centos7升级到rocky linux8

一、更新现有centos7系统

[root@bogon ~]# yum update -y
[root@bogon ~]# yum upgrade -y

二、安装Elevate

[root@bogon ~]# yum install -y https://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm
[root@bogon ~]# rpm -qa|grep elevate
elevate-release-1.0-1.el7.noarch
[root@bogon ~]# 

三、安装leapp和leapp-data

[root@bogon ~]# yum install -y leapp-upgrade leapp-data-rocky
[root@bogon ~]# rpm -qa|grep leapp
leapp-upgrade-el7toel8-0.16.0-6.el7.elevate.1.noarch
python2-leapp-0.14.0-1.el7.noarch
leapp-0.14.0-1.el7.noarch
leapp-data-rocky-0.1-6.el7.noarch
leapp-deps-0.14.0-1.el7.noarch
leapp-upgrade-el7toel8-deps-0.16.0-6.el7.elevate.1.noarch

四、开始预升级

[root@bogon ~]# leapp preupgrade 
============================================================
                     UPGRADE INHIBITED                      
============================================================

Upgrade has been inhibited due to the following problems:
    1. Inhibitor: Newest installed kernel not in use
    2. Inhibitor: Use of NFS detected. Upgrade can't proceed
    3. Inhibitor: Possible problems with remote login using root account
    4. 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                        
============================================================

查看具体需要修复的信息

[root@bogon ~]# vim /var/log/leapp/leapp-report.txt 

根据提示信息，进行修复

[root@bogon ~]# rpm -e nfs-utils-1.3.0-0.68.el7.2.x86_64 --nodeps
[root@bogon ~]# leapp answer --section  remove_pam_pkcs11_module_check.confirm=True
[root@bogon ~]# sed -i "s/#PermitRootLogin yes/PermitRootLogin yes/g" /etc/ssh/sshd_config

重启服务器reboot后，再次运行预升级

[root@bogon ~]# leapp preupgrade
Total size: 720 M
Total download size: 609 M
Downloading Packages:
Check completed.
====> * local_repos_inhibit
        Inhibits the upgrade if local repositories were found.
====> * tmp_actor_to_satisfy_sanity_checks
        The actor does NOTHING but satisfy static sanity checks
====> * report_set_target_release
        Reports information related to the release set in the subscription-manager after the upgrade.
====> * check_initramfs_tasks
        Inhibit the upgrade if conflicting "initramfs" tasks are detected
==> Processing phase `Reports`
====> * verify_check_results
        Check all dialogs and notify that user needs to make some choices.
====> * verify_check_results
        Check all generated results messages and notify user about them.

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                        
============================================================

没有提示需要修复的问题，可以升级了