Centos7 升级内核到指定版本

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# 修改版本号即可 [C7.5.1804-base] name=CentOS-7.5.1804 - Base baseurl=http://vault.centos.org/7.5.1804/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 enabled=1 [C7.5.1804-updates] name=CentOS-7.5.1804 - Updates baseurl=http://vault.centos.org/7.5.1804/updates/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 enabled=1 [C7.5.1804-extras] name=CentOS-7.5.1804 - Extras baseurl=http://vault.centos.org/7.5.1804/extras/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 enabled=0 [C7.5.1804-centosplus] name=CentOS-7.5.1804 - CentOSPlus baseurl=http://vault.centos.org/7.5.1804/centosplus/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 enabled=0 [C7.5.1804-fasttrack] name=CentOS-7.5.1804 - CentOSPlus baseurl=http://vault.centos.org/7.5.1804/fasttrack/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 enabled=1