Merge pull request #17168 from danishprakash/add-host-pid

kube-play: add support for HostPID

docs/kubernetes_support.md

@@ -47,7 +47,7 @@ Note: **N/A** means that the option cannot be supported in a single-node Podman
 | dnsConfig.searches                                | ✅      |
 | dnsPolicy                                         |         |
 | hostNetwork                                       | ✅      |
-| hostPID                                           |         |
+| hostPID                                           | ✅      |
 | hostIPC                                           |         |
 | shareProcessNamespace                             | ✅      |
 | serviceAccountName                                |         |

pkg/domain/infra/abi/play.go

@@ -722,6 +722,7 @@ func (ic *ContainerEngine) playKubePod(ctx context.Context, podName string, podY
 			RestartPolicy:      ctrRestartPolicy,
 			SeccompPaths:       seccompPaths,
 			SecretsManager:     secretsManager,
+			PidNSIsHost:        p.Pid.IsHost(),
 			UserNSIsHost:       p.Userns.IsHost(),
 			Volumes:            volumes,
 		}

pkg/specgen/generate/kube/kube.go

@@ -53,6 +53,9 @@ func ToPodOpt(ctx context.Context, podName string, p entities.PodCreateOptions,
 	if podYAML.Spec.ShareProcessNamespace != nil && *podYAML.Spec.ShareProcessNamespace {
 		p.Share = append(p.Share, "pid")
 	}
+	if podYAML.Spec.HostPID {
+		p.Pid = "host"
+	}
 	p.Hostname = podYAML.Spec.Hostname
 	if p.Hostname == "" {
 		p.Hostname = podName
@@ -131,6 +134,8 @@ type CtrSpecGenOptions struct {
 	NetNSIsHost bool
 	// UserNSIsHost tells the container to use the host userns
 	UserNSIsHost bool
+	// PidNSIsHost tells the container to use the host pidns
+	PidNSIsHost bool
 	// SecretManager to access the secrets
 	SecretsManager *secrets.SecretsManager
 	// LogDriver which should be used for the container
@@ -462,6 +467,9 @@ func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGener
 	if opts.UserNSIsHost {
 		s.UserNS.NSMode = specgen.Host
 	}
+	if opts.PidNSIsHost {
+		s.PidNS.NSMode = specgen.Host
+	}
 
 	// Add labels that come from kube
 	if len(s.Labels) == 0 {

test/e2e/play_kube_test.go

@@ -940,6 +940,19 @@ spec:
       protocol: tcp
 `
 
+var podWithHostPIDDefined = `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: test-hostpid
+spec:
+  hostPID: true
+  containers:
+  - name: alpine
+    image: quay.io/libpod/alpine:latest
+    command: ['sh', '-c', 'echo $$']
+`
+
 var (
 	defaultCtrName        = "testCtr"
 	defaultCtrCmd         = []string{"top"}
@@ -4931,4 +4944,24 @@ spec:
 		Expect(strings.Count(kube.OutputToString(), "Pod:")).To(Equal(1))
 		Expect(strings.Count(kube.OutputToString(), "Container:")).To(Equal(1))
 	})
+
+	It("podman play kube test with hostPID", func() {
+		err := writeYaml(podWithHostPIDDefined, kubeYaml)
+		Expect(err).ToNot(HaveOccurred())
+
+		kube := podmanTest.Podman([]string{"play", "kube", kubeYaml})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube).Should(Exit(0))
+
+		logs := podmanTest.Podman([]string{"pod", "logs", "-c", "test-hostpid-alpine", "test-hostpid"})
+		logs.WaitWithDefaultTimeout()
+		Expect(logs).Should(Exit(0))
+		Expect(logs.OutputToString()).To(Not(Equal("1")), "PID should never be 1 because of host pidns")
+
+		inspect := podmanTest.Podman([]string{"inspect", "test-hostpid-alpine", "--format", "{{ .HostConfig.PidMode }}"})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect).Should(Exit(0))
+		Expect(inspect.OutputToString()).To(Equal("host"))
+	})
+
 })