阿里云部署Docker(9)----Dockerfile脚本定制镜像

这里。我给大家贴原文会比較好。

An ENTRYPOINT helps you to configure a container that you can run as an executable. That is, when you specify an ENTRYPOINT, then the whole container runs as if it was just that executable.


Unlike the behavior of the CMD instruction, The ENTRYPOINT instruction adds an entry command that will not be overwritten when arguments are passed to docker run. This allows arguments to be passed to the entry point, i.e. docker run <image> -d will pass the -d argument to the entry point.


You can specify parameters either in the ENTRYPOINT JSON array (as in "like an exec" above), or by using a CMD instruction. Parameters in the ENTRYPOINT instruction will not be overridden by the docker run arguments, but parameters specified via a CMD instruction will be overridden by docker run arguments.


Like a CMD, you can specify a plain string for the ENTRYPOINT and it will execute in /bin/sh -c:


FROM ubuntu
ENTRYPOINT ls -l
For example, that Dockerfile‘s image will always take a directory as an input and return a directory listing. If you wanted to make this optional but default, you could use a CMD instruction:


FROM ubuntu
CMD ["-l"]
ENTRYPOINT ["ls"]

WORKDIR 工作文件夹

RUN ENTERPOINT带的指令在哪里运行的设置。

此外，另一些指令，比如

USER 。ONBUILD。等就不想说了。

最后给出一个演示样例

[java] view plaincopy

1. # Nginx  
2. #  
3. # VERSION               0.0.1  
4.   
5. FROM      ubuntu  
6. MAINTAINER Victor Vieux <victor@docker.com>  
7.   
8. RUN apt-get update && apt-get install -y inotify-tools nginx apache2 openssh-server  
9.   
10. # Firefox over VNC  
11. #  
12. # VERSION               0.3  
13.   
14. FROM ubuntu  
15.   
16. # Install vnc, xvfb in order to create a ‘fake‘ display and firefox  
17. RUN apt-get update && apt-get install -y x11vnc xvfb firefox  
18. RUN mkdir /.vnc  
19. # Setup a password  
20. RUN x11vnc -storepasswd 1234 ~/.vnc/passwd  
21. # Autostart firefox (might not be the best way, but it does the trick)  
22. RUN bash -c ‘echo "firefox" >> /.bashrc‘  
23.   
24. EXPOSE 5900  
25. CMD    ["x11vnc", "-forever", "-usepw", "-create"]  
26.   
27. # Multiple images example  
28. #  
29. # VERSION               0.1  
30.   
31. FROM ubuntu  
32. RUN echo foo > bar  
33. # Will output something like ===> 907ad6c2736f  
34.   
35. FROM ubuntu  
36. RUN echo moo > oink  
37. # Will output something like ===> 695d7793cbe4  
38.   
39. # You?ll now have two images, 907ad6c2736f with /bar, and 695d7793cbe4 with  
40. # /oink.