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Merge pull request #30234 from calvin0327/improvement-install-kubeadm 

Improvement for install-kubeadm
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Kubernetes Prow Robot 2021-10-27 16:07:02 -07:00 committed by GitHub
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content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md
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@ -69,7 +69,11 @@ For more details please see the [Network Plugin Requirements](/docs/concepts/ext
## Check required ports ## Check required ports
These These
[required ports](/docs/reference/ports-and-protocols/) [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 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 open. Since this differs with each pod network plugin, please see the