Memory limit on composer installation - mysql

Question

I have a cloud in the digital ocean where it has 1 GB of ram.
I need to install a docker, laravel, mysql, nginx environment, I found the laradock and installed it normally but when running the composer in the container I am returning a memory limit error.
Error running: composer install
root#b9864446a1e1:/var/www/site# composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
PHP Fatal error: Out of memory (allocated 677388288) (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/RuleWatchGraph.php on line 52
Fatal error: Out of memory (allocated 677388288) (tried to allocate 4096 bytes) in phar:///usr/local/bin/composer/src/Composer/DependencyResolver/RuleWatchGraph.php on line 52
Error when trying to change memory.
WARNING: Your kernel does not support swap limit capabilities or the
cgroup is not mounted. Memory limited without swap.

Answer 1

This could be happening because the VPS runs out of memory and has no Swap space enabled.
free -m
total used free shared buffers cached
Mem: xxxx xxx xxxx x x xxx
-/+ buffers/cache: xxx xxxx
Swap: 0 0 0
To enable the swap you can use for example:
/bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
/sbin/mkswap /var/swap.1
/sbin/swapon /var/swap.1
You can make a permanent swap file following this tutorial from DigitalOcean.