how to create docker entrypoint with parameters

Question

I met a really headache for this issue and almost pull my hair up and still can not resolve it. I want docker image to start automatically whenever I start it, so I came to using entrypoint, but always failed.

This is command I usually use to start my app:

cd /opt/path ./start.sh -l dev -ssl false -srv api

I now want to run this command automatically when docker get started.

I used this in docker file:

WORKDIR /opt/ngcsc
ENTRYPOINT ["start.sh","-l","kubstaging","-ssl", "false", "-srv", "api"]

I got this error:

docker: Error response from daemon: oci runtime error: exec: "start.sh": executable file not found in $PATH.

But if I change to absolute path:

ENTRYPOINT ["/opt/ngcsc/start.sh","-l","kubstaging","-ssl", "false", "-srv", "api"]

after I run docker run image

I got:

standard_init_linux.go:175: exec user process caused "exec format error"

This is really a big problem and I googled a lot, nothing worked. can you help to tell me what to do?

Thanks

yes, for sure. if I do not use entryPoint, I can execute it inside with no problem — user3006967
– user3006967, Commented Oct 13, 2016 at 0:08

BMitch · Accepted Answer · 2016-10-13 01:52:53Z

4

Unix is looking for an executable binary to exec, not a shell script. To run the shell script, call it with the appropriate shell, e.g.:

ENTRYPOINT ["/bin/sh", "-c", "/opt/ngcsc/start.sh","-l","kubstaging","-ssl", "false", "-srv", "api"]

Note that this won't make docker automatically start your container when the host reboots. For that, you want the --restart flag on docker run, e.g.:

docker run --restart=unless-stopped -itd your_image

answered Oct 13, 2016 at 1:52

BMitch

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Comments

John Paul Ada · Accepted Answer · 2016-10-13 02:18:33Z

1

How about entering your command into a file and run that file with CMD? For example:

# start.sh
cd /opt/path ./start.sh -l dev -ssl false -srv api

# Dockerfile
# ... other commands
COPY start.sh /usr/local/bin/start/sh
CMD start.sh

start.sh should be in the same path as the Dockerfile and should be executable.

answered Oct 13, 2016 at 2:18

John Paul Ada

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