func InitPidfile(job *engine.Job) engine.Status {
if len(job.Args) == 0 {
return job.Error(fmt.Errorf("no pidfile provided to initialize"))
}
job.Logf("Creating pidfile")
if err := utils.CreatePidFile(job.Args[0]); err != nil {
return job.Error(err)
}
return engine.StatusOK
}
func NewDaemonFromDirectory(config *Config, eng *engine.Engine) (*Daemon, error) {
if config.Mtu == 0 {
config.Mtu = getDefaultNetworkMtu()
}
// Check for mutually incompatible config options
if config.BridgeIface != "" && config.BridgeIP != "" {
return nil, fmt.Errorf("You specified -b & --bip, mutually exclusive options. Please specify only one.")
}
if !config.EnableIptables && !config.InterContainerCommunication {
return nil, fmt.Errorf("You specified --iptables=false with --icc=false. ICC uses iptables to function. Please set --icc or --iptables to true.")
}
if !config.EnableIptables && config.EnableIpMasq {
config.EnableIpMasq = false
}
config.DisableNetwork = config.BridgeIface == disableNetworkBridge
// Claim the pidfile first, to avoid any and all unexpected race conditions.
// Some of the init doesn't need a pidfile lock - but let's not try to be smart.
if config.Pidfile != "" {
if err := utils.CreatePidFile(config.Pidfile); err != nil {
return nil, err
}
eng.OnShutdown(func() {
// Always release the pidfile last, just in case
utils.RemovePidFile(config.Pidfile)
})
}
// Check that the system is supported and we have sufficient privileges
if runtime.GOOS != "linux" {
return nil, fmt.Errorf("The Docker daemon is only supported on linux")
}
if os.Geteuid() != 0 {
return nil, fmt.Errorf("The Docker daemon needs to be run as root")
}
if err := checkKernelAndArch(); err != nil {
return nil, err
}
// set up the TempDir to use a canonical path
tmp, err := utils.TempDir(config.Root)
if err != nil {
return nil, fmt.Errorf("Unable to get the TempDir under %s: %s", config.Root, err)
}
realTmp, err := utils.ReadSymlinkedDirectory(tmp)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to the TempDir (%s): %s", tmp, err)
}
os.Setenv("TMPDIR", realTmp)
if !config.EnableSelinuxSupport {
selinuxSetDisabled()
}
// get the canonical path to the Docker root directory
var realRoot string
if _, err := os.Stat(config.Root); err != nil && os.IsNotExist(err) {
realRoot = config.Root
} else {
realRoot, err = utils.ReadSymlinkedDirectory(config.Root)
if err != nil {
return nil, fmt.Errorf("Unable to get the full path to root (%s): %s", config.Root, err)
}
}
config.Root = realRoot
// Create the root directory if it doesn't exists
if err := os.MkdirAll(config.Root, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Set the default driver
graphdriver.DefaultDriver = config.GraphDriver
// Load storage driver
driver, err := graphdriver.New(config.Root, config.GraphOptions)
if err != nil {
return nil, err
}
log.Debugf("Using graph driver %s", driver)
// As Docker on btrfs and SELinux are incompatible at present, error on both being enabled
if selinuxEnabled() && config.EnableSelinuxSupport && driver.String() == "btrfs" {
return nil, fmt.Errorf("SELinux is not supported with the BTRFS graph driver!")
