CentOS 升级至指定版本
<p>CentOS系统下用yum upgrade命令只能升级到最新版本，CentOS仓库并不维护历史版本，所以只能使用 vault.centos.org 历史版本快照进行更新。<br>本文以将7.0.1406升级到7.2.1511为例。</p><p>1、备份旧的版本仓库文件：</p>
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<pre class="brush:bash;gutter:true;">mkdir -p /etc/yum.repos.d/backup
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/
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<p>2、创建要升级到版本(7.2.1511)的Vault版本仓库文件：</p>
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<pre class="brush:bash;gutter:true;">vim /etc/yum.repos.d/CentOS-Vault.repo
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<pre class="brush:bash;gutter:true;"># CentOS Vault contains rpms from older releases in the CentOS-7
# tree.
# C7.2.1511
name=CentOS-7.2.1511 - Base
baseurl=http://vault.centos.org/7.2.1511/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
name=CentOS-7.2.1511 - Updates
baseurl=http://vault.centos.org/7.2.1511/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
name=CentOS-7.2.1511 - Extras
baseurl=http://vault.centos.org/7.2.1511/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
name=CentOS-7.2.1511 - CentOSPlus
baseurl=http://vault.centos.org/7.2.1511/centosplus/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
name=CentOS-7.2.1511 - Fasttrack
baseurl=http://vault.centos.org/7.2.1511/fasttrack/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1
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<p>3、查看现在可用仓库列表：</p>
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<pre class="brush:bash;gutter:true;"># yum repolist
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<p>4、查看现在可用仓库版本：</p>
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<pre class="brush:bash;gutter:true;"># yum list updates | grep "centos-release"
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<p>5、清空本地缓存：</p>
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<pre class="brush:bash;gutter:true;"># yum clean all
# rm -rf /var/cache/yum
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<p>6、版本升级：</p>
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<pre class="brush:bash;gutter:true;"># yum -y update
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<p>7、备份过渡的Vault仓库文件，启用新版的仓库文件：</p>
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<pre class="brush:bash;gutter:true;"># mv /etc/yum.repos.d/CentOS-Vault.repo /etc/yum.repos.d/backup/
# mv /etc/yum.repos.d/CentOS-Vault.repo.rpmnew /etc/yum.repos.d/CentOS-Vault.repo
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<p>8、清空本地缓存，更新版本库文件：</p>
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<pre class="brush:bash;gutter:true;"># yum clean all
# yum makecache
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来源：https://www.cnblogs.com/configure/p/10918189.html
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