kubectl drain using kubernetes api

kube-api-drain.sh

HOSTNAME=`curl -s http://169.254.169.254/latest/meta-data/local-hostname`
SERVER=$1
TOKEN=$2

curl -s --insecure -k -v -H "Accept: application/json" -H "Authorization: Bearer $TOKEN" -XPATCH -d '{"spec":{"unschedulable":true}}' -H "Content-Type: application/merge-patch+json" $SERVER/api/v1/nodes/$HOSTNAME

for each in $(curl -s -k -H "Authorization: Bearer $TOKEN" --insecure -XGET $SERVER/api/v1/namespaces  | jq -r '.items[].metadata.name');
  do arr=($(curl -s -k -H "Authorization: Bearer $TOKEN" --insecure -XGET $SERVER/api/v1/namespaces/$each/pods  | jq --arg node $HOSTNAME -r '.items[] | select(.spec.nodeName == $node) | .metadata.name'));
  for i in  ${arr[@]};
    do curl -s --insecure -k -H "Authorization: Bearer $TOKEN" -XDELETE $SERVER/api/v1/namespaces/$each/pods/$i | grep "nodeName";
  done
done

# Sleep 40 seconds because of default 30 seconds graceful period
sleep 40

This cordons the node and drain its pods
Usage:

$ ./kube-api-drain.sh https://kubernetesapi:8000 service_account_token