技术分享 composer update 报错：proc_open(): fork failed - Cannot allocate memory

在 使用 composer update 命令时,出现如下错误：

The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details


  [ErrorException]
  proc_open(): fork failed - Cannot allocate memory

一般小的VPS 才1G内存，如果使用composer会提示内存不足的现象

解决办法，可以使用交换内存

直接命令

/bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
/sbin/mkswap /var/swap.1
/sbin/swapon /var/swap.1
不限制内存使用 php -d memory_limit=-1 composer.phar

• composer update 报错：proc_open(): fork failed - Cannot allocate memory