docker容器磁盘

docker容器磁盘扩容

一、配置文件里更改容器创建时的默认磁盘大小

[root@ip-10-10-125-7 ~]# cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS="--storage-opt dm.loopdatasize=2000G -storage-opt dm.loopmetadatasize=10G --storage-opt dm.fs=ext4 --storage-opt dm.basesize=20G"

参数：
dm.loopdatasize=2000G是指存放数据的数据库空间为2t，默认是100g
dm.loopmetadatasize=10G是存放Metadata数据空间为10g，默认是2g
dm.fs=ext4是指容器磁盘分区为ext4
dm.basesize=20G是指容器根分区默认为20g，默认是10g

新版本dm字段有了改变：

DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper --storage-opt dm.loopdatasize=2000G --storage-opt dm.loopmetadatasize=10G --storage-opt dm.fs=ext4 --storage-opt dm.basesize=20G"

 二、容器的动态扩容脚本

#!/bin/bash 
#This script is dynamic modify docker container disk 
#Author dong liu 
if [ -z $1 ] || [ -z $2 ]; 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 1                                                                                                                    
fi
if [ `docker inspect $1 &>>/dev/null &&  echo 0 || echo 1` -eq 1 ];then
    echo "The container $1 is no exist!"
    exit 1 
fi
container_id=`docker inspect -f '{{ .Id }}' $1` 
now_disk=`dmsetup table /dev/mapper/docker-*-$container_id|awk '{print $2}'` 
disk=$(($2*1024*1024*1024/512)) 
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 1 
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 0 ];then
    echo "dynamic container $1 disk to ${2}G is success!"
else
    echo "dynamic container $1 disk to ${2}G is fail!"
Fi