Docker从零开始学习之Commit提交命令
作者：DBA圈小圈
docker commit命令是用于根据docker容器的改变创建一个新的docker镜像,下面这篇文章主要给大家介绍了关于Docker从零开始学习之Commit提交命令的相关资料,文中通过代码介绍的非常详细,需要的朋友可以参考下
前言
了解commit命令之前我们先了解下涉及的相关知识
为什么这里又说镜像，因为之前了解的只是个大概，现在涉及镜像的原理
基本概念
镜像
- 是一种轻量级、可执行的独立软件包，它包含运行某个软件所需的所有内容，我们把应用程序和配置依赖打包好形成一个可交付的运行环境(包括代码、运行时需要的库、环境变量和配置文件等)，这个打包好的运行环境就是image镜像文件。
- 只有通过这个镜像文件才能生成Docker容器实例(类似Java中new出来一个对象)。
镜像分层
什么是镜像分层
- “镜像是有分层的”
- 如图所示：
- 如图所示：
- 镜像的使用的文件技术是UnionFS
- UnionFS（联合文件系统）
- UnionFS（联合文件系统）：Union文件系统（UnionFS）是一种分层、轻量级并且高性能的文件系统，它支持对文件系统的修改作为一次提交来一层层的叠加，同时可以将不同目录挂载到同一个虚拟文件系统下(unite several directories into a single virtual filesystem)。Union 文件系统是 Docker 镜像的基础。镜像可以通过分层来进行继承，基于基础镜像（没有父镜像），可以制作各种具体的应用镜像。
- 特性：一次同时加载多个文件系统，但从外面看起来，只能看到一个文件系统，联合加载会把各层文件系统叠加起来，这样最终的文件系统会包含所有底层的文件和目录
- UnionFS（联合文件系统）
- Docker镜像加载原理：
- Docker的镜像实际上由一层一层的文件系统组成，这种层级的文件系统UnionFS。
- Bootfs(boot file system)主要包含bootloader和kernel, bootloader主要是引导加载kernel, Linux刚启动时会加载bootfs文件系统，在Docker镜像的最底层是引导文件系统bootfs。这一层与我们典型的Linux/Unix系统是一样的，包含boot加载器和内核。当boot加载完成之后整个内核就都在内存中了，此时内存的使用权已由bootfs转交给内核，此时系统也会卸载Bootfs。
- rootfs (root file system) ，在bootfs之上。包含的就是典型 Linux 系统中的 /dev, /proc, /bin, /etc 等标准目录和文件。rootfs就是各种不同的操作系统发行版，比如Ubuntu，Centos等等。
对于一个精简的OS，rootfs可以很小，只需要包括最基本的命令、工具和程序库就可以了，因为底层直接用Host的kernel，自己只需要提供 rootfs 就行了。由此可见对于不同的linux发行版, bootfs基本是一致的, rootfs会有差别, 因此不同的发行版可以公用bootfs。
为什么 Docker 镜像要采用这种分层结构
- 比如说有多个镜像都从相同的 base 镜像构建而来，那么 Docker Host 只需在磁盘上保存一份 base 镜像；
同时内存中也只需加载一份 base 镜像，就可以为所有容器服务了。而且镜像的每一层都可以被共享。
本章要点
- Docker镜像层都是只读的，容器层是可写的。
- 当容器启动时，一个新的可写层被加载到镜像的顶部。这一层通常被称作“容器层”，“容器层”之下的都叫“镜像层”。
- 所有对容器的改动 - 无论添加、删除、还是修改文件都只会发生在容器层中。只有容器层是可写的，容器层下面的所有镜像层都是只读的。
commit 命令
- docker commit 命令用于根据 Docker容器 的更改创建一个新的 Dokcer镜像。该命令后面的 CONTAINER 可以是容器Id，或者是容器名。
命令格式
docker commit -m="[提交的描述信息]" -a="[作者]" [容器ID] [新的镜像名称]:[新的镜像标签]
docker commit 操作参数
| 参数 | 描述 |
|---|---|
| -a, --author string | 作者。 |
| -c, --change list | 应用 dockerfile 指令来创建图像。 |
| -m, --message | string |
| -p, --pause | 提交期间暂停容器（默认为true）。 |
实例演示
1.下载一个新的ubuntu镜像
[root@docker ~]# docker search ubuntu NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating sys… 16622 [OK] websphere-liberty WebSphere Liberty multi-architecture images … 297 [OK] open-liberty Open Liberty multi-architecture images based… 62 [OK] neurodebian NeuroDebian provides neuroscience research s… 105 [OK] ubuntu-debootstrap DEPRECATED; use "ubuntu" instead 52 [OK] ubuntu-upstart DEPRECATED, as is Upstart (find other proces… 115 [OK] ubuntu/nginx Nginx, a high-performance reverse proxy & we… 102 ubuntu/squid Squid is a caching proxy for the Web. Long-t… 70 ubuntu/cortex Cortex provides storage for Prometheus. Long… 4 ubuntu/apache2 Apache, a secure & extensible open-source HT… 65 ubuntu/prometheus Prometheus is a systems and service monitori… 51 ubuntu/kafka Apache Kafka, a distributed event streaming … 37 ubuntu/bind9 BIND 9 is a very flexible, full-featured DNS… 64 ubuntu/mysql MySQL open source fast, stable, multi-thread… 54 ubuntu/zookeeper ZooKeeper maintains configuration informatio… 12 ubuntu/postgres PostgreSQL is an open source object-relation… 31 ubuntu/redis Redis, an open source key-value store. Long-… 21 ubuntu/jre Distroless Java runtime based on Ubuntu. Lon… 9 ubuntu/grafana Grafana, a feature rich metrics dashboard & … 9 ubuntu/dotnet-aspnet Chiselled Ubuntu runtime image for ASP.NET a… 13 ubuntu/memcached Memcached, in-memory keyvalue store for smal… 5 ubuntu/dotnet-deps Chiselled Ubuntu for self-contained .NET & A… 11 ubuntu/prometheus-alertmanager Alertmanager handles client alerts from Prom… 9 ubuntu/dotnet-runtime Chiselled Ubuntu runtime image for .NET apps… 13 ubuntu/cassandra Cassandra, an open source NoSQL distributed … 2 [root@docker ~]# docker pull ubuntu Using default tag: latest latest: Pulling from library/ubuntu 7b1a6ab2e44d: Pull complete Digest: sha256:626ffe58f6e7566e00254b638eb7e0f3b11d4da9675088f4781a50ae288f3322 Status: Downloaded newer image for ubuntu:latest docker.io/library/ubuntu:latest [root@docker ~]#
2.运行容器
