有关Linux的yum错误

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近日因为电脑重置，又得重新配置自己的虚拟机，好不容易才把各个环境配好，才发现还有虚拟机要配置，接下来看到的就是我在命令模式下出现的状况了，原谅是第一次遇见，只好慢慢查找哪里出错了，如果也是yum命令后显示fastestmirror这样的错误信息，也可以按照以上方法解决。

首先错误显示信息如下：

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[root@localhost ~]# yum install lrzsz
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"

…

第一步：
输入命令

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[root@localhost ~]# vi  /etc/yum/pluginconf.d/

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fastestmirror.conf 
[main]
enabled=1//把1改为0  
verbose=0
always_print_best_host = true
socket_timeout=3
#Relative paths are relative to the cachedir (and so works for users as well
#as root).
hostfilepath=timedhosts.txt
maxhostfileage=10
maxthreads=15
#exclude=.gov, facebook
#include_only=.nl,.de,.uk,.ie

第二步：
输入命令

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[root@localhost ~]# vi /etc/yum.conf

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[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1//将plugins的值修改为0
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=23&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release
#  This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
#  It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# metadata_expire=90m
# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d

继续运行，出现如下错误

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[root@localhost ~]# yum install lrzsz
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Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
 One of the configured repositories failed (Unknown),
 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:
    1. Contact the upstream for the repository and get them to fix the problem.
    2. Reconfigure the baseurl/etc. for the repository, to point to a working
       upstream. This is most often useful if you are using a newer
       distribution release than is supported by the repository (and the
       packages for the previous distribution release still work).
    3. Run the command with the repository temporarily disabled
           yum --disablerepo=<repoid> ...
    4. Disable the repository permanently, so yum won't use it by default. Yum
       will then just ignore the repository until you permanently enable it
       again or use --enablerepo for temporary usage:
           yum-config-manager --disable <repoid>
       or
           subscription-manager repos --disable=<repoid>
    5. Configure the failing repository to be skipped, if it is unavailable.
       Note that yum will try to contact the repo. when it runs most commands,
       so will have to try and fail each time (and thus. yum will be be much
       slower). If it is a very temporary problem though, this is often a nice
       compromise:
           yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
Cannot find a valid baseurl for repo: base/7/x86_64

原因：没有配置resolv.conf
解决方法:
到/etc目录下配置resolv.conf加入nameserver IP,如：
[root@localhost ~]# vi /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
search localdomain
保存再次运行命令就可以
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