Merge pull request #67628 from zouyee/centos-config

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Supplementary information for common flags and add restart second config

**What this PR does / why we need it**:
the admission-control flag has been marked deprecated, it need to be updated.
And provide them  with supplementary information about flags.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes https://github.com/kubernetes/kubernetes/issues/67627

**Special notes for your reviewer**:

**Release note**:

```NONE

```

cluster/centos/master/scripts/apiserver.sh

@@ -66,6 +66,8 @@ KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=${SERVICE_CLUSTER_IP_RANGE}"
 #   LimitRanger, AlwaysDeny, SecurityContextDeny, NamespaceExists,
 #   NamespaceLifecycle, NamespaceAutoProvision, AlwaysAdmit,
 #   ServiceAccount, DefaultStorageClass, DefaultTolerationSeconds, ResourceQuota
+# Mark Deprecated. Use --enable-admission-plugins or --disable-admission-plugins instead since v1.10.
+# It will be removed in a future version.
 KUBE_ADMISSION_CONTROL="--admission-control=${ADMISSION_CONTROL}"
 
 # --client-ca-file="": If set, any request presenting a client certificate signed

cluster/centos/master/scripts/controller-manager.sh

@@ -30,7 +30,8 @@ KUBE_CONTROLLER_MANAGER_ROOT_CA_FILE="--root-ca-file=/srv/kubernetes/ca.crt"
 # RSA key used to sign service account tokens.
 KUBE_CONTROLLER_MANAGER_SERVICE_ACCOUNT_PRIVATE_KEY_FILE="--service-account-private-key-file=/srv/kubernetes/server.key"
 
-# --leader-elect
+# --leader-elect: Start a leader election client and gain leadership before 
+# executing the main loop. Enable this when running replicated components for high availability.
 KUBE_LEADER_ELECT="--leader-elect"
 EOF
 

cluster/centos/master/scripts/scheduler.sh

@@ -27,9 +27,11 @@ KUBE_LOGTOSTDERR="--logtostderr=true"
 # --v=0: log level for V logs
 KUBE_LOG_LEVEL="--v=4"
 
+# --master: The address of the Kubernetes API server (overrides any value in kubeconfig).
 KUBE_MASTER="--master=${MASTER_ADDRESS}:8080"
 
-# --leader-elect
+# --leader-elect: Start a leader election client and gain leadership before 
+# executing the main loop. Enable this when running replicated components for high availability.
 KUBE_LEADER_ELECT="--leader-elect"
 
 # Add your own!

cluster/centos/node/scripts/kubelet.sh

@@ -87,6 +87,7 @@ EnvironmentFile=-/opt/kubernetes/cfg/kubelet
 ExecStart=/opt/kubernetes/bin/kubelet ${KUBELET_OPTS}
 Restart=on-failure
 KillMode=process
+RestartSec=15s
 
 [Install]
 WantedBy=multi-user.target