centosvpsmysql5.6.17安装后启动失败

不管是rpm 包还是源代码包，安装后启动 mysql 总是提示：
Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/HOSTNAME.pid).
进入/usr/bin/ 执行mysqld_safe 提示：
140429 21:29:02 mysqld_safe Logging to '/var/lib/mysql/chernikite.err'.
140429 21:29:02 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/bin/mysqld_safe: line 166:   532 已杀死               nohup /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/HOSTNAME.err --pid-file=/var/lib/mysql/HOSTNAME.pid < /dev/null >> /var/lib/mysql/HOSTNAME.err 2>&1
140429 21:29:02 mysqld_safe mysqld from pid file /var/lib/mysql/HOSTNAME.pid ended
打开 /var/lib/mysql/chernikite.err没有任何有用信息：
[root@HOSTNAME bin]# cat /var/lib/mysql/HOSTNAME.err
140429 21:27:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140429 21:27:23 mysqld_safe mysqld from pid file /var/lib/mysql/chernikite.pid ended
140429 21:29:02 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140429 21:29:02 mysqld_safe mysqld from pid file /var/lib/mysql/HOSTNAME.pid ended
求助啊
vps 是单核 512M内存 centos 6.3