func activateIfNeeded() error {
// Don't start a full daemon, we just need DB access
d := &Daemon{
IsMock: false,
imagesDownloading: map[string]chan bool{},
imagesDownloadingLock: sync.RWMutex{},
}
err := initializeDbObject(d, shared.VarPath("lxd.db"))
if err != nil {
return err
}
// Look for network socket
value, err := d.ConfigValueGet("core.https_address")
if err != nil {
return err
}
if value != "" {
shared.Debugf("Daemon has core.https_address set, activating...")
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
return err
}
// Look for auto-started or previously started containers
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
return err
}
result, err := dbContainersList(d.db, cTypeRegular)
if err != nil {
return err
}
for _, name := range result {
c, err := containerLoadByName(d, name)
if err != nil {
return err
}
config := c.ExpandedConfig()
lastState := config["volatile.last_state.power"]
autoStart := config["boot.autostart"]
if lastState == "RUNNING" || lastState == "Running" || autoStart == "true" {
shared.Debugf("Daemon has auto-started containers, activating...")
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
return err
}
}
shared.Debugf("No need to start the daemon now.")
return nil
}
func showDefaultMap() {
set, err := shared.DefaultIdmapSet()
if err != nil {
fmt.Printf("Error reading default mapset: %q\n", err)
help(1)
}
fmt.Printf("Your current default allocation is:\n\n")
for _, m := range set.Idmap {
t := "uid"
if !m.Isuid {
t = "gid"
}
hmin := m.Hostid
hmax := m.Hostid + m.Maprange - 1
cmin := m.Nsid
cmax := m.Nsid + m.Maprange - 1
fmt.Printf("host %s %d - %d mapping to %d - %d in container\n",
t, hmin, hmax, cmin, cmax)
}
}
func (d *Daemon) Init() error {
d.shutdownChan = make(chan bool)
/* Set the executable path */
absPath, err := os.Readlink("/proc/self/exe")
if err != nil {
return err
}
d.execPath = absPath
/* Set the LVM environment */
err = os.Setenv("LVM_SUPPRESS_FD_WARNINGS", "1")
if err != nil {
return err
}
/* Setup logging if that wasn't done before */
if shared.Log == nil {
shared.Log, err = logging.GetLogger("", "", true, true, nil)
if err != nil {
return err
}
}
if !d.IsMock {
shared.Log.Info("LXD is starting",
log.Ctx{"path": shared.VarPath("")})
} else {
shared.Log.Info("Mock LXD is starting",
log.Ctx{"path": shared.VarPath("")})
}
/* Detect user namespaces */
runningInUserns = shared.RunningInUserNS()
/* Detect AppArmor support */
if aaAvailable && os.Getenv("LXD_SECURITY_APPARMOR") == "false" {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been manually disabled")
}
if aaAvailable && !shared.IsDir("/sys/kernel/security/apparmor") {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been disabled because of lack of kernel support")
}
_, err = exec.LookPath("apparmor_parser")
if aaAvailable && err != nil {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been disabled because 'apparmor_parser' couldn't be found")
}
/* Detect AppArmor admin support */
if aaAdmin && !haveMacAdmin() {
aaAdmin = false
shared.Log.Warn("Per-container AppArmor profiles are disabled because the mac_admin capability is missing.")
}
if aaAdmin && runningInUserns {
aaAdmin = false
shared.Log.Warn("Per-container AppArmor profiles are disabled because LXD is running in an unprivileged container.")
}
/* Detect AppArmor confinment */
if !aaConfined {
profile := aaProfile()
if profile != "unconfined" && profile != "" {
aaConfined = true
shared.Log.Warn("Per-container AppArmor profiles are disabled because LXD is already protected by AppArmor.")
}
}
/* Detect CGroup support */
cgCpuController = shared.PathExists("/sys/fs/cgroup/cpu/")
if !cgCpuController {
shared.Log.Warn("Couldn't find the CGroup CPU controller, CPU time limits will be ignored.")
}
cgCpusetController = shared.PathExists("/sys/fs/cgroup/cpuset/")
if !cgCpusetController {
shared.Log.Warn("Couldn't find the CGroup CPUset controller, CPU pinning will be ignored.")
}
cgMemoryController = shared.PathExists("/sys/fs/cgroup/memory/")
if !cgMemoryController {
shared.Log.Warn("Couldn't find the CGroup memory controller, memory limits will be ignored.")
}
cgSwapAccounting = shared.PathExists("/sys/fs/cgroup/memory/memory.memsw.limit_in_bytes")
if !cgSwapAccounting {
shared.Log.Warn("CGroup memory swap accounting is disabled, swap limits will be ignored.")
