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 */
/* 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.LogInfo("LXD is starting in mock mode",
log.Ctx{"path": shared.VarPath("")})
} else if d.SetupMode {
shared.LogInfo("LXD is starting in setup mode",
log.Ctx{"path": shared.VarPath("")})
} else {
shared.LogInfo("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.LogWarnf("AppArmor support has been manually disabled")
}
if aaAvailable && !shared.IsDir("/sys/kernel/security/apparmor") {
aaAvailable = false
aaAdmin = false
shared.LogWarnf("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.LogWarnf("AppArmor support has been disabled because 'apparmor_parser' couldn't be found")
}
/* Detect AppArmor admin support */
if aaAdmin && !haveMacAdmin() {
aaAdmin = false
shared.LogWarnf("Per-container AppArmor profiles are disabled because the mac_admin capability is missing.")
}
if aaAdmin && runningInUserns {
aaAdmin = false
shared.LogWarnf("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.LogWarnf("Per-container AppArmor profiles are disabled because LXD is already protected by AppArmor.")
}
}
if aaAvailable {
canStack := func() bool {
contentBytes, err := ioutil.ReadFile("/sys/kernel/security/apparmor/features/domain/stack")
if err != nil {
return false
}
if string(contentBytes) != "yes\n" {
return false
}
contentBytes, err = ioutil.ReadFile("/sys/kernel/security/apparmor/features/domain/version")
if err != nil {
return false
}
content := string(contentBytes)
parts := strings.Split(strings.TrimSpace(content), ".")
if len(parts) == 0 {
shared.LogWarn("unknown apparmor domain version", log.Ctx{"version": content})
return false
}
major, err := strconv.Atoi(parts[0])
if err != nil {
shared.LogWarn("unknown apparmor domain version", log.Ctx{"version": content})
return false
}
minor := 0
if len(parts) == 2 {
minor, err = strconv.Atoi(parts[1])
if err != nil {
shared.LogWarn("unknown apparmor domain version", log.Ctx{"version": content})
return false
}
}
return major >= 1 && minor >= 2
}
aaStacking = canStack()
}
/* Detect CGroup support */
cgBlkioController = shared.PathExists("/sys/fs/cgroup/blkio/")
if !cgBlkioController {
shared.LogWarnf("Couldn't find the CGroup blkio controller, I/O limits will be ignored.")
}
cgCpuController = shared.PathExists("/sys/fs/cgroup/cpu/")
if !cgCpuController {
shared.LogWarnf("Couldn't find the CGroup CPU controller, CPU time limits will be ignored.")
}
cgCpuacctController = shared.PathExists("/sys/fs/cgroup/cpuacct/")
if !cgCpuacctController {
shared.LogWarnf("Couldn't find the CGroup CPUacct controller, CPU accounting will not be available.")
}
cgCpusetController = shared.PathExists("/sys/fs/cgroup/cpuset/")
if !cgCpusetController {
shared.LogWarnf("Couldn't find the CGroup CPUset controller, CPU pinning will be ignored.")
}
cgDevicesController = shared.PathExists("/sys/fs/cgroup/devices/")
if !cgDevicesController {
shared.LogWarnf("Couldn't find the CGroup devices controller, device access control won't work.")
}
cgMemoryController = shared.PathExists("/sys/fs/cgroup/memory/")
if !cgMemoryController {
shared.LogWarnf("Couldn't find the CGroup memory controller, memory limits will be ignored.")
}
cgNetPrioController = shared.PathExists("/sys/fs/cgroup/net_prio/")
if !cgNetPrioController {
shared.LogWarnf("Couldn't find the CGroup network class controller, network limits will be ignored.")
