Composer - PHP 警告：proc_open()：fork 失败 - 无法分配内存

Question

我对composer有问题，它一直运行良好，但现在不想……
这是一个简单composer install命令的结果：

bob@SRV04:~/testdir$ composer install
Loading composer repositories with package information
Updating dependencies
Package operations: 44 installs, 0 updates, 0 removals
  - Installing psr/container (1.0.0): 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

PHP Warning:  proc_open(): fork failed - Cannot allocate memory in 
phar:///bin/composer/vendor/symfony/console/Application.php on line 952

Warning: proc_open(): fork failed - Cannot allocate memory in 
phar:///bin/composer/vendor/symfony/console/Application.php on line 952

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

问题是，鉴于我的记忆状态，一切都应该有效。

free -h
             total       used       free     shared    buffers     cached
Mem:          7,8G       3,4G       4,4G       131M       207M       503M
-/+ buffers/cache:       2,7G       5,1G
Swap:         1,7G       728M       971M

• 我更新了我能更新的一切
• php.ini 内存设置为-1

我看到还有其他几个问题与此问题类似，但没有一个提出修复该错误的解决方案

Answer 1

COMPOSER_MEMORY_LIMIT=-1 composer update

那个额外的小命令挽救了我在旧服务器上的生命。