}
/* Get the list of supported architectures */
var architectures = []int{}
uname := syscall.Utsname{}
if err := syscall.Uname(&uname); err != nil {
return err
}
architectureName := ""
for _, c := range uname.Machine {
if c == 0 {
break
}
architectureName += string(byte(c))
}
architecture, err := shared.ArchitectureId(architectureName)
if err != nil {
return err
}
architectures = append(architectures, architecture)
personalities, err := shared.ArchitecturePersonalities(architecture)
if err != nil {
return err
}
for _, personality := range personalities {
architectures = append(architectures, personality)
}
d.architectures = architectures
/* Set container path */
d.lxcpath = shared.VarPath("containers")
/* Make sure all our directories are available */
if err := os.MkdirAll(shared.VarPath("containers"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("devices"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("security"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("shmounts"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
return err
}
/* Detect the filesystem */
d.BackingFs, err = filesystemDetect(d.lxcpath)
if err != nil {
shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
}
/* Read the uid/gid allocation */
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.Log.Warn("Error reading idmap", log.Ctx{"err": err.Error()})
shared.Log.Warn("Only privileged containers will be able to run")
} else {
shared.Log.Info("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
}
}
/* Initialize the database */
err = initializeDbObject(d, shared.VarPath("lxd.db"))
if err != nil {
return err
}
/* Prune images */
d.pruneChan = make(chan bool)
go func() {
d.pruneExpiredImages()
for {
timer := time.NewTimer(24 * time.Hour)
timeChan := timer.C
select {
case <-timeChan:
/* run once per day */
d.pruneExpiredImages()
case <-d.pruneChan:
/* run when image.remote_cache_expiry is changed */
d.pruneExpiredImages()
timer.Stop()
}
}
}()
/* Setup /dev/lxd */
d.devlxd, err = createAndBindDevLxd()
if err != nil {
return err
}
if err := setupSharedMounts(); err != nil {
return err
}
var tlsConfig *tls.Config
if !d.IsMock {
err = d.SetupStorageDriver()
if err != nil {
return fmt.Errorf("Failed to setup storage: %s", err)
}
/* Restart containers */
go func() {
containersRestart(d)
}()
/* Start the scheduler */
go deviceTaskScheduler(d)
/* Setup the TLS authentication */
certf, keyf, err := readMyCert()
if err != nil {
return err
}
d.certf = certf
d.keyf = keyf
readSavedClientCAList(d)
tlsConfig, err = shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return err
}
}
/* Setup the web server */
d.mux = mux.NewRouter()
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
for _, c := range apiInternal {
d.createCmd("internal", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Log.Debug("Sending top level 404", log.Ctx{"url": r.URL})
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
listeners, err := activation.Listeners(false)
if err != nil {
return err
}
var sockets []Socket
if len(listeners) > 0 {
shared.Log.Info("LXD is socket activated")
for _, listener := range listeners {
if shared.PathExists(listener.Addr().String()) {
sockets = append(sockets, Socket{Socket: listener, CloseOnExit: false})
} else {
tlsListener := tls.NewListener(listener, tlsConfig)
sockets = append(sockets, Socket{Socket: tlsListener, CloseOnExit: false})
}
}
} else {
shared.Log.Info("LXD isn't socket activated")
localSocketPath := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if shared.PathExists(localSocketPath) {
c, err := lxd.NewClient(&lxd.DefaultConfig, "local")
if err != nil {
return err
}
err = c.Finger()
if err != nil {
shared.Log.Debug("Detected stale unix socket, deleting")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocketPath)
if err != nil {
return err
}
} else {
return fmt.Errorf("LXD is already running.")
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocketPath)
if err != nil {
return fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return fmt.Errorf("cannot listen on unix socket: %v", err)
}
if err := os.Chmod(localSocketPath, 0660); err != nil {
return err
}
var gid int
if d.group != "" {
gid, err = shared.GroupId(d.group)
if err != nil {
return err
}
} else {
gid = os.Getgid()
}
if err := os.Chown(localSocketPath, os.Getuid(), gid); err != nil {
return err
}
sockets = append(sockets, Socket{Socket: unixl, CloseOnExit: true})
}
listenAddr, err := d.ConfigValueGet("core.https_address")
if err != nil {
return err
}
if listenAddr != "" {
_, _, err := net.SplitHostPort(listenAddr)
if err != nil {
listenAddr = fmt.Sprintf("%s:%s", listenAddr, shared.DefaultPort)
}
tcpl, err := tls.Listen("tcp", listenAddr, tlsConfig)
if err != nil {
shared.Log.Error("cannot listen on https socket, skipping...", log.Ctx{"err": err})
} else {
sockets = append(sockets, Socket{Socket: tcpl, CloseOnExit: true})
}
}
if !d.IsMock {
d.Sockets = sockets
} else {
d.Sockets = []Socket{}
}
d.tomb.Go(func() error {
shared.Log.Info("REST API daemon:")
for _, socket := range d.Sockets {
shared.Log.Info(" - binding socket", log.Ctx{"socket": socket.Socket.Addr()})
current_socket := socket
d.tomb.Go(func() error { return http.Serve(current_socket.Socket, d.mux) })
}
d.tomb.Go(func() error {
server := devLxdServer(d)
return server.Serve(d.devlxd)
})
return nil
})
return nil
}
// StartDaemon starts the shared daemon with the provided configuration.
