This n8n workflow template is designed to help system administrators and DevOps professionals monitor key resource usage metrics — CPU, RAM, and Disk — on a VPS (Virtual Private Server). The workflow automatically checks these resources every 15 minutes and sends an email alert if any resource usage exceeds the 80% threshold. This proactive monitoring helps maintain optimal server performance and prevents resource-related downtimes.

Who This Workflow Is For

• System Administrators managing Linux-based servers who need to ensure their systems are running smoothly without manual monitoring.
• DevOps Professionals who manage multiple environments and need automated tools to alert them to potential issues before they affect operations.
• IT Support Teams who require an easy way to keep tabs on server health across an organization’s infrastructure.

How It Works

1. Schedule Trigger: The workflow is triggered every 15 minutes by a Cron node.
2. Resource Checks: Separate SSH Command nodes are configured to execute specific commands that check the current usage of RAM, Disk, and CPU.
3. Data Aggregation: The results from each check are merged using a Merge node, which combines the data into a single payload for analysis.
4. Threshold Analysis: A Function node evaluates whether any resource’s usage exceeds the predefined 80% threshold.
5. Alerts: If any metric exceeds the threshold, an email alert is sent through an Email node, ensuring that administrators can react promptly to potential issues.

Setup Steps

1. Configure SSH Nodes: Update each SSH node with the appropriate credentials and target server details where the resource checks will be performed.
2. Set Thresholds: If different sensitivity levels are required, review and adjust the resource usage thresholds within the Function node.
3. Email Configuration: Enter the correct email addresses in the Email node for where alerts should be sent. Ensure that your email-sending credentials and server details are correctly configured.