我遇到了一个反复出现的问题，为什么我的ubuntu服务器在过去两天的同一时间内完全无法使用。在崩溃期间我甚至无法通过SSH进入它。
Ubuntu服务器位于amazon aws t2.micro实例上，运行在1 gb ram上，Ubuntu 16.04 apache错误日志如下所示
[Wed Aug 30 18:02:23.710072 2017] [autoindex:error] [pid 7505] [client 60.191.38.77:57957] AH01276: Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.html,index.cgi,$
[Wed Aug 30 18:02:23.710126 2017] [:error] [pid 7505] [client 60.xx.xx.xx:57957] script '/var/www/html/404.php' not found or unable to stat
[Wed Aug 30 19:11:54.375001 2017] [autoindex:error] [pid 11307] [client 45.55.21.189:52050] AH01276: Cannot serve directory /var/www/html/: No matching DirectoryIndex (index.html,index.cgi$
[Wed Aug 30 19:11:54.376134 2017] [:error] [pid 11307] [client 45.xx.xx.xx:52050] script '/var/www/html/404.php' not found or unable to stat
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
mmap() failed: [12] Cannot allocate memory
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[Wed Aug 30 20:50:00.570286 2017] [core:notice] [pid 31139] AH00051: child pid 17670 exit signal Aborted (6), possible coredump in /etc/apache2
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[Wed Aug 30 21:03:27.234926 2017] [core:notice] [pid 31139] AH00051: child pid 18507 exit signal Aborted (6), possible coredump in /etc/apache2
[Wed Aug 30 21:03:27.354905 2017] [core:notice] [pid 31139] AH00051: child pid 18511 exit signal Aborted (6), possible coredump in /etc/apache2
[Wed Aug 30 21:03:27.354927 2017] [core:notice] [pid 31139] AH00051: child pid 18512 exit signal Aborted (6), possible coredump in /etc/apache2
[Wed Aug 30 21:03:42.865027 2017] [core:notice] [pid 31139] AH00051: child pid 18506 exit signal Aborted (6), possible coredump in /etc/apache2
[Wed Aug 30 21:03:46.984235 2017] [core:notice] [pid 31139] AH00051: child pid 18529 exit signal Aborted (6), possible coredump in /etc/apache2
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[crit] Memory allocation failed, aborting process.
[Wed Aug 30 21:14:50.194072 2017] [core:notice] [pid 31139] AH00051: child pid 18605 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Aug 30 21:14:50.482541 2017] [core:notice] [pid 31139] AH00051: child pid 18618 exit signal Aborted (6), possible coredump in /etc/apache2
[Thu Aug 31 07:09:50.271441 2017] [mpm_prefork:notice] [pid 1321] AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Aug 31 07:09:50.274044 2017] [core:notice] [pid 1321] AH00094: Command line: '/usr/sbin/apache2'
根据AWS上的日志和流量监视器，服务器将于8月30日星期三19:11:54左右无法访问。
我对Apache在内存和并发连接方面的工作原理知之甚少。我所拥有的网站流量很低。是否有一些配置文件我可能搞砸了？ .BTW memory_limit是-1没有限制根据PHP文档或我该怎么做才能找到问题的原因，我正在考虑将服务器文件迁移到AWS beanstalk实例（部署助手加扩展助手，AFAIK）a全新的开始。
在那里，我可以知道可能导致崩溃的脚本。我有太多的脚本加上laravel PHP框架+第三方脚本运行真的很难勾勒出哪一个是可疑的。
我非常感谢一个解释错误log.i.e的答案
借用@arkascha在评论中所说的，崩溃是由一些使用大量内存但未经过优化的脚本引起的。以下步骤将帮助其他人面临类似问题。