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config.go
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config.go
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// Copyright 2015 CoreOS, Inc.
//
// 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 (
"flag"
"fmt"
"net/url"
"os"
"runtime"
"strings"
"github.com/coreos/etcd/etcdserver"
"github.com/coreos/etcd/pkg/cors"
"github.com/coreos/etcd/pkg/flags"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/version"
)
const (
proxyFlagOff = "off"
proxyFlagReadonly = "readonly"
proxyFlagOn = "on"
fallbackFlagExit = "exit"
fallbackFlagProxy = "proxy"
clusterStateFlagNew = "new"
clusterStateFlagExisting = "existing"
defaultName = "default"
)
var (
ignored = []string{
"cluster-active-size",
"cluster-remove-delay",
"cluster-sync-interval",
"config",
"force",
"max-result-buffer",
"max-retry-attempts",
"peer-heartbeat-interval",
"peer-election-timeout",
"retry-interval",
"snapshot",
"v",
"vv",
}
ErrConflictBootstrapFlags = fmt.Errorf("multiple discovery or bootstrap flags are set" +
"Choose one of \"initial-cluster\", \"discovery\" or \"discovery-srv\"")
errUnsetAdvertiseClientURLsFlag = fmt.Errorf("-advertise-client-urls is required when -listen-client-urls is set explicitly")
)
type config struct {
*flag.FlagSet
// member
corsInfo *cors.CORSInfo
dir string
lpurls, lcurls []url.URL
maxSnapFiles uint
maxWalFiles uint
name string
snapCount uint64
// TODO: decouple tickMs and heartbeat tick (current heartbeat tick = 1).
// make ticks a cluster wide configuration.
TickMs uint
ElectionMs uint
// clustering
apurls, acurls []url.URL
clusterState *flags.StringsFlag
dnsCluster string
dproxy string
durl string
fallback *flags.StringsFlag
initialCluster string
initialClusterToken string
// proxy
proxy *flags.StringsFlag
// security
clientTLSInfo, peerTLSInfo transport.TLSInfo
// logging
debug bool
logPkgLevels string
// unsafe
forceNewCluster bool
printVersion bool
ignored []string
}
func NewConfig() *config {
cfg := &config{
corsInfo: &cors.CORSInfo{},
clusterState: flags.NewStringsFlag(
clusterStateFlagNew,
clusterStateFlagExisting,
),
fallback: flags.NewStringsFlag(
fallbackFlagExit,
fallbackFlagProxy,
),
ignored: ignored,
proxy: flags.NewStringsFlag(
proxyFlagOff,
proxyFlagReadonly,
proxyFlagOn,
),
}
cfg.FlagSet = flag.NewFlagSet("etcd", flag.ContinueOnError)
fs := cfg.FlagSet
fs.Usage = func() {
fmt.Println(usageline)
fmt.Println(flagsline)
}
// member
fs.Var(cfg.corsInfo, "cors", "Comma-separated white list of origins for CORS (cross-origin resource sharing).")
fs.StringVar(&cfg.dir, "data-dir", "", "Path to the data directory")
fs.Var(flags.NewURLsValue("http://localhost:2380,http://localhost:7001"), "listen-peer-urls", "List of URLs to listen on for peer traffic")
fs.Var(flags.NewURLsValue("http://localhost:2379,http://localhost:4001"), "listen-client-urls", "List of URLs to listen on for client traffic")
fs.UintVar(&cfg.maxSnapFiles, "max-snapshots", defaultMaxSnapshots, "Maximum number of snapshot files to retain (0 is unlimited)")
fs.UintVar(&cfg.maxWalFiles, "max-wals", defaultMaxWALs, "Maximum number of wal files to retain (0 is unlimited)")
fs.StringVar(&cfg.name, "name", defaultName, "Unique human-readable name for this node")
fs.Uint64Var(&cfg.snapCount, "snapshot-count", etcdserver.DefaultSnapCount, "Number of committed transactions to trigger a snapshot")
fs.UintVar(&cfg.TickMs, "heartbeat-interval", 100, "Time (in milliseconds) of a heartbeat interval.")
fs.UintVar(&cfg.ElectionMs, "election-timeout", 1000, "Time (in milliseconds) for an election to timeout.")
