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1、卸载mariadb

由于银河麒麟v10系统默认安装了mariadb 会与Mysql相冲突，因此首先需要卸载系统自带的mariadb
查看系统上默认安装的Mariadb软件包
使用yum查看已经安装的mariadb软件包

yum list --installed mariadb

rpm -qa|grep mariadb

查看默认的mariadb配置文件

在这里插入代码片

默认的配置文件是 /etc/my.cnf

查看默认的mariadb配置目录

find / -type d  -name my.cnf*

使用yum卸载 mariadb

yum remove mariadb.x86_64

验证卸载Mariadb成功

查看Mariadb配置文件和目录是否还存在 已经不存在了

至此mariadb卸载完成

2、下载Mysql安装包

访问官网下载链接 链接: https://dev.mysql.com/downloads/mysql/

选择如下 点击下载按钮 下载安装包

选择 mysql-8.0.35-1.el8.x86_64.rpm-bundle.tar 点击下载

为什么选择redhat 8的操作系统版本呢？
https://www.kylinos.cn/about/news/814.html
通过查询麒麟官网得知，银河麒麟高级服务器操作系统是兼容centos8的，centos8和redhat8兼容。

3、安装Mysql 8.35

官方安装文档
链接: https://dev.mysql.com/doc/mysql-installation-excerpt/8.0/en/linux-installation-rpm.html

RPM Packages for MySQL Community Edition

Package Name	Summary
mysql-community-client	MySQL client applications and tools
mysql-community-client-plugins	Shared plugins for MySQL client applications
mysql-community-common	Common files for server and client libraries
mysql-community-devel	Development header files and libraries for MySQL database client applications
mysql-community-embedded-compat	MySQL server as an embedded library with compatibility for applications using version 18 of the library
mysql-community-icu-data-files	MySQL packaging of ICU data files needed by MySQL regular expressions
mysql-community-libs	Shared libraries for MySQL database client applications
mysql-community-libs-compat	Shared compatibility libraries for previous MySQL installations; only present if previous MySQL versions are supported by the platform
mysql-community-server	Database server and related tools
mysql-community-server-debug	Debug server and plugin binaries
mysql-community-test	Test suite for the MySQL server
mysql-community	The source code RPM looks similar to mysql-community-8.0.35-1.el7.src.rpm, depending on selected OS
Additional debuginfo RPMs	There are several debuginfo packages: mysql-community-client-debuginfo, mysql-community-libs-debuginfo mysql-community-server-debug-debuginfo mysql-community-server-debuginfo, and mysql-community-test-debuginfo.

rpm包的名称格式：packagename-version-distribution-arch.rpm

3.1、安装Mysql 8.35

安装命令如下

tar -xvf mysql-8.0.35-1.el8.x86_64.rpm-bundle.tar

cd mysql-8.0.35-1.el8.x86_64.rpm-bundle

sudo yum install mysql-community-{client,client-plugins,common,libs}-*

安装完成后，查看mysql的root账户默认密码

grep 'temporary password' /var/log/mysqld.log

安装完成后 后形成以下目录和文件

Files or Resources	Location
Files or Resources	Location
Client programs and scripts	/usr/bin
mysqld server	/usr/sbin
Configuration file	/etc/my.cnf
Data directory	/var/lib/mysql
Error log file	For RHEL, Oracle Linux, CentOS or Fedora platforms: /var/log/mysqld.log
Value of secure_file_priv	/var/lib/mysql-files
System V init script	For RHEL, Oracle Linux, CentOS or Fedora platforms: /etc/init.d/mysqld
Systemd service	For RHEL, Oracle Linux, CentOS or Fedora platforms: mysqld
Pid file	/var/run/mysql/mysqld.pid
Socket	/var/lib/mysql/mysql.sock
Keyring directory	/var/lib/mysql-keyring
Unix manual pages	/usr/share/man
Include (header) files	/usr/include/mysql
Libraries	/usr/lib/mysql
Miscellaneous support files (for example, error messages, and character set files)	/usr/share/mysql

安装完后 会产生一个名为mysql 的系统用户,和一个名为mysql 的系统用户组。

切换到mysql用户命令

su - mysql --shell=/bin/bash

安装后默认不会启动Mysql服务，启动mysql命令

systemctl start mysqld

此启动mysql命令做下面这些事情

1. 初始化mysql服务
2. 产生ssl证书和密钥在Mysql数据目录下
3. validate_password默认安装。validate_password实现的默认密码策略要求密码至少包含一个大写字母、一个小写字母、一位数字和一个特殊字符，并且密码总长度至少为8个字符。
4. 已创建超级用户帐户“root”@“localhost”。超级用户的密码已设置并存储在错误日志文件中。查看mysql的root账户默认密码 grep 'temporary password' /var/log/mysqld.log

如果在安装过程中出现问题，您可能会在错误日志文件/var/log/mysqld.log中找到日志信息。

下面这项是可选的 看调试信息才需要这样启动Mysql，一般不需要。

Debug Package.  A special variant of MySQL Server compiled with the debug package has been included in the server RPM packages. It performs debugging and memory allocation checks and produces a trace file when the server is running. To use that debug version, start MySQL with /usr/sbin/mysqld-debug, instead of starting it as a service or with /usr/sbin/mysqld. See The DBUG Package for the debug options you can use.

3.3、安装后配置

链接: https://dev.mysql.com/doc/mysql-installation-excerpt/8.0/en/postinstallation.html

使用安装Mysql数据库 时生成的默认密码登录mysql数据库

mysql -uroot -p

没修改默认密码前不能进行数据库sql操作

修改Mysql默认密码为Mysql@123

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Root@123' PASSWORD EXPIRE NEVER;
ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'
mysql> 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)mysql> 
mysql> use mysql
Database changed
mysql> 
mysql> update user set host = "%" where user = "root";
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1  Changed: 0  Warnings: 0mysql> 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)mysql> 
mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'Root@123';
Query OK, 0 rows affected (0.01 sec)mysql> 
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)mysql> 

使用新密码登录mysql数据库