mysql start The server quit without updating PID fil[FAILED]

启动mysql数据库提示：
[root@node3 mysql-5.6.13]# /etc/init.d/mysql start
Starting MySQL.....The server quit without updating PID fil[FAILED]01/mysql/node3.pid).
[root@node3 mysql-5.6.13]# /etc/init.d/mysql restart

 检查是否已存在启动进程：

[root@node3 mysql-5.6.13]# ps aux |grep mysql
root      1486  0.0  0.0 108332   928 ?        S    Aug15   0:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data01/mysql --pid-file=/var/run/mysqld/mysqld.pid
mysql     1866  0.0  4.7 1422764 48500 ?       Sl   Aug15   0:48 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data01/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/var/log/mysql/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/data01/mysql/mysql.sock
root     27112  0.0  0.0 105312   848 pts/2    S+   15:25   0:00 grep mysql

[root@node3 mysql-5.6.13]# /etc/init.d/mysql start
Starting MySQL.                                            [  OK  ]