Add a standalone test utility for cgroup package.
Although it has some overlap with nsinit utility, it is useful to test cgroup functinality directly and try out new or internal features not exposed through nsinit. It still needs some work as I haven't added enough systemd support yet. I also need to expose an enter method. Docker-DCO-1.1-Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
This commit is contained in:
Rohit Jnagal
parent
d712d29b9a
commit
c1d25c185e
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package main
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import (
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"encoding/json"
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"fmt"
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"log"
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"os"
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"syscall"
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"time"
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"github.com/codegangsta/cli"
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"github.com/docker/libcontainer/cgroups"
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"github.com/docker/libcontainer/cgroups/fs"
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"github.com/docker/libcontainer/cgroups/systemd"
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)
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var createCommand = cli.Command{
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Name: "create",
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Usage: "Create a cgroup container using the supplied configuration and initial process.",
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Flags: []cli.Flag{
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cli.StringFlag{"config, c", "cgroup.json", "path to container configuration"},
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cli.IntFlag{"pid, p", 0, "pid of the initial process in the container"},
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},
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Action: createAction,
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}
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var destroyCommand = cli.Command{
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Name: "destroy",
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Usage: "Destroy an existing cgroup container.",
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Flags: []cli.Flag{
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cli.StringFlag{"name, n", "", "container name"},
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cli.StringFlag{"parent, p", "", "container parent"},
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},
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Action: destroyAction,
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}
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var statsCommand = cli.Command{
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Name: "stats",
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Usage: "Get stats for cgroup",
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Flags: []cli.Flag{
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cli.StringFlag{"name, n", "", "container name"},
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cli.StringFlag{"parent, p", "", "container parent"},
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},
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Action: statsAction,
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}
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var pauseCommand = cli.Command{
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Name: "pause",
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Usage: "Pause cgroup",
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Flags: []cli.Flag{
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cli.StringFlag{"name, n", "", "container name"},
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cli.StringFlag{"parent, p", "", "container parent"},
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},
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Action: pauseAction,
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}
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var resumeCommand = cli.Command{
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Name: "resume",
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Usage: "Resume a paused cgroup",
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Flags: []cli.Flag{
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cli.StringFlag{"name, n", "", "container name"},
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cli.StringFlag{"parent, p", "", "container parent"},
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},
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Action: resumeAction,
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}
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var psCommand = cli.Command{
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Name: "ps",
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Usage: "Get list of pids for a cgroup",
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Flags: []cli.Flag{
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cli.StringFlag{"name, n", "", "container name"},
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cli.StringFlag{"parent, p", "", "container parent"},
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},
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Action: psAction,
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}
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func loadConfig(c *cli.Context) (*cgroups.Cgroup, error) {
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f, err := os.Open(c.String("config"))
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var config *cgroups.Cgroup
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if err := json.NewDecoder(f).Decode(&config); err != nil {
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log.Fatal(err)
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}
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return config, nil
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}
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func openLog(name string) error {
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f, err := os.OpenFile(name, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0755)
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if err != nil {
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return err
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}
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log.SetOutput(f)
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return nil
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}
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func getConfig(context *cli.Context) (*cgroups.Cgroup, error) {
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name := context.String("name")
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if name == "" {
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log.Fatal(fmt.Errorf("Missing container name"))
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}
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parent := context.String("parent")
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return &cgroups.Cgroup{
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Name: name,
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Parent: parent,
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}, nil
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}
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func killAll(config *cgroups.Cgroup) {
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// We could use freezer here to prevent process spawning while we are trying
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// to kill everything. But going with more portable solution of retrying for
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// now.
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pids := getPids(config)
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killPids(pids)
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retry := 10
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for len(pids) != 0 || retry > 0 {
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killPids(pids)
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time.Sleep(100 * time.Millisecond)
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retry--
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pids = getPids(config)
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}
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if len(pids) != 0 {
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log.Fatal(fmt.Errorf("Could not kill existing processes in the container."))
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}
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}
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func getPids(config *cgroups.Cgroup) []int {
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pids, err := fs.GetPids(config)
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if err != nil {
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log.Fatal(err)
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}
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return pids
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}
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func killPids(pids []int) {
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for _, pid := range pids {
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// pids might go away on their own. Ignore errors.
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syscall.Kill(pid, syscall.SIGKILL)
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}
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}
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func setFreezerState(context *cli.Context, state cgroups.FreezerState) {
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config, err := getConfig(context)
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if err != nil {
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log.Fatal(err)
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}
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if systemd.UseSystemd() {
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err = systemd.Freeze(config, state)
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} else {
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err = fs.Freeze(config, state)
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}
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if err != nil {
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log.Fatal(err)
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}
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}
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func createAction(context *cli.Context) {
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config, err := loadConfig(context)
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if err != nil {
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log.Fatal(err)
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}
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pid := context.Int("pid")
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if pid <= 0 {
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log.Fatal(fmt.Errorf("Invalid pid : %d", pid))
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}
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if systemd.UseSystemd() {
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_, err := systemd.Apply(config, pid)
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if err != nil {
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log.Fatal(err)
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}
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} else {
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_, err := fs.Apply(config, pid)
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if err != nil {
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log.Fatal(err)
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}
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}
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}
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func destroyAction(context *cli.Context) {
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config, err := getConfig(context)
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if err != nil {
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log.Fatal(err)
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}
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killAll(config)
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// Systemd will clean up cgroup state for empty container.
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if !systemd.UseSystemd() {
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err := fs.Cleanup(config)
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if err != nil {
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log.Fatal(err)
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}
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}
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}
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func statsAction(context *cli.Context) {
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config, err := getConfig(context)
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if err != nil {
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log.Fatal(err)
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}
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stats, err := fs.GetStats(config)
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if err != nil {
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log.Fatal(err)
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}
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out, err := json.MarshalIndent(stats, "", "\t")
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Usage stats for '%s':\n %v\n", config.Name, string(out))
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}
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func pauseAction(context *cli.Context) {
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setFreezerState(context, cgroups.Frozen)
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}
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func resumeAction(context *cli.Context) {
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setFreezerState(context, cgroups.Thawed)
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}
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func psAction(context *cli.Context) {
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config, err := getConfig(context)
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if err != nil {
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log.Fatal(err)
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}
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pids, err := fs.GetPids(config)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Pids in '%s':\n", config.Name)
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fmt.Println(pids)
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}
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func main() {
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logPath := os.Getenv("log")
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if logPath != "" {
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if err := openLog(logPath); err != nil {
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log.Fatal(err)
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}
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}
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app := cli.NewApp()
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app.Name = "cgutil"
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app.Usage = "Test utility for libcontainer cgroups package"
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app.Version = "0.1"
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app.Commands = []cli.Command{
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createCommand,
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destroyCommand,
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statsCommand,
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pauseCommand,
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resumeCommand,
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psCommand,
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}
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if err := app.Run(os.Args); err != nil {
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log.Fatal(err)
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}
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}
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@ -0,0 +1,10 @@
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{
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"name": "luke",
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"parent": "darth",
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"allow_all_devices": true,
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"memory": 1073741824,
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"memory_swap": -1,
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"cpu_shares": 2048,
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"cpu_quota": 500000,
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"cpu_period": 250000
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}
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