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CentOS7.x升级至RockyLinux8.x


默认CentOS7.x是无法直接升级到8.x任何版本的,为了解决CentOS7.x升级到8.x版本的问题,AlmaLinux推出了一个名为ELevate项目来帮助用户从7.x版本升级到8.x。

ELevate支持的操作系统有:AlmaLinux8、CentOS8、EuroLinux8、Oracle Linux8、Rocky Linux8。

项目官方网址:https://almalinux.org/elevate/

github开源地址:https://github.com/AlmaLinux/leapp-repository/tree/almalinux

请注意升级前一定要做好数据备份,避免某种原因导致升级失败!!!

CentOS7.x升级至RockyLinux8.x开始

1、更新当前CentOS7.x版本为最新

yum update

2、更新完成后重启

reboot

3、安装elevate库

yum install -y http://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm

4、安装leapp包以及升级包

在文章开始介绍了ELevate支持5个7.x至8.x版本的系统升级,所以这里你要先确定要升级的8.x版本是哪一个,然后安装对应的升级包。

我这里是从7.x升级到rocky8.x,所以需要安装leapp-data-rocky包

yum install leapp-upgrade leapp-data-rocky -y

注:如果你是要升级到其他8.x版本则需要安装其他的包,总之想要升级到哪个版本就安装哪个

leapp-upgrade leapp-data-almalinux
leapp-upgrade leapp-data-centos
leapp-upgrade leapp-data-eurolinux
leapp-upgrade leapp-data-oraclelinux

5、升级前检查

执行升级前检查命令,Leapp会创建一个/var/log/leapp/leapp-report.txt文件,这个文件会包含可能出现的问题以及推荐的解决方案,在检查阶段,不会安装任何rpm包组。

注:如果你当前不允许root登录,则需要执行以下命令,放通root

sed -i 's/#PermitRootLogin yes/PermitRootLogin yes/g' /etc/ssh/sshd_config

执行升级前检查命令

leapp preupgrade

============================================================
                     UPGRADE INHIBITED                      
============================================================
 
Upgrade has been inhibited due to the following problems:
    1. Inhibitor: A YUM/DNF repository defined multiple times
    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                        
============================================================

解决检查出现的问题:

问题一:因为我这里安装了内网的yum源,和默认的源冲突了,所以我需要把冲突的源解决掉,如果你没有改动过yum源的话,一般也不会出现yum源的报错。

问题二:查看log

cat /var/log/leapp/leapp-report.txt

可以看到需要你执行这个命令

leapp answer --section remove_pam_pkcs11_module_check.confirm=True

问题解决完成后,再次执行升级前检查命令,确保检查升级通过

leapp preupgrade

看到以下内容,即表示检查通过

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

6、开始升级

leapp upgrade


A reboot is required to continue. Please reboot your system.
 
 
Debug output written to /var/log/leapp/leapp-upgrade.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                        

7、根据上面提示,重启系统

reboot

重启后可以看到,系统还在进行升级操作

升级完成后,还会自动重启,二次自动重启完成后就是最新的Rocky8系统了

8、查看升级后的系统版本

cat /etc/os-release

NAME="Rocky Linux"
VERSION="8.7 (Green Obsidian)"
ID="rocky"
ID_LIKE="rhel centos fedora"
VERSION_ID="8.7"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Rocky Linux 8.7 (Green Obsidian)"
ANSI_COLOR="0;32"
LOGO="fedora-logo-icon"
CPE_NAME="cpe:/o:rocky:rocky:8:GA"
HOME_URL="https://rockylinux.org/"
BUG_REPORT_URL="https://bugs.rockylinux.org/"
ROCKY_SUPPORT_PRODUCT="Rocky-Linux-8"
ROCKY_SUPPORT_PRODUCT_VERSION="8.7"
REDHAT_SUPPORT_PRODUCT="Rocky Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="8.7"

至此升级完成

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