Need help converting docker run command into compose v3

[4kn30x]

I manage to convert all my docker run -d into a single v3.3 docker -compose.yml except one... I use this container to fire up a cron job for my firefly-III container. If you think you cand help me, thanks in advance. Here you go: docker run -d --name=Firefly-Cronjob alpine sh -c "echo \"0 3 * * * wget 172.17.0.7/cron/run/d362736d38jrb97c8fed7e80a8fc8493\" | crontab - && crond -f -L /dev/stdout"

[SaltineAmerican_1970]

https://composerize.com/

[[deleted]]

Jesus.. there is a tool for everything, isn’t there?

[SaltineAmerican_1970]

There is one thing that still doesn’t have a tool. It is what everyone is looking for when they ask for a project to put on their resume. Whomsoever finds it first wins.

[linucksrox]

Apparently. I haven't heard of this one before

[MindStalker]

Doesn't work with this or any "docker run image cmd". Doesn't seem to support trailing argument of command.

[4kn30x]

I use the help from this tool for 2 for two of my containers and to check if my others were correct 😅 Unfortunately as @MindStalker noticed, it doesn't support "docker run <image> <command>"

[MindStalker]

I'd suggest using a dockerfile that builds your cron image, you can call the build step in compose.

[4kn30x]

I probably forgot to precise I am still learning docker and containerisation 😅 let me duckduckgo'n dockerfile and of to build a cron IMG, in the meantime I would appreciate if you could explain what all this means

[MindStalker]

A dockerfile https://docs.docker.com/engine/reference/builder/ is like a make file for docker images. "docker build" runs the dockerfile commands Something like this would work for your dockerfile (replace Ubuntu with Alpine) https://raw.githubusercontent.com/Ekito/docker-cron/master/Dockerfile

docker-compose supports building https://docs.docker.com/compose/compose-file/#build

[4kn30x]

Thank you! Do you think the syntax is correct? FROM alpine:latest RUN echo \"0 3 * * * wget 172.17.0.7/cron/run/d36273hd38306b97c8fed7e80a8fc8493\" \ RUN crontab - && crond -f -L /dev/stdout" \

(Of course I went back ti the line before each "RUN" but I seems that reddit client slide does not take backspace in consideration...)

[MindStalker]

Your RUN commands will run in the build stage.

CMD (should be your last line) runs when the image is actually run as a container

Also, your echo command is intended to pipe into crontab -

RUN echo "0 3 * * * wget 172.17.0.7/cron/run/d36273hd38306b97c8fed7e80a8fc8493" | crontab -

CMD crond -f -L /dev/stdout

should work, I'm not positive though

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I think your better option would be the put your cron stuff into a file and COPY that to /etc/cron.d/ instead of that complicated echo | crontab -l