su -

# ===================================
# 镜像源设置开始
# ===================================
# 添加中科大centos7镜像源
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak \
    && sed -e 's|^mirrorlist=|#mirrorlist=|g' \
         -e 's|^#baseurl=http://mirror.centos.org/centos|baseurl=https://mirrors.ustc.edu.cn/centos|g' \
         -i.bak \
         /etc/yum.repos.d/CentOS-Base.repo

yum makecache \
    && yum clean all

# 卸载旧版
rpm -qa | grep mysql
sudo rpm -e --nodeps mysql-community-release-el7-5.noarch

# 安装5.7新版
wget http://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm
sudo rpm -Uvh mysql57-community-release-el7-10.noarch.rpm
# 导入key
sudo rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022