CentOS 7迁移Anolis OS 8

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