#!/bin/bash

#This script is dynamic modify docker container disk

if [ -z $ ] || [ -z $ ]; then

    echo "Usage: container_name increase_capacity"

    echo "Example: I want increase 11G to test"

    echo "The command is:   sh `basename $0` test 11"

    exit

fi

if [ `docker inspect $ &>>/dev/null &&  echo  || echo ` -eq  ];then

    echo "The container $1 is no exist!"

    exit

fi

container_id=`docker inspect -f '{{ .Id }}' $`

now_disk=`dmsetup table /dev/mapper/docker-*-$container_id|awk '{print $2}'`

disk=$(($***/))

if [ $disk -lt $now_disk ];then

    echo "I can't shink container $1 from $(($now_disk*512/1024/1024/1024))G to ${2}G!I only modify contanier increase disk!"

    exit

fi

dmsetup table /dev/mapper/docker-*-$container_id|sed "s/0 [0-9]* thin/0 $disk thin/"|dmsetup load /dev/mapper/docker-*-$container_id

dmsetup resume /dev/mapper/docker-*-$container_id

resize2fs /dev/mapper/docker-*-$container_id

if [ $? -eq  ];then

    echo "dynamic container $1 disk to ${2}G is success!"

else

    echo "dynamic container $1 disk to ${2}G is fail!"

fi