One 、 download mysql Compressed package

Download address Check if there are any installed mysql
```
rpm -qa | grep mysql If any , Uninstall the lower version of MySQLrpm -e --nodeps mysql*
```
3、 ... and 、 see Mariadb Version and delete
```
 View currently installed mariadb package ：rpm -qa | grep mariadb All uninstalled ：rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64（ This version is based on CentOS7 It depends on the version in ）
```
Four 、 Delete /etc Under the my.cnf
The specific command is as follows ：
```
# cd /etc# rm my.cnf
```
5、 ... and 、 install mysql
1、 Create in the root directory data/ Catalog
```
mkdir data
```
2、 Put the zip into that directory and unzip
```
tar -xvf mysql-5.6.43-linux-glibc2.12-x86_64.tar.gz
```
3、 Modify the folder name after decompression
```
mv mysql-5.6.43-linux-glibc2.12-x86_64 mysql-5.6.43
```
4、 establish MySQL Users and user groups
- Execute the following command to create mysql User group
```
[root@localhost~]# groupadd mysql
```
- Execute the following command to create a user name of mysql And join mysql User group
```
[root@localhost ~]# useradd -g mysql mysql
```
5、 Copy profile
```
cp /data/mysql-5.6.43/support-files/my-default.cnf /etc/my.cnf
```
- Modify the configuration file
```
vi /etc/my.cnf
```
Bear in mind ： In the configuration file socket=/tmp/mysql.sock, Otherwise, the database cannot be started
- Initialize database
6、 Modify the permissions
```
cd /data/mysql-5.6.43chown -R mysql.mysql /data/mysql-5.6.43
```
7、 mount this database
```
[root@localhost mysql-5.6.43] # ./scripts/mysql_install_db --user=mysql
```
- Modify the current data Directory owner is mysql user
```
[root@localhost mysql-5.6.43] # chown -R mysql.mysql /data/mysql-5.6.43
```
6、 ... and 、 To configure MySQL
1、 grant my.cnf The maximum authority of .
```
[root@localhost mysql-5.6.43]# chown 777 /etc/my.cnf
```
2、 Set the startup service control script ：
```
 
```
3、 Copy the startup script to the resource directory
```
[root@localhost mysql-5.6.43]# cp ./support-files/mysql.server /etc/rc.d/init.d/mysqld
```
4、 increase mysqld Service control script execution authority
```
[root@localhost mysql]# c.........
```

Centos7 install MySQL database

One 、 download mysql Compressed package

3、 ... and 、 see Mariadb Version and delete

Four 、 Delete /etc Under the my.cnf

5、 ... and 、 install mysql

1、 Create in the root directory data/ Catalog

2、 Put the zip into that directory and unzip

3、 Modify the folder name after decompression

4、 establish MySQL Users and user groups

5、 Copy profile

6、 Modify the permissions

7、 mount this database

6、 ... and 、 To configure MySQL

1、 grant my.cnf The maximum authority of .

2、 Set the startup service control script ：

3、 Copy the startup script to the resource directory

4、 increase mysqld Service control script execution authority