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khuedoan-homelab/docs/how-to-guides/add-or-remove-nodes.md
Khue Doan 1405fadf1a refactor(docs): apply the Diátaxis framework 
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commit 257867f196376df55fa0f57edbdf33967b1da04e
Author: Khue Doan <mail@khuedoan.com>
Date:   Sun Sep 18 16:45:42 2022 +0700

    refactor(docs): apply the Diátaxis framework
2022-09-19 02:40:07 +07:00

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Add or remove nodes

Or how to scale vertically. To replace the same node with a clean OS, remove it and add it again.

Add new nodes

!!! tip

You can add multiple nodes at the same time

Add its details to the inventory at the end of the group (masters or workers):

diff --git a/metal/inventories/prod.yml b/metal/inventories/prod.yml
index 7f6474a..1bb2cbc 100644
--- a/metal/inventories/prod.yml
+++ b/metal/inventories/prod.yml
@@ -8,3 +8,4 @@ metal:
     workers:
       hosts:
         metal3: {ansible_host: 192.168.1.113, mac: '00:23:24:d1:f5:69', disk: sda, network_interface: eno1}
+        metal4: {ansible_host: 192.168.1.114, mac: '00:11:22:33:44:55', disk: sda, network_interface: eno1}

Install the OS and join the cluster:

make metal

That's it!

Remove a node

!!! danger

It is recommended to remove nodes one at a time

Remove it from the inventory:

diff --git a/metal/inventories/prod.yml b/metal/inventories/prod.yml
index 7f6474a..d12b50a 100644
--- a/metal/inventories/prod.yml
+++ b/metal/inventories/prod.yml
@@ -4,7 +4,6 @@ metal:
       hosts:
         metal0: {ansible_host: 192.168.1.110, mac: '00:23:24:d1:f3:f0', disk: sda, network_interface: eno1}
         metal1: {ansible_host: 192.168.1.111, mac: '00:23:24:d1:f4:d6', disk: sda, network_interface: eno1}
-        metal2: {ansible_host: 192.168.1.112, mac: '00:23:24:e7:04:60', disk: sda, network_interface: eno1}
     workers:
       hosts:
         metal3: {ansible_host: 192.168.1.113, mac: '00:23:24:d1:f5:69', disk: sda, network_interface: eno1}

Drain the node:

kubectl drain ${NODE_NAME} --delete-emptydir-data --ignore-daemonsets --force

Remove the node from the cluster

kubectl delete node ${NODE_NAME}

Shutdown the node:

ssh root@${NODE_IP} poweroff