這2周做實驗，centos7.x經常出現yum安裝軟件包的時候找不到解析地址，提示如下錯誤

正在嘗試其它鏡像。Error downloading packages: pam-devel-1.1.8-22.el7.x86_64: [Errno 256] No more mirrors to try. libcom_err-1.42.9-12.el7_5.x86_64: [Errno 256] No more mirrors to try. keyutils-libs-devel-1.5.8-3.el7.x86_64: [Errno 256] No more mirrors to try. libverto-devel-0.2.5-4.el7.x86_64: [Errno 256] No more mirrors to try. e2fsprogs-1.42.9-12.el7_5.x86_64: [Errno 256] No more mirrors to try. pcre-devel-8.32-17.el7.x86_64: [Errno 256] No more mirrors to try. krb5-devel-1.15.1-19.el7.x86_64: [Errno 256] No more mirrors to try. libcom_err-devel-1.42.9-12.el7_5.x86_64: [Errno 256] No more mirrors to try. lzo-devel-2.06-8.el7.x86_64: [Errno 256] No more mirrors to try. krb5-libs-1.15.1-19.el7.x86_64: [Errno 256] No more mirrors to try. zlib-devel-1.2.7-17.el7.x86_64: [Errno 256] No more mirrors to try. libsepol-devel-2.5-8.1.el7.x86_64: [Errno 256] No more mirrors to try. ▽libss-1.42.9-12.el7_5.x86_64: [Errno 256] No more mirrors to try. libselinux-devel-2.5-12.el7.x86_64: [Errno 256] No more mirrors to try. 1:openssl-devel-1.0.2k-12.el7.x86_64: [Errno 256] No more mirrors to try. e2fsprogs-libs-1.42.9-12.el7_5.x86_64: [Errno 256] No more mirrors to try. libkadm5-1.15.1-19.el7.x86_64: [Errno 256] No more mirrors to try. lzo-minilzo-2.06-8.el7.x86_64: [Errno 256] No more mirrors to try.

查看 /etc/resolv.conf 中DNS配置，竟然為空，之前明明配置好了的，真是奇怪，難怪不行

[root@opvnserver ~]# cat /etc/resolv.conf # Generated by NetworkManager #<==啥也沒有

百度和Google了一下，NetworkManager與network可能會出現沖突的情況，由于做實驗要添加網卡，重啟服務，于是重新配置好DNS文件

[root@opvnserver ~]# cat /etc/resolv.conf # Generated by NetworkManager nameserver 202.96.128.86 nameserver 202.96.128.166

然后關閉NetworkManager，這樣就不會出現之前的情況了，重新yum安裝軟件也正常了

[root@opvnserver ~]# systemctl stop NetworkManager [root@opvnserver ~]# systemctl disable NetworkManager [root@opvnserver ~]# systemctl restart network

更好的方法：在網卡配置文件中添加DNS地址，格式如下：

[root@opvnserver ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 TYPE=Ethernet BOOTPROTO=static DEFROUTE=yes IPV4_FAILURE_FATAL=no NAME=eth0 DEVICE=eth0 ONBOOT=yes IPADDR=10.0.0.3 GATEWAY=10.0.0.254 NETMASK=255.255.255.0 DNS1=202.96.128.86 DNS2=202.96.128.166

注意：在centos7.x 中，DNS不在 /etc/resolv.conf 中配置了，而是直接在網卡配置文件中配置DNS，這和centos6.x版本有點區別，真是無語，改來改去，呵呵！

　

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轉載于:https://www.cnblogs.com/blog-tim/p/10316176.html

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