yum使用條件：yum的使用要保證internet網絡連通，和“cat /etc/resolv.conf”文件下存在“nameserver 8.8.8.8”才可正常更新。? yum，是Yellow dog Updater, Modified 的簡稱，是杜克大學為了提高RPM 軟件包安裝性而開發的一種軟件包管理器。 yum 的宗旨是自動化地升級，安裝/移除rpm 包，收集rpm 包的相關信息，檢查依賴性并自動提示用戶解決。自動解決包的倚賴性問題，便于管理大量系統的更新問題。yum 的關鍵之處是要有可靠的repository。以下文件在重啟系統（CentOS） 或 重啟網路服務,修改“cat /etc/sysconfig/network-scripts/ifcfg-enp0s3”文件后： [root@localhost install-files]# service network restart 會導致，“cat /etc/resolv.conf”此文件更新，“nameserver 8.8.8.8”自動刪除。
配置如下（confA1）： [root@localhost install-files]# cat /etc/resolv.conf # Generated by NetworkManager search lan nameserver fd7b:ac2f:6d73::1 nameserver 8.8.8.8 問題1： 如果在配置： [root@localhost install-files]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3 配置：DNS=192.168.10.1
則會導致“cat /etc/resolv.conf”文件異常更新，如下： # Generated by NetworkManager
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com 解決1： 應該注釋：“cat /etc/sysconfig/network-scripts/ifcfg-enp0s3”文件： #DNS=192.168.10.1 然后重啟網路服務生效“service network restart”，
然后，類似以上（confA1）的配置，就可以ok使用。 問題2： One of the configured repositories failed (未知),
?and yum doesn't have enough cached data to continue. At this point the only
?safe thing yum can do is fail. There are a few ways to work "fix" this:
?....
?Cannot find a valid baseurl for repo: base/7/x86_64 解決2：“cat /etc/resolv.conf”文件中增加“nameserver 8.8.8.8”解決。 問題3： [root@localhost log]# yum install telnet
Loaded plugins: fastestmirror
http://mirrors.btte.net/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.btte.net; Unknown error"
Trying other mirror.
http://mirrors.neusoft.edu.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.neusoft.edu.cn; Unknown error"
Trying other mirror.
http://mirrors.hust.edu.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.hust.edu.cn; Unknown error"
Trying other mirror.
http://mirrors.nwsuaf.edu.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.nwsuaf.edu.cn; Unknown error"
Trying other mirror.
http://mirrors.pubyun.com/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.pubyun.com; Unknown error"
Trying other mirror.
http://mirrors.opencas.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.opencas.cn; Unknown error"
Trying other mirror.
http://mirror.neu.edu.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.neu.edu.cn; Unknown error"
Trying other mirror.
http://mirrors.sina.cn/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.sina.cn; Unknown error"
Trying other mirror.
………………………… 解決3：修改好ip能上網：CentOS配置ip[快速配置]

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