Execute two commands with docker exec
docker exec [id] -c 'cd /var/www/project && composer install'
-c is not detected.
I also tried this:
docker exec [id] cd /var/www/project && composer install
But the command
composer install is executed after the
docker exec command.
How can I do it?
3 Solutions collect form web for “Execute two commands with docker exec”
In your first example, you are giving the
-c flag to
docker exec. That’s an easy answer:
docker exec does not have a
In your second example, your shell is parsing this into two commands before Docker even sees it. It is equivalent to this:
if docker exec [id] cd /var/www/project then composer install fi
docker exec is run, and if it exits 0 (success),
composer install will try to run locally, outside of Docker.
What you need to do is pass both commands in as a single argument to
docker exec using a string. Then they will not be interpreted by a shell until already inside the container.
docker exec [id] "cd /var/www/project && composer install"
However, as you noted in the comments, this also does not work. That’s because
cd is a shell builtin, and doesn’t exist on its own. Trying to execute it as the initial command will fail. So the next step is to hand this off to a shell to execute.
docker exec [id] "bash -c 'cd /var/www/project && composer install'"
And finally, at this point the
&& has moved into an inner set of quote marks, so we don’t really need the quotes around the
bash command… you can drop them if you prefer.
docker exec [id] bash -c 'cd /var/www/project && composer install'
Everything after the container id is the command to run, so in the first example
-c isn’t an option to exec, but a command docker tries to run and fails since that command doesn’t exist.
Most likely you found this syntax from a
docker run command where the entrypoint was set to
/bin/sh. However, exec bypasses the entrypoint, so you need to include the full command to run. As others have pointed out, that command includes a shell like bash or in the below example, sh:
docker exec [id] /bin/sh -c 'cd /var/www/project && composer install'
as Nehal J Wani said in his commentary, the correct syntax is the following:
docker exec [id] /bin/bash -c 'cd /var/www/project && composer install'