Ansible / Automation / DevOps / Kubernetes
Kubespray is a combination of Ansible and Kubernetes and you can use Kubespray for deploying production ready Kubernetes clusters.
Read how to deploy a Kubernetes cluster using Kubespray.
(Photo byย Aneta Foubรญkovรกย fromย Pexels)
You can manage full-lifecycle of Kubernetes clusters using Kubespray and in this demo we will see how to remove nodes from existing Kubernetes clusters.
Read how to add new nodes in Kubespray managed Kubernetes Cluster
Also read Adding new nodes in Kubespray Managed Kubernetes Cluster
For the demo, we have a running kubernetes cluster with 1x master node and 3x worker nodes.
gini@greenmango kubespray % kubectl get nodes
NAME STATUS ROLES AGE VERSION
master-1 Ready master 4h9m v1.19.3
node-1 Ready <none> 4h8m v1.19.3
node-2 Ready <none> 4h8m v1.19.3
node-3 Ready <none> 82s v1.19.3
We will skip this task as we do not have any workload running on the nodes right now. Also, the remove-node.yml
will try to drain and evacuate the nodes we pass to playbook.
Note: If you are running workloads on your cluster, you need to evacuate the nodes which you want to remove before this action. You can see the steps for how to evacuate or drain kubernetes cluster nodes in this article.
remove-node.yml
We will remove node-2
and node-3 for this demo.
gini@greenmango kubespray % ansible-playbook \
-i inventory/mycluster/hosts.yaml -u devops -b \
remove-node.yml -e "node=node-2,node-3"
Playbook will validate the hosts.yml
and cluster details. Playbook will ask for confirmation as well.
.
.
TASK [Set up proxy environment] *************************************************************************
ok: [master-1]
ok: [node-1]
ok: [node-2]
ok: [node-3]
Are you sure you want to delete nodes state? Type 'yes' to delete nodes. [no]: yes
.
.
If the node you want to remove is not online, you should add reset_nodes=false
to your extra-vars
; -e node=NODE_NAME
-e reset_nodes=false
. Use this flag even when you remove other types of nodes like a master or etcd
nodes.
Wait for playbook to be completed.
Also Read : 10 Tips for CKA & CKAD Exams
Let us see if the nodes the added to Kubernetes cluster.
gini@greenmango kubespray % kubectl get nodes
NAME STATUS ROLES AGE VERSION
master-1 Ready master 4h36m v1.19.3
node-1 Ready <none> 4h35m v1.19.3
Once you confirm the nodes are removed from cluster, then remove all entries of those nodes from your inventory as well โ inventory/mycluster/hosts.yaml
.
Learn how to deploy a Kubernetes Cluster using Kubespray.
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Gineesh Madapparambath
Gineesh Madapparambath is the founder of techbeatly and he is the co-author of The Kubernetes Bible, Second Edition. and the author of ๐๐ป๐๐ถ๐ฏ๐น๐ฒ ๐ณ๐ผ๐ฟ ๐ฅ๐ฒ๐ฎ๐น-๐๐ถ๐ณ๐ฒ ๐๐๐๐ผ๐บ๐ฎ๐๐ถ๐ผ๐ป.
He has worked as a Systems Engineer, Automation Specialist, and content author. His primary focus is on Ansible Automation, Containerisation (OpenShift & Kubernetes), and Infrastructure as Code (Terraform).
(aka Gini Gangadharan - iamgini.com)
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