improvement for install-kubeadm.

2021-10-26 11:49:51 +08:00
parent 1db9bf46a1
commit 7780084390
1 changed files with 5 additions and 1 deletions
@@ -69,7 +69,11 @@ For more details please see the [Network Plugin Requirements](/docs/concepts/ext
 ## Check required ports
 These
 [required ports](/docs/reference/ports-and-protocols/)
-need to be open in order for Kubernetes components to communicate with each other.
+need to be open in order for Kubernetes components to communicate with each other. You can use `telnet` to check if a port is open. for example:
+
+```shell
+telnet 127.0.0.1 6443
+```

 The pod network plugin you use (see below) may also require certain ports to be
 open. Since this differs with each pod network plugin, please see the