腾讯云服务器无法使用yum更新的解决方法

腾讯云linux服务器内网安装源的域名解析，依赖于腾讯云服务器配置的内网dns，经常会有用户遇到yum源无法安装的情况，报错提示如下：

Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
ruby-2.0.0.648-36.el7.x86_64.r FAILED
http://mirrors.tencentyun.com/centos/7/os/x86_64/Packages/ruby-2.0.0.648-36.el7.x86_64.rpm: [Errno 14] curl#6 - "Could not resolve host: mirrors.tencentyun.com; Unknown error"ETA
Trying other mirror.
ruby-irb-2.0.0.648-36.el7.noar FAILED
http://mirrors.tencentyun.com/centos/7/os/x86_64/Packages/ruby-irb-2.0.0.648-36.el7.noarch.rpm: [Errno 14] curl#6 - “Could not resolve host: mirrors.tencentyun.com; Unknown error”
Trying other mirror.
ruby-libs-2.0.0.648-36.el7.x86 FAILED
http://mirrors.tencentyun.com/centos/7/os/x86_64/Packages/ruby-libs-2.0.0.648-36.el7.x86_64.rpm: [Errno 14] curl#6 - “Could not resolve host: mirrors.tencentyun.com; Unknown error”
Trying other mirror.
rubygem-bigdecimal-1.2.0-36.el FAILED
http://mirrors.tencentyun.com/centos/7/os/x86_64/Packages/rubygem-bigdecimal-1.2.0-36.el7.x86_64.rpm: [Errno 14] curl#6 - “Could not resolve host: mirrors.tencentyun.com; Unknown error”

我们可以将主机的 DNS 网络服务器修改为腾讯云主机默认的服务器地址即可。终端情况下使用如下命令：

vim /etc/resolv.conf

修改对应的主、次要 DNS 网络服务器 IP 地址，然后保存，重启网络服务即可。

service network restart

注意：腾讯云不同地域的内网 DNS 服务器 IP 地址是不同的，如下表：

• 广州服务器：
  nameserver 10.225.30.181
  nameserver 10.225.30.223
• 北京服务器：
  nameserver 10.53.216.182
  nameserver 10.53.216.198
• 上海服务器：
  nameserver 10.236.158.114
  nameserver 10.236.158.106
• 上海金融服务器：
  nameserver 10.48.46.77
  nameserver 10.48.46.27
• 深圳金融服务器：
  nameserver 100.83.224.91
  nameserver 100.83.224.88
• 香港服务器：
  nameserver 10.243.28.52
  nameserver 10.225.30.178
• 新加坡服务器：
  nameserver 100.78.90.19
  nameserver 100.78.90.8
• 多伦多服务器：
  nameserver 10.116.19.185
  nameserver 10.116.19.188
• 硅谷服务器：
  nameserver 100.102.22.21
  nameserver 100.102.22.30
• 私有网络 VPC：
  nameserver 183.60.83.19
  nameserver 183.60.82.98