在docker文件中怎么获取容器的启动命令？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
容器早已创建好，如何得知它的启动参数
#假设通过如下命令启动了一个容器 docker run -d --name mysql\ -p 3306:3306\ -e MYSQL_ROOT_PASSWORD=123456\ --restart=always\ mysql:5.5 --character-set-server=utf8 #如何通过容器名得知启动参数 [root@jenkins ~]# docker inspect mysql_cdh [ { "Id": "fbc3fba81b57bc5b5871746098b5f1f7ef0ed7716a786584a5effbb88ba156e6", "Created": "2019-09-25T01:43:37.720505875Z", "Path": "docker-entrypoint.sh", "Args": [ "--character-set-server=utf8" ], "HostConfig": { "Binds": [ "mysql-data:/var/lib/mysql" ], "ContainerIDFile": "", "LogConfig": { "Type": "json-file", "Config": {} }, "NetworkMode": "default", "PortBindings": { "3306/tcp": [{ "HostIp": "", "HostPort": "3306"} ] }, "RestartPolicy": { "Name": "always", "MaximumRetryCount": 0 }, "Mounts": [ { "Type": "volume", "Name": "mysql-data", "Source": "/var/lib/docker/volumes/mysql-data/_data", "Destination": "/var/lib/mysql", "Driver": "local", "Mode": "z", "RW": true, "Propagation": "" } ],
1, 镜像层：文件存放路径
[root@master ~]# docker image inspect nginx |tail -n 22
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/bf20cf788cc053f00ff1467525d50e19bd1cf07a2167f72511bdfcb28918a472/diff:/var/lib/docker/overlay2/317d80bb7ae58ed288be9ebd84aeb5b4b3a1c06f3211f5d1f32d89b629d1876e/diff",
"MergedDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/merged",
"UpperDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/diff",
"WorkDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/work"
},
"Name": "overlay2"
},2, 容器层：文件存放路径
#1, 启动容器
[root@master ~]# docker run -d --name nginx2 nginx
a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8
#2, 获取容器id
[root@master ~]# docker inspect nginx2 | grep -i id
[root@master ~]# docker inspect nginx2 | grep -i id
"Id": "a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8",
"Pid": 2069,
"ExecIDs": null,
"ContainerIDFile": "",
#查看容器临时文件--每次创建时随机生成的文件(容器层)
[root@master ~]# docker inspect nginx2 | grep -i path
"Path": "nginx",
"ResolvConfPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/hostname",
"HostsPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/hosts",
"LogPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8-json.log",
#通过容器id, 查找容器数据存放目录： /var/lib/docker/overlay2/容器id
######
#对比上面的“镜像层：文件存放路径”，可以看到 :容器通过LowerDir 挂载的方式，映射了镜像层的文件
######
[root@master ~]# docker inspect nginx2 | grep -i dir
"LowerDir": "/var/lib/docker/overlay2/d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b-init/diff:/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/diff:/var/lib/docker/overlay2/bf20cf788cc053f00ff1467525d50e19bd1cf07a2167f72511bdfcb28918a472/diff:/var/lib/docker/overlay2/317d80bb7ae58ed288be9ebd84aeb5b4b3a1c06f3211f5d1f32d89b629d1876e/diff",
"MergedDir": "/var/lib/docker/overlay2/d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b/merged",
"UpperDir": "/var/lib/docker/overlay2/d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b/diff",
"WorkDir": "/var/lib/docker/overlay2/d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b/work"后天修改容器端口
通过容器层文件，找到配置文件hostconfig.json，修改容器映射的端口
[root@docker d93185e3a0....2e544ccfa]# pwd
/var/lib/docker/containers/d93185e3a0....2e544ccfa
[root@docker d93185e3a0....2e544ccfa]# cat hostconfig.json
{"Binds":["/dockersuperset:/home/superset"],"ContainerIDFile":"",
"LogConfig":{"Type":"json-file","Config":{}},"NetworkMode":"default",
"PortBindings":{"8088/tcp":[{"HostIp":"","HostPort":"8099"}]}......3, 进入镜容器文件存储目录， 修改配置文件
# 进入镜容器文件存储目录， 修改配置文件 [root@master ~]# cd /var/lib/docker/overlay2/d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# ls diff link lower merged work [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# ls diff/run/ nginx.pid [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# ls diff/var/cache/nginx/ client_temp fastcgi_temp proxy_temp scgi_temp uwsgi_temp [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# ls merged/ bin/ dev/ etc/ lib/ media/ opt/ root/ sbin/ sys/ usr/ boot/ .dockerenv home/ lib64/ mnt/ proc/ run/ srv/ tmp/ var/ [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# ls merged/etc/nginx/ conf.d fastcgi_params koi-utf koi-win mime.types modules nginx.conf scgi_params uwsgi_params win-utf [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# head merged/etc/nginx/nginx.conf user nginx; worker_processes 1; #在此处修改配置文件，把user nginx; worker_process 1; 这两行的分号去掉，看容器里面的配置是否更改 [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# head merged/etc/nginx/nginx.conf -n 3 user nginx worker_processes 1 #登陆容器，查看修改的配置： 验证是否生效 [root@master d37ff828e63081be6fcfefc73891e7b455596cb921c8021fbf9571f330c0599b]# docker exec -it nginx2 bash root@a9c9f31cdccf:/# head /etc/nginx/nginx.conf -n 3 user nginx worker_processes 1
4, 修改默认存储路径
a, 重建/var/lib/docker目录 #备份数据到新的存放路径 service docker stop mkdir /docker.bak mv /var/lib/docker/* /docker.bak #创建软连接 mkdir /home/docker-data mv /docker.bak/* /home/docker-data/ && rmdir /docker.bak ln -s /home/docker-data /var/lib/docker b, 修改配置 vi /usr/lib/systemd/system/docker.service ExecStart=/usr/bin/dockerd --graph /new-path/docker #reload配置文件 systemctl daemon-reload #重启docker systemctl restart docker.service
补充知识：Docker 指定数据储存目录
Docker 指定储存目录(原参数 --graph 已经失效 。)
方法一
一、在 Docker 配置文件中配置 /etc/docker/daemon.json
下面的命令是在 daemon.json 文件没有内容的时候进行添加的。如果有内容，就需要
cat << EOF >>/etc/docker/daemon.json
{
"data-root": "/mnt/docker-data"
}
EOF
systemctl restart docker方法二
二、在启动参数中配置
vim /usr/lib/systemd/system/docker.service
在里面的EXECStart的后面增加后如下:
ExecStart=/usr/bin/dockerd --data-root='/home/docker' systemctl daemon-reload systemctl restart docker
关于在docker文件中怎么获取容器的启动命令问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注亿速云行业资讯频道了解更多相关知识。
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