在LEMP / ASW下的ubunutu 16上安装Laravel 5.7应用程序时出现错误：
$ composer install
Cannot create cache directory /home/ubuntu/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache
Cannot create cache directory /home/ubuntu/.composer/cache/files/, or directory is not writable. Proceeding without cache
Loading composer repositories with package information
Updating dependencies (including require-dev)
PHP Fatal error: Uncaught ErrorException: proc_open(): fork failed - Cannot allocate memory in /usr/share/php/Symfony/Component/Console/Application.php:943
Stack trace:
#0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', '/usr/share/php/...', 943, Array)
#1 /usr/share/php/Symfony/Component/Console/Application.php(943): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
#2 /usr/share/php/Symfony/Component/Console/Application.php(751): Symfony\Component\Console\Application->getSttyColumns()
#3 /usr/share/php/Symfony/Component/Console/Application.php(712): Symfony\Component\Console\Application->getTerminalDimensions()
#4 /usr/share/php/Symfony/Component/Console/Application.php(645): Symfony\Component\Console\Application->getTerminalWidth()
#5 /usr/share/php/Symfony/Component/Console/Application.php(127): Symfony\Component\Console\Application->renderException(Object(RuntimeException), Object(Symfony\Component\Console\Output\StreamOutput))
#6 /usr/share/php/Composer/Console/Application. in /usr/share/php/Symfony/Component/Console/Application.php on line 943
Fatal error: Uncaught ErrorException: proc_open(): fork failed - Cannot allocate memory in /usr/share/php/Symfony/Component/Console/Application.php:943
Stack trace:
#0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', '/usr/share/php/...', 943, Array)
#1 /usr/share/php/Symfony/Component/Console/Application.php(943): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
#2 /usr/share/php/Symfony/Component/Console/Application.php(751): Symfony\Component\Console\Application->getSttyColumns()
#3 /usr/share/php/Symfony/Component/Console/Application.php(712): Symfony\Component\Console\Application->getTerminalDimensions()
#4 /usr/share/php/Symfony/Component/Console/Application.php(645): Symfony\Component\Console\Application->getTerminalWidth()
#5 /usr/share/php/Symfony/Component/Console/Application.php(127): Symfony\Component\Console\Application->renderException(Object(RuntimeException), Object(Symfony\Component\Console\Output\StreamOutput))
#6 /usr/share/php/Composer/Console/Application. in /usr/share/php/Symfony/Component/Console/Application.php on line 943
我想这是内存不足错误
phpinfo告诉我：
memory_limit 2056M 2056M
$ uname -a
Linux serge 4.15.0-51-generic #55-Ubuntu SMP Wed May 15 14:27:21 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
$ free
total used free shared buff/cache available
Mem: 1014384 224744 454504 13848 335136 611300
Swap: 1048572 0 1048572
$ whoami
ubuntu
我认为此内存必须足以容纳我的应用程序，但是为什么会出错？ 我要注意哪些参数？
已修改： 我在/etc/php/7.2/fpm/php.ini和文件/etc/php/7.2/cli/php.ini文件中都检查了参数：
memory_limit = 2056M
max_execution_time = 3300
max_input_time = 240
upload_max_filesize = 200M
post_max_size = 200M
output_buffering = on
short_open_tag = On
修改后的＃2： 我仍然在寻找决定。我试图安装其他项目，该项目的已安装软件包数量较少（实际上是laravel / vuejs应用程序）， 但是我遇到了同样的错误：
# composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
- Installing symfony/polyfill-ctype (v1.11.0)
Downloading: 100%
The following exception is caused by a lack of memory and not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details
PHP Fatal error: Uncaught ErrorException: proc_open(): fork failed - Cannot allocate memory in /usr/share/php/Symfony/Component/Console/Application.php:943
Stack trace:
#0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', '/usr/share/php/...', 943, Array)
#1 /usr/share/php/Symfony/Component/Console/Application.php(943): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
#2 /usr/share/php/Symfony/Component/Console/Application.php(751): Symfony\Component\Console\Application->getSttyColumns()
