docker参数--restart=always的作用

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创建容器时没有添加参数 --restart=always ，导致的后果是：当 Docker 重启时，容器未能自动启动。

现在要添加该参数怎么办呢，方法有二：

1、Docker 命令修改

docker container update --restart=always 容器名字

操作实例如下：
[root@localhost mnt]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
46cdfc60b7a6 nginx "nginx -g 'daemon ..." About a minute ago Up 42 seconds 80/tcp n3
79d55a734c26 nginx "nginx -g 'daemon ..." About a minute ago Up 42 seconds 80/tcp n2
f7b2206c019d nginx "nginx -g 'daemon ..." About a minute ago Up 46 seconds 80/tcp n1
[root@localhost mnt]# docker container update --restart=always n1
n1
[root@localhost mnt]# systemctl restart docker
[root@localhost mnt]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
46cdfc60b7a6 nginx "nginx -g 'daemon ..." 2 minutes ago Exited (0) 5 seconds ago n3
79d55a734c26 nginx "nginx -g 'daemon ..." 2 minutes ago Exited (0) 5 seconds ago n2
f7b2206c019d nginx "nginx -g 'daemon ..." 2 minutes ago Up 2 seconds 80/tcp n1

2、直接改配置文件（经测试后无效，修改配置文件后，启动容器后，该参数有自动变成了no，修改不生效）

首先停止容器，不然无法修改配置文件
配置文件路径为：/var/lib/docker/containers/容器ID
在该目录下找到一个文件 hostconfig.json ，找到该文件中关键字 RestartPolicy
修改前配置："RestartPolicy":{"Name":"no","MaximumRetryCount":0}
修改后配置："RestartPolicy":{"Name":"always","MaximumRetryCount":0}
最后启动容器。

修改docker容器的挂载路径

停止所有docker容器
sudo docker stop $(docker ps -a | awk '{ print $1}' | tail -n +2)
停止docker服务
sudo service docker stop
修改mysql路径
cd ~
sudo cp -r mysql/ /home/server/

备份容器配置文件
cd /var/lib/docker/containers/de9c6501cdd3
cp hostconfig.json hostconfig.json.bak
cp config.v2.json config.v2.json.bak

修改hostconfig的冒号前的配置路径
vi hostconfig.json"Binds": ["/home/server/mysql/conf/my.cnf:/etc/mysql/my.cnf", "/home/server/mysql/logs:/logs", "/home/server/mysql/data:/mysql_data"],

修改config的Source的配置路径
vi config.v2.json "MountPoints": { "/etc/mysql/my.cnf": { "Source": "/home/server/mysql/conf/my.cnf", "Destination": "/etc/mysql/my.cnf", "RW": true, "Name": "", "Driver": "", "Relabel": "", "Propagation": "rprivate", "Named": false, "ID": "" }, "/logs": { "Source": "/home/server/mysql/logs", "Destination": "/logs", "RW": true, "Name": "", "Driver": "", "Relabel": "", "Propagation": "rprivate", "Named": false, "ID": "" }, "/mysql_data": { "Source": "/home/server/mysql/data", "Destination": "/mysql_data", "RW": true, "Name": "", "Driver": "", "Relabel": "", "Propagation": "rprivate", "Named": false, "ID": "" }, "/var/lib/mysql": { "Source": "", "Destination": "/var/lib/mysql", "RW": true, "Name": "85d91bff7012b57606af819480ce267449084e81ab386737c80ace9fe75f6621", "Driver": "local", "Relabel": "", "Propagation": "", "Named": false, "ID": "897cd0152dd152166cb2715044ca4a3915a1b66280e0eb096eb74c2d737d7f77" } },

启动docker服务
sudo service docker start

启动所有docker容器
sudo docker start $(docker ps -a | awk '{ print $1}' | tail -n +2)

修改docker默认的存储位置

docker 的所有images及相关信息存储位置为：/var/lib/docker

查看默认的docker存储路径
docker info |grep 'Docker Root Dir'
WARNING: No swap limit support
Docker Root Dir: /var/lib/docker

停止所有docker容器
sudo docker stop $(docker ps -a | awk '{ print $1}' | tail -n +2)

停止docker服务
sudo service docker stop
cd /var/lib

打包docker目录
sudo tar -czvf /usr/docker.tar.gz docker/
cd /usr/
sudo tar -xzvf docker.tar.gz

修改docker默认的存储位置
sudo vim /etc/docker/daemon.json{
"graph": "/home/server/docker"
}
启动docker服务
sudo service docker start

启动所有docker容器
sudo docker start $(docker ps -a | awk '{ print $1}' | tail -n +2)

查看修改后docker存储路径
docker info |grep 'Docker Root Dir'
WARNING: No swap limit support
Docker Root Dir: /usr/docker本文转自：https://www.cnblogs.com/zhuochong/p/10070516.html ！！！！！！