1.登录mysql
mysql -u root -p
2.查看当前端口号
show global variables like 'port';
3.修改端口：编辑/etc/my.cnf文件
vi /etc/my.cnf
4. 增加或修改端口参数，然后保存退出
[mysqld]
port=3308
log-bin=mysql-bin
server-id=2
max_allowed_packet=10M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
#
# include all files from the config directory
#
!includedir /etc/my.cnf.d
5.重启mysql
service mysqld restart