// clustering
fs.Var(flags.NewURLsValue("http://localhost:2380,http://localhost:7001"), "initial-advertise-peer-urls", "List of this member's peer URLs to advertise to the rest of the cluster")
fs.Var(flags.NewURLsValue("http://localhost:2379,http://localhost:4001"), "advertise-client-urls", "List of this member's client URLs to advertise to the rest of the cluster")
fs.StringVar(&cfg.durl, "discovery", "", "Discovery service used to bootstrap the initial cluster")
fs.Var(cfg.fallback, "discovery-fallback", fmt.Sprintf("Valid values include %s", strings.Join(cfg.fallback.Values, ", ")))
if err := cfg.fallback.Set(fallbackFlagProxy); err != nil {
// Should never happen.
plog.Panicf("unexpected error setting up discovery-fallback flag: %v", err)
}
fs.StringVar(&cfg.dproxy, "discovery-proxy", "", "HTTP proxy to use for traffic to discovery service")
fs.StringVar(&cfg.dnsCluster, "discovery-srv", "", "DNS domain used to bootstrap initial cluster")
fs.StringVar(&cfg.initialCluster, "initial-cluster", initialClusterFromName(defaultName), "Initial cluster configuration for bootstrapping")
fs.StringVar(&cfg.initialClusterToken, "initial-cluster-token", "etcd-cluster", "Initial cluster token for the etcd cluster during bootstrap")
fs.Var(cfg.clusterState, "initial-cluster-state", "Initial cluster configuration for bootstrapping")
if err := cfg.clusterState.Set(clusterStateFlagNew); err != nil {
// Should never happen.
plog.Panicf("unexpected error setting up clusterStateFlag: %v", err)
}
// proxy
fs.Var(cfg.proxy, "proxy", fmt.Sprintf("Valid values include %s", strings.Join(cfg.proxy.Values, ", ")))
if err := cfg.proxy.Set(proxyFlagOff); err != nil {
// Should never happen.
plog.Panicf("unexpected error setting up proxyFlag: %v", err)
}
// security
fs.StringVar(&cfg.clientTLSInfo.CAFile, "ca-file", "", "DEPRECATED: Path to the client server TLS CA file.")
fs.StringVar(&cfg.clientTLSInfo.CertFile, "cert-file", "", "Path to the client server TLS cert file.")
fs.StringVar(&cfg.clientTLSInfo.KeyFile, "key-file", "", "Path to the client server TLS key file.")
fs.BoolVar(&cfg.clientTLSInfo.ClientCertAuth, "client-cert-auth", false, "Enable client cert authentication.")
fs.StringVar(&cfg.clientTLSInfo.TrustedCAFile, "trusted-ca-file", "", "Path to the client server TLS trusted CA key file.")
fs.StringVar(&cfg.peerTLSInfo.CAFile, "peer-ca-file", "", "DEPRECATED: Path to the peer server TLS CA file.")
fs.StringVar(&cfg.peerTLSInfo.CertFile, "peer-cert-file", "", "Path to the peer server TLS cert file.")
fs.StringVar(&cfg.peerTLSInfo.KeyFile, "peer-key-file", "", "Path to the peer server TLS key file.")
fs.BoolVar(&cfg.peerTLSInfo.ClientCertAuth, "peer-client-cert-auth", false, "Enable peer client cert authentication.")
fs.StringVar(&cfg.peerTLSInfo.TrustedCAFile, "peer-trusted-ca-file", "", "Path to the peer server TLS trusted CA file.")
// logging
fs.BoolVar(&cfg.debug, "debug", false, "Enable debug output to the logs.")
fs.StringVar(&cfg.logPkgLevels, "log-package-levels", "", "Specify a particular log level for each etcd package.")
