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  • docker--shell和Exec格式

    shell格式

    RUN apt-get install -y vim

    CMD echo "docker so easy"

    ENTRYPOINT echo "docker so easy"

    Exec格式

    RUN ["apt-get","install","-y","vim"]

    CMD ["echo","docker so easy"]

    ENTRYPOINT ["echo","docker so easy"]

    通过两个dockerfile来对比

    
    
    [root@localhost test]# cat dockerfile1/Dockerfile 
    from centos
    ENV name Docker
    ENTRYPOINT echo "$name so easy"
    [root@localhost test]# cat dockerfile2/Dockerfile 
    from centos
    ENV name Docker
    ENTRYPOINT ["/bin/echo","$name so easy"]
    [root@localhost test]# pwd
    /test
    [root@localhost test]# mkdir dockerfile1
    [root@localhost test]# mkdir dockerfile2
    [root@localhost test]# vim dockerfile1/Dockerfile
    [root@localhost test]# cp dockerfile1/Dockerfile dockerfile2/
    [root@localhost test]# vim dockerfile2/Dockerfile 
    [root@localhost test]# cat dockerfile1/Dockerfile 
    from centos
    ENV name Docker
    ENTRYPOINT echo "$name so easy"
    [root@localhost test]# cat dockerfile2/Dockerfile 
    from centos
    ENV name Docker
    ENTRYPOINT ["/bin/echo","$name so easy"]
    [root@localhost test]# docker build -t bigni/centos_shell ./dockerfile1/
    Sending build context to Docker daemon  2.048kB
    Step 1/3 : from centos
     ---> 9f38484d220f
    Step 2/3 : ENV name Docker
     ---> Running in 556fd0d58c0f
    Removing intermediate container 556fd0d58c0f
     ---> 43e2ff86b0c7
    Step 3/3 : ENTRYPOINT echo "$name so easy"
     ---> Running in d50a776a6a3a
    Removing intermediate container d50a776a6a3a
     ---> fc84f5de7f3b
    Successfully built fc84f5de7f3b
    Successfully tagged bigni/centos_shell:latest
    [root@localhost test]# docker build -t bigni/centos_exec ./dockerfile2/
    Sending build context to Docker daemon  2.048kB
    Step 1/3 : from centos
     ---> 9f38484d220f
    Step 2/3 : ENV name Docker
     ---> Using cache
     ---> 43e2ff86b0c7
    Step 3/3 : ENTRYPOINT ["/bin/echo","$name so easy"]
     ---> Running in 4c226e9e7459
    Removing intermediate container 4c226e9e7459
     ---> 350ad6186f0b
    Successfully built 350ad6186f0b
    Successfully tagged bigni/centos_exec:latest
    [root@localhost test]# docker image ls -a
    REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
    bigni/centos_exec    latest              350ad6186f0b        10 seconds ago      202MB
    bigni/centos_shell   latest              fc84f5de7f3b        41 seconds ago      202MB
    <none>               <none>              43e2ff86b0c7        42 seconds ago      202MB
    bigni/centos_vim     latest              f853f2a3f901        2 hours ago         362MB
    <none>               <none>              3ec8199c2855        26 hours ago        861kB
    bigni/test1          latest              f5620b92331c        26 hours ago        861kB
    ubuntu               14.04               2c5e00d77a67        7 weeks ago         188MB
    centos               latest              9f38484d220f        3 months ago        202MB
    hello-world          latest              fce289e99eb9        6 months ago        1.84kB
    [root@localhost test]# docker run bigni/centos_shell
    Docker so easy
    [root@localhost test]# docker run bigni/centos_exec
    $name so easy
    [root@localhost test]# vim dockerfile2/Dockerfile 
    [root@localhost test]# cat dockerfile2/Dockerfile 
    from centos
    ENV name Docker
    ENTRYPOINT ["/bin/bash","-c","/bin/echo $name so easy"]
    [root@localhost test]# docker build -t bigni/centos_exec_new ./dockerfile2/
    Sending build context to Docker daemon  2.048kB
    Step 1/3 : from centos
     ---> 9f38484d220f
    Step 2/3 : ENV name Docker
     ---> Using cache
     ---> 43e2ff86b0c7
    Step 3/3 : ENTRYPOINT ["/bin/bash","-c","/bin/echo $name so easy"]
     ---> Running in c64527904495
    Removing intermediate container c64527904495
     ---> 6713eb2d0b46
    Successfully built 6713eb2d0b46
    Successfully tagged bigni/centos_exec_new:latest
    [root@localhost test]# docker run bigni/centos_exec_new
    Docker so easy
    [root@localhost test]#
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  • 原文地址:https://www.cnblogs.com/laonicc/p/11147129.html
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