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Restart containers based on restart policy

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Signed-off-by: Michael Crosby <michael@docker.com>
This commit is contained in:
Michael Crosby 2014-08-04 15:53:10 -07:00
parent 0d70706b4b
commit bd8c9dc239
3 changed files with 103 additions and 41 deletions
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140
daemon/container.go
View file

@ -7,6 +7,7 @@ import (
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
@ -75,6 +76,7 @@ type Container struct {
daemon *Daemon
MountLabel, ProcessLabel string
RestartCount int
Volumes map[string]string
// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
@ -82,7 +84,8 @@ type Container struct {
VolumesRW map[string]bool
hostConfig *runconfig.HostConfig
activeLinks map[string]*links.Link
activeLinks map[string]*links.Link
requestedStop bool
}
func (container *Container) FromDisk() error {
@ -277,6 +280,7 @@ func (container *Container) Start() (err error) {
if container.State.IsRunning() {
return nil
}
// if we encounter and error during start we need to ensure that any other
// setup has been cleaned up properly
defer func() {
@ -312,9 +316,6 @@ func (container *Container) Start() (err error) {
if err := setupMountsForContainer(container); err != nil {
return err
}
if err := container.startLoggingToDisk(); err != nil {
return err
}
return container.waitForStart()
}
@ -497,35 +498,105 @@ func (container *Container) releaseNetwork() {
func (container *Container) monitor(callback execdriver.StartCallback) error {
var (
err error
exitCode int
err error
exitCode int
failCount int
)
pipes := execdriver.NewPipes(container.stdin, container.stdout, container.stderr, container.Config.OpenStdin)
exitCode, err = container.daemon.Run(container, pipes, callback)
if err != nil {
log.Errorf("Error running container: %s", err)
}
container.State.SetStopped(exitCode)
// reset the restart count
container.RestartCount = -1
container.requestedStop = false
// Cleanup
container.cleanup()
for {
container.RestartCount++
// Re-create a brand new stdin pipe once the container exited
if container.Config.OpenStdin {
container.stdin, container.stdinPipe = io.Pipe()
}
container.LogEvent("die")
// If the engine is shutting down, don't save the container state as stopped.
// This will cause it to be restarted when the engine is restarted.
if container.daemon != nil && container.daemon.eng != nil && !container.daemon.eng.IsShutdown() {
if err := container.toDisk(); err != nil {
log.Errorf("Error dumping container %s state to disk: %s\n", container.ID, err)
pipes := execdriver.NewPipes(container.stdin, container.stdout, container.stderr, container.Config.OpenStdin)
if err := container.startLoggingToDisk(); err != nil {
return err
}
if exitCode, err = container.daemon.Run(container, pipes, callback); err != nil {
failCount++
if failCount == 100 {
return err
}
utils.Errorf("Error running container: %s", err)
}
// We still wait to set the state as stopped and ensure that the locks were released
container.State.SetStopped(exitCode)
if container.Config.OpenStdin {
if err := container.stdin.Close(); err != nil {
utils.Errorf("%s: Error close stdin: %s", container.ID, err)
}
}
if err := container.stdout.Clean(); err != nil {
utils.Errorf("%s: Error close stdout: %s", container.ID, err)
}
if err := container.stderr.Clean(); err != nil {
utils.Errorf("%s: Error close stderr: %s", container.ID, err)
}
if container.command != nil && container.command.Terminal != nil {
if err := container.command.Terminal.Close(); err != nil {
utils.Errorf("%s: Error closing terminal: %s", container.ID, err)
}
}
// Re-create a brand new stdin pipe once the container exited
if container.Config.OpenStdin {
container.stdin, container.stdinPipe = io.Pipe()
}
if container.daemon != nil && container.daemon.srv != nil {
container.daemon.srv.LogEvent("die", container.ID, container.daemon.repositories.ImageName(container.Image))
}
policy := container.hostConfig.RestartPolicy
if (policy == "always" || (policy == "on-failure" && exitCode != 0)) && !container.requestedStop {
container.command.Cmd = copyCmd(&container.command.Cmd)
time.Sleep(1 * time.Second)
} else {
// do not restart the container, let it die
// Cleanup networking and mounts
container.cleanup()
if container.daemon != nil && container.daemon.srv != nil && container.daemon.srv.IsRunning() {
// FIXME: here is race condition between two RUN instructions in Dockerfile
// because they share same runconfig and change image. Must be fixed
// in builder/builder.go
if err := container.toDisk(); err != nil {
utils.Errorf("Error dumping container %s state to disk: %s\n", container.ID, err)
}
}
return err
}
}
return err
}
func copyCmd(c *exec.Cmd) exec.Cmd {
return exec.Cmd{
Stdin: c.Stdin,
Stdout: c.Stdout,
Stderr: c.Stderr,
Path: c.Path,
Env: c.Env,
ExtraFiles: c.ExtraFiles,
Args: c.Args,
Dir: c.Dir,
SysProcAttr: c.SysProcAttr,
}
}
// cleanup releases any network resources allocated to the container along with any rules
// around how containers are linked together. It also unmounts the container's root filesystem.
func (container *Container) cleanup() {
container.releaseNetwork()
@ -535,22 +606,6 @@ func (container *Container) cleanup() {
link.Disable()
}
}
if container.Config.OpenStdin {
if err := container.stdin.Close(); err != nil {
log.Errorf("%s: Error close stdin: %s", container.ID, err)
}
}
if err := container.stdout.Clean(); err != nil {
log.Errorf("%s: Error close stdout: %s", container.ID, err)
}
if err := container.stderr.Clean(); err != nil {
log.Errorf("%s: Error close stderr: %s", container.ID, err)
}
if container.command != nil && container.command.Terminal != nil {
if err := container.command.Terminal.Close(); err != nil {
log.Errorf("%s: Error closing terminal: %s", container.ID, err)
}
}
if err := container.Unmount(); err != nil {
log.Errorf("%v: Failed to umount filesystem: %v", container.ID, err)
@ -570,6 +625,8 @@ func (container *Container) KillSig(sig int) error {
if !container.State.IsRunning() {
return nil
}
container.requestedStop = true
return container.daemon.Kill(container, sig)
}
@ -1122,6 +1179,7 @@ func (container *Container) waitForStart() error {
c.Close()
}
}
container.State.SetRunning(command.Pid())
if err := container.toDisk(); err != nil {
log.Debugf("%s", err)

