centos各版本更新yum仓库源图文教程

来说问题先

今天想安装一下jump堡垒机，结果发现安装的时候直接报错，来个图片吧。

开始以为断网，然后接着排查一下。

1、查询本机IP地址，ping内外通讯正常。
2、检查了DNS，安装机器的网络设置和解析也正常
3、防火墙也进行了排查关闭，发现也是正常。

从网络上面诊断没问题，系统也是新的，那么大概率是yum仓库源的问题，开始更换仓库

先去看下原来的仓库

cd /etc/yum.repos.d/
ll
vi CentOS-Base.repo

里面的仓库源没猜错应该是官方的，把它换成阿里的。清华的作为备用

以下内容复制替换掉原来CentOS-Base.repo这个里面所有的。

# CentOS-Base.repo
#
# 这里配置了CentOS的yum源，使用了阿里云和清华大学的镜像点。
#

[base]
name=CentOS-$releasever – Base
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever – Updates
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$releasever – Extras
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever – Plus
baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#contrib – packages by Centos Users
[contrib]
name=CentOS-$releasever – Contrib
baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/
http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

# 使用failovermethod指定优先级，这里设置为随机（roundrobin），也可以改为priority并指定每个URL的优先级
failovermethod=roundrobin

最后清理一下缓存,按顺序依次输入即可。

sudo yum clean all

sudo yum makecache

sudo yum update