【linux】centos yum 换源

一、问题描述

CentOS 7 更换yum源后，无法正常使用，报错信息如下：

[root@host-10-43-1-3 ~]# yum install tmux
Loaded plugins: fastestmirror, langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Loading mirror speeds from cached hostfile
epel/x86_64/metalink                                                                                   |  15 kB  00:00:00     * base: mirrors.aliyun.com* epel: mirrors.tuna.tsinghua.edu.cn* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
base                                                                                                   | 3.6 kB  00:00:00     
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 12] Timeout on https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
Trying other mirror.
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 12] Timeout on https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')
Trying other mirror.

二、解决方案

1、删除yum配置中的原先依赖库

sudo rm -rf /etc/yum.repos.d/*

2、下载163源

sudo wget -qO- http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
sudo wget -qO- http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
sudo wget -qO- http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm
sudo wget -qO- http://mirrors.163.com/centos/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

3、依次安装

rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-168.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

4、进入配置文件夹

cd /etc/yum.repos.d

5、 下载最新依赖

sudo wget http://mirrors.163.com/.help/CentOS7-Base-163.repo

6、修改配置项

vim CentOS7-Base-163.repo

7、更换 $releasever 为centos版本号

我这里的centos版本号是7.9.2009

# 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-7.9.2009 - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=7.9.2009&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#released updates
[updates]
name=CentOS-7.9.2009 - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=7.9.2009&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additional packages that may be useful
[extras]
name=CentOS-7.9.2009 - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=7.9.2009&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/7.9.2009/extras/$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-7.9.2009 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/7.9.2009/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

8、 清理yum缓存的各个部分

yum clean all

9、重新生成yum新缓存，完成换源

yum makecache

Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors
base                                   | 3.6 kB     00:00     
extras                                 | 2.9 kB     00:00     
updates                                | 2.9 kB     00:00     
(1/10): base/7/x86_64/group_gz           | 153 kB   00:01     
(2/10): base/7/x86_64/primary_db         | 6.1 MB   01:24     
(3/10): extras/7/x86_64/filelists_db     | 305 kB   00:03     
(4/10): extras/7/x86_64/other_db         | 154 kB   00:00     
(5/10): extras/7/x86_64/primary_db       | 253 kB   00:04     
(6/10): base/7/x86_64/filelists_db       | 7.2 MB   01:41     
(7/10): base/7/x86_64/other_db           | 2.6 MB   00:27     
(8/10): updates/7/x86_64/filelists_db    |  15 MB   03:24     
(9/10): updates/7/x86_64/other_db        | 1.6 MB   00:15     
(10/10): updates/7/x86_64/primary_db     |  27 MB   06:03     
Metadata Cache Created

10、尝试下载新的工具包 

yum install tmux

Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package tmux.x86_64 0:1.8-4.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved==============================================================Package     Arch          Version          Repository   Size
==============================================================
Installing:tmux        x86_64        1.8-4.el7        base        243 kTransaction Summary
==============================================================
Install  1 PackageTotal download size: 243 k
Installed size: 558 k
Is this ok [y/d/N]: y
Downloading packages:
tmux-1.8-4.el7.x86_64.rpm                | 243 kB   00:03     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.Installing : tmux-1.8-4.el7.x86_64                      1/1 Verifying  : tmux-1.8-4.el7.x86_64                      1/1 Installed:tmux.x86_64 0:1.8-4.el7                                     Complete!

搞定！

附加：

centos7 卸载docker

yum remove docker docker-common docker-selinux docker-engine

centos7 安装docker

yum install docker