# CentOS 7下启动、关闭、重启、查看MySQL服务

### 1.启动命令

```shell

[root@xufeng Desktop]# service mysqld start

Redirecting to /bin/systemctl start mysqld.service

```

### 2.关闭命令

```shell

[root@xufeng ~]# service mysqld stop

Redirecting to /bin/systemctl stop mysqld.service

```

### 3.重启命令

```shell

[root@xufeng ~]# service mysqld restart

Redirecting to /bin/systemctl restart mysqld.service

```

### 4.查看服务状态

```shell

[root@xufeng ~]# service mysqld status

Redirecting to /bin/systemctl status mysqld.service

● mysqld.service - MySQL Server

Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)

Active: active (running) since Wed 2018-07-18 22:34:06 EDT; 1min 11s ago

Docs: man:mysqld(8)

http://dev.mysql.com/doc/refman/en/using-systemd.html

Process: 4366 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)

Process: 4345 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)

Main PID: 4370 (mysqld)

CGroup: /system.slice/mysqld.service

└─4370 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Jul 18 22:34:04 xufeng.goertek.com systemd[1]: Starting MySQL Server...

Jul 18 22:34:06 xufeng.goertek.com systemd[1]: Started MySQL Server.

```

### 5.查看MySql系统配置

```shell

[root@xufeng ~]# 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

```

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编辑

Web IDE

原始数据

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历史

如何启动/停止/重启MySQL

一、启动方式

1、使用 service 启动：service mysqld start

2、使用 mysqld 脚本启动：/etc/inint.d/mysqld start

3、使用 safe_mysqld 启动：safe_mysqld&

二、停止

1、使用 service 启动：service mysqld stop

2、使用 mysqld 脚本启动：/etc/inint.d/mysqld stop

3、 mysqladmin shutdown

三、重启

1、 使用 service 启动：service mysqld restart

2、使用 mysqld 脚本启动：/etc/inint.d/mysqld restart

提问 编辑摘要

刚开始学 mysql时都是用redhat自带的。启动是什么 /rc.d/init.d/ start

这很简单，但是后来越学越多，系统自带的 mysql，有的是版本太低，有的是与

自己想要装的web服务需要的低版本的mysql

后来自己学着以tar的方式安装 mysql，我的mysql装在/usr/local/mysql目录下启

动碰到过很多问题。最常见的是：

ERROR 2002: Can't connect to local MySQL server through socket

'/tmp/mysql.sock' (111)

解决办法：

[root@test mysql]# /usr/local/mysql/bin/mysqladmin -u root /

> -S /var/lib/mysql/mysql.sock password 'your.passwd'

或者做个连接

ln -s /var/lib/mysql/mysql.sock /tmp

其实提示找不到 /tmp/mysql.sock有时也并不是/tmp目录下没这个文件，是启动

命令不对，我碰到过

常见的几种启动方式，自己也不是记得很 清楚，如果你确定tmp下有mysql.sock这

个文件不妨试试另外的几个命令

/usr/local/mysql/bin/mysql -u root -p

/usr/local/mysql/bin/mysqld --user=mysql&

/usr/local/mysql/bin/mysqld --user=root&

/usr/local/mysql/bin/mysqld_safe --user=root&

/usr/local/mysql/bin/mysqld_safe --user=mysql&

/usr/local/mysql/bin/safe_mysqld--uer=root&(注意 safe_mysqld与mysqld_safe是不同的，&表示mysql在后台运行)我的就会报错了

STOPPING server from pid file

/usr/local/mysql/data/localhost.localdomain.pid

060304 11:46:21 mysqld ended

这是权限问题，我的mysql目录属于root用户，也属于root群组，改用 mysqld_safe启动就没问题了，

大家只要注意这几个 mysql,safe_mysqld,mysqld_safe,mysqld,mysqladmin.多试

几次

其实有时mysql已经正 常启动了，查看mysql是否启动命令

ps -aux | grep mysqld

会看到如下类似内容

mysql 6394 0.0 1.5 10528 992 pts/3 S 16:16 0:00

/usr/local/mysql/

mysql 6395 0.0 1.5 10528 992 pts/3 S 16:16 0:00

/usr/local/mysql/

mysql 6396 0.0 1.5 10528 992 pts/3 S 16:16 0:00

/usr/local/mysql/

root 6422 0.0 1.1 2408 732 pts/3 S 16:20 0:00 grep

mysql

查看mysql是否在监 听端口命令

netstat -tl | grep mysql

会看到如下类似内容

tcp 0 0 *:mysql *:* LISTEN

1.启动命令

[root@xufeng Desktop]# service mysqld start

Redirecting to /bin/systemctl start mysqld.service

2.关闭命令

[root@xufeng ~]# service mysqld stop

Redirecting to /bin/systemctl stop mysqld.service

3.重启命令

[root@xufeng ~]# service mysqld restart

Redirecting to /bin/systemctl restart mysqld.service

4.查看服务状态

[root@xufeng ~]# service mysqld status

Redirecting to /bin/systemctl status mysqld.service

● mysqld.service - MySQL Server

Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)

Active: active (running) since Wed 2018-07-18 22:34:06 EDT; 1min 11s ago

Docs: man:mysqld(8)

http://dev.mysql.com/doc/refman/en/using-systemd.html

Process: 4366 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)

Process: 4345 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)

Main PID: 4370 (mysqld)

CGroup: /system.slice/mysqld.service

└─4370 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

Jul 18 22:34:04 xufeng.goertek.com systemd[1]: Starting MySQL Server...

Jul 18 22:34:06 xufeng.goertek.com systemd[1]: Started MySQL Server.

5.查看MySql系统配置

[root@xufeng ~]# 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

---------------------

作者：xufengzhu

来源：CSDN

原文：https://blog.csdn.net/xufengzhu/article/details/81110982

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