[root@docker ~]# docker run -it ba6acccedd29 /bin/bash root@792de8cbe835:/#
3.查看并安装vim
[root@docker ~]# docker run -it ba6acccedd29 /bin/bash root@ce128f008eea:/# vim aaa.txt oot@ce128f008eea:/# apt-get update Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB] Get:2 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB] Get:3 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [3221 kB] Get:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB] Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB] Get:6 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [1275 kB] Get:7 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [177 kB] Get:8 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [33.4 kB] Get:9 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [1129 kB] Get:10 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [11.3 MB] Get:11 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [29.3 kB] Get:12 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [3057 kB] Get:13 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1433 kB] Get:14 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [3206 kB] Get:15 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [3709 kB] Get:16 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [32.0 kB] Get:17 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [55.2 kB] Get:18 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [28.6 kB] Fetched 29.3 MB in 7s (4367 kB/s) Reading package lists... Done root@ce128f008eea:/# apt-get install -y vim Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: alsa-topology-conf alsa-ucm-conf file libasound2 libasound2-data libcanberra0 libexpat1 libgpm2 libltdl7 libmagic-mgc libmagic1 libmpdec2 libogg0 libpython3.8 libpython3.8-minimal libpython3.8-stdlib libreadline8 libsqlite3-0 libssl1.1 libtdb1 libvorbis0a libvorbisfile3 mime-support readline-common sound-theme-freedesktop vim-common vim-runtime xxd xz-utils Suggested packages: libasound2-plugins alsa-utils libcanberra-gtk0 libcanberra-pulse gpm readline-doc ctags vim-doc vim-scripts The following NEW packages will be installed: alsa-topology-conf alsa-ucm-conf file libasound2 libasound2-data libcanberra0 libexpat1 libgpm2 libltdl7 libmagic-mgc libmagic1 libmpdec2 libogg0 libpython3.8 libpython3.8-minimal libpython3.8-stdlib libreadline8 libsqlite3-0 libssl1.1 libtdb1 libvorbis0a libvorbisfile3 mime-support readline-common sound-theme-freedesktop vim vim-common vim-runtime xxd xz-utils 0 upgraded, 30 newly installed, 0 to remove and 51 not upgraded. Need to get 15.0 MB of archives. After this operation, 70.6 MB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu focal/main amd64 libmagic-mgc amd64 1:5.38-4 [218 kB] Get:2 http://archive.ubuntu.com/ubuntu focal/main amd64 libmagic1 amd64 1:5.38-4 [75.9 kB] Get:3 http://archive.ubuntu.com/ubuntu focal/main amd64 file amd64 1:5.38-4 [23.3 kB] Get:4 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libexpat1 amd64 2.2.9-1ubuntu0.6 [74.6 kB] Get:5 http://archive.ubuntu.com/ubuntu focal/main amd64 libmpdec2 amd64 2.4.2-3 [81.1 kB] Get:6 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libssl1.1 amd64 1.1.1f-1ubuntu2.20 [1321 kB] Get:7 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8-minimal amd64 3.8.10-0ubuntu1~20.04.8 [717 kB] Get:8 http://archive.ubuntu.com/ubuntu focal/main amd64 mime-support all 3.64ubuntu1 [30.6 kB] Get:9 http://archive.ubuntu.com/ubuntu focal/main amd64 readline-common all 8.0-4 [53.5 kB] Get:10 http://archive.ubuntu.com/ubuntu focal/main amd64 libreadline8 amd64 8.0-4 [131 kB] Get:11 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libsqlite3-0 amd64 3.31.1-4ubuntu0.5 [549 kB] Get:12 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8-stdlib amd64 3.8.10-0ubuntu1~20.04.8 [1675 kB] Get:13 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 xxd amd64 2:8.1.2269-1ubuntu5.20 [52.6 kB] Get:14 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 vim-common all 2:8.1.2269-1ubuntu5.20 [87.6 kB] Get:15 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 