1、将centos7系统更新到最新版本
# 更新系统
[root@localhost ~]# yum update -y && yum upgrade -y
# 更新完成后重启
[root@localhost ~]# reboot
# 检查系统版本和内核版本
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@localhost ~]# uname -r
3.10.0-1160.119.1.el7.x86_642、Install Elevate
2.1 安装 Elevate 提升存储库
yum install -y https://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm
2.2 安装 Leapp 和迁移数据
因为 Elevate 在后台使用 Leapp，所以我们需要安装相应的包：
#rockylinux 安装包
yum install -y leapp-upgrade leapp-data-rocky如果您想迁移到其他发行版之一，请将“leapp-data-rocky”包替换为其一：
leapp-data-almalinux
leapp-data-oraclelinux
leapp-data-rocky
3、升级前检查
[root@localhost ~]# leapp preupgrade
......
============================================================
UPGRADE INHIBITED
============================================================
Upgrade has been inhibited due to the following problems:
1. Inhibitor: Use of NFS detected. Upgrade can't proceed
2. Inhibitor: Missing required answers in the answer file
Consult the pre-upgrade report for details and possible remediation.
============================================================
UPGRADE INHIBITED
============================================================
Debug output written to /var/log/leapp/leapp-preupgrade.log
============================================================
REPORT
============================================================
A report has been generated at /var/log/leapp/leapp-report.json
A report has been generated at /var/log/leapp/leapp-report.txt
============================================================
END OF REPORT
============================================================
Answerfile has been generated at /var/log/leapp/answerfile
2.4 查看检查可能的问题并根据推荐的解决方案修复
查看生成的响应文件和报告，内容提到了您需要解决的任何问题。这是我必须做的：
[root@localhost ~]# cat /var/log/leapp/leapp-report.txt
rmmod pata_acpi
echo PermitRootLogin yes | sudo tee -a /etc/ssh/sshd_config
leapp answer --section remove_pam_pkcs11_module_check.confirm=True
# 根据提示，关闭服务，卸载软件
yum remove nfs-utils
#清理所有无用软件包
[root@localhost html]# package-cleanup --leaves
Loaded plugins: fastestmirror
libnfsidmap-0.25-19.el7.x86_64
libsysfs-2.1.0-16.el7.x86_64
# 根据提示，卸载软件
yum remove $(package-cleanup --leaves)
#清理RPM软件包
[root@localhost ~]# package-cleanup --orphans
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
nginx-release-centos-7-0.el7.ngx.noarch
#删除需要清理的包
yum remove $(package-cleanup --orphans)
#清理所有无用软件包
modprobe -r pata_acpi
modprobe -r mptspi
modprobe -r mptscsih
modprobe -r mptbase
#清理旧的内核版本,只保留最新的1个内核版本
package-cleanup --oldkernels --count=14、Upgrade to Rocky Linux 8
解决所有问题后，执行如下命令，将 CentOS 7 迁移到 RockyLinux 8
[root@localhost ~]# leapp upgrade
[root@localhost ~]# reboot
在重新启动过程中，将出现一个标有“Elevate-Upgrade-Initramfs”的新引导选项，如下图：
默认选择第一项，将自动升级系统所有包，同时也会进行软件包的校验。
如果系统所有软件包升级和校验成功后，将会自动重启系统。
自检成功后，会再次自动重启系统。
系统启动成功后，显示如下：
5、登录后，请验证操作系统版本信息
[root@localhost ~]# cat /etc/redhat-release
Rocky Linux release 8.10 (Green Obsidian)
[root@localhost ~]#
[root@localhost ~]# uname -r
4.18.0-553.5.1.el8_10.x86_64