Linux 本地启动mysql对应的3306端口也启动的情况下无法远程连接

1.运行netstat -talnp命令行看3306是否打开

netstat -talnp

如返回中有

tcp6       0      0 :::3306                 :::*                    LISTEN      21498/mysqld

则证明3306已开启。

2.运行lsof -i:3306命令行查询3306是否被使用

lsof -i:3306

3.运行ps aux|grep mysql命令行看mysql是否在运行

ps aux|grep mysql

root     21353  0.0  0.1   9656  1560 pts/0    S    18:56   0:00 /bin/sh /opt/lampp/bin/mysqld_safe --datadir=/opt/lampp/var/mysql --pid-file=/opt/lampp/var/mysql/VM_42_114_centos.pid

mysql    21498  0.0  5.9 970100 60708 pts/0    Sl   18:56   0:00 /opt/lampp/sbin/mysqld --basedir=/opt/lampp --datadir=/opt/lampp/var/mysql --plugin-dir=/opt/lampp/lib/mysql/plugin/ --user=mysql --log-error=/opt/lam

pp/var/mysql/VM_42_114_centos.err --pid-file=/opt/lampp/var/mysql/VM_42_114_centos.pid --socket=/opt/lampp/var/mysql/mysql.sock --port=3306

root     23702  0.0  0.0   9032   672 pts/0    R+   19:30   0:00 grep --color=auto mysql

即mysql服务在linux本地运行正常。

结论：mysql服务虽然在运行，可以在本地操作，但没有运行在3306端口。

此时修改mysql的配置文件如在xampp情况是在 ./lampp/etc my.cnf中

#Don’t listen on a TCP/IP port at all. This can be a security enhancement,

#if all processes that need to connect to mysqld run on the same host.

#All interaction with mysqld must be made via Unix sockets or named pipes.

#Note that using this option without enabling named pipes on Windows

#(via the “enable-named-pipe” option) will render mysqld useless!

将此段下面的参数skip-networking注释重启mysql服务，远程连接mysql正常。

#skip-networking

原因：参数skip-networking起的作用是：mysql不再在TCP / IP端口上进行监听，导致无法远程连接。