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ProxyReadTimeoutMs uint `json:"proxy-read-timeout"`
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ProxyCfgFile string `json:"proxy"`
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// security
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clientTLSInfo, peerTLSInfo transport.TLSInfo
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ClientAutoTLS bool
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PeerAutoTLS bool
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ClientSecurityCfgFile securityConfig `json:"client-transport-security"`
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PeerSecurityCfgFile securityConfig `json:"peer-transport-security"`
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// Debug logging
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Debug bool `json:"debug"`
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LogPkgLevels string `json:"log-package-levels"`
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// ForceNewCluster is unsafe
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ForceNewCluster bool `json:"force-new-cluster"`
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printVersion bool
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autoCompactionRetention int
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enablePprof bool
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configFile string
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ignored []string
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}
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type securityConfig struct {
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CAFile string `json:"ca-file"`
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CertFile string `json:"cert-file"`
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KeyFile string `json:"key-file"`
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CertAuth bool `json:"client-cert-auth"`
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TrustedCAFile string `json:"trusted-ca-file"`
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AutoTLS bool `json:"auto-tls"`
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}
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func NewConfig() *config {
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cfg := &config{
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corsInfo: &cors.CORSInfo{},
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clusterState: flags.NewStringsFlag(
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clusterStateFlagNew,
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clusterStateFlagExisting,
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),
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fallback: flags.NewStringsFlag(
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fallbackFlagExit,
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fallbackFlagProxy,
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),
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ignored: ignored,
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proxy: flags.NewStringsFlag(
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proxyFlagOff,
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proxyFlagReadonly,
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proxyFlagOn,
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),
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}
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cfg.FlagSet = flag.NewFlagSet("etcd", flag.ContinueOnError)
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fs := cfg.FlagSet
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fs.Usage = func() {
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fmt.Println(usageline)
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}
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fs.StringVar(&cfg.configFile, "config-file", "", "Path to the server configuration file")
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// member
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fs.Var(cfg.corsInfo, "cors", "Comma-separated white list of origins for CORS (cross-origin resource sharing).")
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fs.StringVar(&cfg.Dir, "data-dir", "", "Path to the data directory.")
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fs.StringVar(&cfg.WalDir, "wal-dir", "", "Path to the dedicated wal directory.")
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fs.Var(flags.NewURLsValue(defaultListenPeerURLs), "listen-peer-urls", "List of URLs to listen on for peer traffic.")
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fs.Var(flags.NewURLsValue(defaultListenClientURLs), "listen-client-urls", "List of URLs to listen on for client traffic.")
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fs.UintVar(&cfg.MaxSnapFiles, "max-snapshots", defaultMaxSnapshots, "Maximum number of snapshot files to retain (0 is unlimited).")
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fs.UintVar(&cfg.MaxWalFiles, "max-wals", defaultMaxWALs, "Maximum number of wal files to retain (0 is unlimited).")
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fs.StringVar(&cfg.Name, "name", defaultName, "Human-readable name for this member.")
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fs.Uint64Var(&cfg.SnapCount, "snapshot-count", etcdserver.DefaultSnapCount, "Number of committed transactions to trigger a snapshot to disk.")
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fs.UintVar(&cfg.TickMs, "heartbeat-interval", 100, "Time (in milliseconds) of a heartbeat interval.")
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fs.UintVar(&cfg.ElectionMs, "election-timeout", 1000, "Time (in milliseconds) for an election to timeout.")
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fs.Int64Var(&cfg.QuotaBackendBytes, "quota-backend-bytes", 0, "Raise alarms when backend size exceeds the given quota. 0 means use the default quota.")
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// clustering
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fs.Var(flags.NewURLsValue(defaultInitialAdvertisePeerURLs), "initial-advertise-peer-urls", "List of this member's peer URLs to advertise to the rest of the cluster.")
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fs.Var(flags.NewURLsValue(defaultAdvertiseClientURLs), "advertise-client-urls", "List of this member's client URLs to advertise to the public.")
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fs.StringVar(&cfg.Durl, "discovery", "", "Discovery URL used to bootstrap the cluster.")
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fs.Var(cfg.fallback, "discovery-fallback", fmt.Sprintf("Valid values include %s", strings.Join(cfg.fallback.Values, ", ")))
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if err := cfg.fallback.Set(fallbackFlagProxy); err != nil {
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// Should never happen.
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plog.Panicf("unexpected error setting up discovery-fallback flag: %v", err)
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}
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fs.StringVar(&cfg.Dproxy, "discovery-proxy", "", "HTTP proxy to use for traffic to discovery service.")
