docker文件存放路径, 获取容器启动命令操作

容器早已创建好，如何得知它的启动参数（数据挂载到哪）

#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

以上这篇docker文件存放路径, 获取容器启动命令操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。