docker commit ：表示提交一个容器的副本使之成为新的镜像。假如我们在docker上运行了一个tomcat的容器，对Tomcat容器进行了修改操作，然后我们将修改操作后的tomcat进行commit，就得到了一个新的镜像。

命令格式：docker commit -m=“提交的描述信息” -a="作者" 容器id 要创建的目标镜像名:[标签名]

案例演示

 1、从hub上下载tomcat镜像到本地并运行成功

说明： -p是指定端口号。-P是随机端口号

[root@t-docker chenzx]# docker images tomcat
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
tomcat              latest              690cb3b9c7d1        7 days ago          463MB
[root@t-docker chenzx]# docker run -it -p 8888:8080 tomcat
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /docker-java-home/jre
30-Aug-2018 08:37:01.728 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
30-Aug-2018 08:37:01.736 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
30-Aug-2018 08:37:01.739 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 555 ms
[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                    NAMES
5c83a1f3aea4        tomcat              "catalina.sh run"   8 minutes ago       Up 8 minutes        0.0.0.0:8888->8080/tcp   quirky_zhukovsky

 

[root@t-docker chenzx]# docker run -it -P tomcat
[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
54a817e3ce05        tomcat              "catalina.sh run"   21 seconds ago      Up 19 seconds       0.0.0.0:32768->8080/tcp   confident_leavitt

 2、故意删除上一步镜像产生的tomcat容器文档

[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
54a817e3ce05        tomcat              "catalina.sh run"   17 minutes ago      Up 17 minutes       0.0.0.0:32768->8080/tcp   confident_leavitt
[root@t-docker chenzx]# docker exec -it 54a817e3ce05 /bin/bash
root@54a817e3ce05:/usr/local/tomcat# cd webapps/
root@54a817e3ce05:/usr/local/tomcat/webapps# ls -l
total 4
drwxr-x---  3 root root  306 Aug 23 00:47 ROOT
drwxr-x--- 14 root root 4096 Aug 23 00:47 docs
drwxr-x---  6 root root   83 Aug 23 00:47 examples
drwxr-x---  5 root root   87 Aug 23 00:47 host-manager
drwxr-x---  5 root root  103 Aug 23 00:47 manager
root@54a817e3ce05:/usr/local/tomcat/webapps# rm -rf docs/
root@54a817e3ce05:/usr/local/tomcat/webapps# ls -l
total 0
drwxr-x--- 3 root root 306 Aug 23 00:47 ROOT
drwxr-x--- 6 root root  83 Aug 23 00:47 examples
drwxr-x--- 5 root root  87 Aug 23 00:47 host-manager
drwxr-x--- 5 root root 103 Aug 23 00:47 manager

 3、通过上一步，当前的tomcat是没有doc目录的容器，以他为模板commit一个没有doc的tomcat新镜像zhenzx/tomcat02，zhenxz就是自己取名的命名空间

[root@t-docker chenzx]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
54a817e3ce05        tomcat              "catalina.sh run"   26 minutes ago      Up 26 minutes       0.0.0.0:32768->8080/tcp   confident_leavitt
[root@t-docker chenzx]# docker commit -a='xiaoxin' -m='del tomcat docs' 54a817e3ce05 chenzx/tomcat02:1.2
sha256:24c3d89d4d043e4fb97f0cf4f3b94bcf96b5600a062fc8de4e39a7763d20badf
[root@t-docker chenzx]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
chenzx/tomcat02     1.2                 24c3d89d4d04        7 seconds ago       463MB
tomcat              latest              690cb3b9c7d1        7 days ago          463MB

 把正在运行的容器全部删除

[root@t-docker chenzx]# docker rm -f $(docker ps -q)
54a817e3ce05
[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

 以我们自定义的镜像生成一个新的容器

[root@t-docker chenzx]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
chenzx/tomcat02     1.2                 24c3d89d4d04        6 minutes ago       463MB
tomcat              latest              690cb3b9c7d1        7 days ago          463MB
centos              latest              5182e96772bf        3 weeks ago         200MB
[root@t-docker chenzx]# 
[root@t-docker chenzx]# docker run -it -P chenzx/tomcat02:1.2 
[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS                     NAMES
c6c68b224e84        chenzx/tomcat02:1.2   "catalina.sh run"   24 seconds ago      Up 24 seconds       0.0.0.0:32770->8080/tcp   awesome_sammet

 连接后可以看到，我们用自定义的tomcat1.2镜像没有doc目录

6、启动我们新的镜像并和原来的镜像对比

启动chenzx/tomcat1.2，它没有doc目录

启动原来的tomcat，它有doc目录

[root@t-docker chenzx]# docker run -d -p 6666:8080 tomcat
23b4ec6f24b854f682631c5a9b6bcfc0c685dbec46d1867faea4b534f5791452
[root@t-docker chenzx]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                    NAMES
23b4ec6f24b8        tomcat              "catalina.sh run"   5 seconds ago       Up 4 seconds        0.0.0.0:6666->8080/tcp   flamboyant_almeida

 

 

 

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