Bash script to start Docker containers

Question

This script works:

#!/bin/bash

for i in {1..10}
    do echo “yes $i”
done

But when attempting to start several Docker containers it only starts the first container and exits:

docker_run.sh

#!/bin/bash

for i in {1..10}
    do exec docker run —name docker-nginx$i -P -d nginx
    sleep 3
done

The sleep 3 was added to give it time. Not sure if it matters. Of course the script has to run with sudo permissions.

Solution

To run many docker machines your script should be like this:

#!/bin/bash

for i in {1..10}
    do docker run —name docker-nginx$i -P -d nginx
    sleep 3
done

You should not use exec in this case as exec replaces the current process (your script) with the process resulting from executing its arguments (docker ...). This is why your script never gets past the first iteration.

Comments

[Atul Vekariya]

Why do you use exec command? Try to do it running directly docker