func main() {
hostname, _ := os.Hostname()
externalAddr := flag.String("external", "", "external IP of host")
bindAddr := flag.String("bind", "", "bind containers to this IP")
configFile := flag.String("config", "", "configuration file")
manifestFile := flag.String("manifest", "/etc/flynn-host.json", "manifest file")
stateFile := flag.String("state", "", "state file")
hostID := flag.String("id", strings.Replace(hostname, "-", "", -1), "host id")
force := flag.Bool("force", false, "kill all containers booted by flynn-host before starting")
volPath := flag.String("volpath", "/var/lib/flynn-host", "directory to create volumes in")
backendName := flag.String("backend", "libvirt-lxc", "runner backend (docker or libvirt-lxc)")
flynnInit := flag.String("flynn-init", "/usr/bin/flynn-init", "path to flynn-init binary")
metadata := make(MetaFlag)
flag.Var(&metadata, "meta", "key=value pair to add as metadata")
flag.Parse()
grohl.AddContext("app", "host")
grohl.Log(grohl.Data{"at": "start"})
g := grohl.NewContext(grohl.Data{"fn": "main"})
if strings.Contains(*hostID, "-") {
log.Fatal("host id must not contain dashes")
}
portAlloc := map[string]*ports.Allocator{
"tcp": ports.NewAllocator(55000, 65535),
"udp": ports.NewAllocator(55000, 65535),
}
sh := newShutdownHandler()
state := NewState()
var backend Backend
var err error
switch *backendName {
case "libvirt-lxc":
backend, err = NewLibvirtLXCBackend(state, portAlloc, *volPath, "/tmp/flynn-host-logs", *flynnInit)
case "docker":
backend, err = NewDockerBackend(state, portAlloc, *bindAddr)
default:
log.Fatalf("unknown backend %q", *backendName)
}
if err != nil {
sh.Fatal(err)
}
if err := serveHTTP(&Host{state: state, backend: backend}, &attachHandler{state: state, backend: backend}, sh); err != nil {
sh.Fatal(err)
}
if *stateFile != "" {
sh.BeforeExit(func() { os.Remove(*stateFile) })
if err := state.Restore(*stateFile, backend); err != nil {
sh.Fatal(err)
}
}
sh.BeforeExit(func() { backend.Cleanup() })
if *force {
if err := backend.Cleanup(); err != nil {
sh.Fatal(err)
}
}
runner := &manifestRunner{
env: parseEnviron(),
externalAddr: *externalAddr,
bindAddr: *bindAddr,
backend: backend,
state: state,
ports: portAlloc,
}
discAddr := os.Getenv("DISCOVERD")
var disc *discoverd.Client
if *manifestFile != "" {
var r io.Reader
var f *os.File
if *manifestFile == "-" {
r = os.Stdin
} else {
f, err = os.Open(*manifestFile)
if err != nil {
sh.Fatal(err)
}
r = f
}
services, err := runner.runManifest(r)
if err != nil {
sh.Fatal(err)
}
if f != nil {
f.Close()
}
if d, ok := services["discoverd"]; ok {
discAddr = fmt.Sprintf("%s:%d", d.InternalIP, d.TCPPorts[0])
var disc *discoverd.Client
err = Attempts.Run(func() (err error) {
disc, err = discoverd.NewClientWithAddr(discAddr)
return
})
if err != nil {
sh.Fatal(err)
}
}
}
if discAddr == "" && *externalAddr != "" {
discAddr = *externalAddr + ":1111"
}
// HACK: use env as global for discoverd connection in sampic
os.Setenv("DISCOVERD", discAddr)
if disc == nil {
disc, err = discoverd.NewClientWithAddr(discAddr)
if err != nil {
sh.Fatal(err)
}
}
sh.BeforeExit(func() { disc.UnregisterAll() })
sampiStandby, err := disc.RegisterAndStandby("flynn-host", *externalAddr+":1113", map[string]string{"id": *hostID})
if err != nil {
sh.Fatal(err)
}
// Check if we are the leader so that we can use the cluster functions directly
sampiCluster := sampi.NewCluster(sampi.NewState())
select {
case <-sampiStandby:
g.Log(grohl.Data{"at": "sampi_leader"})
rpc.Register(sampiCluster)
case <-time.After(5 * time.Millisecond):
go func() {
<-sampiStandby
g.Log(grohl.Data{"at": "sampi_leader"})
rpc.Register(sampiCluster)
}()
}
cluster, err := cluster.NewClientWithSelf(*hostID, NewLocalClient(*hostID, sampiCluster))
if err != nil {
sh.Fatal(err)
}
sh.BeforeExit(func() { cluster.Close() })
g.Log(grohl.Data{"at": "sampi_connected"})
events := state.AddListener("all")
go syncScheduler(cluster, events)
h := &host.Host{}
if *configFile != "" {
h, err = openConfig(*configFile)
if err != nil {
sh.Fatal(err)
}
}
if h.Metadata == nil {
h.Metadata = make(map[string]string)
}
for k, v := range metadata {
h.Metadata[k] = v
}
h.ID = *hostID
for {
newLeader := cluster.NewLeaderSignal()
h.Jobs = state.ClusterJobs()
jobs := make(chan *host.Job)
hostErr := cluster.RegisterHost(h, jobs)
g.Log(grohl.Data{"at": "host_registered"})
for job := range jobs {
if *externalAddr != "" {
if job.Config.Env == nil {
job.Config.Env = make(map[string]string)
}
job.Config.Env["EXTERNAL_IP"] = *externalAddr
job.Config.Env["DISCOVERD"] = discAddr
}
if err := backend.Run(job); err != nil {
