利用DockerHub和Github自动构建镜像

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本地写好一份 Dockerfile，然后上传到 Github。DockerHub 会根据上传的 Dockerfile 自动构建镜像

我写好一份 Dockerfile，然后上传到 Github 的仓库，目录结构是这样

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├─ README.md
│
└─ aliyun_ubuntu/
    ├─  Dockerfile
    └─ sources.list

然后在 DockerHub 新建一个 Repository，取名为 ikutarian/aliyun_ubuntu，并创建构建脚本

根据 Github 仓库的目录结构，Dockerfile 在 aliyun_ubuntu 文件夹里， 所以 Build Context 要写成 /aliyun_ubuntu/。至于 Dockerfile location 的值，按照文档的说法

Path from the repository root to the files to build. The Dockerfile location is relative to this path

也就是说 Dockerfile location 是相对 Build Context 路径来查找的。如果你的 Dockerfile 文件名没有改的话，默认就写 Dockerfile

填写完毕之后就开始构建

可以查看构建的 Log，比如我的

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Building in Docker Cloud's infrastructure...
Cloning into '.'...
Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts.
Reset branch 'master'
Your branch is up-to-date with 'origin/master'.
KernelVersion: 4.4.0-1060-aws
Components: [{u'Version': u'18.03.1-ee-3', u'Name': u'Engine', u'Details': {u'KernelVersion': u'4.4.0-1060-aws', u'Os': u'linux', u'BuildTime': u'2018-08-30T18:42:30.000000000+00:00', u'ApiVersion': u'1.37', u'MinAPIVersion': u'1.12', u'GitCommit': u'b9a5c95', u'Arch': u'amd64', u'Experimental': u'false', u'GoVersion': u'go1.10.2'}}]
Arch: amd64
BuildTime: 2018-08-30T18:42:30.000000000+00:00
ApiVersion: 1.37
Platform: {u'Name': u''}
Version: 18.03.1-ee-3
MinAPIVersion: 1.12
GitCommit: b9a5c95
Os: linux
GoVersion: go1.10.2
Starting build of index.docker.io/ikutarian/aliyun_ubuntu:latest...
Step 1/4 : FROM ubuntu:16.04
---> 7e87e2b3bf7a
Step 2/4 : RUN mv /etc/apt/sources.list /etc/apt/sources.list.bak
---> Running in b2aa14f7a9c4
Removing intermediate container b2aa14f7a9c4
---> f11911c81be9
Step 3/4 : COPY sources.list /etc/apt/sources.list
---> 7b450ef519d8
Step 4/4 : RUN apt-get update
---> Running in da9e1409463f
Get:1 http://mirrors.aliyun.com/ubuntu xenial InRelease [247 kB]
Get:2 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease [109 kB]
Get:3 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease [107 kB]
Get:4 http://mirrors.aliyun.com/ubuntu xenial-security InRelease [109 kB]
Get:5 http://mirrors.aliyun.com/ubuntu xenial/main amd64 Packages [1558 kB]
Get:6 http://mirrors.aliyun.com/ubuntu xenial/restricted amd64 Packages [14.1 kB]
Get:7 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 Packages [9827 kB]
Get:8 http://mirrors.aliyun.com/ubuntu xenial/multiverse amd64 Packages [176 kB]
Get:9 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 Packages [1180 kB]
Get:10 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted amd64 Packages [13.1 kB]
Get:11 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 Packages [944 kB]
Get:12 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse amd64 Packages [19.1 kB]
Get:13 http://mirrors.aliyun.com/ubuntu xenial-backports/main amd64 Packages [7942 B]
Get:14 http://mirrors.aliyun.com/ubuntu xenial-backports/universe amd64 Packages [8532 B]
Get:15 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages [786 kB]
Get:16 http://mirrors.aliyun.com/ubuntu xenial-security/restricted amd64 Packages [12.7 kB]
Get:17 http://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 Packages [541 kB]
Get:18 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse amd64 Packages [6116 B]
Fetched 15.7 MB in 9s (1732 kB/s)
Reading package lists...
Removing intermediate container da9e1409463f
---> b6493b2ebb97
Successfully built b6493b2ebb97
Successfully tagged ikutarian/aliyun_ubuntu:latest
Pushing index.docker.io/ikutarian/aliyun_ubuntu:latest...
Done!
Build finished

可以看到构建已经成功了