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 nodes details to the inventory at the end of the group (kube_control_plane or kube_node):

diff --git a/metal/inventories/master/inventory.ini b/metal/inventories/master/inventory.ini
index fe0ca8b..ddbca8d 100644
--- a/metal/inventories/master/inventory.ini
+++ b/metal/inventories/master/inventory.ini
@@ -18,6 +18,7 @@ odroid-hc4
 k8s-odroid-hc4-1
 k8s-odroid-hc4-2
 k8s-odroid-hc4-3
+k8s-odroid-hc4-4

 [amd64]
 k8s-amd64-1

Setup OS and network: manual Setup

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/master/inventory.ini b/metal/inventories/master/inventory.ini
index fe0ca8b..19891bf 100644
--- a/metal/inventories/master/inventory.ini
+++ b/metal/inventories/master/inventory.ini
@@ -17,7 +17,6 @@ odroid-hc4
 [odroid-hc4]
 k8s-odroid-hc4-1
 k8s-odroid-hc4-2
-k8s-odroid-hc4-3

 [amd64]
 k8s-amd64-1

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