docker参数--restart=always的作用
发表于:2022-03-10 |
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
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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
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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)

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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。
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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
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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"

              }

       },
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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
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docker info |grep 'Docker Root Dir'
WARNING: No swap limit support
Docker Root Dir: /usr/docker
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