EC2のmicro instanceでcomposer updateを行った場合、メモリ不足で壮大にコケる場合がある。 PHP Fatal error: Uncaught exception 'ErrorException' with message 'proc_open(): fork failed - Cannot allocate memory' in phar://path/to/composer.phar/vendor/symfony/console/Symfony/Component/Console/Application.php:983
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