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fs.StringVar(&cfg.DnsCluster, "discovery-srv", "", "DNS domain used to bootstrap initial cluster.")
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fs.StringVar(&cfg.InitialCluster, "initial-cluster", initialClusterFromName(defaultName), "Initial cluster configuration for bootstrapping.")
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fs.StringVar(&cfg.InitialClusterToken, "initial-cluster-token", "etcd-cluster", "Initial cluster token for the etcd cluster during bootstrap.")
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fs.Var(cfg.clusterState, "initial-cluster-state", "Initial cluster state ('new' or 'existing').")
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if err := cfg.clusterState.Set(clusterStateFlagNew); err != nil {
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// Should never happen.
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plog.Panicf("unexpected error setting up clusterStateFlag: %v", err)
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}
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fs.BoolVar(&cfg.StrictReconfigCheck, "strict-reconfig-check", false, "Reject reconfiguration requests that would cause quorum loss.")
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// proxy
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fs.Var(cfg.proxy, "proxy", fmt.Sprintf("Valid values include %s", strings.Join(cfg.proxy.Values, ", ")))
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if err := cfg.proxy.Set(proxyFlagOff); err != nil {
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// Should never happen.
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plog.Panicf("unexpected error setting up proxyFlag: %v", err)
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}
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fs.UintVar(&cfg.ProxyFailureWaitMs, "proxy-failure-wait", 5000, "Time (in milliseconds) an endpoint will be held in a failed state.")
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fs.UintVar(&cfg.ProxyRefreshIntervalMs, "proxy-refresh-interval", 30000, "Time (in milliseconds) of the endpoints refresh interval.")
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fs.UintVar(&cfg.ProxyDialTimeoutMs, "proxy-dial-timeout", 1000, "Time (in milliseconds) for a dial to timeout.")
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fs.UintVar(&cfg.ProxyWriteTimeoutMs, "proxy-write-timeout", 5000, "Time (in milliseconds) for a write to timeout.")
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fs.UintVar(&cfg.ProxyReadTimeoutMs, "proxy-read-timeout", 0, "Time (in milliseconds) for a read to timeout.")
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// security
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fs.StringVar(&cfg.clientTLSInfo.CAFile, "ca-file", "", "DEPRECATED: Path to the client server TLS CA file.")
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fs.StringVar(&cfg.clientTLSInfo.CertFile, "cert-file", "", "Path to the client server TLS cert file.")
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fs.StringVar(&cfg.clientTLSInfo.KeyFile, "key-file", "", "Path to the client server TLS key file.")
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fs.BoolVar(&cfg.clientTLSInfo.ClientCertAuth, "client-cert-auth", false, "Enable client cert authentication.")
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fs.StringVar(&cfg.clientTLSInfo.TrustedCAFile, "trusted-ca-file", "", "Path to the client server TLS trusted CA key file.")
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fs.BoolVar(&cfg.ClientAutoTLS, "auto-tls", false, "Client TLS using generated certificates")
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fs.StringVar(&cfg.peerTLSInfo.CAFile, "peer-ca-file", "", "DEPRECATED: Path to the peer server TLS CA file.")
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fs.StringVar(&cfg.peerTLSInfo.CertFile, "peer-cert-file", "", "Path to the peer server TLS cert file.")
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fs.StringVar(&cfg.peerTLSInfo.KeyFile, "peer-key-file", "", "Path to the peer server TLS key file.")
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fs.BoolVar(&cfg.peerTLSInfo.ClientCertAuth, "peer-client-cert-auth", false, "Enable peer client cert authentication.")
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fs.StringVar(&cfg.peerTLSInfo.TrustedCAFile, "peer-trusted-ca-file", "", "Path to the peer server TLS trusted CA file.")
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fs.BoolVar(&cfg.PeerAutoTLS, "peer-auto-tls", false, "Peer TLS using generated certificates")
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// logging
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fs.BoolVar(&cfg.Debug, "debug", false, "Enable debug-level logging for etcd.")
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fs.StringVar(&cfg.LogPkgLevels, "log-package-levels", "", "Specify a particular log level for each etcd package (eg: 'etcdmain=CRITICAL,etcdserver=DEBUG').")
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// unsafe
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fs.BoolVar(&cfg.ForceNewCluster, "force-new-cluster", false, "Force to create a new one member cluster.")
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// version
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fs.BoolVar(&cfg.printVersion, "version", false, "Print the version and exit.")
