Docker run script in host on docker-compose up

Question

thank you for watching this question.

So my question relates to best practices on how to run a script on a docker-compose up directive.

Currently i\'m sharin

Answer 1

I just wish to know the best practices and examples of how to run a script on HOST from INSIDE a CONTAINER, so that the deploy can be as easy for the installing operator to just run docker-compose up

It seems that there is no best practice that can be applied to your case. A workaround proposed here: How to run shell script on host from docker container? is to use a client/server trick.

1. The host should run a small server (choose a port and specify a request type that you should be waiting for)
2. The container, after it starts, should send this request to that server
3. The host should then run the script / trigger the changes you want

This is something that might have serious security issues, so use at your own risk.

Answer 2

You can create an alias for docker-compose up. Put something like this in ~/.bash_aliases (in Ubuntu):

alias up="docker-compose up; ~/your_script.sh"

I'm not sure if running scripts on the host from a container is possible, but if it's possible, it's a severe security flaw. Containers should be isolated, that's the point of using containers.

Answer 3

The script needs to run continuously in the foreground.

In your Dockerfile use the CMD directive and define the script as the parameter.

When using the cli, use docker run -d IMAGE SCRIPT