func StartDaemon() (*Daemon, error) {
d := &Daemon{}
/* Setup logging */
if shared.Log == nil {
shared.SetLogger("", "", true, true)
}
shared.Log.Info("LXD is starting.")
/* Get the list of supported architectures */
var architectures = []int{}
uname := syscall.Utsname{}
if err := syscall.Uname(&uname); err != nil {
return nil, err
}
architectureName := ""
for _, c := range uname.Machine {
if c == 0 {
break
}
architectureName += string(byte(c))
}
architecture, err := shared.ArchitectureId(architectureName)
if err != nil {
return nil, err
}
architectures = append(architectures, architecture)
personalities, err := shared.ArchitecturePersonalities(architecture)
if err != nil {
return nil, err
}
for _, personality := range personalities {
architectures = append(architectures, personality)
}
d.architectures = architectures
/* Create required paths */
d.lxcpath = shared.VarPath("containers")
err = os.MkdirAll(d.lxcpath, 0755)
if err != nil {
return nil, err
}
// Create default directories
if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
return nil, err
}
if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
return nil, err
}
if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
return nil, err
}
/* Detect the filesystem */
d.BackingFs, err = filesystemDetect(d.lxcpath)
if err != nil {
shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
}
/* Read the uid/gid allocation */
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.Log.Warn("error reading idmap", log.Ctx{"err": err.Error()})
shared.Log.Warn("operations requiring idmap will not be available")
} else {
shared.Log.Info("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
}
}
/* Initialize the database */
err = initDb(d)
if err != nil {
return nil, err
}
/* Setup the TLS authentication */
certf, keyf, err := readMyCert()
if err != nil {
return nil, err
}
d.certf = certf
d.keyf = keyf
readSavedClientCAList(d)
tlsConfig, err := shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return nil, err
}
/* Setup /dev/lxd */
d.devlxd, err = createAndBindDevLxd()
if err != nil {
return nil, err
}
if err := setupSharedMounts(); err != nil {
return nil, err
}
/* Restart containers */
containersRestart(d)
containersWatch(d)
err = d.SetupStorageDriver()
if err != nil {
return nil, fmt.Errorf("Failed to setup storage: %s", err)
}
/* Setup the web server */
d.mux = mux.NewRouter()
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Log.Debug("sending top level 404", log.Ctx{"url": r.URL})
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
listeners, err := activation.Listeners(false)
if err != nil {
return nil, err
}
var sockets []net.Listener
if len(listeners) > 0 {
shared.Log.Info("LXD is socket activated.")
for _, listener := range listeners {
if shared.PathExists(listener.Addr().String()) {
sockets = append(sockets, listener)
} else {
tlsListener := tls.NewListener(listener, tlsConfig)
sockets = append(sockets, tlsListener)
}
}
} else {
shared.Log.Info("LXD isn't socket activated.")