}
cgPidsController = shared.PathExists("/sys/fs/cgroup/pids/")
if !cgPidsController {
shared.LogWarnf("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.LogWarnf("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.CachePath(), 0700); err != nil {
return err
}
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.LogError("Error detecting backing fs", log.Ctx{"err": err})
}
/* Read the uid/gid allocation */
d.IdmapSet, err = shared.DefaultIdmapSet()
if err != nil {
shared.LogWarn("Error reading idmap", log.Ctx{"err": err.Error()})
shared.LogWarnf("Only privileged containers will be able to run")
} else {
shared.LogInfof("Default uid/gid map:")
for _, lxcmap := range d.IdmapSet.ToLxcString() {
shared.LogInfof(strings.TrimRight(" - "+lxcmap, "\n"))
}
}
/* Initialize the database */
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
}
if !d.MockMode {
/* Setup the storage driver */
err = d.SetupStorageDriver()
if err != nil {
return fmt.Errorf("Failed to setup storage: %s", err)
}
/* Apply all patches */
err = patchesApplyAll(d)
if err != nil {
return err
}
/* Setup the networks */
err = networkStartup(d)
if err != nil {
return err
}
/* Restore simplestreams cache */
err = imageLoadStreamCache(d)
if err != nil {
return err
}
}
/* Log expiry */
go func() {
t := time.NewTicker(24 * time.Hour)
for {
shared.LogInfof("Expiring log files")
err := d.ExpireLogs()
if err != nil {
shared.LogError("Failed to expire logs", log.Ctx{"err": err})
}
shared.LogInfof("Done expiring log files")
<-t.C
}
}()
/* set the initial proxy function based on config values in the DB */
d.proxy = shared.ProxyFromConfig(
daemonConfig["core.proxy_https"].Get(),
daemonConfig["core.proxy_http"].Get(),
daemonConfig["core.proxy_ignore_hosts"].Get(),
)
/* Setup /dev/lxd */
shared.LogInfof("Starting /dev/lxd handler")
d.devlxd, err = createAndBindDevLxd()
if 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_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA},
PreferServerCipherSuites: true,
}
if shared.PathExists(shared.VarPath("server.ca")) {
ca, err := shared.ReadCert(shared.VarPath("server.ca"))
if err != nil {
return err
}
caPool := x509.NewCertPool()
caPool.AddCert(ca)
tlsConfig.RootCAs = caPool
tlsConfig.ClientCAs = caPool
shared.LogInfof("LXD is in CA mode, only CA-signed certificates will be allowed")
}
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.LogInfo("Sending top level 404", log.Ctx{"url": r.URL})
w.Header().Set("Content-Type", "application/json")
NotFound.Render(w)
})
listeners := d.GetListeners()
if len(listeners) > 0 {
shared.LogInfof("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.LogInfof("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.LogDebugf("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 := daemonConfig["core.https_address"].Get()
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.LogError("cannot listen on https socket, skipping...", log.Ctx{"err": err})
} else {
if d.TCPSocket != nil {
shared.LogInfof("Replacing inherited TCP socket with configured one")
d.TCPSocket.Socket.Close()
}
d.TCPSocket = &Socket{Socket: tcpl, CloseOnExit: true}
}
}
d.tomb.Go(func() error {
shared.LogInfof("REST API daemon:")
if d.UnixSocket != nil {
shared.LogInfo(" - 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.LogInfo(" - 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
}
// ImageDownload checks if we have that Image Fingerprint else
// downloads the image from a remote server.
