大家好，我正在运行我的magento网站在亚马逊ec2 linux免费层示例。
几分钟前MySQL随机停止工作后，我在启动MySQL时遇到问题。我在尝试连接时收到此错误：
SQLSTATE[HY 000] [2003]无法连接到“127.0.0.1”上的MySQL服务器（111）
所以我尝试重新启动MySQL（这对我以前有效），我得到了这个：
停止mysqld：[确定] MySQL守护程序无法启动。正在启动mysqld：[失败]
下面是我的mysql错误日志

140707 15:04:09 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
140707 15:04:10 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140707 15:04:10 [Note] Plugin 'FEDERATED' is disabled.
140707 15:04:10 InnoDB: The InnoDB memory heap is disabled
140707 15:04:10 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140707 15:04:10 InnoDB: Compressed tables use zlib 1.2.7
140707 15:04:10 InnoDB: Using Linux native AIO
140707 15:04:10 InnoDB: Initializing buffer pool, size = 128.0M
140707 15:04:10 InnoDB: Completed initialization of buffer pool
140707 15:04:10 InnoDB: highest supported file format is Barracuda.
140707 15:04:10  InnoDB: Waiting for the background threads to start
140707 15:04:11 InnoDB: 5.5.38 started; log sequence number 14130260
140707 15:04:11 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
140707 15:04:11 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
140707 15:04:11 [Note] Server socket created on IP: '0.0.0.0'.
140707 15:04:11 [Note] Event Scheduler: Loaded 0 events
140707 15:04:11 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.38'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)
140707 18:32:03 mysqld_safe Number of processes running now: 0
140707 18:32:03 mysqld_safe mysqld restarted
140707 18:32:04 [Note] Plugin 'FEDERATED' is disabled.
140707 18:32:05 InnoDB: The InnoDB memory heap is disabled
140707 18:32:05 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140707 18:32:05 InnoDB: Compressed tables use zlib 1.2.7
140707 18:32:05 InnoDB: Using Linux native AIO
140707 18:32:05 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
140707 18:32:05 InnoDB: Completed initialization of buffer pool
140707 18:32:05 InnoDB: Fatal error: cannot allocate memory for the buffer pool
140707 18:32:05 [ERROR] Plugin 'InnoDB' init function returned error.
140707 18:32:05 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140707 18:32:05 [ERROR] Unknown/unsupported storage engine: InnoDB
140707 18:32:05 [ERROR] Aborting

下面是我的etc/my.cnf文件
[mysqld]数据目录=/var/lib/mysql套接字=/var/lib/mysql/mysql.sock

建议禁用symbolic-links以防止各种安全风险symbolic-links=0

使用systemd时忽略设置用户和组。

如果需要在不同的用户或组下运行mysqld，

为mysqld定制systemd单元文件，根据

http://fedoraproject.org/wiki/Systemd中的指令数
[mysqld_safe]日志错误=/变量/日志/mysqld.日志PID文件=/变量/运行/mysqld/mysqld.pid
在var/lib/mysql中我找不到日志文件mysql.sock，但是我的默认套接字指向var/lib/mysql/mysql.sock
我的mysql版本（5.5）
如果我键入命令
mysql --显示的版本
mysql版本14.14 Distrib 5.5.38，适用于使用读取行5.1的Linux（x86_64）
请建议我该怎么做。我得到这个错误的时间，几个小时我的网站工作正常，我得到这个错误后，一段时间，所以请建议我如何永久解决这个问题。
如果你需要任何其他细节，请列出我。
先谢了。