localSocketPath := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if shared.PathExists(localSocketPath) {
c := &lxd.Config{Remotes: map[string]lxd.RemoteConfig{}}
_, err := lxd.NewClient(c, "")
if err != nil {
shared.Log.Debug("Detected old but dead unix socket, deleting it...")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocketPath)
if err != nil {
return nil, err
}
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocketPath)
if err != nil {
return nil, fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return nil, fmt.Errorf("cannot listen on unix socket: %v", err)
}
if err := os.Chmod(localSocketPath, 0660); err != nil {
return nil, err
}
gid, err := shared.GroupId(*group)
if err != nil {
return nil, err
}
if err := os.Chown(localSocketPath, os.Getuid(), gid); err != nil {
return nil, err
}
sockets = append(sockets, unixl)
}
listenAddr, err := d.ConfigValueGet("core.https_address")
if err != nil {
return nil, err
}
if listenAddr != "" {
_, _, err := net.SplitHostPort(listenAddr)
if err != nil {
listenAddr = fmt.Sprintf("%s:%s", listenAddr, shared.DefaultPort)
}
tcpl, err := tls.Listen("tcp", listenAddr, tlsConfig)
if err != nil {
return nil, fmt.Errorf("cannot listen on https socket: %v", err)
}
sockets = append(sockets, tcpl)
}
d.Sockets = sockets
d.pruneChan = make(chan bool)
go func() {
for {
expiryStr, err := dbGetImageExpiry(d)
var expiry int
if err != nil {
expiry = 10
} else {
expiry, err = strconv.Atoi(expiryStr)
if err != nil {
expiry = 10
}
if expiry <= 0 {
expiry = 1
}
}
timer := time.NewTimer(time.Duration(expiry) * 24 * time.Hour)
timeChan := timer.C
select {
case <-timeChan:
d.pruneExpiredImages()
case <-d.pruneChan:
d.pruneExpiredImages()
timer.Stop()
}
}
}()
d.tomb.Go(func() error {
for _, socket := range d.Sockets {
shared.Log.Info(" - binding socket", log.Ctx{"socket": socket.Addr()})
current_socket := socket
d.tomb.Go(func() error { return http.Serve(current_socket, d.mux) })
}
d.tomb.Go(func() error {
server := devLxdServer(d)
return server.Serve(d.devlxd)
})
return nil
})
return d, nil
}
func (d *Daemon) Init() error {
/* Initialize some variables */
d.imagesDownloading = map[string]chan bool{}
d.readyChan = make(chan bool)
d.shutdownChan = make(chan bool)
/* Set the executable path */
absPath, err := os.Readlink("/proc/self/exe")
if err != nil {
return err
}
d.execPath = absPath
/* Set the LVM environment */
err = os.Setenv("LVM_SUPPRESS_FD_WARNINGS", "1")
if err != nil {
return err
}
/* Setup logging if that wasn't done before */
if shared.Log == nil {
shared.Log, err = logging.GetLogger("", "", true, true, nil)
if err != nil {
return err
}
}
/* Print welcome message */
if d.MockMode {
shared.Log.Info("LXD is starting in mock mode",
log.Ctx{"path": shared.VarPath("")})
} else if d.SetupMode {
shared.Log.Info("LXD is starting in setup mode",
log.Ctx{"path": shared.VarPath("")})
} else {
shared.Log.Info("LXD is starting in normal mode",
log.Ctx{"path": shared.VarPath("")})
}
/* Detect user namespaces */
runningInUserns = shared.RunningInUserNS()
/* Detect AppArmor support */
if aaAvailable && os.Getenv("LXD_SECURITY_APPARMOR") == "false" {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been manually disabled")
}
if aaAvailable && !shared.IsDir("/sys/kernel/security/apparmor") {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been disabled because of lack of kernel support")
}
_, err = exec.LookPath("apparmor_parser")
if aaAvailable && err != nil {
aaAvailable = false
aaAdmin = false
shared.Log.Warn("AppArmor support has been disabled because 'apparmor_parser' couldn't be found")
}
/* Detect AppArmor admin support */
if aaAdmin && !haveMacAdmin() {
aaAdmin = false
shared.Log.Warn("Per-container AppArmor profiles are disabled because the mac_admin capability is missing.")
}
if aaAdmin && runningInUserns {
aaAdmin = false
shared.Log.Warn("Per-container AppArmor profiles are disabled because LXD is running in an unprivileged container.")
}
/* Detect AppArmor confinment */
if !aaConfined {
profile := aaProfile()
if profile != "unconfined" && profile != "" {
aaConfined = true
shared.Log.Warn("Per-container AppArmor profiles are disabled because LXD is already protected by AppArmor.")
}
}
/* Detect CGroup support */
cgBlkioController = shared.PathExists("/sys/fs/cgroup/blkio/")
if !cgBlkioController {
shared.Log.Warn("Couldn't find the CGroup blkio controller, I/O limits will be ignored.")
}
cgCpuController = shared.PathExists("/sys/fs/cgroup/cpu/")
if !cgCpuController {
shared.Log.Warn("Couldn't find the CGroup CPU controller, CPU time limits will be ignored.")
}
cgCpusetController = shared.PathExists("/sys/fs/cgroup/cpuset/")
if !cgCpusetController {
shared.Log.Warn("Couldn't find the CGroup CPUset controller, CPU pinning will be ignored.")
}
cgDevicesController = shared.PathExists("/sys/fs/cgroup/devices/")
if !cgDevicesController {
shared.Log.Warn("Couldn't find the CGroup devices controller, device access control won't work.")