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fs.IntVar(&cfg.autoCompactionRetention, "auto-compaction-retention", 0, "Auto compaction retention for mvcc key value store in hour. 0 means disable auto compaction.")
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// pprof profiler via HTTP
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fs.BoolVar(&cfg.enablePprof, "enable-pprof", false, "Enable runtime profiling data via HTTP server. Address is at client URL + \"/debug/pprof\"")
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// ignored
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for _, f := range cfg.ignored {
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fs.Var(&flags.IgnoredFlag{Name: f}, f, "")
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}
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return cfg
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}
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func (cfg *config) Parse(arguments []string) error {
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perr := cfg.FlagSet.Parse(arguments)
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switch perr {
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case nil:
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case flag.ErrHelp:
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fmt.Println(flagsline)
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os.Exit(0)
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default:
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os.Exit(2)
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}
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if len(cfg.FlagSet.Args()) != 0 {
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return fmt.Errorf("'%s' is not a valid flag", cfg.FlagSet.Arg(0))
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}
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if cfg.printVersion {
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fmt.Printf("etcd Version: %s\n", version.Version)
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fmt.Printf("Git SHA: %s\n", version.GitSHA)
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fmt.Printf("Go Version: %s\n", runtime.Version())
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fmt.Printf("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
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os.Exit(0)
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}
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var err error
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if cfg.configFile != "" {
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plog.Infof("Loading server configuration from %q", cfg.configFile)
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err = cfg.configFromFile()
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} else {
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err = cfg.configFromCmdLine()
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}
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return err
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}
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func (cfg *config) configFromCmdLine() error {
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err := flags.SetFlagsFromEnv("ETCD", cfg.FlagSet)
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if err != nil {
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plog.Fatalf("%v", err)
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}
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cfg.lpurls = flags.URLsFromFlag(cfg.FlagSet, "listen-peer-urls")
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cfg.apurls = flags.URLsFromFlag(cfg.FlagSet, "initial-advertise-peer-urls")
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cfg.lcurls = flags.URLsFromFlag(cfg.FlagSet, "listen-client-urls")
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cfg.acurls = flags.URLsFromFlag(cfg.FlagSet, "advertise-client-urls")
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return cfg.validateConfig(func(field string) bool {
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return flags.IsSet(cfg.FlagSet, field)
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})
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}
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func (cfg *config) configFromFile() error {
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b, err := ioutil.ReadFile(cfg.configFile)
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if err != nil {
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return err
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}
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err = yaml.Unmarshal(b, cfg)
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if err != nil {
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return err
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}
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if cfg.LPUrlsCfgFile != "" {
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u, err := types.NewURLs(strings.Split(cfg.LPUrlsCfgFile, ","))
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if err != nil {
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plog.Fatalf("unexpected error setting up listen-peer-urls: %v", err)
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}
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cfg.lpurls = []url.URL(u)
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}
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if cfg.LCUrlsCfgFile != "" {
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u, err := types.NewURLs(strings.Split(cfg.LCUrlsCfgFile, ","))
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if err != nil {
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plog.Fatalf("unexpected error setting up listen-client-urls: %v", err)
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}
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cfg.lcurls = []url.URL(u)
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}
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if cfg.CorsCfgFile != "" {
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if err := cfg.corsInfo.Set(cfg.CorsCfgFile); err != nil {
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plog.Panicf("unexpected error setting up cors: %v", err)
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}
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}
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if cfg.ApurlsCfgFile != "" {
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u, err := types.NewURLs(strings.Split(cfg.ApurlsCfgFile, ","))
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if err != nil {
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plog.Fatalf("unexpected error setting up initial-advertise-peer-urls: %v", err)
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}
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cfg.apurls = []url.URL(u)
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}
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if cfg.AcurlsCfgFile != "" {
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u, err := types.NewURLs(strings.Split(cfg.AcurlsCfgFile, ","))
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if err != nil {
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plog.Fatalf("unexpected error setting up advertise-peer-urls: %v", err)
