1、首先在root用户条件下，进行安装mysql，一些运行正常
2、但我在查看状态的时候，却出错了，显示
[root@spark01 ~]# service mysql start
Starting MySQL SUCCESS!
[root@spark01 ~]# service mysql status
ERROR! Multiple MySQL running but PID file could not be found (4751 4598)
3、这有可能是进程的问题
我们通过ss -tnl命令，发现服务仍然存在，服务假死，强行将服务停用，参照一下步骤，问题解决！！1
[root@spark01 ~]#service mysql restart
ERROR! MySQL server PID file could not be found!
Starting MySQL...........^Z
[3]+ Stopped service mysql restart
[root@spark01 ~]# ss -tnl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 *:50020 *:*
LISTEN 0 128 192.168.242.166:9000 *:*
LISTEN 0 80 :::3306 :::*
LISTEN 0 128 *:50090 *:*
LISTEN 0 128 *:50070 *:*
LISTEN 0 128 :::22 :::*
LISTEN 0 128 *:22 *:*
LISTEN 0 128 127.0.0.1:631 *:*
LISTEN 0 128 ::1:631 :::*
LISTEN 0 128 *:50010 *:*
LISTEN 0 128 *:50075 *:*
[root@spark01 ~]# killall mysqld
[root@spark01 ~]# service mysql start
Starting MySQL SUCCESS!
[root@spark01 ~]# service mysql status
SUCCESS! MySQL running (5094)