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Merge pull request #51634 from verb/sharedpid-default-off

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Automatic merge from submit-queue (batch tested with PRs 51984, 51351, 51873, 51795, 51634)

Revert to using isolated PID namespaces in Docker

**What this PR does / why we need it**: Reverts to the previous docker default of using isolated PID namespaces for containers in a pod. There exist container images that expect always to be PID 1 which we want to support unmodified in 1.8.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #48937

**Special notes for your reviewer**:

**Release note**:

```release-note
Sharing a PID namespace between containers in a pod is disabled by default in 1.8. To enable for a node, use the --docker-disable-shared-pid=false kubelet flag. Note that PID namespace sharing requires docker >= 1.13.1.
```
This commit is contained in:
Kubernetes Submit Queue 2017-09-05 18:40:33 -07:00 committed by GitHub
commit eb86cc5e87
4 changed files with 7 additions and 5 deletions
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1
cmd/kubelet/app/options/container_runtime.go
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@ -108,6 +108,7 @@ func NewContainerRuntimeOptions() *ContainerRuntimeOptions {
DockerEndpoint: dockerEndpoint,
DockershimRootDirectory: "/var/lib/dockershim",
DockerExecHandlerName: "native",
DockerDisableSharedPID: true,
PodSandboxImage: defaultPodSandboxImage,
ImagePullProgressDeadline: metav1.Duration{Duration: 1 * time.Minute},
RktAPIEndpoint: defaultRktAPIServiceEndpoint,

6
test/e2e_node/docker_test.go
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@ -41,11 +41,11 @@ var _ = framework.KubeDescribe("Docker features [Feature:Docker]", func() {
It("processes in different containers of the same pod should be able to see each other", func() {
// TODO(yguo0905): Change this test to run unless the runtime is
// Docker and its version is <1.13.
By("Check whether shared PID namespace is enabled.")
isEnabled, err := isSharedPIDNamespaceEnabled()
By("Check whether shared PID namespace is supported.")
isEnabled, err := isSharedPIDNamespaceSupported()
framework.ExpectNoError(err)
if !isEnabled {
framework.Skipf("Skipped because shared PID namespace is not enabled.")
framework.Skipf("Skipped because shared PID namespace is not supported by this docker version.")
}
By("Create a pod with two containers.")

4
test/e2e_node/docker_util.go
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@ -43,9 +43,9 @@ func getDockerAPIVersion() (semver.Version, error) {
return semver.MustParse(version.APIVersion + ".0"), nil
}
// isSharedPIDNamespaceEnabled returns true if the Docker version is 1.13.1+
// isSharedPIDNamespaceSupported returns true if the Docker version is 1.13.1+
// (API version 1.26+), and false otherwise.
func isSharedPIDNamespaceEnabled() (bool, error) {
func isSharedPIDNamespaceSupported() (bool, error) {
version, err := getDockerAPIVersion()
if err != nil {
return false, err

1
test/e2e_node/services/kubelet.go
View File

@ -155,6 +155,7 @@ func (e *E2EServices) startKubelet() (*server, error) {
"--serialize-image-pulls", "false",
"--pod-manifest-path", manifestPath,
"--file-check-frequency", "10s", // Check file frequently so tests won't wait too long
"--docker-disable-shared-pid=false",
// Assign a fixed CIDR to the node because there is no node controller.
//
// Note: this MUST be in sync with with the IP in