1、 用FinalShell 连接腾讯云服务器（如图）

1-1 FinalShell 的详细用法及软件下载

详细内容见见链接

2、详细过程如下

2-1 先添加规则如下图所示

[root@VM-4-8-centos ~]# cd /usr/local/src/
[root@VM-4-8-centos src]# wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm

[root@VM-4-8-centos src]# rpm -ivh mysql57-community-release-el7-8.noarch.rpm 
警告：mysql57-community-release-el7-8.noarch.rpm: 头V3 DSA/SHA1 Signature, 密钥 ID 5072e1f5: NOKEY
准备中...                          ################################# [100%]
正在升级/安装...

[root@VM-4-8-centos src]# yum -y install mysql-server

 失败的软件包是：mysql-community-client-5.7.39-1.el7.x86_64
 GPG  密钥配置为：file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[root@VM-4-8-centos src]# rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

[root@VM-4-8-centos src]# yum -y install mysql-community-server

[root@VM-4-8-centos src]# systemctl start mysqld.service

[root@VM-4-8-centos src]# grep "password" /var/log/mysqld.log

[root@VM-4-8-centos src]# mysql -u root -p
Enter password: 

mysql> alter user 'root'@'localhost' identified by 'Hh123456';
Query OK, 0 rows affected (0.00 sec)

mysql> create user 'root'@'%' identified by 'Hh123456';
Query OK, 0 rows affected (0.00 sec)

mysql> grant all privileges on *.* to 'root'@'%' with grant option;
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

[root@VM-4-8-centos src]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success

[root@VM-4-8-centos src]# firewall-cmd --list-port
20/tcp 21/tcp 22/tcp 80/tcp 443/tcp 8888/tcp 39000-40000/tcp

[root@VM-4-8-centos src]# firewall-cmd --reload
success

[root@VM-4-8-centos src]# firewall-cmd --list-port
20/tcp 21/tcp 22/tcp 80/tcp 443/tcp 8888/tcp 39000-40000/tcp 3306/tcp
 

3、接下来如图

4、 打开数据库连接客户端

5、如图便是连接上腾讯云的数据库了