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[英]Understanding the difference in sequence of ENTRYPOINT/CMD between Dockerfile and docker run
[英]Docker run command ignoring part of Dockerfile CMD when ENTRYPOINT present
當我運行我的docker容器時,它似乎只是尊重CMD數組的第一個元素(python可執行文件)並忽略尾隨參數。
Dockerfile:
FROM ubuntu:14.04
ENTRYPOINT ["/bin/bash", "-c"]
CMD ["/virtualenv/bin/python", "/mycode/myscript.py", "--param1"]
運行命令:
$ docker run --rm -it --volume $(pwd)/..:/mycode --volume mycontainer-virtualenv:/virtualenv mycontainer
輸出:
Python 3.4.3 (default, Oct 14 2015, 20:28:29)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
如果我跑同樣的情況--detach
而不是-it
。
如果我使用CMD作為重寫的docker run參數運行,也會發生同樣的情況:
$ docker run --rm -it --volume $(pwd)/..:/mycode --volume mycontainer-virtualenv:/virtualenv mycontainer /virtualenv/bin/python /mycode/myscript.py --param1
Python 3.4.3 (default, Oct 14 2015, 20:28:29)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
如果我用bash運行容器並從bash提示符運行CMD,它可以正常工作:
$ docker run --rm -it --volume $(pwd)/..:/mycode --volume mycontainer-virtualenv:/virtualenv mycontainer bash
root@d6a990e81c22:/# /virtualenv/bin/python /mycode/myscript.py --param1
Hello world!
你可能想要
CMD ["/virtualenv/bin/python /mycode/myscript.py --param1"]
代替
CMD ["/virtualenv/bin/python", "/mycode/myscript.py", "--param1"]
當ENTRYPOINT
中存在CMD
和ENTRYPOINT
,CMD作為ENTRYPOINT的默認參數。 所以你基本上做了
bash -c "/virtualenv/bin/python" "/mycode/myscript.py" "--param1"
當你想要的時候
bash -c "/virtualenv/bin/python /mycode/myscript.py --param1"
https://docs.docker.com/engine/reference/builder/#cmd https://docs.docker.com/engine/reference/builder/#entrypoint https://docs.docker.com/engine/reference/建設者/#明白,怎么-CMD-和入口點,相互作用
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