如何提交docker镜像到DockerHub

Write a Dockerfile

In detail:

FROM（指定基础image）
构建指令，必须指定且需要在Dockerfile其他指令的前面。后续的指令都依赖于该指令指定的image。FROM指令指定的基础image可以是官方远程仓库中的，也可以位于本地仓库。
```
FROM <image>
FROM <image>:<tag>  
```
MAINTAINER（用来指定镜像创建者信息）构建指令，用于将image的制作者相关的信息写入到image中。当我们对该image执行docker inspect命令时，输出中有相应的字段记录该信息。
```
  MAINTAINER <name>  
```
RUN（安装软件用）构建指令，RUN可以运行任何被基础image支持的命令。如基础image选择了ubuntu，那么软件管理部分只能使用ubuntu的命令。
```
RUN <command> (the command is run in a shell - `/bin/sh -c`)  
RUN ["executable", "param1", "param2" ... ]  (exec form)  
```
CMD（设置container启动时执行的操作）设置指令，用于container启动时指定的操作。该操作可以是执行自定义脚本，也可以是执行系统命令。该指令只能在文件中存在一次，如果有多个，则只执行最后一条。
```
 CMD ["executable","param1","param2"] (like an exec, this is the preferred form)  
CMD command param1 param2 (as a shell)  
```
ENTRYPOINT（设置container启动时执行的操作）设置指令，指定容器启动时执行的命令，可以多次设置，但是只有最后一个有效。
```
 ENTRYPOINT ["executable", "param1", "param2"] (like an exec, the preferred form)  
ENTRYPOINT command param1 param2 (as a shell)  
```
USER（设置container容器的用户）设置指令，设置启动容器的用户，默认是root用户。

EXPOSE（指定容器需要映射到宿主机器的端口）

 EXPOSE <port> [<port>...]
# 映射多个端口  
EXPOSE port1 port2 port3

ENV（用于设置环境变量）

 ENV <key> <value>
ENV JAVA_HOME /path/to/java/dirent

ADD（从src复制文件到container的dest路径）
```
 ADD <src> <dest>  
```

For example, create a dockerfile in /home/pyt/test/:

FROM ubuntu:14.04.4
MAINTAINER  puyangsky "puyangsky@163.com"
RUN apt-get update
RUN apt-get install -y nginx
RUN echo "hi , i am in your container" > /usr/share/nginx/html/index.html
expose 80

Build the image:

# docker build -t="puyangsky/test:v0.1" /home/pyt/test/

the result is like:

we see all images:

# docker images

Run the image

the second one is that we just created. And we run it up.

# docker run -d -p 80:80 --name test puyangsky/test:v0.1 nginx -g "daemon off;"
4f6306d2ff200ce37cd3c1ddffee97d29725aeb1871122051ca9a96e0ee852a0

we open the browser and type "localhost:80" and we get:

Push the image to Dockerhub

root@pyt:/home/pyt/test# docker push puyangsky/test:v0.1
The push refers to a repository [puyangsky/test] (len: 1)
229fc9eec22a: Image already exists 
737e1830ecac: Image successfully pushed 
12094b42ed11: Image successfully pushed 
2ff6c8fffe7e: Image successfully pushed 
874509123f48: Image successfully pushed 
87d8afb341b5: Image successfully pushed 
46e772baf32a: Image successfully pushed 
0a7a3b768106: Image successfully pushed 
e094bcb9d0fe: Image successfully pushed 
a16f6804bd85: Image successfully pushed 
Digest: sha256:174cec58394568c6af9a8a98c822a352f535811b2c30171e0e2e217bd60436be

And the image is uploaded to hub.docker.com, https://hub.docker.com/r/puyangsky/test/

Automated from github

Created a github repo: https://github.com/puyangsky/nginx_demo, and create from dockerhub.

So the image is automated by the github repo at https://hub.docker.com/r/puyangsky/nginx_demo/