CentOS7.3升级到CentOS7.9
1)查看当前centos系统版本和内核版本
[root@centos7-82 ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
2)备份原来的CentOS-Base.repo
[root@centos7-82 ~]# cd /etc/yum.repos.d/
[root@centos7-82 yum.repos.d]# cp CentOS-Base.repo CentOS-Base.repo_bak
3)修改yum源。
要保证更换的yum源地址可以正常访问。如下使用阿里云的yum源http://mirrors.aliyun.com/centos/7.9.2009,要保证手动打开这个地址是有效地址,且镜像yum源内容完整存在。
[base]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.cloud.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
4)执行更新yum
确保下面更新操作没有报错。
[root@centos7-82 yum.repos.d]# yum update -y
5)重启系统
[root@centos7-82 yum.repos.d]# init 6
重启后查看系统版本
[root@centos7-82 yum.repos.d]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)