func (d *Daemon) ImageDownload(op *operation, server string, protocol string, certificate string, secret string, alias string, forContainer bool, autoUpdate bool) (string, error) {
var err error
var ss *shared.SimpleStreams
var ctxMap log.Ctx
if protocol == "" {
protocol = "lxd"
}
fp := alias
// Expand aliases
if protocol == "simplestreams" {
imageStreamCacheLock.Lock()
entry, _ := imageStreamCache[server]
if entry == nil || entry.expiry.Before(time.Now()) {
refresh := func() (*imageStreamCacheEntry, error) {
// Setup simplestreams client
ss, err = shared.SimpleStreamsClient(server, d.proxy)
if err != nil {
return nil, err
}
// Get all aliases
aliases, err := ss.ListAliases()
if err != nil {
return nil, err
}
// Get all fingerprints
images, err := ss.ListImages()
if err != nil {
return nil, err
}
fingerprints := []string{}
for _, image := range images {
fingerprints = append(fingerprints, image.Fingerprint)
}
// Generate cache entry
entry = &imageStreamCacheEntry{ss: ss, Aliases: aliases, Fingerprints: fingerprints, expiry: time.Now().Add(time.Hour)}
imageStreamCache[server] = entry
imageSaveStreamCache()
return entry, nil
}
newEntry, err := refresh()
if err == nil {
// Cache refreshed
entry = newEntry
} else if entry != nil {
// Failed to fetch entry but existing cache
shared.LogWarn("Unable to refresh cache, using stale entry", log.Ctx{"server": server})
entry.expiry = time.Now().Add(time.Hour)
} else {
// Failed to fetch entry and nothing in cache
imageStreamCacheLock.Unlock()
return "", err
}
} else {
shared.LogDebug("Using SimpleStreams cache entry", log.Ctx{"server": server, "expiry": entry.expiry})
ss = entry.ss
}
imageStreamCacheLock.Unlock()
// Expand aliases
for _, alias := range entry.Aliases {
if alias.Name != fp {
continue
}
fp = alias.Target
break
}
// Expand fingerprint
for _, fingerprint := range entry.Fingerprints {
if !strings.HasPrefix(fingerprint, fp) {
continue
}
if fp == alias {
alias = fingerprint
}
fp = fingerprint
break
}
} else if protocol == "lxd" {
target, err := remoteGetImageFingerprint(d, server, certificate, fp)
if err == nil && target != "" {
fp = target
}
}
if _, _, err := dbImageGet(d.db, fp, false, false); err == nil {
shared.LogDebug("Image already exists in the db", log.Ctx{"image": fp})
// already have it
return fp, nil
}
// Now check if we already downloading the image
d.imagesDownloadingLock.RLock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
// We already download the image
d.imagesDownloadingLock.RUnlock()
shared.LogDebug(
"Already downloading the image, waiting for it to succeed",
log.Ctx{"image": fp})
// Wait until the download finishes (channel closes)
if _, ok := <-waitChannel; ok {
shared.LogWarnf("Value transmitted over image lock semaphore?")
}
if _, _, err := dbImageGet(d.db, fp, false, true); err != nil {
shared.LogError(
"Previous download didn't succeed",
log.Ctx{"image": fp})
return "", fmt.Errorf("Previous download didn't succeed")
}
shared.LogDebug(
"Previous download succeeded",
log.Ctx{"image": fp})
return fp, nil
}
d.imagesDownloadingLock.RUnlock()
if op == nil {
ctxMap = log.Ctx{"alias": alias, "server": server}
} else {
ctxMap = log.Ctx{"trigger": op.url, "image": fp, "operation": op.id, "alias": alias, "server": server}
}
shared.LogInfo("Downloading image", ctxMap)
// Add the download to the queue
d.imagesDownloadingLock.Lock()
d.imagesDownloading[fp] = make(chan bool)
d.imagesDownloadingLock.Unlock()
// Unlock once this func ends.
