04-docker系列-commit构建自定义镜像

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主旨

本文主要介绍下如何使用commit方式来自定义构建镜像,本文只需浅尝辄止,因为这种centos7方式不是主流构建镜像的方式,所以知道有这种方式即可。

环境

linux环境
ddocker环境

概念

容器里面的操作,当容器被销毁了就没有了
最好不要把数据存放在容器中
我们的实际需求,基础镜像很多无法满足,所以我们需要自定义构建镜像

启动容器

    [yunweijia@localhost ~]$ sudo docker run -it centos:7 /bin/bash

    新增命令ifconfig

    [root@c84f1f4e5c37 /]# yum -y install net-tools
    [root@c84f1f4e5c37 /]# ifconfig
    eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 172.17.0.2 netmask 255.255.0.0 broadcast 172.17.255.255
    ether 02:42:ac:11:00:02 txqueuelen 0 (Ethernet)
    RX packets 8 bytes 648 (64ps://www.fons.com.cn/tag/8-0" target="_blank">8.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    loop txqueuelen 1000 (Local Loopback)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    [root@c84f1f4e5c37 /]#

    新增脚本

    增加一个可持续运行的脚本。,新增的脚centos7网络配置本所处位置,必须在容器中PATH的目录下方可,或者修改下PATH环境变量,不然无法在生成centos7配置ip地址容器的时候指定该脚本,后面配置程序也是如此。

    [root@c84f1f4e5c37 /]# vi /usr/bin/yunweijia
    while true;do echo yunweijia; sleep 5; done
    [root@c84f1f4e5c37 /]# exit # 退出容器

    构建镜像八省联考排名

    语法:docker commit 容器ID 镜像名:版本号
    参数解释:
    镜像名:随意,和原镜像无任何关系
    版本号:随意,和原版本无任何关系
    实例:
    [yunweijia@localhost ~]$ sudo docker commit c84f1f4e5c37 centos:ceshi
    [yunweijia@localhost ~]$ sudo docker images
    REPOSITORY TAG IMAGE ID CREATED SIZE
    centos ceshi adeae577d8b3 13 seconds ago 359MB
    hello-world latest feb5d9fea6a5 4 months ago 13.3kB
    centos 7 eeb6ee3f44bd 4 months ago 204MB
    [yunweijia@localhost ~]$

    用新镜像启动容器

    [yunweijia@localhost ~]$ sudo docker run -d centos:ceshi /bin/bash -c yunweijia
    291ac4a08a8d7f746ec7690e92241bf17c683edb2b5694fb421ba7ba067d9725
    [yunweijia@localhost ~]$
    [yunweijia@localhost ~]$ sudo docker ps
    CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
    291ac4a08a8d centos:ceshi "/bin/bash -c yunwei…" 8 seconds ago Up 7 seconds awesome_wiles

    看下新容器的日志

    [yunweijia@localhost ~]$ sudo docker logs 291ac4a08a8d
    yunweijia
    yunweijia
    yunweijia
    yunweijia
    yunweijia
    yunweijia
    [yunweijia@localhost ~]$ # 说明我们指定的脚本在容器中运行呢

    进入容器中,看下新增的ifconflinux必学的60个命令ig命令是否存在

    [yunweijia@localhost ~]$ sudo docker exec -it 291ac4a08a8d /bin/bash
    [root@291ac4a08a8d /]# ifconfig
    eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 172.17.0.3 netmask 255.255.0.0 broadcast 172.17.255.255
    ether 02:42:ac:11:00:03 txqueuelen 0 (Ethernet)
    RX packets 8 bytes 648 (648.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    loop txqueuelen 1000 (Local Loopback)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    [root@291ac4a08a8d /]#

    至此,用commit构建镜像结束。下一篇:使用dockerfile构建镜像