第一步，更新mysql源
https://dev.mysql.com/downloads/repo/yum/ 进入这个页面选择下面这个点击下载，进入下载页面得到下载网址。
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wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm
下载下来，然后安装更新源
sudo rpm -Uvh mysql80-community-release-el7-1.noarch.rpm
安装源默认的是mysql8.0, 所以要改一下，改成5.7。
修改安装源默认为mysql5.7
可以用这个命令看看都有哪些源
yum repolist all | grep mysql
下一步，把mysql8.0改成disabled， mysql5.7改成enable。
shell> sudo yum-config-manager --disable mysql80-community
shell> sudo yum-config-manager --enable mysql57-community
yum-config-manager 没安装的话可以下面这种方法：直接打开/etc/yum.repos.d/mysql-community.repo修改, 只改2个地方，8.0的enabled改成0，5.7的enabled改成1。
# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/7/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
保存后就可以安装了.
安装
sudo yum install mysql-community-server
启动Mysql
sudo systemctl start mysqld.service
sudo systemctl status mysqld.service
查看mysql安装时的默认密码
sudo grep 'temporary password' /var/log/mysqld.log
记下密码，登录mysql修改密码
mysql -u root -p
.........
ALTER USER 'root'@'localhost' IDENTIFIED BY 'NewPassword';
安装结束！加下来开启远程连接
1： 防火墙开3306
iptables -I INPUT -s 0/0 -p tcp --dport 3306 -j ACCEPT
- 允许root远程连接
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'YourPassword' WITH GRANT OPTION;
flush privileges;
