If you eve run composer install
and terminal hands and then shows killed
it means the server does not have enough memory to install the packages, this is common if you do not have a composer.lock file in the repository.
IF you do not have a composer.lock
file in your respositoy then should:
ensure compoer.lock
is not in a .gitignore
file Run composer install
in a local environment (either your local physical machine, or a development virtual machine)
With the updated composer.lock
file commit the file and push it to your repository.
Then on the server git pull
and then you should be able to do a composer install
using the same versions as you've done locally.