Docker命令-commit

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命令

docker commit

描述

Create a new image from a container’s changes
根据容器的更改创建新的镜像

用法

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docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

选项

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Options:
  --author , -a   指定作者
  --change , -c   指定修改的Dockerfile参数,支持指令CMD|ENTRYPOINT|ENV|EXPOSE|LABEL|ONBUILD|USER|VOLUME|WORKDIR
  --message , -m  提交备注信息
  --pause , -p    创建镜像时暂停容器,可选参数true或false,默认为true

注意

无

示例

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# 运行一个容器
$ docker run --name nginx -it -d -p 80:80 nginx:1.20.1-alpine
$ docker ps
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                NAMES
a8c31015e674        nginx:1.20.1-alpine   "/docker-entrypoint.…"   3 seconds ago       Up 3 seconds        0.0.0.0:80->80/tcp   nginx
# 进入容器并修改容器中的文件
$ docker exec -it nginx /bin/sh
/ # echo docker > /usr/share/nginx/html/index.html
/ # exit
$ curl localhost
docker
# 将修改后的容器nginx保存为新的镜像demo_nginx:v1
$ docker commit nginx demo_nginx:v1
sha256:5f1ab458849a0d70f4ef6d69983f39ce35c694b5539e32dd88b090a7e68ad198
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
demo_nginx          v1                  5f1ab458849a        4 seconds ago       22.7MB
nginx               1.20.1-alpine       4146b18ae794        6 months ago        22.7MB
# 停止容器nginx,启动新的容器demo_nginx并验证更改的文件内容
$ docker stop nginx
$ docker run --name demo_nginx -it -d -p 80:80 demo_nginx:v1
$ curl localhost
docker

# 查看容器demo_nginx的环境变量,等同于镜像demo_nginx:v1的环境变量
$ docker inspect -f "{{ .Config.Env }}" demo_nginx
[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin NGINX_VERSION=1.20.1 NJS_VERSION=0.5.3 PKG_RELEASE=1]
# 修改容器的环境变量并创建新的镜像demo_nginx:v2
$ docker commit --change "ENV DEBUG=true" demo_nginx demo_nginx:v2
sha256:8ee210f7ce068f100f30b740e9b2049ba18170efdd6abf7e3e64136f35858c3b
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
demo_nginx          v2                  8ee210f7ce06        4 seconds ago       22.7MB
demo_nginx          v1                  5f1ab458849a        5 minutes ago       22.7MB
nginx               1.20.1-alpine       4146b18ae794        6 months ago        22.7MB
# 对比两个镜像的环境变量
$ docker inspect -f "{{ .Config.Env }}" demo_nginx:v1
[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin NGINX_VERSION=1.20.1 NJS_VERSION=0.5.3 PKG_RELEASE=1]
$ docker inspect -f "{{ .Config.Env }}" demo_nginx:v2
[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin NGINX_VERSION=1.20.1 NJS_VERSION=0.5.3 PKG_RELEASE=1 DEBUG=true]