state.SetStatusFailed(job.ID, err)
}
}
g.Log(grohl.Data{"at": "sampi_disconnected", "err": *hostErr})
<-newLeader
}
}
func runDaemon(args *docopt.Args) {
hostname, _ := os.Hostname()
externalAddr := args.String["--external"]
bindAddr := args.String["--bind"]
configFile := args.String["--config"]
manifestFile := args.String["--manifest"]
stateFile := args.String["--state"]
hostID := args.String["--id"]
force := args.Bool["--force"]
volPath := args.String["--volpath"]
backendName := args.String["--backend"]
flynnInit := args.String["--flynn-init"]
metadata := args.All["--meta"].([]string)
grohl.AddContext("app", "host")
grohl.Log(grohl.Data{"at": "start"})
g := grohl.NewContext(grohl.Data{"fn": "main"})
if hostID == "" {
hostID = strings.Replace(hostname, "-", "", -1)
}
if strings.Contains(hostID, "-") {
log.Fatal("host id must not contain dashes")
}
portAlloc := map[string]*ports.Allocator{
"tcp": ports.NewAllocator(55000, 65535),
"udp": ports.NewAllocator(55000, 65535),
}
sh := newShutdownHandler()
state := NewState()
var backend Backend
var err error
switch backendName {
case "libvirt-lxc":
backend, err = NewLibvirtLXCBackend(state, portAlloc, volPath, "/tmp/flynn-host-logs", flynnInit)
case "docker":
backend, err = NewDockerBackend(state, portAlloc, bindAddr)
default:
log.Fatalf("unknown backend %q", backendName)
}
if err != nil {
sh.Fatal(err)
}
if err := serveHTTP(&Host{state: state, backend: backend}, &attachHandler{state: state, backend: backend}, sh); err != nil {
sh.Fatal(err)
}
if stateFile != "" {
if err := state.Restore(stateFile, backend); err != nil {
sh.Fatal(err)
}
}
var jobStream cluster.Stream
sh.BeforeExit(func() {
if jobStream != nil {
jobStream.Close()
}
backend.Cleanup()
})
if force {
if err := backend.Cleanup(); err != nil {
sh.Fatal(err)
}
}
runner := &manifestRunner{
env: parseEnviron(),
externalAddr: externalAddr,
bindAddr: bindAddr,
backend: backend,
state: state,
ports: portAlloc,
}
discAddr := os.Getenv("DISCOVERD")
var disc *discoverd.Client
if manifestFile != "" {
var r io.Reader
var f *os.File
if manifestFile == "-" {
r = os.Stdin
} else {
f, err = os.Open(manifestFile)
if err != nil {
sh.Fatal(err)
}
r = f
}
services, err := runner.runManifest(r)
if err != nil {
sh.Fatal(err)
}
if f != nil {
f.Close()
}
if d, ok := services["discoverd"]; ok {
discAddr = fmt.Sprintf("%s:%d", d.InternalIP, d.TCPPorts[0])
var disc *discoverd.Client
err = Attempts.Run(func() (err error) {
disc, err = discoverd.NewClientWithAddr(discAddr)
return
})
if err != nil {
sh.Fatal(err)
}
}
}
if discAddr == "" && externalAddr != "" {
discAddr = externalAddr + ":1111"
}
// HACK: use env as global for discoverd connection in sampic
os.Setenv("DISCOVERD", discAddr)
if disc == nil {
disc, err = discoverd.NewClientWithAddr(discAddr)
if err != nil {
sh.Fatal(err)
}
}
sh.BeforeExit(func() { disc.UnregisterAll() })
sampiStandby, err := disc.RegisterAndStandby("flynn-host", externalAddr+":1113", map[string]string{"id": hostID})
if err != nil {
sh.Fatal(err)
}
// Check if we are the leader so that we can use the cluster functions directly
sampiCluster := sampi.NewCluster(sampi.NewState())
select {
case <-sampiStandby:
g.Log(grohl.Data{"at": "sampi_leader"})
rpc.Register(sampiCluster)
case <-time.After(5 * time.Millisecond):
go func() {
<-sampiStandby
g.Log(grohl.Data{"at": "sampi_leader"})
rpc.Register(sampiCluster)
}()
}
cluster, err := cluster.NewClientWithSelf(hostID, NewLocalClient(hostID, sampiCluster))
if err != nil {
sh.Fatal(err)
}
sh.BeforeExit(func() { cluster.Close() })
g.Log(grohl.Data{"at": "sampi_connected"})
events := state.AddListener("all")
go syncScheduler(cluster, events)
h := &host.Host{}
if configFile != "" {
h, err = openConfig(configFile)
if err != nil {
sh.Fatal(err)
}
}
if h.Metadata == nil {
h.Metadata = make(map[string]string)
}
for _, s := range metadata {
kv := strings.SplitN(s, "=", 2)
h.Metadata[kv[0]] = kv[1]
}
h.ID = hostID
for {
newLeader := cluster.NewLeaderSignal()
h.Jobs = state.ClusterJobs()
jobs := make(chan *host.Job)
jobStream = cluster.RegisterHost(h, jobs)
g.Log(grohl.Data{"at": "host_registered"})
for job := range jobs {
if externalAddr != "" {
if job.Config.Env == nil {
job.Config.Env = make(map[string]string)
}
job.Config.Env["EXTERNAL_IP"] = externalAddr
job.Config.Env["DISCOVERD"] = discAddr
}
if err := backend.Run(job); err != nil {
state.SetStatusFailed(job.ID, err)
}
}
g.Log(grohl.Data{"at": "sampi_disconnected", "err": jobStream.Err})
// if the process is shutting down, just block
if sh.Active {
<-make(chan struct{})
}
<-newLeader
}
}