基本按着这篇博文来操作的，如下
linux centos7.6 安装mysql5.5.62 详细图文安装学习记录
https://blog.csdn.net/StenisGate/article/details/90740163
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然后是一些其他的操作
为远程连接添加权限跟开放端口：
https://blog.csdn.net/qq_19987491/article/details/86484749
1.查看防火墙是否开启：systemctl status firewalld
2.开启防火墙：systemctl start firewalld.service
如果出现Failed to start firewalld.service: Unit is masked的错误，说明firewalld服务被锁定了
可执行：systemctl unmask firewalld解除锁定
3.查看防火墙监听的端口号：firewall-cmd --list-ports
4.防火墙开启80端口访问：firewall-cmd --zone=public --add-port=80/tcp --permanent 这里面80可以换其他端口号,mysql就是3306
5.重启防火墙：firewall-cmd --reload
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因为添加远程访问后本地登陆密码报错：
grant all privileges on *.* to root@'localhost' identified by '密码';
flush privileges;
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修改mysql默认字符集：
show variables like 'character%'; 查看字符集编码情况
先停掉mysql服务
修改/etc/my.cnf文件
[client]
default_character_set=utf8
[mysqld]
collation_server = utf8_general_ci
character_set_server = utf8