}
cgMemoryController = shared.PathExists("/sys/fs/cgroup/memory/")
if !cgMemoryController {
shared.Log.Warn("Couldn't find the CGroup memory controller, memory limits will be ignored.")
}
cgNetPrioController = shared.PathExists("/sys/fs/cgroup/net_prio/")
if !cgNetPrioController {
shared.Log.Warn("Couldn't find the CGroup network class controller, network limits will be ignored.")
}
cgPidsController = shared.PathExists("/sys/fs/cgroup/pids/")
if !cgPidsController {
shared.Log.Warn("Couldn't find the CGroup pids controller, process limits will be ignored.")
}
cgSwapAccounting = shared.PathExists("/sys/fs/cgroup/memory/memory.memsw.limit_in_bytes")
if !cgSwapAccounting {
shared.Log.Warn("CGroup memory swap accounting is disabled, swap limits will be ignored.")
}
/* Get the list of supported architectures */
var architectures = []int{}
architectureName, err := shared.ArchitectureGetLocal()
if err != nil {
return err
}
architecture, err := shared.ArchitectureId(architectureName)
if err != nil {
return err
}
architectures = append(architectures, architecture)
personalities, err := shared.ArchitecturePersonalities(architecture)
if err != nil {
return err
}
for _, personality := range personalities {
architectures = append(architectures, personality)
}
d.architectures = architectures
/* Set container path */
d.lxcpath = shared.VarPath("containers")
/* Make sure all our directories are available */
if err := os.MkdirAll(shared.VarPath("containers"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("devices"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.LogPath(), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("security"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("shmounts"), 0711); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
return err
}
/* Detect the filesystem */
d.BackingFs, err = filesystemDetect(d.lxcpath)
if err != nil {
shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
}
/* Read the uid/gid allocation */
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.Log.Warn("Error reading idmap", log.Ctx{"err": err.Error()})
shared.Log.Warn("Only privileged containers will be able to run")
} else {
shared.Log.Info("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
}
}
/* Initialize the database */
err = initializeDbObject(d, shared.VarPath("lxd.db"))
if err != nil {
return err
}
/* Setup the storage driver */
if !d.MockMode {
err = d.SetupStorageDriver()
if err != nil {
return fmt.Errorf("Failed to setup storage: %s", err)
}
}
/* Load all config values from the database */
_, err = d.ConfigValuesGet()
if err != nil {
return err
}
/* set the initial proxy function based on config values in the DB */
d.updateProxy()
/* Setup /dev/lxd */
d.devlxd, err = createAndBindDevLxd()
if err != nil {
return err
}
if err := setupSharedMounts(); err != nil {
return err
}
if !d.MockMode {
/* Start the scheduler */
go deviceEventListener(d)
/* Setup the TLS authentication */
certf, keyf, err := readMyCert()
if err != nil {
return err
}
cert, err := tls.LoadX509KeyPair(certf, keyf)
if err != nil {
return err
}
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
ClientAuth: tls.RequestClientCert,
Certificates: []tls.Certificate{cert},
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256},
PreferServerCipherSuites: true,
}
tlsConfig.BuildNameToCertificate()
d.tlsConfig = tlsConfig
readSavedClientCAList(d)
}
/* Setup the web server */
d.mux = mux.NewRouter()
d.mux.StrictSlash(false)
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
for _, c := range apiInternal {
d.createCmd("internal", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Log.Debug("Sending top level 404", log.Ctx{"url": r.URL})
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
listeners, err := activation.Listeners(false)
if err != nil {
return err
}
if len(listeners) > 0 {
shared.Log.Info("LXD is socket activated")
for _, listener := range listeners {
if shared.PathExists(listener.Addr().String()) {
d.UnixSocket = &Socket{Socket: listener, CloseOnExit: false}
} else {
tlsListener := tls.NewListener(listener, d.tlsConfig)
d.TCPSocket = &Socket{Socket: tlsListener, CloseOnExit: false}
}
}
} else {
shared.Log.Info("LXD isn't socket activated")
localSocketPath := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if shared.PathExists(localSocketPath) {
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
if err != nil {
shared.Log.Debug("Detected stale unix socket, deleting")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocketPath)
if err != nil {
return err
}
} else {
return fmt.Errorf("LXD is already running.")
