昨天晚上红帽发布了一个新的内核漏洞,漏洞详情如下:
https://access.redhat.com/security/vulnerabilities/tcpsack
影响范围极大,必须立刻修复,对于Centos7而言内核版本在3.10.0-957.21.2及以下的统统中招,但是到现在也没有官方推送的新版本3.10.0-957.21.3内核可用,时不我与时不我待,直接整5.11先用着,等待修复了再切换回去。
现在Centos 7 默认的最新内核版本号是3.10.0-957.21.2.el7.x86_64,这对于企业来说已经够用了,但是对于个人用户或者要体验新东西的极客们而言,版本实在是太低了,所以这里就来记录一下如何利用yum安装法把服务器内核升级为高版本。
1、卸载多余的内核,只保留3.10.0-957.21.2.el7.x86_64
# rpm -qa | grep kernel # 查看现在安装的内核
然后用 yum remove 将多余的kernel-devel kernel-headers kernel-tools-libs-devel kernel-tools kernel-tools-libs等全部卸载
2、安装keys
# rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
3、安装yum源站
# yum install https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
4、安装kernel-ml
# yum –enablerepo=elrepo-kernel install kernel-ml* perf python-perf -y
将会安装下列rpm包
kernel-ml
kernel-ml-headers
kernel-ml-devel
kernel-ml-doc
kernel-ml-tools
kernel-ml-tools-libs
kernel-ml-tools-libs-devel
perf
python-perf
5、切换内核
# grub2-set-default 0
6、重启服务器
# init 6
7、查看内核版本
# uname -r
5.1.11-1.el7.elrepo.x86_64
这样,服务器就完成了升级到最新的内核
如果以后要更新内核,执行下面的命令即可:
# yum –enablerepo=elrepo-kernel update kernel-ml* perf python-perf
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