Centos7安装mysql8.0
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如果你已经安装了mysql，需要先卸载，卸载请参考：
Centos7 完全卸载mysql
检查 MariaDB 是否安装
yum list installed|grep mariadb
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卸载全部 MariaDB 相关
yum-yremovemariadb*
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数据准备
下载mysql安装包
[root@localhost~]# cd/usr/local/src/
[root@localhost src]# wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
下载完后可以目录中看到：
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安装mysql源
rpm -ivh mysql80-community-release-el7-3.noarch.rpm
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检查 MySQL 的 YUM 源是否安装成功
yum repolist enabled | grep "mysql.*-community.*"
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查看 MySQL 版本
yum repolist all | grep mysql
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安装 MySQL
yum install mysql-community-server
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启动mysql服务
systemctl start mysqld附加命令查看MySQL状态 systemctl status mysqld关闭MySQL服务 systemctl stop mysqld重启MySQL服务 systemctl restart mysqld
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查看自动生成的临时密码
grep 'temporary password' /var/log/mysqld.log
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这个密码先自己保存下
登录mysql
使用刚才生成的临时密码
mysql -uroot -p
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这时候对数据的操作会报错，必须先改密码
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mysql8.0修改密码和以往不同，我看过别的教程，修改成功后，无法使用该密码进行登录，正确方式如下(引号后面是密码)
密码需要包含大小写字母、数字、符号长度也不能过短，暂时先弄一个很长的，一会再改。
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "#20as3SElk3@wwerwer232342432342343223243sdfasfafasdsds0ew98";
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "#20as3SElk3@wwerwer232342432342343223243sdfasfafasdsds0ew98";
刷新
FLUSH privileges;
此时我们退出，重新登录看看效果
（输入密码我们用复制的，在xshell中操作）
mysql>quit;Bye[root@localhostsrc]# mysql-uroot-pEnter password:Welcome to the MySQL monitor.Commands endwith;or \g.Your MySQL connection idis9Server version:8.0.17MySQL Community Server-GPLCopyright(c)2000,2019,Oracle and/or its affiliates.All rights reserved.Oracleisa registered trademark of Oracle Corporation and/or itsaffiliates.Other names may be trademarks of their respectiveowners.Type'help;'or'\h'forhelp.Type'\c'to clear the current input statement.mysql>
可以登录！
设置安全策略
因为要把刚才的密码改的简单一点，这里需要先修改安全策略，mysql8.0修改安全策略的命令和5.7不同，具体如下
先选择数据库：use mysql;5.7语法：setglobalvalidate_password_policy=0;setglobalvalidate_password_length=1;8.0语法：setglobalvalidate_password.policy=0;setglobalvalidate_password.length=1;最后都要刷新：FLUSHprivileges;
修改密码
mysql>use mysql;Readingtable informationforcompletion of table and column namesYoucan turn offthisfeature togeta quicker startup with-ADatabasechangedmysql>ALTERUSER'root'@'localhost'IDENTIFIEDWITHmysql_native_password BY"123456";QueryOK,0rows affected(0.00sec)mysql>flush privileges;QueryOK,0rows affected(0.00sec)
退出重新登录
输入刚才修改的密码
mysql>quit;Bye[root@localhostsrc]# mysql-uroot-pEnter password:Welcome to the MySQL monitor.Commands endwith;or \g.Your MySQL connection idis11Server version:8.0.17MySQL Community Server-GPLCopyright(c)2000,2019,Oracle and/or its affiliates.All rights reserved.Oracleisa registered trademark of Oracle Corporation and/or itsaffiliates.Other names may be trademarks of their respectiveowners.Type'help;'or'\h'forhelp.Type'\c'to clear the current input statement.mysql>
设置远程访问
mysql> CREATE USER 'root'@'%' IDENTIFIED BY '123456';Query OK, 0 rows affected (2.30 sec)mysql> GRANT ALL ON *.* TO 'root'@'%';Query OK, 0 rows affected (0.01 sec)mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';Query OK, 0 rows affected (0.00 sec)mysql> FLUSH PRIVILEGES; Query OK, 0 rows affected (0.03 sec)mysql>
开启防火墙
[root@localhost src]# firewall-cmd--zone=public--add-port=3306/tcp--permanentsuccess[root@localhost src]# firewall-cmd--reloadsuccess