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocketPath)
if err != nil {
return fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return fmt.Errorf("cannot listen on unix socket: %v", err)
}
if err := os.Chmod(localSocketPath, 0660); err != nil {
return err
}
var gid int
if d.group != "" {
gid, err = shared.GroupId(d.group)
if err != nil {
return err
}
} else {
gid = os.Getgid()
}
if err := os.Chown(localSocketPath, os.Getuid(), gid); err != nil {
return err
}
d.UnixSocket = &Socket{Socket: unixl, CloseOnExit: true}
}
listenAddr, err := d.ConfigValueGet("core.https_address")
if err != nil {
return err
}
if listenAddr != "" {
_, _, err := net.SplitHostPort(listenAddr)
if err != nil {
listenAddr = fmt.Sprintf("%s:%s", listenAddr, shared.DefaultPort)
}
tcpl, err := tls.Listen("tcp", listenAddr, d.tlsConfig)
if err != nil {
shared.Log.Error("cannot listen on https socket, skipping...", log.Ctx{"err": err})
} else {
if d.TCPSocket != nil {
shared.Log.Info("Replacing systemd TCP socket by configure one")
d.TCPSocket.Socket.Close()
}
d.TCPSocket = &Socket{Socket: tcpl, CloseOnExit: true}
}
}
d.tomb.Go(func() error {
shared.Log.Info("REST API daemon:")
if d.UnixSocket != nil {
shared.Log.Info(" - binding Unix socket", log.Ctx{"socket": d.UnixSocket.Socket.Addr()})
d.tomb.Go(func() error { return http.Serve(d.UnixSocket.Socket, &lxdHttpServer{d.mux, d}) })
}
if d.TCPSocket != nil {
shared.Log.Info(" - binding TCP socket", log.Ctx{"socket": d.TCPSocket.Socket.Addr()})
d.tomb.Go(func() error { return http.Serve(d.TCPSocket.Socket, &lxdHttpServer{d.mux, d}) })
}
d.tomb.Go(func() error {
server := devLxdServer(d)
return server.Serve(d.devlxd)
})
return nil
})
if !d.MockMode && !d.SetupMode {
err := d.Ready()
if err != nil {
return err
}
}
return nil
}
func (d *Daemon) Init() error {
/* Setup logging */
if shared.Log == nil {
shared.SetLogger("", "", true, true)
}
if !d.IsMock {
shared.Log.Info("LXD is starting",
log.Ctx{"path": shared.VarPath("")})
} else {
shared.Log.Info("Mock LXD is starting",
log.Ctx{"path": shared.VarPath("")})
}
/* Detect user namespaces */
runningInUserns = shared.RunningInUserNS()
/* Detect apparmor support */
if aaEnabled && os.Getenv("LXD_SECURITY_APPARMOR") == "false" {
aaEnabled = false
shared.Log.Warn("Per-container AppArmor profiles have been manually disabled")
}
if aaEnabled && !shared.IsDir("/sys/kernel/security/apparmor") {
aaEnabled = false
shared.Log.Warn("Per-container AppArmor profiles disabled because of lack of kernel support")
}
if aaEnabled && !haveMacAdmin() {
shared.Log.Warn("Per-container AppArmor profiles are disabled because mac_admin capability is missing.")
aaEnabled = false
}
_, err := exec.LookPath("apparmor_parser")
if aaEnabled && err != nil {
aaEnabled = false
shared.Log.Warn("Per-container AppArmor profiles disabled because 'apparmor_parser' couldn't be found")
}
if aaEnabled && runningInUserns {
aaEnabled = false
shared.Log.Warn("Per-container AppArmor profiles disabled because LXD is running inside a user namespace")
}
/* Get the list of supported architectures */
var architectures = []int{}
uname := syscall.Utsname{}
if err := syscall.Uname(&uname); err != nil {
return err
}
architectureName := ""
for _, c := range uname.Machine {
if c == 0 {
break
}
architectureName += string(byte(c))
}
architecture, err := shared.ArchitectureId(architectureName)
if err != nil {
return err
}
architectures = append(architectures, architecture)
personalities, err := shared.ArchitecturePersonalities(architecture)
if err != nil {
return err
}
for _, personality := range personalities {
architectures = append(architectures, personality)
}
d.architectures = architectures
/* Create required paths */
d.lxcpath = shared.VarPath("containers")
err = os.MkdirAll(d.lxcpath, 0755)
if err != nil {
return err
}
// Create default directories
if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
return err
}
if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
return err
}
/* Detect the filesystem */
d.BackingFs, err = filesystemDetect(d.lxcpath)
if err != nil {
shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
}
/* Read the uid/gid allocation */
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.Log.Warn("Error reading idmap", log.Ctx{"err": err.Error()})
shared.Log.Warn("Only privileged containers will be able to run")
} else {
shared.Log.Info("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
