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解决docker容器日志导致主机磁盘空间满了的情况
wintersoft · 2019-11-27 · via 博客园 - wintersoft

日志文件在   /var/lib/docker/containers/<docker_container_id>/   目录下


查看日志大小

vim /opt/docker_log_size.sh

#!/bin/sh

echo "======== docker containers logs file size ========"  

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

for log in $logs  
        do  
             ls -lh $log   
        done  

chmod +x /opt/docker_log_size.sh

/opt/docker_log_size.sh


删除日志

通过上面的脚本找到占用空间大的日志,复制出日志路径
清空日志
cat /dev/null > <docker_container_id>-json.log


清空所有日志的脚本

vim /opt/clean_docker_log.sh

#!/bin/sh 

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 ========"  

chmod +x /opt/clean_docker_log.sh

/opt/clean_docker_log.sh


上述方法,日志文件迟早又会涨回来。
下面从根本上解决问题。


设置Docker容器日志大小

设置一个容器服务的日志大小上限

以nginx为例

nginx: 
  image: nginx:latest
  restart: always 
  logging: 
    driver: "json-file" 
    options: 
      max-size: "5g"

重启nginx容器之后,其日志文件的大小就被限制在5GB


全局设置

新建/etc/docker/daemon.json,若有就不用新建了。添加log-dirver和log-opts参数,样例如下:
vim /etc/docker/daemon.json

{
        "registry-mirrors": ["https://registry.docker-cn.com"],
        "live-restore": true,
        "log-driver":"json-file",
        "log-opts": {"max-size":"500m", "max-file":"1"}
}

max-size=500m,意味着一个容器日志大小上限是500M, 

max-file=3,意味着一个容器有三个日志,分别是id+.json、id+1.json、id+2.json。

// 重启docker守护进程
systemctl daemon-reload
systemctl restart docker

参考:https://my.oschina.net/u/2289161/blog/1931390