CentOS 7下启动、关闭、重启、查看MySQL服务

1.启动命令

[root@iZm5ebqqzqmb5sbsneby3xZ ~]# service mysqld start
Redirecting to /bin/systemctl start  mysqld.service

2.关闭命令

[root@iZm5ebqqzqmb5sbsneby3xZ ~]# service mysqld stop
Redirecting to /bin/systemctl stop  mysqld.service

3.重启命令

[root@iZm5ebqqzqmb5sbsneby3xZ ~]# service mysqld restart
Redirecting to /bin/systemctl restart  mysqld.service

4.查看状态

[root@iZm5ebqqzqmb5sbsneby3xZ ~]# service mysqld status
Redirecting to /bin/systemctl status mysqld.service
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2019-08-13 13:12:58 CST; 1h 0min ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 4210 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 4192 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 4214 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─4214 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Aug 13 13:12:58 iZm5ebqqzqmb5sbsneby3xZ systemd[1]: Starting MySQL Server...
Aug 13 13:12:58 iZm5ebqqzqmb5sbsneby3xZ systemd[1]: Started MySQL Server.

5.查看MySql系统配置

[root@iZm5ebqqzqmb5sbsneby3xZ ~]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid