限制日志大小，防止docker日志塞满硬盘

cat > /etc/docker/daemon.json <<EOF
{
    "registry-mirrors": [
        "https://代理地址"
    ],
    "insecure-registries": [
        "192.168.188.251:8081"
    ],
    "log-driver": "json-file", //这是限制容器日志大小的配置，输出该配置后请将注释删除，json文件不支持注释
    "log-opts": {
        "max-size": "20m",
        "max-file": "3"
    }
}
EOF