#3 /usr/share/php/Symfony/Component/Console/Application.php(712): Symfony\Component\Console\Application->getTerminalDimensions()
#4 /usr/share/php/Symfony/Component/Console/Application.php(645): Symfony\Component\Console\Application->getTerminalWidth()
#5 /usr/share/php/Symfony/Component/Console/Application.php(127): Symfony\Component\Console\Application->renderException(Object(ErrorException), Object(Symfony\Component\Console\Output\StreamOutput))
#6 /usr/share/php/Composer/Console/Application.ph in /usr/share/php/Symfony/Component/Console/Application.php on line 943
Fatal error: Uncaught ErrorException: proc_open(): fork failed - Cannot allocate memory in /usr/share/php/Symfony/Component/Console/Application.php:943
Stack trace:
#0 [internal function]: Composer\Util\ErrorHandler::handle(2, 'proc_open(): fo...', '/usr/share/php/...', 943, Array)
#1 /usr/share/php/Symfony/Component/Console/Application.php(943): proc_open('stty -a | grep ...', Array, NULL, NULL, NULL, Array)
#2 /usr/share/php/Symfony/Component/Console/Application.php(751): Symfony\Component\Console\Application->getSttyColumns()
#3 /usr/share/php/Symfony/Component/Console/Application.php(712): Symfony\Component\Console\Application->getTerminalDimensions()
#4 /usr/share/php/Symfony/Component/Console/Application.php(645): Symfony\Component\Console\Application->getTerminalWidth()
#5 /usr/share/php/Symfony/Component/Console/Application.php(127): Symfony\Component\Console\Application->renderException(Object(ErrorException), Object(Symfony\Component\Console\Output\StreamOutput))
#6 /usr/share/php/Composer/Console/Application.ph in /usr/share/php/Symfony/Component/Console/Application.php on line 943
composer.json：
{
"name": "laravel/laravel",
"type": "project",
"description": "The Laravel Framework.",
"keywords": [
"framework",
"laravel"
],
"license": "MIT",
"require": {
"php": "^7.1.3",
"fideloper/proxy": "^4.0",
"fzaninotto/faker": "^1.8",
"intervention/image": "^2.4",
"laracasts/utilities": "^3.0",
"laravel/framework": "5.7.*",
"laravel/tinker": "^1.0",
"orangehill/iseed": "^2.6",
"pusher/pusher-php-server": "^3.4",
"tymon/jwt-auth": "^1.0.0",
"wboyz/laravel-enum": "^0.2.1",
"zizaco/entrust": "^1.9"
},
"require-dev": {
"beyondcode/laravel-dump-server": "^1.0",
"beyondcode/laravel-query-detector": "^1.0",
"filp/whoops": "^2.0",
"mockery/mockery": "^1.0",
"nunomaduro/collision": "^2.0",
"phpunit/phpunit": "^7.0",
"xethron/migrations-generator": "^2.0"
},
"config": {
"optimize-autoloader": true,
"preferred-install": "dist",
"sort-packages": true
},
"extra": {
"laravel": {
"dont-discover": []
}
},
"autoload": {
"psr-4": {
"App\\": "app/"
},
"classmap": [
"database/seeds",
"database/factories"
]
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"minimum-stability": "dev",
"prefer-stable": true,
"scripts": {
"post-autoload-dump": [
"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
"@php artisan package:discover --ansi"
],
"post-root-package-install": [
"@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"@php artisan key:generate --ansi"
]
}
}
奇怪的是，我已经在Digital Ocean下的ubuntu 18中以相同的内存量安装了两个应用程序。 在AWS Ubuntu 16上
# lsb_release -d; uname -r; uname -i
Description: Ubuntu 16.04.6 LTS
4.4.0-1084-aws
x86_64
# free
total used free shared buff/cache available
Mem: 1014384 48724 856564 700 109096 824368
Swap: 1048572 264404 784168
在Digital Ocean Ubuntu 18上（两个应用均可正常运行）：
# lsb_release -d; uname -r; uname -i
Description: Ubuntu 18.04.1 LTS
4.15.0-47-generic
x86_64
# free
total used free shared buff/cache available
Mem: 1009156 324640 109012 52520 575504 473160
Swap: 1048572 357888 690684
AWS Ubuntu 16上的错误原因是否可以正确配置某些东西？ 尽管我同时安装和配置了这两个服务器，但是也许我错过了AWS Ubuntu 16上的某些功能？
谢谢！
答案 0 :(得分：1)
这可能很晚，但可能会帮助某人。如果系统在Linux平台上，则只需导航到包含.composer目录的目录，然后将权限设置为允许（递归）所有用户组的（读取，写入，执行）权限。这对我有用
chmod 777 -R /home/$USER/.composer
然后您可以在项目目录中运行
composer update