1、通过wget下载MySQL的rpm

wget https://repo.mysql.com/yum/mysql-5.7-community/el/7/x86_64/mysql-community-common-5.7.38-1.el7.x86_64.rpm
wget https://repo.mysql.com/yum/mysql-5.7-community/el/7/x86_64/mysql-community-libs-5.7.38-1.el7.x86_64.rpm
wget https://repo.mysql.com/yum/mysql-5.7-community/el/7/x86_64/mysql-community-client-5.7.38-1.el7.x86_64.rpm
wget https://repo.mysql.com/yum/mysql-5.7-community/el/7/x86_64/mysql-community-server-5.7.38-1.el7.x86_64.rpm
1
2
3
4

2、检查是否已经安装mysql或者mariadb

[root@localhost ~]# rpm -qa | grep mysql
[root@localhost ~]# rpm -qa | grep mariadb
1
2

如果安装过，上面命令会检查出相关安装信息，将其卸载

#卸载MySQL
rpm -qa | grep mysql | xargs  rpm -e --nodeps
#卸载mariadb
rpm -qa | grep mariadb| xargs  rpm -e --nodeps
1
2
3
4

3、依次安装如下4个文件即可

[root@localhost mysql]# rpm -ivh mysql-community-common-5.7.38-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-libs-5.7.38-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-client-5.7.38-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-server-5.7.38-1.el7.x86_64.rpm
1
2
3
4

在安装server文件时，可能还会提示缺失其他依赖包，比如：net-tools，根据提示逐一下载相关依赖包并安装，全部依赖解决完后，再安装mysql-community-server这个rpm文件。缺失的依赖包推荐到这里下载：https://centos.pkgs.org/7/centos-x86_64/

至此，mysql5.7所有文件安装完毕，接下来就是开启服务了。

4、修改配置文件

修改配置文件my.cnf，设置免密登陆

[root@localhost ~]# vim /etc/my.cnf
### 可以参考如下内容
[mysql]
default-character-set=utf8

[mysqld]
datadir=/data/mysql
socket=/data/mysql/mysql.sock
slow_query_log = ON
slow_query_log_file = /var/log/mysql_slow_query.log
long_query_time = 3
symbolic-links=0
log-error=/data/mysql/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
log-bin=mysql-bin
thread_cache_size=100
server-id=33
back_log=500
lower_case_table_names=1
#thread_concurrency=80
#thread_concurrency=32
query_cache_limit=12M
query_cache_size=512M
query_cache_type=1
character-set-server=utf8mb4
max_connections=3000
innodb_buffer_pool_size=12G
innodb_file_per_table=ON
innodb_log_file_size=3G
expire_logs_days=5
read_only=1
lower_case_table_names=1
skip-name-resolve
[client]
socket=/data/mysql/mysql.sock
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

5、启动MySQL

systemctl restart mysqld
1

启动时间较长，需要耐心等待，预计再10分钟左右，因为需要数据库初始化。

6、查看MySQL初始密码

通过my.cnf文件找到/data/mysql/mysqld.log文件，在改文件中根据password关键字查询初始密码

#查看log-error指定的数据目录
[root@admin02 ~]# cat /etc/my.cnf | grep log-error
log-error=/data/mysql/mysqld.log

#查看初始化密码
[root@admin02 ~]# cat /data/mysql/mysqld.log | grep localhost
2022-07-05T16:48:26.206485Z 1 [Note] A temporary password is generated for root@localhost: B9eldAjOiu=(
1
2
3
4
5
6
7

查看密码后，就可以使用该密码登录到MySQL，并进行后续的操作

7、登录MySQL

[root@admin02 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.38-log MySQL Community Server (GPL)

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> set global validate_password_policy = 0;
Query OK, 0 rows affected (0.00 sec)

mysql> SET PASSWORD = PASSWORD('root');
Query OK, 0 rows affected (0.00 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

安装完成！