CentOS 7 升级 Rocky Linux 9
CentOS 7 生命周期在2024年6月30日结束，官方不再为 CentOS7 提供任何的技术支持和软件更新服务。
常见 RHEL 系列的操作系统有：
- Red Hat Enterprise Linux（RHEL）
- CentOS
- CentOS Stream
- Rocky Linux
- AlmaLinux
几者的关系：
- rpm 包通用。
- 命令通用。
- CentOS 是 CentOS 社区重新编译 Red Hat 源代码生成的免费版本。
- CentOS Stream 是 CentOS 滚动升级的版本，由 CentOS 官方提供。
- Rocky Linux 和 AlmaLinux 都是基于 RHEL 源代码和二进制文件的克隆版本。
AlmaLinux 官网有一张对比表：
| Benchmarking against RHEL | AlmaLinux | Oracle Linux | Rocky Linux | CentOS Stream | CentOS Linux |
|---|---|---|---|---|---|
| Production Version | Since March 2021 | Since 2006 | Since June 2021 | Since 2019 | Since 2004 |
| RHEL compatibility | Binary Compatible | ABI Compatible? | Binary compatible | Compatible within the limits of the ACG | Binary Compatible |
| Regular updates delay | About 1 business day | About 1 business day | About 1 business day | Upstream of RHEL | About 1 business day |
| Last minor version release delay | 1 day | 7 days | 5 days | N/A | N/A |
| Errata | Yes | Yes | Yes | No | No |
| Lifecycle | 10 Years | 10 Years | 10 Years | 5-6 Years | EOL on 2021-12-31 |
| Commercial support | 3rd party | Oracle, 3rd parties | 3rd Party | 3rd party | 3rd party |
| Livepatching service | KernelCare | Oracle Ksplice, KernelCare Available | KernelCare Available | Not available | KernelCare, Kpatch |
| FIPS compliance | Yes | Yes | Planned | Not available | Not available |
| ARM support | Yes | Yes | Yes | Yes | Yes |
| IBM PowerPC support | Yes | No | Yes (versions ≥ 9) | Yes | Yes |
| IBM Z (s390x) support | Yes | No | Yes (versions ≥ 9) | No | No |
| SecureBoot | Yes | Yes | Yes | Yes | Yes |
| Owned By: | AlmaLinux OS Foundation | Oracle Inc | Rocky Enterprise Software Foundation | Red Hat Inc | Red Hat Inc |
| Owned by org type: | Non-Profit 501(c)6 | For Profit C-Corp | For Profit, Public Benefit Corp | For Profit C-Corp | For Profit C-Corp |