mysql安装后无法启动

1、在安装mysql的过程中出现了错误，导致无法启动数据库

/usr/local/mysql/libexec/mysqld: File './mysql-bin.index' not found (Errcode: 13)

提示./mysql-bin.index无法找到（由于mysql开启了bin日志功能），到数据库根目录查看该文件是存在的，可能是文件权限的问题。
把权限更改下就好了

chown  -R  mysql.mysql /usr/local/mysql
chown  -R  mysql.mysql /data/mysql_data/

2、把权限该了下，重新启动下mysql。居然发现还是不能启动数据库。

/usr/local/mysql/libexec/mysqld: Table 'mysql.plugin' doesn't exist
090810 11:02:56 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
090810 11:02:56 [ERROR] /usr/local/mysql/libexec/mysqld: unknown option '--skip-innodb'
090810 11:02:56 [ERROR] Aborting

网上找了下方法，没找到明确的解决方法，直接就用初始化脚本，进行了初始化。
/usr/local/mysql/bin/mysql_install_db --user=mysql --datadir=/data/mysql_data
3、初始化后居然又报错了。真心蛋疼

120710 11:01:38 InnoDB: Initializing buffer pool, size = 12.0G
InnoDB: mmap(8791261184 bytes) failed; errno 12
120710 11:01:38 InnoDB: Completed initialization of buffer pool
120710 11:01:38 InnoDB: Fatal error: cannot allocate memory for the buffer pool
120710 11:01:38 [ERROR] Plugin 'InnoDB' init function returned error.
120710 11:01:38 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
120710 11:01:38 [ERROR] Unknown/unsupported storage engine: InnoDB
120710 11:01:38 [ERROR] Aborting

这个报错很明显了，是innodb的buffer pool太大导致的，改下配置文件。
4、改完后终于启动了。

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