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This article mainly shows you "Dockerfile in docker how to customize mycentos", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "docker in Dockerfile how to customize mycentos" this article.

Base Mirror (scratch)

99% of the images in Docker Hub are built by installing and configuring the required software in the base image. In other words, the base image is the ancestor of all other mirrors.

What happens when hub defaults to centos image [root@t-docker chenzx] # docker run-it centos [root@ef7873879474 /] # vim a.txt # # default ceonts does not support vim command bash: vim: command not found [root@ef7873879474 /] # ifconfig # # default centos does not support ifconfig command bash: ifconfig: command not found custom image mycentos

1. Write Dokcerfile files

[root@t-docker mycentos] # cat Dockerfile FROM centosMAINTAINER chenzx chenzx@11.comENV MYPATH / usr/localWORKDIR $MYPATHRUN yum-y install vimRUN yum-y install net-toolsEXPOSE 80CMD echo $MYPATHCMD echo "success-ok" CMD / bin/bash

2. Construction

Syntax: docker build-t new image name: TAG.

[root@t-docker mycentos] # docker build-f. / Dockerfile-t mycentos:1.3 .Sending build context to Docker daemon 2.048kBStep 1x10: FROM centos-- > 5182e96772bfStep 2x10: MAINTAINER chenzx chenzx@11.com-> Running in bf692c9a8f30Removing intermediate container bf692c9a8f30-- > be7c6d72dcf6Step 3lash 10: ENV MYPATH / usr/local-- > Running in bfbe973063c4Removing intermediate container bfbe973063c4-- > b6117be61d21Step 4lash 10: WORKDIR $MYPATH-- > Running in dc207977e37eRemoving intermediate container dc207977e37e-> a299de1b142dStep 5lem10: RUN yum-y install vim-- > Running in 7b18a2ea02baLoaded plugins: fastestmirror OvlDetermining fastest mirrors * base: mirror.bit.edu.cn * extras: mirror.bit.edu.cn * updates: mirror.bit.edu.cnResolving Dependencies-- > Running transaction check--- > Package vim-enhanced.x86_64 2 Vol 7.4.160-4.el7 will be installed-- > Processing Dependency: vim-common = 2RV 7.4.160-4.el7 for package: 2:vim-enhanced-7.4.160-4.el7.x86 * 64MB-> Processing Dependency: which for package: 2 : vim-enhanced-7.4.160-4.el7.x86q64murf-> Processing Dependency: perl (: MODULE_COMPAT_5.16.3) for package: 2:vim-enhanced-7.4.160-4.el7.x86afluto-> Processing Dependency: libperl.so () (64bit) for package: 2:vim-enhanced-7.4.160-4.el7.x86afluto-> 41b54eafc062Step 6max 10: RUN yum-y install net-tools-- > Running in 4fe95a3f928dLoaded plugins: fastestmirror OvlLoading mirror speeds from cached hostfile * base: mirror.bit.edu.cn * extras: mirror.bit.edu.cn * updates: mirror.bit.edu.cnResolving Dependencies-- > Running transaction checkStep 7 MYPATH 10: EXPOSE 80-> Running in b49331f041a0Removing intermediate container b49331f041a0-- > 255ce503616bStep 8 MYPATH 10: CMD echo $MYPATH-> Running in 0c8a45aa210fRemoving intermediate container 0c8a45aa210f-> b70d750b50c6Step 9 MYPATH 10: CMD echo "success-ok"-> Running in 0f82aaeab3afRemoving intermediate container 0f82aaeab3af-> 41680031171eStep 10 : CMD / bin/bash-- > Running in 5694bd9a1dabRemoving intermediate container 5694bd9a1dab-- > 0c868c56748bSuccessfully built 0c868c56748bSuccessfully tagged mycentos:1.3 [root@t-docker mycentos] # [root@t-docker mycentos] # docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEmycentos 1.3 0c868c56748b 5 minutes ago 442MB

3. Run

[root@t-docker mycentos] # docker run-it mycentos:1.3 [root@28ab180a72d7 local] # pwd # # the foothold is / usr/local/usr/local [root@28ab180a72d7 local] # vim a.txt # # vim command also has [root@28ab180a72d7 local] # ifconfig # # ifconfig command eth0: flags=4163 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 0 bytes 0 (0.0B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 0 bytes 0 (0.0B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@28ab180a72d7 local] #

4. List the change history of the image

Function: from the bottom up, you can see the historical process of making mycentos images.

[root@t-docker mycentos] # docker images mycentosREPOSITORY TAG IMAGE ID CREATED SIZEmycentos 1.3 0c868c56748b 12 minutes ago 442MB [root@t-docker mycentos] # docker history 0c868c56748bIMAGE CREATED CREATED BY SIZE COMMENT0c868c56748b 12 minutes ago / bin/sh-c # (nop) CMD ["/ bin/sh"- c"/ bin... 0B 41680031171e 12 minutes ago / bin/sh-c # (nop) CMD ["/ bin/sh"-c "" echo … " 0B b70d750b50c6 12 minutes ago / bin/sh-c # (nop) CMD ["/ bin/sh"-c "" echo... 0B 255ce503616b 12 minutes ago / bin/sh-c # (nop) EXPOSE 800B 1cb7e8747969 12 minutes ago / bin/sh-c yum-y install net-tools 93.7MB 41b54eafc062 12 minutes ago / bin/sh-c yum-y install vim 149MB A299de1b142d 13 minutes ago / bin/sh-c # (nop) WORKDIR / usr/local 0B b6117be61d21 13 minutes ago / bin/sh-c # (nop) ENV MYPATH=/usr/local 0B be7c6d72dcf6 13 minutes ago / bin/sh-c # (nop) MAINTAINER chenzx chenzx@ … 0B 5182e96772bf 3 weeks ago / bin/sh-c # (nop) CMD ["/ bin/bash"] 0B 3 weeks ago / bin/sh-c # (nop) LABEL org.label-schema.sc … 0B 3 weeks ago / bin/sh-c # (nop) ADD file:6340c690b08865d7e … 200MB above is all the content of this article "how to customize mycentos in Dockerfile in docker". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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