rpm手动安装mysql_CentOS 如何用rpm安装MySQL8
环境：CentOS 6 64位操作系统
因为服务器不连公网，我是选择的rpm安装，安装文件如上图 mysql-8.0.13-1.el6.x86_64.rpm-bundle.tar
1：如果有MySQL先卸载，没有则忽略，卸载前记得备份数据。CentOS 如何完全卸载 MySQL
2：解压之后会有7个rpm包tar -xvf mysql-8.0.13-1.el6.x86_64.rpm-bundle.tar
3：创建 mysql 用户useradd mysql
passwd mysql
4：安装 按顺序执行以下命令rpm -ivh mysql-community-common-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-compat-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-client-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-server-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-test-8.0.13-1.el6.x86_64.rpm
我执行 rpm -ivh mysql-community-server-8.0.13-1.el6.x86_64.rpm 命令时，遇到了失败。
则使用 rpm -ivh mysql-community-server-8.0.13-1.el6.x86_64.rpm --force --nodeps (--force:强制安装， --nodeps:不检查依赖关系)
rpm安装执行成功显示：warning: mysql-community-libs-compat-8.0.13-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ########################################### [100%]
1:mysql-community-libs-co########################################### [100%]
rpm安装执行失败显示：用 rpm -e 先卸载此包在安装warning: mysql-community-libs-compat-8.0.13-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ########################################### [100%]
file /usr/lib64/mysql/libmysqlclient.so.16.0.0 from install of mysql-community-libs-compat-8.0.13-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-8.0.1.el6_8.x86_64
file /usr/lib64/mysql/libmysqlclient_r.so.16.0.0 from install of mysql-community-libs-compat-8.0.13-1.el6.x86_64 conflicts with file from package mysql-libs-5.1.73-8.0.1.el6_8.x86_64
5：安装完成后执行 mysql -v 有显示版本为8.0.13就代表成功了启动： /etc/init.d/mysqld start
停止： /etc/init.d/mysqld stop
重启： /etc/init.d/mysqld restart
默认datadir：/var/lib/mysql/
配置文件：/etc/my.cnf
7：PHP运行连接的时候字符集报错，MySQL8的默认字符集是utf8mb4， 修改配置文件，重启mysql[mysqld]
character-set-server = utf8
[mysql]
default-character-set=utf8
[client]
default-character-set=utf8
8：再次连接还是报错The server requested authentication method unknown to the client
发生这种错误，是由于 MySQL 8 默认使用了新的密码验证插件：caching_sha2_password，而之前的 PHP 版本中所带的 mysqlnd 无法支持这种验证。
解决方法：打开 /etc/my.cnf 此行，重启mysql# default-authentication-plugin=mysql_native_password
9：连接成功