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背景：生产环境客户要求操作系统国产化
操作系统：Centos7.9
内核：5.4.108

服务器可以联网，进行在线迁移：
# 下载迁移工具软件源
wget https://mirrors.openanolis.cn/anolis/migration/anolis-migration.repo -O /etc/yum.repos.d/anolis-migration.repo# 安装迁移工具
yum install -y python-pip
yum remove -y python-requests python-urllib3; /usr/bin/pip2 uninstall requests urllib3 -y 2>/dev/null || echo "not installed"
yum -y install leapp# 迁移前评估
leapp preupgrade --no-rhsm
上述命令是默认评估迁移到带 ANCK 内核的龙蜥OS，如果你想评估迁移到带 RHCK 内核的龙蜥OS请执行下面的命令：
leapp preupgrade --no-rhsm --disablerepo=anolis_plus# 查看评估报告
cat /var/log/leapp/leapp-report.txt备注：
迁移评估报告中一旦遇到影响到就地迁移的因素，会禁止做迁移实施，将这些影响因素都解决后才能够继续实施迁移常见影响到就地迁移的因素：
Upgrade has been inhibited due to the following problems:
1.  Inhibitor: Not enough space on /boot									#将boot目录下多不用的文件移动至opt下
2.  Inhibitor: Newest installed kernel not in use							#切换到3.10.0的内核
3.  Inhibitor: Possible problems with remote login using root account		#sed -i 's/#PermitRootLogin yes/PermitRootLogin yes/' /etc/ssh/sshd_config#echo PermitRootLogin yes | tee -a /etc/ssh/sshd_config
4.	Inhibitor: Newest installed kernel not in use							#https://www.yuque.com/anolis-docs/kbase/wo6msd
5.	Inhibitor: TCP Wrappers configuration affects some installed packages	#https://www.yuque.com/anolis-docs/kbase/vgxd1i3izs51vbcq
Consult the pre-upgrade report for details and possible remediation.# 开始迁移
leapp upgrade --no-rhsm
上述命令是默认迁移到带 ANCK 内核的龙蜥OS，如果你想迁移到带 RHCK 内核的龙蜥OS请执行下面的命令
leapp upgrade --no-rhsm --disablerepo=anolis_plus
上述命令执行成功后，还可以通过/var/log/leapp/leapp-report.txt查看迁移报告迁移完成后reboot，重启时间过长请耐心等待！# 验证
cat /etc/os-release	# 查看当前操作系统
uname -r			# 查看内核版本

常见问题总结：
1、安装 python-pip 失败
yum install -y python-pip
Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors* base: mirror.nyist.edu.cn* extras: mirrors.bfsu.edu.cn* updates: mirror.nyist.edu.cn
base                                                                                                                       | 3.6 kB  00:00:00
extras                                                                                                                     | 2.9 kB  00:00:00
updates                                                                                                                    | 2.9 kB  00:00:00
(1/2): extras/7/x86_64/primary_db                                                                                          | 250 kB  00:00:00
(2/2): updates/7/x86_64/primary_db                                                                                         |  22 MB  00:00:01
No package python-pip available.
Error: Nothing to do
解决：
# 安装epel-release，该软件包会自动配置yum的软件仓库
yum -y install epel-release
# 再次安装
yum -y install python-pip

此文档根据龙蜥社区相关文档总结
相关链接：
1、https://openanolis.cn/sig/migration/doc/447499505912234337?preview=true&no=328402126342047346
2、https://help.aliyun.com/document_detail/2391249.html?spm=a2c4g.2391250.0.0.6c713037jx2TlH
3、https://www.yuque.com/anolis-docs/kbase/be1rmzsg2cscq6ia