}
}
/* Initialize the database */
err = initializeDbObject(d, shared.VarPath("lxd.db"))
if err != nil {
return err
}
/* Prune images */
d.pruneChan = make(chan bool)
go func() {
for {
expiryStr, err := dbImageExpiryGet(d.db)
var expiry int
if err != nil {
expiry = 10
} else {
expiry, err = strconv.Atoi(expiryStr)
if err != nil {
expiry = 10
}
if expiry <= 0 {
expiry = 1
}
}
timer := time.NewTimer(time.Duration(expiry) * 24 * time.Hour)
timeChan := timer.C
select {
case <-timeChan:
d.pruneExpiredImages()
case <-d.pruneChan:
d.pruneExpiredImages()
timer.Stop()
}
}
}()
/* Setup /dev/lxd */
d.devlxd, err = createAndBindDevLxd()
if err != nil {
return err
}
if err := setupSharedMounts(); err != nil {
return err
}
var tlsConfig *tls.Config
if !d.IsMock {
err = d.SetupStorageDriver()
if err != nil {
return fmt.Errorf("Failed to setup storage: %s", err)
}
/* Restart containers */
containersRestart(d)
containersWatch(d)
/* Setup the TLS authentication */
certf, keyf, err := readMyCert()
if err != nil {
return err
}
d.certf = certf
d.keyf = keyf
readSavedClientCAList(d)
tlsConfig, err = shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return err
}
}
/* Setup the web server */
d.mux = mux.NewRouter()
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Log.Debug("Sending top level 404", log.Ctx{"url": r.URL})
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
listeners, err := activation.Listeners(false)
if err != nil {
return err
}
var sockets []Socket
if len(listeners) > 0 {
shared.Log.Info("LXD is socket activated")
for _, listener := range listeners {
if shared.PathExists(listener.Addr().String()) {
sockets = append(sockets, Socket{Socket: listener, CloseOnExit: false})
} else {
tlsListener := tls.NewListener(listener, tlsConfig)
sockets = append(sockets, Socket{Socket: tlsListener, CloseOnExit: false})
}
}
} else {
shared.Log.Info("LXD isn't socket activated")
localSocketPath := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if shared.PathExists(localSocketPath) {
c := &lxd.Config{Remotes: map[string]lxd.RemoteConfig{}}
_, err := lxd.NewClient(c, "")
if err != nil {
shared.Log.Debug("Detected stale unix socket, deleting")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocketPath)
if err != nil {
return err
}
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocketPath)
if err != nil {
return fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return fmt.Errorf("cannot listen on unix socket: %v", err)
}
if err := os.Chmod(localSocketPath, 0660); err != nil {
return err
}
gid, err := shared.GroupId(*group)
if err != nil {
return err
}
if err := os.Chown(localSocketPath, os.Getuid(), gid); err != nil {
return err
}
sockets = append(sockets, Socket{Socket: unixl, CloseOnExit: true})
}
listenAddr, err := d.ConfigValueGet("core.https_address")
if err != nil {
return err
}
if listenAddr != "" {
_, _, err := net.SplitHostPort(listenAddr)
if err != nil {
listenAddr = fmt.Sprintf("%s:%s", listenAddr, shared.DefaultPort)
}
tcpl, err := tls.Listen("tcp", listenAddr, tlsConfig)
if err != nil {
shared.Log.Error("cannot listen on https socket, skipping...", log.Ctx{"err": err})
} else {
sockets = append(sockets, Socket{Socket: tcpl, CloseOnExit: true})
}
}
if !d.IsMock {
d.Sockets = sockets
} else {
d.Sockets = []Socket{}
}
d.tomb.Go(func() error {
shared.Log.Info("REST API daemon:")
for _, socket := range d.Sockets {
shared.Log.Info(" - binding socket", log.Ctx{"socket": socket.Socket.Addr()})
current_socket := socket
d.tomb.Go(func() error { return http.Serve(current_socket.Socket, d.mux) })
}
d.tomb.Go(func() error {
server := devLxdServer(d)
return server.Serve(d.devlxd)
})
return nil
})
return nil
}
func cmdActivateIfNeeded() error {
// Don't start a full daemon, we just need DB access
d := &Daemon{
imagesDownloading: map[string]chan bool{},
imagesDownloadingLock: sync.RWMutex{},
lxcpath: shared.VarPath("containers"),
}
if !shared.PathExists(shared.VarPath("lxd.db")) {
shared.LogDebugf("No DB, so no need to start the daemon now.")
return nil
}
err := initializeDbObject(d, shared.VarPath("lxd.db"))
if err != nil {
return err
}
/* Load all config values from the database */
err = daemonConfigInit(d.db)
if err != nil {
return err
}
// Look for network socket
value := daemonConfig["core.https_address"].Get()
if value != "" {
shared.LogDebugf("Daemon has core.https_address set, activating...")
