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Fix detection of docker cgroup on RHEL

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Check docker's pid file, then fallback to pidof when trying to determine the pid for docker. The
latest docker RPM for RHEL changes /usr/bin/docker from an executable to a shell script (to support
/usr/bin/docker-current and /usr/bin/docker-latest). The pidof check for docker fails in this case,
so we check /var/run/docker.pid first (the default location), and fallback to pidof if that fails.
This commit is contained in:
Andy Goldstein 2016-05-19 15:44:42 -04:00
parent 9784dff94e
commit 6744a7417a
1 changed files with 40 additions and 5 deletions
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45
pkg/kubelet/cm/container_manager_linux.go
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@ -20,6 +20,7 @@ package cm
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
@ -39,6 +40,7 @@ import (
utilerrors "k8s.io/kubernetes/pkg/util/errors"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/util/oom"
"k8s.io/kubernetes/pkg/util/runtime"
"k8s.io/kubernetes/pkg/util/sets"
utilsysctl "k8s.io/kubernetes/pkg/util/sysctl"
"k8s.io/kubernetes/pkg/util/wait"
@ -51,6 +53,9 @@ const (
DockerMemoryLimitThresholdPercent = 70
// The minimum memory limit allocated to docker container: 150Mi
MinDockerMemoryLimit = 150 * 1024 * 1024
dockerProcessName = "docker"
dockerPidFile = "/var/run/docker.pid"
)
// A non-user container tracked by the Kubelet.
@ -262,11 +267,12 @@ func (cm *containerManagerImpl) setupNode() error {
systemContainers = append(systemContainers, cont)
} else {
cm.periodicTasks = append(cm.periodicTasks, func() {
cont, err := getContainerNameForProcess("docker")
cont, err := getContainerNameForProcess(dockerProcessName, dockerPidFile)
if err != nil {
glog.Error(err)
return
}
glog.V(2).Infof("Discovered runtime cgroups name: %s", cont)
cm.Lock()
defer cm.Unlock()
cm.RuntimeCgroupsName = cont
@ -324,8 +330,8 @@ func (cm *containerManagerImpl) setupNode() error {
return nil
}
func getContainerNameForProcess(name string) (string, error) {
pids, err := getPidsForProcess(name)
func getContainerNameForProcess(name, pidFile string) (string, error) {
pids, err := getPidsForProcess(name, pidFile)
if err != nil {
return "", fmt.Errorf("failed to detect process id for %q - %v", name, err)
}
@ -418,7 +424,36 @@ func isProcessRunningInHost(pid int) (bool, error) {
return initMntNs == processMntNs, nil
}
func getPidsForProcess(name string) ([]int, error) {
func getPidFromPidFile(pidFile string) (int, error) {
file, err := os.Open(pidFile)
if err != nil {
return 0, fmt.Errorf("error opening pid file %s: %v", pidFile, err)
}
defer file.Close()
data, err := ioutil.ReadAll(file)
if err != nil {
return 0, fmt.Errorf("error reading pid file %s: %v", pidFile, err)
}
pid, err := strconv.Atoi(string(data))
if err != nil {
return 0, fmt.Errorf("error parsing %s as a number: %v", string(data), err)
}
return pid, nil
}
func getPidsForProcess(name, pidFile string) ([]int, error) {
if len(pidFile) > 0 {
if pid, err := getPidFromPidFile(pidFile); err == nil {
return []int{pid}, nil
} else {
// log the error and fall back to pidof
runtime.HandleError(err)
}
}
out, err := exec.Command("pidof", name).Output()
if err != nil {
return []int{}, fmt.Errorf("failed to find pid of %q: %v", name, err)
@ -438,7 +473,7 @@ func getPidsForProcess(name string) ([]int, error) {
// Ensures that the Docker daemon is in the desired container.
func ensureDockerInContainer(cadvisor cadvisor.Interface, oomScoreAdj int, manager *fs.Manager) error {
pids, err := getPidsForProcess("docker")
pids, err := getPidsForProcess(dockerProcessName, dockerPidFile)
if err != nil {
return err
}