Step1 找到需要的源

阿里巴巴開源鏡像站各種源應有盡有，老域名是https://mirrors.aliyun.com/

Step2 編輯CentOS7.repo文件

進入/etc/yum.repos.d，發現我的源還是7.4.1708

[base] name=CentOS-$releasever - Base - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos/7.4.1708/os/x86_64/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7  #released updates [updates] name=CentOS-$releasever - Updates - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos/7.4.1708/updates/x86_64/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7  #additional packages that may be useful [extras] name=CentOS-$releasever - Extras - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos/7.4.1708/extras/x86_64/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7  #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos/7.4.1708/centosplus/x86_64/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7  #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib - mirrors.aliyun.com failovermethod=priority baseurl=http://mirrors.aliyun.com/centos/7.4.1708/contrib/x86_64/ #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

這個版本的源已經遷移到7.5.1804了，→地址，使用VIM將其替換

:%s/7.4.1708/7.7.1908/g

Step3 修復沖突報錯

然后更新系統試試yum -y update

[root@liaogx ~]# yum -y update Plugin "product-id" can't be imported Plugin "search-disabled-repos" can't be imported Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile  * base: mirrors.aliyun.com  * epel: mirrors.tuna.tsinghua.edu.cn  * extras: mirrors.aliyun.com  * updates: mirrors.aliyun.com Resolving Dependencies --> Running transaction check ---> Package ModemManager.x86_64 0:1.6.0-2.el7 will be updated ......此處略...... ---> Package yum-rhn-plugin.noarch 0:2.0.1-10.el7 will be installed --> Running transaction check ---> Package libbytesize.x86_64 0:1.2-1.el7 will be installed ---> Package python2-pytoml.noarch 0:0.1.18-1.el7 will be installed ---> Package volume_key-libs.x86_64 0:0.3.9-8.el7 will be installed --> Processing Conflict: initscripts-9.49.41-1.el7_5.1.x86_64 conflicts redhat-release < 7.5-0.11 --> Finished Dependency Resolution Error: initscripts conflicts with redhat-release-server-7.4-18.el7.x86_64  You could try using --skip-broken to work around the problem ** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows: PackageKit-1.1.5-1.el7.centos.x86_64 has missing requires of PackageKit-backend rhn-check-2.0.2-17.el7.noarch has missing requires of yum-rhn-plugin >= ('0', '1.6.4', '1') [root@liaogx ~]#

如果報如下錯誤

Error: initscripts conflicts with redhat-release-server-7.4-18.el7.x86_64

這是更新軟件包是與原版本沖突造成的，有兩種解決辦法

• 通過關鍵字initscritps排除沖突：yum update --exclude=kernel* --exclude=centos-release* --exclude=initscripts*
• 刪除沖突包：rpm -e redhat-release-server-7.4-18.el7.x86_64 --nodeps

這里使用第二種方法，把沖突的包干掉

[root@liaogx ~]# rpm -e redhat-release-server-7.4-18.el7.x86_64 --nodeps warning: file /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release: remove failed: No such file or directory warning: file /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-legacy-rhx: remove failed: No such file or directory warning: file /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-legacy-release: remove failed: No such file or directory warning: file /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-legacy-former: remove failed: No such file or directory warning: file /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta: remove failed: No such file or directory [root@liaogx ~]#

Step4 更新系統

小白從入門到跑路必會，sudo yum -y update，老鳥都懂。

[root@liaogx ~]# yum -y update ......此處省略10分鐘...... Complete! [root@liaogx ~]#

更新成功 ^_^