启动MySQL折腾近一下午
1、开始
[root@letfly ~]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
Job failed. See system logs and 'systemctl status' for details.
[root@letfly ~]# cd /var/log/
[root@letfly log]# more mysqld.log
140812 16:11:56 mysqld_safe Starting mysqld daemon with databases from /var/li
b/mysql
140812 16:11:56 [Note] Plugin 'FEDERATED' is disabled.
140812 16:11:56 InnoDB: The InnoDB memory heap is disabled
140812 16:11:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140812 16:11:56 InnoDB: Compressed tables use zlib 1.2.5
140812 16:11:56 InnoDB: Using Linux native AIO
140812 16:11:56 InnoDB: Initializing buffer pool, size = 128.0M
140812 16:11:56 InnoDB: Completed initialization of buffer pool
140812 16:11:56 InnoDB: highest supported file format is Barracuda.
140812 16:11:56 InnoDB: Waiting for the background threads to start
140812 16:11:57 [ERROR] Do you already have another mysqld server running on port: 3306 ?
查看3306端口
[root@letfly ~]# netstat -tunlp | grep :3306
没结果
折腾了一段时间，果断yum remove mysql
2、接着
[root@letfly ~]# yum install mysql
[root@letfly ~]# yum install mysql-devel
[root@letfly ~]# yum install mysql-server
接着启动MySQL：
[root@letfly ~]# clear
[root@letfly ~]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
Job failed. See system logs and 'systemctl status' for details.
仍不行，查看日志，如下：
[root@letfly ~]# cd /var/log/
[root@letfly log]# more mysqld.log
140812 16:11:56 mysqld_safe Starting mysqld daemon with databases from /var/li
b/mysql
140812 16:11:56 [Note] Plugin 'FEDERATED' is disabled.
140812 16:11:56 InnoDB: The InnoDB memory heap is disabled
140812 16:11:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140812 16:11:56 InnoDB: Compressed tables use zlib 1.2.5
140812 16:11:56 InnoDB: Using Linux native AIO
140812 16:11:56 InnoDB: Initializing buffer pool, size = 128.0M
140812 16:11:56 InnoDB: Completed initialization of buffer pool
140812 16:11:56 InnoDB: highest supported file format is Barracuda.
140812 16:11:56 InnoDB: Waiting for the background threads to start
140812 16:11:57 InnoDB: 1.1.8 started; log sequence number 1595675
140812 16:11:57 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
140812 16:11:57 [Note] - '0.0.0.0' resolves to '0.0.0.0';
140812 16:11:57 [Note] Server socket created on IP: '0.0.0.0'.
140812 16:11:57 [ERROR] Can't start server : Bind on unix socket: No such file
or directory
140812 16:11:57 [ERROR] Do you already have another mysqld server running on s
ocket: /opt/lampp/var/mysql/mysql.sock ?
原来是socket问题
[root@letfly mysql]# find / -name 'my.cnf'
/etc/my.cnf
修改my.cnf里的
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock（你先有的mysql位置）
[root@letfly mysql]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service