启动MySQL报错_MySQL
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当在linux系统中启动mysql服务的时候service mysqld start时
报:Another MySQL daemon already running with the same unix socket.
解决办法。
原因多个Mysql进程使用了同一个socket。
两个方法解决:
第一个是立即关机 使用命令 shutdown -h now 关机,关机后在启动,进程就停止了。
第二个直接把mysql.sock文件改名即可。也可以删除,推荐改名。
方法 mv /var/lib/mysql/mysql.sock /var/lib/mysql/mysql.sock.bak
然后就可以启动mysql,这时会重新创建一个mysql.sock文件。
mysql.sock文件的讲解在网上找了如下解释,在此转载
这个mysql.sock应该是mysql的主机和客户机在同一host上的时候,使用unix domain socket做为通讯协议的载体,它比tcp快。通常遇到这个问题的原因就是你的mysql server没运行起来。
Mysql有两种连接方式:
(1),TCP/IP
(2),socket
对mysql.sock来说,其作用是程序与mysqlserver处于同一台机器,发起本地连接时可用。
例如你无须定义连接host的具体IP得,只要为空或localhost就可以。
在此种情况下,即使你改变mysql的外部port也是一样可能正常连接。
因为你在my.ini中或my.cnf中改变端口后,mysql.sock是随每一次 mysql server启动生成的。已经根据你在更改完my.cnf后重启mysql时重新生成了一次,信息已跟着变更。
那么对于外部连接,必须是要变更port才能连接的。
linux下安装mysql连接的时候经常回提示说找不到mysql.sock文件,解决办法很简单:
如果是新安装的mysql,提示找不到文件,就搜索下,指定正确的位置。
如果mysql.sock文件误删的话,就需要重启mysql服务,如果重启成功的话会在datadir目录下面生成mysql.sock 到时候指定即可。
如果还不行就选择用TCP连接方式连接就行了,其实windows下还支持管道连接方式。

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