Docker笔记——搭建私有仓
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Docker笔记——搭建私有仓相关的知识,希望对你有一定的参考价值。
Docker Hub当然是首选镜像仓,如果不想对所有人公开只想在局域网或公司内部使用,则有必要搭建私有仓来存储分发镜像。
搭建私有仓当然可以直接运行以下命令来创建个registry容器:
docker run -d -p 5000:5000 --restart=always --name registry registry:2
一条命令已经很简洁了,这里如果只是写这么一句话就实在太没必要了,所以本文介绍如何一步步编译出registry镜像。
registry官方路径:https://hub.docker.com/_/registry/
Docker registry镜像依赖关系是registry:latest -> alpine:3.4 -> scratch:latest
1 alpine镜像
Dockerfile路径:https://github.com/gliderlabs/docker-alpine/blob/8f23fc2e995ab8f7f0f5960c6a1ddd12f57efd0c/versions/library-3.4/Dockerfile
Docker Registry镜像依赖于alpine:3.4镜像,alpine镜像是一个基于Alpine Linux的一个Docker镜像,它拥有完整的包索引,它真的很小,编译出来只有4.803M。
# make sha256:8cbba14eb7fe1eb44e53557028f622d3de6baf5b932e53b4522b7b525f3c42c3 sha256:659b6da402fd38431f58614b4c57fa6c6efec87702702446c8636628f434d246 # docker images REPOSITORY TAG IMAGE ID CREATED SIZE haskell-scratch integer-simple 659b6da402fd 7 seconds ago 3.811 MB haskell-scratch integer-gmp 8cbba14eb7fe 8 seconds ago 4.286 MB
执行成功后即可得到两个镜像,haskell-scratch:integer-simple和haskell-scratch:integer-gmp
为了使用方便,我们给scratch创建个tag,命令如下:
docker tag haskell-scratch:integer-gmp scratch
3.2 从https://codeload.github.com/gliderlabs/docker-alpine/zip/8f23fc2e995ab8f7f0f5960c6a1ddd12f57efd0c下载alpine,解压后进入docker-alpine-8f23fc2e995ab8f7f0f5960c6a1ddd12f57efd0c/versions/library-3.4目录执行build命令编译alpine镜像,命令如下:
docker build -t alpine:3.4 .
3.3 从https://codeload.github.com/docker/distribution-library-image/zip/3b4a84c1f152b60688e99d2efadf305479541482下载registry,解压后进入distribution-library-image-3b4a84c1f152b60688e99d2efadf305479541482目录,执行build命令编译registry镜像,命令如下:
docker build -t registry .
至此就有了自己一步步编译出来的registry镜像,那么创建个容器试试,命令如下:
# docker run -d -p 5000:5000 --restart=always --name registry registry
055d53fe984679128e2ab8404a4eb4087eb0eb1713368b048d030e8d65a8f56d # docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 055d53fe9846 registry "/entrypoint.sh /etc/" 43 minutes ago Up 43 minutes 0.0.0.0:5000->5000/tcp registry
3.4 push镜像至私有仓
首先,想要push镜像至私有仓,镜像名必须满足一定格式,格式为registry_host:port/image_name:tag
我们给hello-world:latest镜像创建个tag,命令如下:
# docker tag hello-world localhost:5000/hello-world # docker images REPOSITORY TAG IMAGE ID CREATED SIZE hello-world latest c54a2cc56cbb 12 weeks ago 1.848 kB
localhost:5000/hello-world latest c54a2cc56cbb 12 weeks ago 1.848 kB
然后docker push就可以将这个镜像提交到私有仓中了,如下:
docker push localhost:5000/hello-world The push refers to a repository [localhost:5000/hello-world] a02596fdd012: Pushed latest: digest: sha256:a18ed77532f6d6781500db650194e0f9396ba5f05f8b50d4046b294ae5f83aa4 size: 524
接下来为了验证我们的私有仓可用,我将本地的hello-world镜像删除后来做验证,过程如下:
[email protected] *** :~# docker rmi localhost:5000/hello-world hello-world Untagged: localhost:5000/hello-world:latest Untagged: localhost:5000/hello-[email protected]:a18ed77532f6d6781500db650194e0f9396ba5f05f8b50d4046b294ae5f83aa4 Untagged: hello-world:latest Untagged: hello-[email protected]:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9 Deleted: sha256:c54a2cc56cbb2f04003c1cd4507e118af7c0d340fe7e2720f70976c4b75237dc Deleted: sha256:a02596fdd012f22b03af6ad7d11fa590c57507558357b079c3e8cebceb4262d7 [email protected] *** :~# docker run localhost:5000/hello-world Unable to find image ‘localhost:5000/hello-world:latest‘ locally latest: Pulling from hello-world c04b14da8d14: Pull complete Digest: sha256:a18ed77532f6d6781500db650194e0f9396ba5f05f8b50d4046b294ae5f83aa4 Status: Downloaded newer image for localhost:5000/hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker Hub account: https://hub.docker.com For more examples and ideas, visit: https://docs.docker.com/engine/userguide/
至此,私有仓搭建成功。
以上是关于Docker笔记——搭建私有仓的主要内容,如果未能解决你的问题,请参考以下文章
企业运维实战--最全Docker学习笔记1.Docker简介安装部署镜像构建Dockerfile详解镜像构建镜像优化本地私有仓库搭建