The following exception is caused by a lack of memory and not having swap configured

if you got this error when install composer

The following exception is caused by a lack of memory and not having swap configured

you should do this

$ sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024 \\
sudo /sbin/mkswap /var/swap.1 \\
sudo /sbin/swapon /var/swap.1
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