mysql重启

MySQL8.0启动和关闭流程
启动方式

1、 mysqld_safe &（推荐）：这个脚本会监控mysqld的状态，日志会记录到文件里

2、 mysqld &                           日志打印到屏幕上

3、 mysql.server

调用的执行过程：systemd ——>/etc/init.d/mysqld——–>mysql.server——>mysqld_safe &—–>mysqld &

关闭方式

mysql> shutdown;

systemctl stop mysqld

service mysqld stop

service mysqld start

mysqladmin -uroot -p123456 shutdown

忘记管理员密码
1、关闭数据库

[root@localhost ~]# /etc/init.d/mysqld stop

Shutting down MySQL… SUCCESS!
2、启动安全模式

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[root@localhost ~]# mysqld_safe –skip-grant-tables –skip-networking &

[1] 1475

[root@localhost ~]# 2020-01-18T14:07:12.861565Z mysqld_safe Logging to ‘/data/mysql/data_3306/localhost.err’.

2020-01-18T14:07:12.898677Z mysqld_safe Starting mysqld daemon with databases from /data/mysql/data_3306
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3、登录数据库，修改密码，报错：没有加载授权表

[root@localhost ~]# mysql -uroot -p123

mysql> alter user root@’localhost’ identified by ‘123456’;

ERROR 1290 (HY000): The MySQL server is running with the –skip-grant-tables option so it cannot execute this statement
4、手工加载授权表

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mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> alter user root@’localhost’ identified by ‘123456’;

Query OK, 0 rows affected (0.00 sec)
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5、重启数据库

[root@localhost ~]# /etc/init.d/mysqld restart

Shutting down MySQL…2020-01-18T15:09:46.575313Z mysqld_safe mysqld from pid file /data/mysql/data_3306/localhost.pid ended

SUCCESS!
3、 测试密码

[root@localhost ~]# mysql -uroot -p123456

mysql>

Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’

1、先通过：service mysqld status 查看mysql是否启动

（没装mysql service 也可通过 /etc/rc.d/init.d/mysqld status查看）

      若没启动，则启动mysql：service  mysqld  start

2、方法： 修改/etc/my.conf:

[mysqld]
datadir=/usr/local/mysql/data

socket=/var/lib/mysql/mysql.sock

[mysql.server]
user=mysql
basedir=/usr/local/mysql

[client]
socket=/var/lib/mysql/mysql.sock

If there is not currently a section called [client], add one at the bottom of the file and copy the socket= line under the [mysqld] section such as:
（注意：红色标记部分文件路径必须相同）

发现依旧如此，运行/etc/init.d/mysql start报错：Starting MySQLCouldn’t find MySQL manager or server
是mysqld服务没启，运行/usr/local/mysql/bin/mysqld_safe &