这篇文章主要介绍了Centos8安装mysql8的详细过程(免安装版/或者二进制包方式安装),使用二进制包方式安装首先检查服务器上是否安装有mysql然后开始安装配置，本文分步骤给大家讲解的非常详细，需要的朋友可以参考下！

二进制包方式安装

一、首先检查服务器上是否安装有mysql：

第一步：查看mysql安装版本rpm -qa|grep -i mysql

第二步：卸载Mysqlrpm -ev –nodeps 【上一步查询到的mysql版本名称】

最后删除关于mysql相关的文件夹：查找根目录下所有者是mysql和有mysql名称的文件find / -user mysqlfind / -name mysql把查找出的目录文件删除：rm -rf 路径

二、开始安装配置mysql

mysql-8.0.30-linux-glibc2.12-x86_64.tar.xz

网址：MySQL :: Download MySQL Community Server (Archived Versions)

上传到服务器上，解压，然后改名，copy到想要的安装目录（/usr/local/）

目录计划：

安装目录：/usr/local/mysql

data 目录：/data/mysql/data/

日志位置：/data/mysql/mysql_error.err

xz -d  tar xvf mysql-8.0.30-linux-glibc2.12-x86_64.tar.xz
tar xvf mysql-8.0.30-linux-glibc2.12-x86_64.tar
mv mysql-8.0.30-linux-glibc2.12-x86_64 mysql
mv mysql /usr/local/

创建mysql用户和用户组

groupadd mysql
useradd -r -g mysql -s /bin/false mysql

将安装目录所有者及所属组改为mysql ，并创建相关文件夹

cd /usr/local/
chown -R mysql:mysql /usr/local/mysql/
ll
mkdir -p /data/mysql/{data,backup,scripts,binlog}
ll /data/mysql/
chown -R mysql:mysql /data/mysql/

添加环境变量，并修改my.cnf配置文件

echo "export PATH=$PATH:/usr/local/mysql/bin"  >>  /etc/profile
source /etc/profile
vi /etc/my.cnf
[mysqld]
user=mysql
port=3306
#basedir=/data/mysql
datadir = /data/mysql/data/
default_authentication_plugin=mysql_native_password
log_error=/data/mysql/mysql_error.err
max_connections=10000
max_connect_errors=10
character-set-server=utf8mb4
default-storage-engine=INNODB
default_authentication_plugin=mysql_native_password
[mysql]
default-character-set=utf8mb4

初始化mysql数据库

mysqld --initialize --user=mysql

/data/mysql/mysql_error.err里记录了 mysql初始密码

将mysql加入到服务，并设置开机自启，启动mysql

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
chkconfig mysqld on
systemctl start mysqld 

连接mysql

遇到报错

[root@localhost mysql]# mysql -uroot -p
mysql: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory

解决方案：

[root@localhost mysql]# sudo ln -s /usr/lib64/libtinfo.so.6.1 /usr/lib64/libtinfo.so.5

再次连接SQL

[root@localhost mysql]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.30

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.
# 修改初始密码
mysql> alter user root@localhost identified by '111111';
Query OK, 0 rows affected (0.00 sec)

mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed#设置远程连接
mysql> update user set host='%' where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0
# 刷新权限
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
# 赋权限
mysql> grant all privileges on *.* to 'root'@'%' with grant option;
Query OK, 0 rows affected (0.00 sec)#刷新权限
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql> quit

#刷新权限

systemctl restart mysql
or
service mysql restart

重启服务且测试

systemctl restart mysqlorservice mysql restart

查看防火墙开放端口

firewall-cmd –list-all

在防火墙中将3306端口开放

firewall-cmd –zone=public –add-port=3306/tcp –permanent

firewall-cmd –reload

//–permanent为永久生效，没有此参数 服务器重启后配置失效

在Navicat上测试连接

重启linux后测试自启动（可选）　　reboot

测试mysql服务是否自启动

systemctl status mysql