运维问题.Docker.完美解决docker的/var/lib/docker/持续增长的问题?

事故前提

1.线上Docker宿主机突然无法连接,SSH登录一直显示尝试登录,后台VNC也无法操作,无奈重启

问题原因

1./var/lib/docker/devicemapper/devicemapper/data之前未做重定向,导致data文件持续增长,根分区被撑爆

排查思路

1.df -h查看/分区占用率,du -m --max-depth=1|sort -gr查出data已将近20G

解决办法

1.关闭docker服务service docker stop

2.创建/xm_docker_volume/docker_run_data

3.移动/var/lib/docker/*目录到/xm_docker_volume/docker_run_data/

4.绑定/var/lib/docker到/xm_docker_volume/docker_run_data目录下

#
# /etc/fstab
# Created by anaconda on Wed Sep 16 15:46:52 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/vda1 /                         ext4                 defaults        0 0
/dev/vdc2 /xm_docker_volume         ext4                 defaults        0 0
/xm_docker_volume/docker_run_data   /var/lib/docker none bind            0 0

5.重新mount -a然后重启docker服务service docker restart