xz-utils amd64 5.2.4-1ubuntu1.1 [82.6 kB] Get:16 http://archive.ubuntu.com/ubuntu focal/main amd64 alsa-topology-conf all 1.2.2-1 [7364 B] Get:17 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 alsa-ucm-conf all 1.2.2-1ubuntu0.13 [27.0 kB] Get:18 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libasound2-data all 1.2.2-2.1ubuntu2.5 [20.1 kB] Get:19 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libasound2 amd64 1.2.2-2.1ubuntu2.5 [335 kB] Get:20 http://archive.ubuntu.com/ubuntu focal/main amd64 libltdl7 amd64 2.4.6-14 [38.5 kB] Get:21 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libtdb1 amd64 1.4.5-0ubuntu0.20.04.1 [44.2 kB] Get:22 http://archive.ubuntu.com/ubuntu focal/main amd64 libogg0 amd64 1.3.4-0ubuntu1 [24.0 kB] Get:23 http://archive.ubuntu.com/ubuntu focal/main amd64 libvorbis0a amd64 1.3.6-2ubuntu1 [87.0 kB] Get:24 http://archive.ubuntu.com/ubuntu focal/main amd64 libvorbisfile3 amd64 1.3.6-2ubuntu1 [16.1 kB] Get:25 http://archive.ubuntu.com/ubuntu focal/main amd64 sound-theme-freedesktop all 0.8-2ubuntu1 [384 kB] Get:26 http://archive.ubuntu.com/ubuntu focal/main amd64 libcanberra0 amd64 0.30-7ubuntu1 [38.1 kB] Get:27 http://archive.ubuntu.com/ubuntu focal/main amd64 libgpm2 amd64 1.20.7-5 [15.1 kB] Get:28 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8 amd64 3.8.10-0ubuntu1~20.04.8 [1625 kB] Get:29 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 vim-runtime all 2:8.1.2269-1ubuntu5.20 [5878 kB] Get:30 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 vim amd64 2:8.1.2269-1ubuntu5.20 [1242 kB] Fetched 15.0 MB in 5s (2983 kB/s) debconf: delaying package configuration, since apt-utils is not installed Selecting previously unselected package libmagic-mgc. (Reading database ... 4127 files and directories currently installed.) Preparing to unpack .../00-libmagic-mgc_1%3a5.38-4_amd64.deb ... Unpacking libmagic-mgc (1:5.38-4) ... Selecting previously unselected package libmagic1:amd64. Preparing to unpack .../01-libmagic1_1%3a5.38-4_amd64.deb ... Unpacking libmagic1:amd64 (1:5.38-4) ... Selecting previously unselected package file. Preparing to unpack .../02-file_1%3a5.38-4_amd64.deb ... Unpacking file (1:5.38-4) ... Selecting previously unselected package libexpat1:amd64. Preparing to unpack .../03-libexpat1_2.2.9-1ubuntu0.6_amd64.deb ... Unpacking libexpat1:amd64 (2.2.9-1ubuntu0.6) ... Selecting previously unselected package libmpdec2:amd64. Preparing to unpack .../04-libmpdec2_2.4.2-3_amd64.deb ... Unpacking libmpdec2:amd64 (2.4.2-3) ... Selecting previously unselected package libssl1.1:amd64. Preparing to unpack .../05-libssl1.1_1.1.1f-1ubuntu2.20_amd64.deb ... Unpacking libssl1.1:amd64 (1.1.1f-1ubuntu2.20) ... 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Selecting previously unselected package vim-runtime. Preparing to unpack .../28-vim-runtime_2%3a8.1.2269-1ubuntu5.20_all.deb ... Adding 'diversion of /usr/share/vim/vim81/doc/help.txt to /usr/share/vim/vim81/doc/help.txt.vim-tiny by vim-runtime' Adding 'diversion of /usr/share/vim/vim81/doc/tags to /usr/share/vim/vim81/doc/tags.vim-tiny by vim-runtime' Unpacking vim-runtime (2:8.1.2269-1ubuntu5.20) ... Selecting previously unselected package vim. Preparing to unpack .../29-vim_2%3a8.1.2269-1ubuntu5.20_amd64.deb ... Unpacking vim (2:8.1.2269-1ubuntu5.20) ... Setting up libexpat1:amd64 (2.2.9-1ubuntu0.6) ... Setting up libgpm2:amd64 (1.20.7-5) ... Setting up libogg0:amd64 (1.3.4-0ubuntu1) ... Setting up mime-support (3.64ubuntu1) ... Setting up alsa-ucm-conf (1.2.2-1ubuntu0.13) ... Setting up libmagic-mgc (1:5.38-4) ... Setting up libtdb1:amd64 (1.4.5-0ubuntu0.20.04.1) ... Setting up libssl1.1:amd64 (1.1.1f-1ubuntu2.20) ... debconf: unable to initialize frontend: Dialog debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 /usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype Setting up libsqlite3-0:amd64 (3.31.1-4ubuntu0.5) ... Setting up libmagic1:amd64 (1:5.38-4) ... Setting up file (1:5.38-4) ... Setting up xxd (2:8.1.2269-1ubuntu5.20) ... Setting up libasound2-data (1.2.2-2.1ubuntu2.5) ... Setting up vim-common (2:8.1.2269-1ubuntu5.20) ... Setting up xz-utils (5.2.4-1ubuntu1.1) ... update-alternatives: using /usr/bin/xz to provide /usr/bin/lzma (lzma) in auto mode update-alternatives: warning: skip creation of /usr/share/man/man1/lzma.1.gz because associated file /usr/share/man/man1/xz.