错误一：xpmem错误，找不到库

解决办法：重新安装xpmem即可，centos7.9里和rocky8.8不一样导致
yum remove xpmem
dnf install libxpmem

错误二：centos7.9升级到rocky8之后，云服务有四个服务无法启动cloud-config，cloud-final，cloud-init-local，cloud-init。经过分析日志journalctl -xe，发现是python2.7少了相关依赖，手动安装

解决办法：用pip2把依赖装上
pip2 install requests jsonpatch  oauthlib

错误三：loadmodules.service无法启动，查看日志systemctl status loadmodules，报错如下
Condition: start condition failed at Sun 2023-10-01 05:06:04 HKT; 3s ago
├─ ConditionPathExists=|/etc/rc.modules was not met
└─ ConditionDirectoryNotEmpty=|/etc/sysconfig/modules was not met

解决办法：创建个空文件，让服务启动即可。（PS：不启动也没事，没啥大用）
touch /etc/rc.modules
chmod 755 rc.modules

参考文章
Problem on RockyLinux 8.5 after update
https://www.reddit.com/r/RockyLinux/comments/tg5tcl/problem_on_rockylinux_85_after_update/?rdt=38879

Failed services after update
https://forums.rockylinux.org/t/failed-services-after-update/6186

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