CentOS7切换到阿里yum源_qianwentts-优快云博客

第一步：彻底清理YUM配置

# 备份并清空原有源配置
sudo mv /etc/yum.repos.d/* /tmp/
# 下载阿里云Base源和EPEL源
sudo curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
sudo curl -o /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo
# 强制重建缓存
sudo yum clean all && sudo yum makecache

第二步：修复网络层

# 检查网卡配置（ens33为常见网卡名）
sudo vi /etc/sysconfig/network-scripts/ifcfg-ens33
# 确认修改：ONBOOT=yes
sudo systemctl restart network

# 强制刷新DNS解析
sudo bash -c 'echo "nameserver 114.114.114.114" > /etc/resolv.conf'
sudo bash -c 'echo "nameserver 8.8.8.8" >> /etc/resolv.conf'
sudo chattr +i /etc/resolv.conf  # 防止配置被覆盖

第三步：关闭安全限制

# 临时禁用SELinux
sudo setenforce 0
# 永久关闭（需重启）
sudo sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

# 停用防火墙
sudo systemctl stop firewalld
sudo systemctl disable firewalld

第四步：终极验证

# 测试域名解析
nslookup mirrors.aliyun.com
# 测试HTTP访问
curl -I http://mirrors.aliyun.com
# 完整更新测试
sudo yum update -y