I'm looking for the standard way to purge all unused container with a kubernetes on all nodes. Now I'm doing like this.

purge.sh

#!/usr/bin/env bash
# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
#  Author:  Ali Said Omar
#  Created: '01/03/2016'
NODES=


function get_nodes(){
    # --label-columns=NAME does not filter on NAME column
    NODES=`kubectl get nodes --label-columns=NAME --no-headers | awk '{print $1}'`
}

function purge_on_nodes(){
    for NODE in $NODES
    do
        glcoud compute ssh $NODE -A "sudo docker ps -aq | xargs sudo docker rm"
    done
}

get_nodes
purge_on_nodes