Docker swarm dead workers cleanup

swarm-nodes-cleanup.sh

#!/bin/bash
#
# This script clean a docker swarm cluster from all the dead worker nodes
# 
# docker node ls output example
# ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
#y4000************e1uv5vdj *   boat-manager-c240   Ready               Active              Reachable           19.03.11
#wlqc4************zywu7z90     boat-manager-cb78   Ready               Active              Reachable           19.03.8
#i9fz8************rkmn98yh     boat-manager-e102   Ready               Active              Leader              19.03.8
#wgrj7************rj8sglzg     boat-tank01-9a5b    Down                Active                                  19.03.9
#5thbe************8bt8c7pn     boat-tank01-20df    Ready               Active                                  19.03.9
#xyvyo************rqwvnbpc     boat-worker-0e4a    Down                Active                                  19.03.8

set -e

# exclude managers and get only Down workers nodes
docker node ls | egrep -v '(Leader|Reachable)' | grep Down | while read line; do
  id=$(echo $line | awk '{ print $1 }')
  hostname=$(echo $line | awk '{ print $2 }')
  status=$(echo $line | awk '{ print $3 }')
  availability=$(echo $line | awk '{ print $4 }')

  if [[ $availability == 'Active' && $status == 'Down' ]]; then
    echo "$hostname results Active but is Down, drop it"
    docker node rm $id
  fi
done

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