2
runconfig/hostconfig.go
View file

@ -40,6 +40,7 @@ type HostConfig struct {
NetworkMode NetworkMode
CapAdd []string
CapDrop []string
RestartPolicy string
}
func ContainerHostConfigFromJob(job *engine.Job) *HostConfig {
@ -48,6 +49,7 @@ func ContainerHostConfigFromJob(job *engine.Job) *HostConfig {
Privileged: job.GetenvBool("Privileged"),
PublishAllPorts: job.GetenvBool("PublishAllPorts"),
NetworkMode: NetworkMode(job.Getenv("NetworkMode")),
RestartPolicy: job.Getenv("RestartPolicy"),
}
job.GetenvJson("LxcConf", &hostConfig.LxcConf)
job.GetenvJson("PortBindings", &hostConfig.PortBindings)

2
runconfig/parse.go
View file

@ -71,6 +71,7 @@ func parseRun(cmd *flag.FlagSet, args []string, sysInfo *sysinfo.SysInfo) (*Conf
flCpuShares = cmd.Int64([]string{"c", "-cpu-shares"}, 0, "CPU shares (relative weight)")
flCpuset = cmd.String([]string{"-cpuset"}, "", "CPUs in which to allow execution (0-3, 0,1)")
flNetMode = cmd.String([]string{"-net"}, "bridge", "Set the Network mode for the container\n'bridge': creates a new network stack for the container on the docker bridge\n'none': no networking for this container\n'container:<name|id>': reuses another container network stack\n'host': use the host network stack inside the container. Note: the host mode gives the container full access to local system services such as D-bus and is therefore considered insecure.")
flRestartPolicy = cmd.String([]string{"-restart"}, "", "Restart policy when the dies")
// For documentation purpose
_ = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy received signals to the process (even in non-TTY mode). SIGCHLD, SIGSTOP, and SIGKILL are not proxied.")
_ = cmd.String([]string{"#name", "-name"}, "", "Assign a name to the container")
@ -271,6 +272,7 @@ func parseRun(cmd *flag.FlagSet, args []string, sysInfo *sysinfo.SysInfo) (*Conf
Devices: deviceMappings,
CapAdd: flCapAdd.GetAll(),
CapDrop: flCapDrop.GetAll(),
RestartPolicy: *flRestartPolicy,
}
if sysInfo != nil && flMemory > 0 && !sysInfo.SwapLimit {