// unsafe
fs.BoolVar(&cfg.forceNewCluster, "force-new-cluster", false, "Force to create a new one member cluster")
// version
fs.BoolVar(&cfg.printVersion, "version", false, "Print the version and exit")
// backwards-compatibility with v0.4.6
fs.Var(&flags.IPAddressPort{}, "addr", "DEPRECATED: Use -advertise-client-urls instead.")
fs.Var(&flags.IPAddressPort{}, "bind-addr", "DEPRECATED: Use -listen-client-urls instead.")
fs.Var(&flags.IPAddressPort{}, "peer-addr", "DEPRECATED: Use -initial-advertise-peer-urls instead.")
fs.Var(&flags.IPAddressPort{}, "peer-bind-addr", "DEPRECATED: Use -listen-peer-urls instead.")
fs.Var(&flags.DeprecatedFlag{Name: "peers"}, "peers", "DEPRECATED: Use -initial-cluster instead")
fs.Var(&flags.DeprecatedFlag{Name: "peers-file"}, "peers-file", "DEPRECATED: Use -initial-cluster instead")
// ignored
for _, f := range cfg.ignored {
fs.Var(&flags.IgnoredFlag{Name: f}, f, "")
}
return cfg
}
func (cfg *config) Parse(arguments []string) error {
perr := cfg.FlagSet.Parse(arguments)
switch perr {
case nil:
case flag.ErrHelp:
os.Exit(0)
default:
os.Exit(2)
}
if len(cfg.FlagSet.Args()) != 0 {
return fmt.Errorf("'%s' is not a valid flag", cfg.FlagSet.Arg(0))
}
if cfg.printVersion {
fmt.Printf("etcd Version: %s\n", version.Version)
fmt.Printf("Git SHA: %s\n", version.GitSHA)
fmt.Printf("Go Version: %s\n", runtime.Version())
fmt.Printf("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
os.Exit(0)
}
err := flags.SetFlagsFromEnv(cfg.FlagSet)
if err != nil {
plog.Fatalf("%v", err)
}
set := make(map[string]bool)
cfg.FlagSet.Visit(func(f *flag.Flag) {
set[f.Name] = true
})
nSet := 0
for _, v := range []bool{set["discovery"], set["initial-cluster"], set["discovery-srv"]} {
if v {
nSet += 1
}
}
if nSet > 1 {
return ErrConflictBootstrapFlags
}
flags.SetBindAddrFromAddr(cfg.FlagSet, "peer-bind-addr", "peer-addr")
flags.SetBindAddrFromAddr(cfg.FlagSet, "bind-addr", "addr")
cfg.lpurls, err = flags.URLsFromFlags(cfg.FlagSet, "listen-peer-urls", "peer-bind-addr", cfg.peerTLSInfo)
if err != nil {
return err
}
cfg.apurls, err = flags.URLsFromFlags(cfg.FlagSet, "initial-advertise-peer-urls", "peer-addr", cfg.peerTLSInfo)
if err != nil {
return err
}
cfg.lcurls, err = flags.URLsFromFlags(cfg.FlagSet, "listen-client-urls", "bind-addr", cfg.clientTLSInfo)
if err != nil {
return err
}
cfg.acurls, err = flags.URLsFromFlags(cfg.FlagSet, "advertise-client-urls", "addr", cfg.clientTLSInfo)
if err != nil {
return err
}
// when etcd runs in member mode user needs to set -advertise-client-urls if -listen-client-urls is set.
if cfg.proxy.String() != proxyFlagOn {
if flags.IsSet(cfg.FlagSet, "listen-client-urls") && !flags.IsSet(cfg.FlagSet, "advertise-client-urls") {
return errUnsetAdvertiseClientURLsFlag
}
}
if 5*cfg.TickMs > cfg.ElectionMs {
return fmt.Errorf("-election-timeout[%vms] should be at least as 5 times as -heartbeat-interval[%vms]", cfg.ElectionMs, cfg.TickMs)
}
return nil
}
func initialClusterFromName(name string) string {
n := name
if name == "" {
n = defaultName
}
return fmt.Sprintf("%s=http://localhost:2380,%s=http://localhost:7001", n, 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) }