centos7 在线安装mysql

以下是我的腾讯云服务器安装mysql过程，亲测正常可用（新买的服务器之前没有安装过mysql）：

1. 先下载 mysql源安装包

wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

      2.安装mysql源

yum -y localinstall mysql57-community-release-el7-11.noarch.rpm 

    3.在线安装Mysql 

yum -y install mysql-community-server  下载东西很多要等会

安装过程中可能会报错:  (由于MYSQL GPG密匙过期)

Public key for mysql-community-common-5.7.42-1.el7.x86_64.rpm is not installed

 Failing package is: mysql-community-common-5.7.42-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

解决办法 :   rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

然后重新安装 mysql :  yum -y install mysql-community-server

    4.启动Mysql服务

systemctl start mysqld

   5.设置开机启动

systemctl enable mysqld  然后 systemctl daemon-reload

   6.修改root本地登录密码  

vi /var/log/mysqld.log 查看临时密码  复制好

或者用 grep 'temporary password' /var/log/mysqld.log  查看临时密码

mysql -u root -p 然后输入临时密码

mysql>    ALTER USER 'root'@'localhost' IDENTIFIED BY ‘root';

或者：set password for root@localhost = password('root'); 

如果报错

Your password does not satisfy the current policy requirements

则需要以下几行代码：

set global validate_password_policy=0;

set global validate_password_mixed_case_count=0;

set global validate_password_number_count=3;

set global validate_password_special_char_count=0;

set global validate_password_length=3;

     7.设置允许远程登录

mysql> 

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;

Exit 退出mysql

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

firewall-cmd --reload 开放3306端口

     8.配置默认编码为utf8  

vi /etc/my.cnf 

在[mysqld]下添加

character_set_server=utf8mb4

init_connect='SET NAMES utf8mb4'

然后重启服务  systemctl restart mysqld

查看下编码：mysql>   show variables like '%character%';

9、测试 自己用Navicat去连