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/unlzma.1.gz because associated file /usr/share/man/man1/unxz.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzcat.1.gz because associated file /usr/share/man/man1/xzcat.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzmore.1.gz because associated file /usr/share/man/man1/xzmore.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzless.1.gz because associated file /usr/share/man/man1/xzless.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzdiff.1.gz because associated file /usr/share/man/man1/xzdiff.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzcmp.1.gz because associated file /usr/share/man/man1/xzcmp.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzgrep.1.gz because associated file /usr/share/man/man1/xzgrep.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzegrep.1.gz because associated file /usr/share/man/man1/xzegrep.1.gz (of link group lzma) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/lzfgrep.1.gz because associated file /usr/share/man/man1/xzfgrep.1.gz (of link group lzma) doesn't exist Setting up libvorbis0a:amd64 (1.3.6-2ubuntu1) ... Setting up libltdl7:amd64 (2.4.6-14) ... Setting up alsa-topology-conf (1.2.2-1) ... Setting up sound-theme-freedesktop (0.8-2ubuntu1) ... Setting up libasound2:amd64 (1.2.2-2.1ubuntu2.5) ... Setting up libmpdec2:amd64 (2.4.2-3) ... Setting up vim-runtime (2:8.1.2269-1ubuntu5.20) ... Setting up readline-common (8.0-4) ... Setting up libpython3.8-minimal:amd64 (3.8.10-0ubuntu1~20.04.8) ... Setting up libreadline8:amd64 (8.0-4) ... Setting up libvorbisfile3:amd64 (1.3.6-2ubuntu1) ... Setting up libpython3.8-stdlib:amd64 (3.8.10-0ubuntu1~20.04.8) ... Setting up libcanberra0:amd64 (0.30-7ubuntu1) ... Setting up libpython3.8:amd64 (3.8.10-0ubuntu1~20.04.8) ... Setting up vim (2:8.1.2269-1ubuntu5.20) ... update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/vim (vim) in auto mode update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/vimdiff (vimdiff) in auto mode update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/rvim (rvim) in auto mode update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/rview (rview) in auto mode update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/vi (vi) in auto mode update-alternatives: warning: skip creation of /usr/share/man/da/man1/vi.1.gz because associated file /usr/share/man/da/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/de/man1/vi.1.gz because associated file /usr/share/man/de/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/fr/man1/vi.1.gz because associated file /usr/share/man/fr/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/it/man1/vi.1.gz because associated file /usr/share/man/it/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ja/man1/vi.1.gz because associated file /usr/share/man/ja/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/pl/man1/vi.1.gz because associated file /usr/share/man/pl/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ru/man1/vi.1.gz because associated file /usr/share/man/ru/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/vi.1.gz because associated file /usr/share/man/man1/vim.1.gz (of link group vi) doesn't exist update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/view (view) in auto mode update-alternatives: warning: skip creation of /usr/share/man/da/man1/view.1.gz because associated file /usr/share/man/da/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/de/man1/view.1.gz because associated file /usr/share/man/de/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/fr/man1/view.1.gz because associated file /usr/share/man/fr/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/it/man1/view.1.gz because associated file /usr/share/man/it/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ja/man1/view.1.gz because associated file /usr/share/man/ja/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/pl/man1/view.1.gz because associated file /usr/share/man/pl/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ru/man1/view.1.gz because associated file /usr/share/man/ru/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/view.1.gz because associated file /usr/share/man/man1/vim.1.gz (of link group view) doesn't exist update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/ex (ex) in auto mode update-alternatives: warning: skip creation of /usr/share/man/da/man1/ex.1.gz because associated file /usr/share/man/da/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/de/man1/ex.1.gz because associated file /usr/share/man/de/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/fr/man1/ex.1.gz because associated file /usr/share/man/fr/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/it/man1/ex.1.gz because associated file /usr/share/man/it/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ja/man1/ex.1.gz because associated file /usr/share/man/ja/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/pl/man1/ex.1.gz because associated file /usr/share/man/pl/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ru/man1/ex.1.gz because associated file /usr/share/man/ru/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/ex.1.gz because associated file /usr/share/man/man1/vim.1.gz (of link group ex) doesn't exist update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/editor (editor) in auto mode update-alternatives: warning: skip creation of /usr/share/man/da/man1/editor.1.gz because associated file /usr/share/man/da/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/de/man1/editor.1.gz because associated file /usr/share/man/de/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/fr/man1/editor.1.gz because associated file /usr/share/man/fr/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/it/man1/editor.1.gz because associated file /usr/share/man/it/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ja/man1/editor.1.gz because associated file /usr/share/man/ja/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/pl/man1/editor.1.gz because associated file /usr/share/man/pl/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/ru/man1/editor.1.gz because associated file /usr/share/man/ru/man1/vim.1.gz (of link group editor) doesn't exist update-alternatives: warning: skip creation of /usr/share/man/man1/editor.1.gz because associated file /usr/share/man/man1/vim.1.gz (of link group editor) doesn't exist Processing triggers for libc-bin (2.31-0ubuntu9.2) ... root@ce128f008eea:/#
4.退出容器
root@ce128f008eea:/# exit exit [root@docker ~]#
5提交自己的镜像
[root@docker ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES dd90b084d152 ubuntu:latest "/bin/bash" About a minute ago Up About a minute ubuntu_vim ccb457c15659 mysql:5.6 "docker-entrypoint.s…" 49 minutes ago Exited (1) 49 minutes ago relaxed_bartik f919fcfcb7b0 hello-world "/hello" 19 hours ago Exited (0) 19 hours ago fervent_benz a4016a83fc04 hello-world "/hello" 23 hours ago Exited (0) 23 hours ago hopeful_bardeen f30bd054e899 9c7a54a9a43c "/hello" 40 hours ago Exited (0) 40 hours ago mystifying_shockley [root@docker ~]# docker commit -m="installed vim" -a="circle" dd90b084d152 cirlce/ubuntu:1.0 sha256:4eac314fbf24dffd018c0682a47044f4108f5fef02d8af5d6a79e91c8bfa0765 [root@docker ~]#
对比
[root@docker ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE 'cirlce/ubuntu' 1.0 4eac314fbf24 2 minutes ago 72.8MB mysql 5.6 dd3b2a5dcb48 23 months ago 303MB 'ubuntu' latest ba6acccedd29 2 years ago 72.8MB hello-world latest feb5d9fea6a5 2 years ago 13.3kB [root@docker ~]#
总结
- Docker中的镜像分层，支持通过扩展现有镜像，创建新的镜像。类似Java继承于一个Base基础类，自己再按需扩展。
- 新镜像是从 base 镜像一层一层叠加生成的。每安装一个软件，就在现有镜像的基础上增加一层
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