【磁盘空间不足问题解决】Docker 日志清理

问题描述：

1、系统无法访问，提示“无法访问此网站”

2、启动Docker 镜像提示错误信息，如下：

“Error response from daemon: Cannot restart container 7f812bfba45f: write /var/lib/docker/containers/7f812bfba45fe73859bd40216a94800b6448346e0b5e645a9de63db2ed33435e/hash769099957: no space left on device”

 

问题解决：

1、查看磁盘空间

[root@pltpbqapp5 containers]# sudo du -sh *
[root@pltpbqapp5 containers]# df -TH
[root@pltpbqapp5 containers]# sudo find / -type f -size +100M

2、找到Docker日志
Docker 的日志文件存在 /var/lib/docker/containers 目录中，通过下面的命令可以将日志文件夹根据升序的方式罗列出来。

[root@pltpbqapp5 containers]# du -d1 -h /var/lib/docker/containers | sort -h

输出如下：

[root@pltpbqapp5 containers]# du -d1 -h /var/lib/docker/containers | sort -h
0    /var/lib/docker/containers/73a76ad6fc83d4a9034a7563cb5bd29c0d469453ae41dd119b8b63b09ce51cf3
20K    /var/lib/docker/containers/32f33d28227bb882a696d8d284de3b75d7a0bc940df8e2e67b5e9e02ce704aff
56K    /var/lib/docker/containers/379ccf129c7d03447f63f8599d0ab97d95a5c315f19018f1bf76ab18166090ef
188K    /var/lib/docker/containers/464ac79af2a4ecb201930a662f89a2c6f4ddaf54754a9da9cf341087c74fe7a3
300K    /var/lib/docker/containers/60decf8cd9ac943a08aa505a05a8e918c504d36a368fb7c50f101d3cfc39b266
3.2M    /var/lib/docker/containers/2aa7823d93041339e3ed52dbf94a5bad3dbb2b15512315725b6b04bfc1d965ef
4.5M    /var/lib/docker/containers/a5fdcf8b7c1446a20426de2fdc1884c3f9e62ab3ba4815f9818858d9795522d9
6.9M    /var/lib/docker/containers/f0e340b0ccf8c8e91bd242eeb444e7269986ad07c200cd4a7d012320eb20af00
11M    /var/lib/docker/containers/d2c6155db43a13f8cce6777ac576c76d2cabf93d44ca8a48c9db478eca0ecdab
16M    /var/lib/docker/containers/ffe70a34f252e4f23c2ac91a22694b5568fc77d553d59f96137563d13700f4b2
20M    /var/lib/docker/containers/89673d151c7fe59686719a3a9baf6e3e0f514b4b41e9d8acb5f38d127f5bc392
461M    /var/lib/docker/containers/f0cb3a1ce0881540d998f4e3ab471bf141edf25f4ae0b157edc90a37415bb906
3.1G    /var/lib/docker/containers/361274753a0a967818667c278c447c2091788acc3d03864c20c5920ecb696e3f
8.2G    /var/lib/docker/containers/7f812bfba45fe73859bd40216a94800b6448346e0b5e645a9de63db2ed33435e

 

3、清理日志

由于日志文件比较多，一个个清理比较麻烦，这里直接使用脚本清理

创建文件：

[root@pltpbqapp5 /]# cd /home/testops/
[root@pltpbqapp5 /]# touch clean_docker_logs.sh
[root@pltpbqapp5 /]# vim clean_docker_logs.sh

 

内容如下：

#!/bin/bash
echo "==================== start clean docker containers logs =========================="

logs=$(find /var/lib/docker/containers/ -name *-json.log)

for log in $logs
  do
    echo "clean logs : $log"
    cat /dev/null > $log
  done

echo "==================== end clean docker containers logs   =========================="

脚本赋予执行权限：

[root@pltpbqapp5 testops]# chmod 700 clean_docker_logs.sh

执行脚本：

/home/testops/clean_docker_logs.sh

执行完成：

[root@pltpbqapp5 testops]# /home/testops/clean_docker_logs.sh
==================== start clean docker containers logs ==========================
clean logs : /var/lib/docker/containers/f0e340b0ccf8c8e91bd242eeb444e7269986ad07c200cd4a7d012320eb20af00/f0e340b0ccf8c8e91bd242eeb444e7269986ad07c200cd4a7d012320eb20af00-json.log
clean logs : /var/lib/docker/containers/f0cb3a1ce0881540d998f4e3ab471bf141edf25f4ae0b157edc90a37415bb906/f0cb3a1ce0881540d998f4e3ab471bf141edf25f4ae0b157edc90a37415bb906-json.log
...
==================== end clean docker containers logs   ==========================

 

4、查看清理结果

[root@pltpbqapp5 testops]# du -sh /var/lib/docker/containers
396K /var/lib/docker/containers

 

5、 重启docker 服务，问题解决

[root@pltpbqapp5 /]# docker restart 7f812bfba45f
7f812bfba45f