installation: update to add Alma/Rocky Linux support

SUMMARY.md

@@ -34,6 +34,7 @@
   * [Build with Static Configuration](installation/sources/build-with-static-configuration.md)
 * [Linux Packages](installation/linux/README.md)
   * [Amazon Linux](installation/linux/amazon-linux.md)
+  * [Alma / Rocky Linux](installation/linux/alma-rocky.md)
   * [Redhat / CentOS](installation/linux/redhat-centos.md)
   * [Debian](installation/linux/debian.md)
   * [Ubuntu](installation/linux/ubuntu.md)

installation/linux/alma-rocky.md

@@ -0,0 +1,84 @@
+# Rocky Linux and Alma Linux 
+
+Fluent Bit is distributed as the `fluent-bit` package and is available for the latest
+versions of Rocky or Alma Linux now that CentOS Stream is tracking more recent dependencies.
+
+Fluent Bit supports the following architectures:
+
+- `x86_64`
+- `aarch64`
+- `arm64v8`
+
+## Single line install
+
+Fluent Bit provides an installation script to use for most Linux targets.
+This will always install the most recently released version.
+
+```bash
+curl https://raw.githubusercontent.com/fluent/fluent-bit/master/install.sh | sh
+```
+
+This is a convenience helper and should always be validated prior to use.
+Older versions of this install script will not support auto-detecting Rocky or Alma Linux.
+The recommended secure deployment approach is to use the following instructions:
+
+## RHEL 9
+
+From CentOS 9 Stream onwards, the CentOS dependencies will update more often than downstream usage.
+This may mean that incompatible (more recent) versions are provided of certain dependencies (e.g. OpenSSL).
+For OSS, we also provide RockyLinux and AlmaLinux repositories.
+This may be required for RHEL 9 as well which will no longer track equivalent CentOS 9 stream dependencies.
+No RHEL 9 build is provided, it is expected to use one of the OSS variants listed.
+
+## Configure Yum
+
+The `fluent-bit` is provided through a Yum repository. 
+To add the repository reference to your system:
+
+1. In `/etc/yum.repos.d/`, add a new file called `fluent-bit.repo`.
+1. Add the following content to the file - replace `almalinux` with `rockylinux` if required:
+
+   ```text
+   [fluent-bit]
+   name = Fluent Bit
+   baseurl = https://packages.fluentbit.io/almalinux/$releasever/
+   gpgcheck=1
+   gpgkey=https://packages.fluentbit.io/fluentbit.key
+   repo_gpgcheck=1
+   enabled=1
+   ```
+
+1. As a best practice, enable `gpgcheck` and `repo_gpgcheck` for security reasons.
+   Fluent Bit signs its repository metadata and all Fluent Bit packages.
+
+## Install
+
+1. After your repository is configured, run the following command to install it:
+
+   ```bash
+   sudo yum install fluent-bit
+   ```
+
+1. Instruct `Systemd` to enable the service:
+
+   ```bash
+   sudo systemctl start fluent-bit
+   ```
+
+If you do a status check, you should see a similar output like this:
+
+```bash
+$ systemctl status fluent-bit
+● fluent-bit.service - Fluent Bit
+   Loaded: loaded (/usr/lib/systemd/system/fluent-bit.service; disabled; vendor preset: disabled)
+   Active: active (running) since Thu 2016-07-07 02:08:01 BST; 9s ago
+ Main PID: 3820 (fluent-bit)
+   CGroup: /system.slice/fluent-bit.service
+           └─3820 /opt/fluent-bit/bin/fluent-bit -c etc/fluent-bit/fluent-bit.conf
+...
+```
+
+The default Fluent Bit configuration collect metrics of CPU usage and sends the
+records to the standard output. You can see the outgoing data in your
+`/var/log/messages` file.
+

installation/linux/redhat-centos.md

@@ -37,6 +37,16 @@ sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /
 
 An alternative is to use Rocky or Alma Linux, which should be equivalent.
 
+## RHEL/AlmaLinux/RockyLinux and CentOS 9 Stream
+
+From CentOS 9 Stream onwards, the CentOS dependencies will update more often than downstream usage.
+This may mean that incompatible (more recent) versions are provided of certain dependencies (e.g. OpenSSL).
+For OSS, we also provide RockyLinux and AlmaLinux repositories.
+
+Replace the `centos` string in Yum configuration below with `almalinux` or `rockylinux` to use those repositories instead.
+This may be required for RHEL 9 as well which will no longer track equivalent CentOS 9 stream dependencies.
+No RHEL 9 build is provided, it is expected to use one of the OSS variants listed.
+
 ## Configure Yum
 
 The `fluent-bit` is provided through a Yum repository. To add the repository
@@ -146,3 +156,10 @@ gpgkey=https://packages.fluentbit.io/fluentbit.key
 repo_gpgcheck=1
 enabled=1
 ```
+
+### Yum install fails with incompatible dependencies using CentOS 9+
+
+CentOS 9 onwards will no longer be compatible with RHEL 9 as it may track more recent dependencies.
+Alternative AlmaLinux and RockyLinux repositories are available.
+
+See the guidance above.

installation/supported-platforms.md

@@ -9,10 +9,10 @@ Fluent Bit supports the following operating systems and architectures:
 |  | [CentOS 9 Stream](linux/redhat-centos.md) | x86_64, Arm64v8 |
 |  | [CentOS 8](linux/redhat-centos.md) | x86_64, Arm64v8 |
 |  | [CentOS 7](linux/redhat-centos.md) | x86_64, Arm64v8 |
-|  | [Rocky Linux 8](linux/redhat-centos.md) | x86_64, Arm64v8 |
-|  | [Rocky Linux 9](linux/redhat-centos.md) | x86_64, Arm64v8 |
-|  | [Alma Linux 8](linux/redhat-centos.md) | x86_64, Arm64v8 |
-|  | [Alma Linux 9](linux/redhat-centos.md) | x86_64, Arm64v8 |
+|  | [Rocky Linux 8](linux/alma-rocky.md) | x86_64, Arm64v8 |
+|  | [Rocky Linux 9](linux/alma-rocky.md) | x86_64, Arm64v8 |
+|  | [Alma Linux 8](linux/alma-rocky.md) | x86_64, Arm64v8 |
+|  | [Alma Linux 9](linux/alma-rocky.md) | x86_64, Arm64v8 |
 |  | [Debian 12 (Bookworm)](linux/debian.md) | x86_64, Arm64v8 |
 |  | [Debian 11 (Bullseye)](linux/debian.md) | x86_64, Arm64v8 |
 |  | [Debian 10 (Buster)](linux/debian.md) | x86_64, Arm64v8 |