centos7 安装mysql8.0.28

本文主要是介绍centos7 安装mysql8.0.28，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

1.下载rpm文件

https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.28-1.el7.x86_64.rpm-bundle.tar

2.上传到centos7中

 3.解压

tar -xvf mysql-8.0.28-1.el7.x86_64.rpm-bundle.tar -C ./mysql8

　4.进入mysql8文件：

1.安装common
 rpm  -ivh mysql-community-common-8.0.28-1.el7.x86_64.rpm --nodeps --force
2.安装 libs
 rpm -ivh mysql-community-libs-8.0.28-1.el7.x86_64.rpm --nodeps --force
3.安装client
rpm -ivh mysql-community-client-8.0.28-1.el7.x86_64.rpm --nodeps --force
4.安装server
 rpm -ivh mysql-community-server-8.0.28-1.el7.x86_64.rpm --nodeps --force

 5.对安装路径进行授权

chown mysql:mysql /var/lib/mysql -R;
mkdir /var/log/mysql
chown mysql:mysql /var/log/mysql -R;

6.初始化

 mysqld --initialize;

7.启动报错

systemctl start mysqld.service;
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

　错误信息：

2022-06-25T11:53:37.340412Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.28) initializing of server in progress as process 45584
2022-06-25T11:53:37.353199Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2022-06-25T11:53:38.176035Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2022-06-25T11:53:38.789384Z 0 [Warning] [MY-013829] [Server] Missing data directory for ICU regular expressions: /usr/lib64/mysql/private/.
2022-06-25T11:53:39.129896Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: )GK1ta/8=qqh
2022-06-25T11:54:06.619363Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.28) starting as process 45672
2022-06-25T11:54:06.677878Z 0 [Warning] [MY-010075] [Server] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 84256f11-f47d-11ec-8275-0050563fd5e7.
mysqld: File '/var/lib/mysql/auto.cnf' not found (OS errno 13 - Permission denied)
2022-06-25T11:54:06.677969Z 0 [ERROR] [MY-010183] [Server] Failed to create file(file: '/var/lib/mysql/auto.cnf', errno 13)
2022-06-25T11:54:06.677979Z 0 [ERROR] [MY-010076] [Server] Initialization of the server's UUID failed because it could not be read from the auto.cnf file. If this is a new server, the initialization failed because it was not possible to generate a new UUID.
2022-06-25T11:54:06.678018Z 0 [ERROR] [MY-010119] [Server] Aborting
2022-06-25T11:54:06.678408Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.28)  MySQL Community Server - GPL.

解决

chmod -R 777 /var/lib/mysql/auto.cnf 

继续报错：

2022-06-25T12:11:48.382457Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.28) starting as process 46057
2022-06-25T12:11:48.389019Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2022-06-25T12:11:48.389071Z 1 [ERROR] [MY-012271] [InnoDB] The innodb_system data file 'ibdata1' must be writable
2022-06-25T12:11:48.389085Z 1 [ERROR] [MY-012278] [InnoDB] The innodb_system data file 'ibdata1' must be writable
2022-06-25T12:11:48.389106Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2022-06-25T12:11:48.389177Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2022-06-25T12:11:48.389210Z 0 [ERROR] [MY-010119] [Server] Aborting
2022-06-25T12:11:48.389711Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.28)  MySQL Community Server - GPL.

　　应该是没有权限解决办法，重写执行

chown mysql:mysql /var/lib/mysql -R;

启动

 systemctl start mysqld.service; 

检查状态

[root@rocketmq02 mysql8]# systemctl status mysqld.service
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2022-06-25 20:13:31 CST; 1min 12s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 46133 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 46161 (mysqld)
   Status: "Server is operational"
    Tasks: 37
   CGroup: /system.slice/mysqld.service
           └─46161 /usr/sbin/mysqld

Jun 25 20:13:28 rocketmq02 systemd[1]: Starting MySQL Server...
Jun 25 20:13:31 rocketmq02 systemd[1]: Started MySQL Server.

8.修改密码：

找到初始密码：

cat /var/log/mysqld.log | grep password

执行

mysql -u root -p 进行登录

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

报错：

 修改密码限制，先修改一次密码，如下：

否则你会发现，你无法修改，密码的难度的设置

显示当前设置

 修改密码长度：

set global validate_password.length=4;

修改密码等级：

set global validate_password.policy=LOW;

设置chek_name

set global validate_password.check_user_name=OFF;

 再次查看：

 再次修改密码：

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

9.设置远程访问：

create user 'root'@'%' identified with mysql_native_password by 'root';
grant all privileges on *.* to 'root'@'%' with grant option;
 flush privileges;

 10.测试：

 11.防火墙放开

sudo firewall-cmd --zone=public --add-port=3306/tcp --permanent
#重启防火墙
sudo firewall-cmd --reload

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