From ad2921225b661359a4d83d2beb8aff09486ea383 Mon Sep 17 00:00:00 2001 From: serewicz Date: Thu, 24 Mar 2022 09:58:58 -0500 Subject: [PATCH] Update install-kubeadm.md 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. --- .../production-environment/tools/kubeadm/install-kubeadm.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md b/content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md index dc3ad5d7a6..d3db020b99 100644 --- a/content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md +++ b/content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md @@ -69,10 +69,10 @@ 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. 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 -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