hostnamectl set-hostname master
bash

iptables -F
systemctl disable firewalld
systemctl stop firewalld

sed -i '/SELINUX/s/enforcing/disabled/' /etc/sysconfig/selinux
setenforce 0

mkdir /etc/yum.repos.d/bak || true
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak/ || true

curl http://mirrors.aliyun.com/repo/Centos-7.repo -o /etc/yum.repos.d/Centos-Base.repo
sed -i '/aliyuncs.com/d' /etc/yum.repos.d/Centos-Base.repo
# curl http://mirrors.aliyun.com/repo/epel-7.repo -o /etc/yum.repos.d/epel.repo

yum clean all
yum makecache fast
yum install -y wget net-tools vim bash-completion ntpdate
timedatectl set-timezone Asia/Shanghai
ntpdate time.windows.com

yum remove -y $(rpm -qa | grep mariadb)

cat > /etc/yum.repos.d/mysql-community.repo << EOF
[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-connectors-community-el7-\$basearch/
enabled=1
gpgcheck=1
gpgkey=https://repo.mysql.com/RPM-GPG-KEY-mysql

[mysql-tools-community]
name=MySQL Tools Community
baseurl=https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-tools-community-el7-\$basearch/
enabled=1
gpgcheck=1
gpgkey=https://repo.mysql.com/RPM-GPG-KEY-mysql

[mysql-5.7-community]
name=MySQL 5.7 Community Server
baseurl=https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/mysql-5.7-community-el7-\$basearch/
enabled=1
gpgcheck=1
gpgkey=https://repo.mysql.com/RPM-GPG-KEY-mysql
EOF

wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
yum install mysql-community-server

systemctl enable --now mysqld

# grep "password" /var/log/mysqld.log
2023-05-07T02:31:54.375626Z 1 [Note] A temporary password is generated for root@localhost: QZFuIayXk0:l

# 删除原来安装过的mysql残留的数据
rm -rf /var/lib/mysql
# 重启 mysqld 服务, 会重新初始化数据
systemctl restart mysqld
# 再去找临时密码
grep 'temporary password' /var/log/mysqld.log

mysql -uroot -p # 输入默认密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '<pass>'; # 修改密码, 需要有大小写和特殊符号
exit;