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
return err
}
// Look for auto-started or previously started containers
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
return err
}
result, err := dbContainersList(d.db, cTypeRegular)
if err != nil {
return err
}
for _, name := range result {
c, err := containerLoadByName(d, name)
if err != nil {
return err
}
config := c.ExpandedConfig()
lastState := config["volatile.last_state.power"]
autoStart := config["boot.autostart"]
if c.IsRunning() {
shared.LogDebugf("Daemon has running containers, activating...")
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
return err
}
if lastState == "RUNNING" || lastState == "Running" || shared.IsTrue(autoStart) {
shared.LogDebugf("Daemon has auto-started containers, activating...")
_, err := lxd.NewClient(&lxd.DefaultConfig, "local")
return err
}
}
shared.LogDebugf("No need to start the daemon now.")
return nil
}
// StartDaemon starts the shared daemon with the provided configuration.
func StartDaemon(listenAddr string) (*Daemon, error) {
d := &Daemon{}
d.lxcpath = shared.VarPath("lxc")
err := os.MkdirAll(shared.VarPath("/"), 0755)
if err != nil {
return nil, err
}
err = os.MkdirAll(d.lxcpath, 0755)
if err != nil {
return nil, err
}
d.BackingFs, err = shared.GetFilesystem(d.lxcpath)
if err != nil {
shared.Debugf("Error detecting backing fs: %s\n", err)
}
certf, keyf, err := readMyCert()
if err != nil {
return nil, err
}
d.certf = certf
d.keyf = keyf
err = initDb(d)
if err != nil {
return nil, err
}
readSavedClientCAList(d)
d.mux = mux.NewRouter()
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Debugf("sending top level 404: %s", r.URL)
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.Logf("error reading idmap: %s", err.Error())
shared.Logf("operations requiring idmap will not be available")
} else {
shared.Debugf("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.Debugf(" - " + lxcmap)
}
}
tlsConfig, err := shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return nil, err
}
listeners, err := activation.Listeners(false)
if err != nil {
return nil, err
}
var localSockets []net.Listener
var remoteSockets []net.Listener
if len(listeners) > 0 {
shared.Debugf("LXD is socket activated.\n")
for _, listener := range listeners {
if _, err := os.Stat(listener.Addr().String()); err == nil {
localSockets = append(localSockets, listener)
} else {
tlsListener := tls.NewListener(listener, tlsConfig)
remoteSockets = append(remoteSockets, tlsListener)
}
}
} else {
shared.Debugf("LXD isn't socket activated.\n")
localSocketPath := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if _, err := os.Stat(localSocketPath); err == nil {
c := &lxd.Config{Remotes: map[string]lxd.RemoteConfig{}}
_, err := lxd.NewClient(c, "")
if err != nil {
shared.Debugf("Detected old but dead unix socket, deleting it...")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocketPath)
if err != nil {
return nil, err
}
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocketPath)
if err != nil {
return nil, fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return nil, fmt.Errorf("cannot listen on unix socket: %v", err)
}
if err := os.Chmod(localSocketPath, 0660); err != nil {
return nil, err
}
gid, err := shared.GroupId(*group)
if err != nil {
return nil, err
}
if err := os.Chown(localSocketPath, os.Getuid(), gid); err != nil {
return nil, err
}
localSockets = append(localSockets, unixl)
if listenAddr != "" {
tcpl, err := tls.Listen("tcp", listenAddr, tlsConfig)
if err != nil {
return nil, fmt.Errorf("cannot listen on unix socket: %v", err)
}
remoteSockets = append(remoteSockets, tcpl)
}
}
d.localSockets = localSockets
d.remoteSockets = remoteSockets
d.devlxd, err = createAndBindDevLxd()
if err != nil {
return nil, err
}
containersRestart(d)
containersWatch(d)
d.tomb.Go(func() error {
for _, socket := range d.localSockets {
shared.Debugf(" - binding local socket: %s\n", socket.Addr())
d.tomb.Go(func() error { return http.Serve(socket, d.mux) })
}
for _, socket := range d.remoteSockets {
shared.Debugf(" - binding remote socket: %s\n", socket.Addr())
d.tomb.Go(func() error { return http.Serve(socket, d.mux) })
}
d.tomb.Go(func() error {
server := devLxdServer(d)
return server.Serve(d.devlxd)
})
return nil
})
return d, nil
}