Docker – ENTRYPOINT & CMD commands with mongod results in unknown option error

dockermongodb

I am using multiple Dockerfiles to setup my server infrastructure. One of the Dockerfiles I build is a MongoDB server which will be linked to a running web server application in a later step. Currently, I have the problem when running the MongoDB server I receive following error: 

"Error parsing command line: unknown option port 27017"

In my Dockerfile I have:

CMD ["--port 27017", "--dbpath /data/db", "--smallfiles"]    
ENTRYPOINT ["/usr/bin/mongod"]

When I use instead of the above commands the following everything works:

CMD /usr/bin/mongod --port 27017 --dbpath /data/db --smallfiles

I prefer the CMD – Array and ENTRYPOINT approach more but cannot figure out why I receive the error.

Best Answer

You need to separate out the arguments in the array like:

CMD ["--port", "27017", "--dbpath", "/data/db", "--smallfiles"]    
ENTRYPOINT ["/usr/bin/mongod"]

See this duplicate answer: https://stackoverflow.com/a/24392379/684908

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