摘要：此處省略分鐘更新成功程序員交流群，干貨分享，加我拉你入群。，邊敲代碼邊學習。

國內小伙伴推薦使用阿里云的源

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

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/7.4.1708/7.5.1804/g

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 ~]#

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 ^_^

程序員交流群，干貨分享，加我拉你入群。，邊敲代碼邊學習。