defer func() {
d.imagesDownloadingLock.Lock()
if waitChannel, ok := d.imagesDownloading[fp]; ok {
close(waitChannel)
delete(d.imagesDownloading, fp)
}
d.imagesDownloadingLock.Unlock()
}()
exporturl := server
var info shared.ImageInfo
info.Fingerprint = fp
destDir := shared.VarPath("images")
destName := filepath.Join(destDir, fp)
if shared.PathExists(destName) {
d.Storage.ImageDelete(fp)
}
progress := func(progressInt int64, speedInt int64) {
if op == nil {
return
}
meta := op.metadata
if meta == nil {
meta = make(map[string]interface{})
}
progress := fmt.Sprintf("%d%% (%s/s)", progressInt, shared.GetByteSizeString(speedInt))
if meta["download_progress"] != progress {
meta["download_progress"] = progress
op.UpdateMetadata(meta)
}
}
if protocol == "lxd" {
/* grab the metadata from /1.0/images/%s */
var url string
if secret != "" {
url = fmt.Sprintf(
"%s/%s/images/%s?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
url = fmt.Sprintf("%s/%s/images/%s", server, shared.APIVersion, fp)
}
resp, err := d.httpGetSync(url, certificate)
if err != nil {
shared.LogError(
"Failed to download image metadata",
log.Ctx{"image": fp, "err": err})
return "", err
}
if err := json.Unmarshal(resp.Metadata, &info); err != nil {
return "", err
}
/* now grab the actual file from /1.0/images/%s/export */
if secret != "" {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export?secret=%s",
server, shared.APIVersion, fp, secret)
} else {
exporturl = fmt.Sprintf(
"%s/%s/images/%s/export",
server, shared.APIVersion, fp)
}
} else if protocol == "simplestreams" {
err := ss.Download(fp, "meta", destName, nil)
if err != nil {
return "", err
}
err = ss.Download(fp, "root", destName+".rootfs", progress)
if err != nil {
return "", err
}
info, err := ss.GetImageInfo(fp)
if err != nil {
return "", err
}
info.Public = false
info.AutoUpdate = autoUpdate
_, err = imageBuildFromInfo(d, *info)
if err != nil {
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
shared.LogInfo("Image downloaded", ctxMap)
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}
raw, err := d.httpGetFile(exporturl, certificate)
if err != nil {
shared.LogError(
"Failed to download image",
log.Ctx{"image": fp, "err": err})
return "", err
}
info.Size = raw.ContentLength
ctype, ctypeParams, err := mime.ParseMediaType(raw.Header.Get("Content-Type"))
if err != nil {
ctype = "application/octet-stream"
}
body := &shared.ProgressReader{
ReadCloser: raw.Body,
Tracker: &shared.ProgressTracker{
Length: raw.ContentLength,
Handler: progress,
},
}
if ctype == "multipart/form-data" {
// Parse the POST data
mr := multipart.NewReader(body, ctypeParams["boundary"])
// Get the metadata tarball
part, err := mr.NextPart()
if err != nil {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "metadata" {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
// Get the rootfs tarball
part, err = mr.NextPart()
if err != nil {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if part.FormName() != "rootfs" {
shared.LogError(
"Invalid multipart image",
log.Ctx{"image": fp})
return "", fmt.Errorf("Invalid multipart image")
}
destName = filepath.Join(destDir, info.Fingerprint+".rootfs")
f, err = os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, part)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
} else {
destName = filepath.Join(destDir, info.Fingerprint)
f, err := os.Create(destName)
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
_, err = io.Copy(f, body)
f.Close()
if err != nil {
shared.LogError(
"Failed to save image",
log.Ctx{"image": fp, "err": err})
return "", err
}
}
if protocol == "direct" {
imageMeta, err := getImageMetadata(destName)
if err != nil {
return "", err
}
info.Architecture = imageMeta.Architecture
info.CreationDate = time.Unix(imageMeta.CreationDate, 0)
info.ExpiryDate = time.Unix(imageMeta.ExpiryDate, 0)
info.Properties = imageMeta.Properties
}
// By default, make all downloaded images private
info.Public = false
if alias != fp && secret == "" {
info.AutoUpdate = autoUpdate
}
_, err = imageBuildFromInfo(d, info)
if err != nil {
shared.LogError(
"Failed to create image",
log.Ctx{"image": fp, "err": err})
return "", err
}
if alias != fp {
id, _, err := dbImageGet(d.db, fp, false, true)
if err != nil {
return "", err
}
err = dbImageSourceInsert(d.db, id, server, protocol, "", alias)
if err != nil {
return "", err
}
}
shared.LogInfo("Image downloaded", ctxMap)
if forContainer {
return fp, dbImageLastAccessInit(d.db, fp)
}
return fp, nil
}