proc_open (): fork failed - Cannot allocate memory
composer require "spatie/laravel-permission:~2.29"时报错交换空间不足问题
解决:建立交换空间
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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