详解CentOS7更新YUM源步骤-CentOS

Step1 找到需要的源

阿里巴巴开源镜像站各种源应有尽有，老域名是https://mirrors.aliyun.com/

Step2 编辑CentOS7.repo文件

进入/etc/yum.repos.d，发现我的源还是7.4.1708

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

这个版本的源已经迁移到7.5.1804了，→地址，使用VIM将其替换

:%s/7.4.1708/7.7.1908/g

Step3 修复冲突报错

然后更新系统试试yum -y update

[root@liaogx ~]# yum -y updatePlugin "product-id" can't be importedPlugin "search-disabled-repos" can't be importedLoaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * base: mirrors.aliyun.com * epel: mirrors.tuna.tsinghua.edu.cn * extras: mirrors.aliyun.com * updates: mirrors.aliyun.comResolving Dependencies--> Running transaction check---> Package ModemManager.x86_64 0:1.6.0-2.el7 will be updated......此处略......---> 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 ResolutionError: 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-backendrhn-check-2.0.2-17.el7.noarch has missing requires of yum-rhn-plugin >= ('0', '1.6.4', '1')[root@liaogx ~]#

如果报如下错误

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

这是更新软件包是与原版本冲突造成的，有两种解决办法

• 通过关键字initscritps排除冲突：yum update --exclude=kernel* --exclude=centos-release* --exclude=initscripts*
• 删除冲突包：rpm -e redhat-release-server-7.4-18.el7.x86_64 --nodeps

这里使用第二种方法，把冲突的包干掉

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

Step4 更新系统

小白从入门到跑路必会，sudo yum -y update，老鸟都懂。

[root@liaogx ~]# yum -y update......此处省略10分钟......Complete![root@liaogx ~]#

更新成功 ^_^