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kubelet/rkt: enable getting logs for exited pods.

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This commit is contained in:
Yifan Gu 2015-10-05 14:59:10 -07:00
parent ed382ec0a0
commit ba68b095a9
1 changed files with 28 additions and 5 deletions
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33
pkg/kubelet/rkt/rkt.go
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@ -38,6 +38,7 @@ import (
docker "github.com/fsouza/go-dockerclient"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/credentialprovider"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
@ -71,6 +72,10 @@ const (
dockerAuthTemplate = `{"rktKind":"dockerAuth","rktVersion":"v1","registries":[%q],"credentials":{"user":%q,"password":%q}}`
defaultImageTag = "latest"
// The layout of the time format that satisfies the `--since` option for journalctl.
// See man journalctl for more details.
journalSinceLayout = "2006-01-02 15:04:05"
)
// Runtime implements the Containerruntime for rkt. The implementation
@ -1051,7 +1056,7 @@ func (r *Runtime) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, podStatus
// stream the log. Set |follow| to false and specify the number of lines (e.g.
// "100" or "all") to tail the log.
//
// In rkt runtime's implementation, per container log is get via 'journalctl -M [rkt-$UUID] -u [APP_NAME]'.
// In rkt runtime's implementation, per container log is get via 'journalctl -m _HOSTNAME=[rkt-$UUID] -u [APP_NAME]'.
// See https://github.com/coreos/rkt/blob/master/Documentation/commands.md#logging for more details.
//
// TODO(yifan): If the rkt is using lkvm as the stage1 image, then this function will fail.
@ -1061,15 +1066,33 @@ func (r *Runtime) GetContainerLogs(pod *api.Pod, containerID kubecontainer.Conta
return err
}
cmd := exec.Command("journalctl", "-M", fmt.Sprintf("rkt-%s", id.uuid), "-u", id.appName)
cmd := exec.Command("journalctl", "-m", fmt.Sprintf("_HOSTNAME=rkt-%s", id.uuid), "-u", id.appName, "-a")
// If no timestamps are required, then only returns the pure logs from the app without
// any metadata.
if !logOptions.Timestamps {
cmd.Args = append(cmd.Args, "-o", "cat")
}
if logOptions.Follow {
cmd.Args = append(cmd.Args, "-f")
}
if logOptions.TailLines == nil {
cmd.Args = append(cmd.Args, "-a")
} else {
if logOptions.TailLines != nil {
cmd.Args = append(cmd.Args, "-n", strconv.FormatInt(*logOptions.TailLines, 10))
}
var since int64
if logOptions.SinceSeconds != nil {
t := unversioned.Now().Add(-time.Duration(*logOptions.SinceSeconds) * time.Second)
since = t.Unix()
}
if logOptions.SinceTime != nil {
since = logOptions.SinceTime.Unix()
}
cmd.Args = append(cmd.Args, "--since", time.Unix(since, 0).Format(journalSinceLayout))
cmd.Stdout, cmd.Stderr = stdout, stderr
return cmd.Run()
}