pingcap · ti-chi-bot · Dec 20, 2024 · Dec 20, 2024 · Dec 20, 2024 · Dec 20, 2024
diff --git a/hardware-and-software-requirements.md b/hardware-and-software-requirements.md
@@ -88,14 +88,23 @@ As an open-source distributed SQL database with high performance, TiDB can be de
 </tbody>
 </table>
 
+> **Warning:**
+>
+> - According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on CentOS 7 to v8.4.0 or later will cause the cluster to become unavailable. Before upgrading TiDB, make sure to check your operating system version.
+> - According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable. Before upgrading TiDB, make sure to check your operating system version.
+> - If you are using the 32-bit version of an operating system listed in the preceding table, TiDB **is not guaranteed** to be compilable, buildable or deployable on the 32-bit operating system and the corresponding CPU architecture, or TiDB does not actively adapt to the 32-bit operating system.
+> - Other operating system versions not mentioned above might work but are not officially supported.
+
 > **Note:**
 >
 > - For Oracle Enterprise Linux, TiDB supports the Red Hat Compatible Kernel (RHCK) and does not support the Unbreakable Enterprise Kernel provided by Oracle Enterprise Linux.
+<<<<<<< HEAD
 > - According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. While the upstream support for CentOS Linux 8 ends on December 31, 2021, CentOS Stream 8 continues to be supported by the CentOS organization.
 > - According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. 
+=======
+> - While the upstream support for CentOS Linux 8 ends on December 31, 2021, CentOS Stream 8 continues to be supported by the CentOS organization.
+>>>>>>> 81d6c8497c (add warnings for CentOS 7 usage (#19752) (#19753))
 > - Support for Ubuntu 16.04 will be removed in future versions of TiDB. Upgrading to Ubuntu 18.04 or later is strongly recommended.
-> - If you are using the 32-bit version of an operating system listed in the preceding table, TiDB **is not guaranteed** to be compilable, buildable or deployable on the 32-bit operating system and the corresponding CPU architecture, or TiDB does not actively adapt to the 32-bit operating system.
-> - Other operating system versions not mentioned above might work but are not officially supported.
 > - Starting from v8.4.0, TiDB requires glibc 2.28. If your glibc version does not meet this requirement, it is recommended to use an operating system listed in the preceding table or upgrade the operating system to a version that supports glibc 2.28.
 
 ### Libraries required for compiling and running TiDB

diff --git a/releases/release-8.4.0.md b/releases/release-8.4.0.md
@@ -338,10 +338,10 @@ Starting from v8.4.0, the following contents are removed from the `TiDB-communit
 
 ## Operating system and platform requirement changes
 
-- According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
-- According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version.
+Before upgrading TiDB, ensure that your operating system version meets the [OS and platform requirements](/hardware-and-software-requirements.md#os-and-platform-requirements).
 
-For the supported operating systems and platforms, see [Software and hardware recommendations](/hardware-and-software-requirements.md#os-and-platform-requirements).
+- According to [CentOS Linux EOL](https://www.centos.org/centos-linux-eol/), the upstream support for CentOS Linux 7 ends on June 30, 2024. TiDB ends the support for CentOS 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on CentOS 7 to v8.4.0 or later will cause the cluster to become unavailable.
+- According to [Red Hat Enterprise Linux Life Cycle](https://access.redhat.com/support/policy/updates/errata/#Life_Cycle_Dates), the maintenance support for Red Hat Enterprise Linux 7 ends on June 30, 2024. TiDB ends the support for Red Hat Enterprise Linux 7 starting from the 8.4 DMR version. It is recommended to use Rocky Linux 9.1 or a later version. Upgrading a TiDB cluster on Red Hat Enterprise Linux 7 to v8.4.0 or later will cause the cluster to become unavailable.
 
 ## Removed features