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fleetd.go
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fleetd.go
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// Copyright 2014 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 main
import (
"encoding/json"
"flag"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/coreos/fleet/Godeps/_workspace/src/github.com/rakyll/globalconf"
"github.com/coreos/fleet/agent"
"github.com/coreos/fleet/config"
"github.com/coreos/fleet/log"
"github.com/coreos/fleet/pkg"
"github.com/coreos/fleet/registry"
"github.com/coreos/fleet/server"
"github.com/coreos/fleet/version"
)
const (
DefaultConfigFile = "/etc/fleet/fleet.conf"
)
func main() {
userset := flag.NewFlagSet("fleet", flag.ExitOnError)
printVersion := userset.Bool("version", false, "Print the version and exit")
cfgPath := userset.String("config", "", fmt.Sprintf("Path to config file. Fleet will look for a config at %s by default.", DefaultConfigFile))
err := userset.Parse(os.Args[1:])
if err == flag.ErrHelp {
userset.Usage()
os.Exit(1)
}
args := userset.Args()
if len(args) == 1 && args[0] == "version" {
*printVersion = true
} else if len(args) != 0 {
userset.Usage()
os.Exit(1)
}
if *printVersion {
fmt.Println("fleetd version", version.Version)
os.Exit(0)
}
log.Infof("Starting fleetd version %v", version.Version)
cfgset := flag.NewFlagSet("fleet", flag.ExitOnError)
cfgset.Int("verbosity", 0, "Logging level")
cfgset.Var(&pkg.StringSlice{"http://127.0.0.1:2379", "http://127.0.0.1:4001"}, "etcd_servers", "List of etcd endpoints")
cfgset.String("etcd_keyfile", "", "SSL key file used to secure etcd communication")
cfgset.String("etcd_certfile", "", "SSL certification file used to secure etcd communication")
cfgset.String("etcd_cafile", "", "SSL Certificate Authority file used to secure etcd communication")
cfgset.String("etcd_key_prefix", registry.DefaultKeyPrefix, "Keyspace for fleet data in etcd")
cfgset.Float64("etcd_request_timeout", 1.0, "Amount of time in seconds to allow a single etcd request before considering it failed.")
cfgset.Float64("engine_reconcile_interval", 2.0, "Interval at which the engine should reconcile the cluster schedule in etcd.")
cfgset.String("public_ip", "", "IP address that fleet machine should publish")
cfgset.String("metadata", "", "List of key-value metadata to assign to the fleet machine")
cfgset.String("agent_ttl", agent.DefaultTTL, "TTL in seconds of fleet machine state in etcd")
cfgset.Bool("verify_units", false, "DEPRECATED - This option is ignored")
cfgset.String("authorized_keys_file", "", "DEPRECATED - This option is ignored")
globalconf.Register("", cfgset)
cfg, err := getConfig(cfgset, *cfgPath)
if err != nil {
log.Fatalf(err.Error())
}
log.Debugf("Creating Server")
srv, err := server.New(*cfg)
if err != nil {
log.Fatalf("Failed creating Server: %v", err.Error())
}
srv.Run()
reconfigure := func() {
log.Infof("Reloading configuration from %s", *cfgPath)
cfg, err := getConfig(cfgset, *cfgPath)
if err != nil {
log.Fatalf(err.Error())
}
log.Infof("Restarting server components")
srv.Stop()
srv, err = server.New(*cfg)
if err != nil {
log.Fatalf(err.Error())
}
srv.Run()
}
shutdown := func() {
log.Infof("Gracefully shutting down")
srv.Stop()
srv.Purge()
os.Exit(0)
}
writeState := func() {
log.Infof("Dumping server state")
encoded, err := json.Marshal(srv)
if err != nil {
log.Errorf("Failed to dump server state: %v", err)
return
}
if _, err := os.Stdout.Write(encoded); err != nil {
log.Errorf("Failed to dump server state: %v", err)
return
}
os.Stdout.Write([]byte("\n"))
log.Debugf("Finished dumping server state")
}
signals := map[os.Signal]func(){
syscall.SIGHUP: reconfigure,
syscall.SIGTERM: shutdown,
syscall.SIGINT: shutdown,
syscall.SIGUSR1: writeState,
}
listenForSignals(signals)
}
func getConfig(flagset *flag.FlagSet, userCfgFile string) (*config.Config, error) {
opts := globalconf.Options{EnvPrefix: "FLEET_"}
if userCfgFile != "" {
// Fail hard if a user-provided config is not usable
fi, err := os.Stat(userCfgFile)
if err != nil {
log.Fatalf("Unable to use config file %s: %v", userCfgFile, err)
}
if fi.IsDir() {
log.Fatalf("Provided config %s is a directory, not a file", userCfgFile)
}
log.Infof("Using provided config file %s", userCfgFile)
opts.Filename = userCfgFile
} else if _, err := os.Stat(DefaultConfigFile); err == nil {
log.Infof("Using default config file %s", DefaultConfigFile)
opts.Filename = DefaultConfigFile
} else {
log.Infof("No provided or default config file found - proceeding without")
}
gconf, err := globalconf.NewWithOptions(&opts)
if err != nil {
return nil, err
}
gconf.ParseSet("", flagset)
cfg := config.Config{
Verbosity: (*flagset.Lookup("verbosity")).Value.(flag.Getter).Get().(int),
EtcdServers: (*flagset.Lookup("etcd_servers")).Value.(flag.Getter).Get().(pkg.StringSlice),
EtcdKeyPrefix: (*flagset.Lookup("etcd_key_prefix")).Value.(flag.Getter).Get().(string),
EtcdKeyFile: (*flagset.Lookup("etcd_keyfile")).Value.(flag.Getter).Get().(string),
EtcdCertFile: (*flagset.Lookup("etcd_certfile")).Value.(flag.Getter).Get().(string),
EtcdCAFile: (*flagset.Lookup("etcd_cafile")).Value.(flag.Getter).Get().(string),
EtcdRequestTimeout: (*flagset.Lookup("etcd_request_timeout")).Value.(flag.Getter).Get().(float64),
EngineReconcileInterval: (*flagset.Lookup("engine_reconcile_interval")).Value.(flag.Getter).Get().(float64),
PublicIP: (*flagset.Lookup("public_ip")).Value.(flag.Getter).Get().(string),
RawMetadata: (*flagset.Lookup("metadata")).Value.(flag.Getter).Get().(string),
AgentTTL: (*flagset.Lookup("agent_ttl")).Value.(flag.Getter).Get().(string),
VerifyUnits: (*flagset.Lookup("verify_units")).Value.(flag.Getter).Get().(bool),
AuthorizedKeysFile: (*flagset.Lookup("authorized_keys_file")).Value.(flag.Getter).Get().(string),
}
if cfg.VerifyUnits {
log.Error("Config option verify_units is no longer supported - ignoring")
}
if len(cfg.AuthorizedKeysFile) > 0 {
log.Error("Config option authorized_keys_file is no longer supported - ignoring")
}
if cfg.Verbosity > 0 {
log.EnableDebug()
}
return &cfg, nil
}
func listenForSignals(sigmap map[os.Signal]func()) {
sigchan := make(chan os.Signal, 1)
for k := range sigmap {
signal.Notify(sigchan, k)
}
for true {
sig := <-sigchan
handler, ok := sigmap[sig]
if ok {
handler()
}
}
}