}
daemonRepo := path.Join(config.Root, "containers")
if err := os.MkdirAll(daemonRepo, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
// Migrate the container if it is aufs and aufs is enabled
if err = migrateIfAufs(driver, config.Root); err != nil {
return nil, err
}
log.Debugf("Creating images graph")
g, err := graph.NewGraph(path.Join(config.Root, "graph"), driver)
if err != nil {
return nil, err
}
volumesDriver, err := graphdriver.GetDriver("vfs", config.Root, config.GraphOptions)
if err != nil {
return nil, err
}
volumes, err := volumes.NewRepository(path.Join(config.Root, "volumes"), volumesDriver)
if err != nil {
return nil, err
}
trustKey, err := api.LoadOrCreateTrustKey(config.TrustKeyPath)
if err != nil {
return nil, err
}
log.Debugf("Creating repository list")
repositories, err := graph.NewTagStore(path.Join(config.Root, "repositories-"+driver.String()), g, trustKey)
if err != nil {
return nil, fmt.Errorf("Couldn't create Tag store: %s", err)
}
trustDir := path.Join(config.Root, "trust")
if err := os.MkdirAll(trustDir, 0700); err != nil && !os.IsExist(err) {
return nil, err
}
t, err := trust.NewTrustStore(trustDir)
if err != nil {
return nil, fmt.Errorf("could not create trust store: %s", err)
}
if !config.DisableNetwork {
job := eng.Job("init_networkdriver")
job.SetenvBool("EnableIptables", config.EnableIptables)
job.SetenvBool("InterContainerCommunication", config.InterContainerCommunication)
job.SetenvBool("EnableIpForward", config.EnableIpForward)
job.SetenvBool("EnableIpMasq", config.EnableIpMasq)
job.SetenvBool("EnableIPv6", config.EnableIPv6)
job.Setenv("BridgeIface", config.BridgeIface)
job.Setenv("BridgeIP", config.BridgeIP)
job.Setenv("FixedCIDR", config.FixedCIDR)
job.Setenv("FixedCIDRv6", config.FixedCIDRv6)
job.Setenv("DefaultBindingIP", config.DefaultIp.String())
if err := job.Run(); err != nil {
return nil, err
}
}
graphdbPath := path.Join(config.Root, "linkgraph.db")
graph, err := graphdb.NewSqliteConn(graphdbPath)
if err != nil {
return nil, err
}
localCopy := path.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION))
sysInitPath := utils.DockerInitPath(localCopy)
if sysInitPath == "" {
return nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.com/contributing/devenvironment for official build instructions.")
}
if sysInitPath != localCopy {
// When we find a suitable dockerinit binary (even if it's our local binary), we copy it into config.Root at localCopy for future use (so that the original can go away without that being a problem, for example during a package upgrade).
if err := os.Mkdir(path.Dir(localCopy), 0700); err != nil && !os.IsExist(err) {
return nil, err
}
if _, err := utils.CopyFile(sysInitPath, localCopy); err != nil {
return nil, err
}
if err := os.Chmod(localCopy, 0700); err != nil {
return nil, err
}
sysInitPath = localCopy
}
sysInfo := sysinfo.New(false)
ed, err := execdrivers.NewDriver(config.ExecDriver, config.Root, sysInitPath, sysInfo)
if err != nil {
return nil, err
}
daemon := &Daemon{
ID: trustKey.PublicKey().KeyID(),
repository: daemonRepo,
containers: &contStore{s: make(map[string]*Container)},
execCommands: newExecStore(),
graph: g,
repositories: repositories,
idIndex: truncindex.NewTruncIndex([]string{}),
sysInfo: sysInfo,
volumes: volumes,
config: config,
containerGraph: graph,
driver: driver,
sysInitPath: sysInitPath,
execDriver: ed,
eng: eng,
trustStore: t,
}
if err := daemon.restore(); err != nil {
return nil, err
}
// set up filesystem watch on resolv.conf for network changes
if err := daemon.setupResolvconfWatcher(); err != nil {
return nil, err
}
// Setup shutdown handlers
// FIXME: can these shutdown handlers be registered closer to their source?
eng.OnShutdown(func() {
// FIXME: if these cleanup steps can be called concurrently, register
// them as separate handlers to speed up total shutdown time
if err := daemon.shutdown(); err != nil {
log.Errorf("daemon.shutdown(): %s", err)
}
if err := portallocator.ReleaseAll(); err != nil {
log.Errorf("portallocator.ReleaseAll(): %s", err)
}
if err := daemon.driver.Cleanup(); err != nil {
log.Errorf("daemon.driver.Cleanup(): %s", err.Error())
}
if err := daemon.containerGraph.Close(); err != nil {
log.Errorf("daemon.containerGraph.Close(): %s", err.Error())
}
})
return daemon, nil
}