先看有沒有安裝wget wget -V 如果沒有執行 yum -y install wget 進行安裝
然后進行配置的備份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
然后執行(這個是centos7的配置安裝)
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
然后執行
yum clean all
yum makecache
yum update 或者 yum -y upgrade
yum需要安裝需要的軟件包， yum-util 提供yum-config-manager功能，另外兩個是devicemapper驅動依賴的
yum install -y yum-utils device-mapper-persistent-data lvm2
更換yum源:
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo (使用這個安裝docker更快)
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
查看特定版本 yum list docker-ce --showduplicates | sort -r
yum -y update
升級所有包，改變軟件設置和系統設置,系統版本內核都升級
yum -y upgrade
升級所有包，不改變軟件設置和系統設置，系統版本升級，內核不改變
創建多個數據源
方法二： 手動修改文件 1、進入源目錄： cd /etc/yum.repos.d 2、添加多個源文件，如：shlug.repo，ustc.repo，兩個源的內容如下： （可以創建獨立的repo文件，也可以把以下的內容加到/etc/yum.repos.d/CentOS-Base.repo 后面） [shlug.repo] #mirrors-shlug-org.repo # # rpm --import http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 # # This file uses a new mirrorlist system developed by Lance Davis for CentOS. # 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=mirrors-shlug-org--CentOS-$releasever - Base baseurl=http://mirrors.shlug.org/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 #released updates [update] name=mirrors-shlug-org--CentOS-$releasever - Updates baseurl=http://mirrors.shlug.org/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 #packages used/produced in the build but not released #[addons] 網站上的源目錄沒有addon，故注釋掉 #baseurl=http://mirrors.shlug.org/centos/$releasever/addons/$basearch/ #gpgcheck=1 #gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=mirrors-shlug-org--CentOS-$releasever - Extras baseurl=http://mirrors.shlug.org/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=mirrors-shlug-org--CentOS-$releasever - Plus baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/ gpgcheck=1 gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=mirrors-shlug-org--CentOS-$releasever - Contrib baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 [ustc.repo] # CentOS-Base.repo # # This file uses a new mirrorlist system developed by Lance Davis for CentOS. # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-$releasever - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates baseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #packages used/produced in the build but not released #[addons] 網站上的源目錄沒有addon，故注釋掉 #name=CentOS-$releasever - Addons #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons #baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/ #gpgcheck=1 #gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras baseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 3、導入KEY rpm --import http://mirrors.shlug.org/centos/RPM-GPG-KEY-CentOS-6 rpm --import http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-6 4、安裝自動源選擇插件--自動選擇最快的源 yum install yum-fastestmirror -y 5、如何確認正在使用的是哪個源？ cd /var/cache/yum cat timedhosts.txt