文章目录
1. 现场环境2. 报错信息3. 解决方法4. 其他
1. 现场环境
[root@localhost yum.repos.d]# uname -r
3.10.0-862.el7.x86_64
[root@localhost yum.repos.d]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
2. 报错信息
[root@localhost yum.repos.d]# yum -y install lrzsz
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
There are no enabled repos.
Run "yum repolist all" to see the repos you have.
To enable Red Hat Subscription Management repositories:
subscription-manager repos --enable
To enable custom repositories:
yum-config-manager --enable
#查看源状态
[root@localhost yum.repos.d]# yum repolist all
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
源标识 源名称 状态
c7-media CentOS-7 - Media 禁用
repolist: 0
#查看开启的yum源
[root@localhost yum.repos.d]# yum repolist enabled
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
repolist: 0
#查看关闭的yum源
[root@localhost yum.repos.d]# yum repolist disabled
已加载插件：fastestmirror
源标识 源名称
c7-media CentOS-7 - Media
repolist: 0
3. 解决方法
#创建一个新yum源
[root@localhost yum.repos.d]# cat CentOS-Base-163.repo
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - 163.com
baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
[root@localhost yum.repos.d]# yum clean all && yum makecache
#尝试安装。如果出现如下报错
[root@localhost ~]# yum -y install yum
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的错误"
正在尝试其它镜像。
One of the configured repositories failed (CentOS-7 - Base - 163.com),
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=base ...
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 base
or
subscription-manager repos --disable=base
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=base.skip_if_unavailable=true
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的错误"
#将数据写入如下文件
[root@localhost yum.repos.d]# cat /etc/resolv.conf
#nameserver
search localdomain
nameserver 8.8.8.8
[root@localhost yum.repos.d]# yum clean all && yum makecache
4. 其他
#阿里源
wget http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all
yum makecache