CODEWITHSUNDEEP
bashkubernetes
Camil
Camil

Reputation: 8456

Kubernetes - delete all the pods from the node before reboot or shutdown using kubenetes API

I need a bash script to delete only pods on specific node before shutdown or reboot using Kubernetes API.

Upvotes: 1

Views: 1773

Answers (2)

Timo Reimann
Timo Reimann

Reputation: 9837

If your goal is to remove all pods from a particular node and stop new pods from being scheduled on that node, then kubectl drain is what you probably want: It stops sending pods to the node and kills any existing ones.

It's as simple as invoking

kubectl drain NODE

and comes with a few extra switches to tweak the behavior (such as defining a graceful termination period).

Upvotes: 1

Camil
Camil

Reputation: 8456

Found a solution that works for what I'm trying to achieve:

for each in $(curl -XGET https://URL/api/v1/namespaces  | jq -r '.items[].metadata.name'); 
  do arr=($(curl -XGET https://URL/api/v1/namespaces/$each/pods  | jq --arg node `hostname` -r '.items[] | select(.spec.nodeName == $node) | .metadata.name')); 
  for i in  ${arr[@]}; 
    do curl -XDELETE https://URL/api/v1/namespaces/$each/pods/$i ;
  done 
done

This is a script present on each Worker node and it's executed before each reboot or shutdown and deletes all the pods from all namespaces that are present on that node only. Before this, there is another command that marks the node as "unschedulable". If anyone is interested in this, I can post the complete solution

Upvotes: 2

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