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}
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cfg.acurls = []url.URL(u)
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}
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if cfg.ClusterStateCfgFile != "" {
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if err := cfg.clusterState.Set(cfg.ClusterStateCfgFile); err != nil {
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plog.Panicf("unexpected error setting up clusterStateFlag: %v", err)
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}
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}
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if cfg.FallbackCfgFile != "" {
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if err := cfg.fallback.Set(cfg.FallbackCfgFile); err != nil {
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plog.Panicf("unexpected error setting up discovery-fallback flag: %v", err)
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}
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}
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if cfg.ProxyCfgFile != "" {
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if err := cfg.proxy.Set(cfg.ProxyCfgFile); err != nil {
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plog.Panicf("unexpected error setting up proxyFlag: %v", err)
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}
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}
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copySecurityDetails := func(tls *transport.TLSInfo, ysc *securityConfig) {
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tls.CAFile = ysc.CAFile
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tls.CertFile = ysc.CertFile
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tls.KeyFile = ysc.KeyFile
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tls.ClientCertAuth = ysc.CertAuth
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tls.TrustedCAFile = ysc.TrustedCAFile
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}
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copySecurityDetails(&cfg.clientTLSInfo, &cfg.ClientSecurityCfgFile)
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copySecurityDetails(&cfg.peerTLSInfo, &cfg.PeerSecurityCfgFile)
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cfg.ClientAutoTLS = cfg.ClientSecurityCfgFile.AutoTLS
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cfg.PeerAutoTLS = cfg.PeerSecurityCfgFile.AutoTLS
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fieldsToBeChecked := map[string]bool{
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"discovery": (cfg.Durl != ""),
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"listen-client-urls": (cfg.LCUrlsCfgFile != ""),
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"advertise-client-urls": (cfg.AcurlsCfgFile != ""),
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"initial-cluster": (cfg.InitialCluster != ""),
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"discovery-srv": (cfg.DnsCluster != ""),
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}
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return cfg.validateConfig(func(field string) bool {
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return fieldsToBeChecked[field]
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})
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}
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func (cfg *config) validateConfig(isSet func(field string) bool) error {
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if err := checkBindURLs(cfg.lpurls); err != nil {
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return err
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}
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if err := checkBindURLs(cfg.lcurls); err != nil {
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return err
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}
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// when etcd runs in member mode user needs to set --advertise-client-urls if --listen-client-urls is set.
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// TODO(yichengq): check this for joining through discovery service case
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mayFallbackToProxy := isSet("discovery") && cfg.fallback.String() == fallbackFlagProxy
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mayBeProxy := cfg.proxy.String() != proxyFlagOff || mayFallbackToProxy
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if !mayBeProxy {
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if isSet("listen-client-urls") && !isSet("advertise-client-urls") {
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return errUnsetAdvertiseClientURLsFlag
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}
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}
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// Check if conflicting flags are passed.
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nSet := 0
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for _, v := range []bool{isSet("discovery"), isSet("initial-cluster"), isSet("discovery-srv")} {
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if v {
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nSet += 1
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}
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}
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if nSet > 1 {
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return ErrConflictBootstrapFlags
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}
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if 5*cfg.TickMs > cfg.ElectionMs {
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return fmt.Errorf("--election-timeout[%vms] should be at least as 5 times as --heartbeat-interval[%vms]", cfg.ElectionMs, cfg.TickMs)
|
|
}
|
|
if cfg.ElectionMs > maxElectionMs {
|
|
return fmt.Errorf("--election-timeout[%vms] is too long, and should be set less than %vms", cfg.ElectionMs, maxElectionMs)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func initialClusterFromName(name string) string {
|
|
n := name
|
|
if name == "" {
|
|
n = defaultName
|
|
}
|
|
return fmt.Sprintf("%s=http://localhost:2380", n)
|
|
}
|
|
|
|
func (cfg config) isNewCluster() bool { return cfg.clusterState.String() == clusterStateFlagNew }
|
|
func (cfg config) isProxy() bool { return cfg.proxy.String() != proxyFlagOff }
|
|
func (cfg config) isReadonlyProxy() bool { return cfg.proxy.String() == proxyFlagReadonly }
|
|
func (cfg config) shouldFallbackToProxy() bool { return cfg.fallback.String() == fallbackFlagProxy }
|
|
|
|
func (cfg config) electionTicks() int { return int(cfg.ElectionMs / cfg.TickMs) }
|
|
|
|
// checkBindURLs returns an error if any URL uses a domain name.
|
|
// TODO: return error in 3.2.0
|
|
func checkBindURLs(urls []url.URL) error {
|
|
for _, url := range urls {
|
|
if url.Scheme == "unix" || url.Scheme == "unixs" {
|
|
continue
|
|
}
|
|
host, _, err := net.SplitHostPort(url.Host)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if host == "localhost" {
|
|
// special case for local address
|
|
// TODO: support /etc/hosts ?
|
|
continue
|
|
}
|
|
if net.ParseIP(host) == nil {
|
|
err := fmt.Errorf("expected IP in URL for binding (%s)", url.String())
|
|
plog.Warning(err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|