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Update install-kubeadm.md

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Telnet is a command that really should not be used, as there is too great a chance it could be misused. NetCat, nc, is a better and newer tool for testing single open ports.
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serewicz
2022-03-24 09:58:58 -05:00
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@@ -69,10 +69,10 @@ 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. You can use telnet to check if a port is open. For example: need to be open in order for Kubernetes components to communicate with each other. You can use NetCat to check if a port is open. For example:
```shell ```shell
telnet 127.0.0.1 6443 nc 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