本文以 mysql-8.0.28 为例，编写安装教程，本文安装环境是 CentOS
1. 首先在官网下载对应版本，此步骤我相信大家都会，就不再赘述
2. 创建 mysql 组和 mysql 用户
```shell
shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
```
3. 将下载的 MySQL 压缩文件，拷贝到 /usr/local/, 并解压，创建软连接
```shell
shell> cp mysql-8.0.28-linux-glibc2.12-x86_64.tar.xz /usr/local
shell> tar -xvf mysql-8.0.28-linux-glibc2.12-x86_64.tar.xz
shell> ln -s mysql-8.0.28-linux-glibc2.12-x86_64 mysql
```
4. 创建 mysql-files 并修改其属主和属组
```shell
shell> cd mysql
shell> mkdir mysql-files
shell> chown mysql:mysql mysql-files
shell> chmod 750 mysql-files
```
5. 创建 MySQL 数据目录，创建 MySQL 全局配置文件
```shell
# 创建数据文件
shell> cd /opt
shell> mkdir -p mysql_data/mysql80
# 创建配置文件
shell> vim my.cnf
# 内容如下
[mysqld]
port = 3306
user = mysql
datadir = /opt/mysql_data/mysql80
log_error = error.log
```
6. 初始化数据，并修改 MySQL 安装目录的属组为 root
```shell
shell> bin/mysqld --initialize --user=mysql # --initialize-insecure 无密码
bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
shell> yum install libaio
shell> mysqld --initialize --user=mysql # 再次执行成功
shell> bin/mysql_ssl_rsa_setup
shell> chown -R root .
```
7. 启动 MySQL
```shell
shell> cp support-files/mysql.server /etc/init.d/mysqld
shell> service mysqld start # 启动 mysql 服务，或者： systemctl start mysqld
shell> service mysqld status # 查看 mysql 状态，或者： systemctl status mysqld
shell> service mysqld stop # 停止 mysql 服务，或者： systemctl stop mysqld
```
8. 登录 MySQL
```shell
shell> export PATH=/usr/local/mysql/bin:$PATH #配置环境变量
shell> mysql -uroot -p # 再次登录，在 /opt/mysql_data/mysql80/error.log 查找密码，如下：
2022-03-03T03:33:49.812373Z 1 [Note] A temporary password is generated for root@localhost: 4ojuihu(OhBw
```
9. 修改密码
```shell
shell> mysql -uroot -p # 登录
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.28 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 password = '123'; # 修改密码
```
至此，现在企业常用 MySQL 版本的安装教程都写完了，安装完成之后如何链接 MySQL呢？下一篇说一下 MySQL 的链接 ，敬请期待......
大家加油！！！
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