Migrate OCP-80983: verify cgroupv2 is default and v1 cannot be set

Author: Chandan9112

test/extended/node/node_e2e/node.go

@@ -6,6 +6,7 @@ import (
 
 	g "github.com/onsi/ginkgo/v2"
 	o "github.com/onsi/gomega"
+
 	exutil "github.com/openshift/origin/test/extended/util"
 	"k8s.io/apimachinery/pkg/util/wait"
 	e2e "k8s.io/kubernetes/test/e2e/framework"
@@ -74,4 +75,24 @@ var _ = g.Describe("[sig-node] [Jira:Node/Kubelet] Kubelet, CRI-O, CPU manager",
 		}
 		o.Expect(waitErr).NotTo(o.HaveOccurred(), "KUBELET_LOG_LEVEL is not expected, timed out")
 	})
+
+	//author: cmaurya@redhat.com
+	g.It("[OTP] validate cgroupv2 is default", func() {
+		isMicroShift, err := exutil.IsMicroShiftCluster(oc.AdminKubeClient())
+		if err != nil {
+			o.Expect(err).NotTo(o.HaveOccurred(), "error determining if running on MicroShift: %v", err)
+		}
+		if isMicroShift {
+			g.Skip("This test case is not supported in microshift cluster")
+		}
+
+		g.By("1) Check cgroup version")
+		cgroupV := getCgroupVersion(oc)
+		o.Expect(strings.Contains(cgroupV, "cgroup2fs")).Should(o.BeTrue())
+
+		g.By("2) Changing cgroup from v2 to v1 should result in error")
+		output, err := oc.AsAdmin().WithoutNamespace().Run("patch").Args("nodes.config.openshift.io", "cluster", "-p", `{"spec": {"cgroupMode": "v1"}}`, "--type=merge").Output()
+		o.Expect(err).Should(o.HaveOccurred())
+		o.Expect(strings.Contains(output, "Unsupported value: \"v1\"")).Should(o.BeTrue())
+	})
 })

test/extended/node/node_e2e/utils.go

@@ -0,0 +1,24 @@
+package node
+
+import (
+	"strings"
+
+	o "github.com/onsi/gomega"
+
+	exutil "github.com/openshift/origin/test/extended/util"
+	e2e "k8s.io/kubernetes/test/e2e/framework"
+)
+
+func getCgroupVersion(oc *exutil.CLI) string {
+	workerNode, err := oc.AsAdmin().WithoutNamespace().Run("get").Args("nodes", "-l", "node-role.kubernetes.io/worker", "-o=jsonpath={.items[0].metadata.name}").Output()
+	o.Expect(err).NotTo(o.HaveOccurred())
+	cgroupVersion, err := oc.AsAdmin().WithoutNamespace().Run("debug").Args("node/"+workerNode, "-ndefault", "--", "chroot", "/host", "/bin/bash", "-c", "stat -c %T -f /sys/fs/cgroup").Output()
+	o.Expect(err).NotTo(o.HaveOccurred())
+	e2e.Logf("cgroup version info is: [%v]\n", cgroupVersion)
+	if strings.Contains(cgroupVersion, "tmpfs") {
+		return "tmpfs"
+	} else if strings.Contains(cgroupVersion, "cgroup2fs") {
+		return "cgroup2fs"
+	}
+	return cgroupVersion
+}