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🚀 Setting Up Prometheus Monitoring for Portfolio

🧐 Step 1: Edit Prometheus Configuration​

Open the Prometheus configuration file using nano:

sudo nano /etc/prometheus/prometheus.yml

Add the following job configuration at the end of the scrape_configs section:

scrape_configs:
  - job_name: portfolio
    static_configs:
    - targets: ['13.201.191.75:9100']
    relabel_configs:
      - source_labels: [__address__]
        regex: '.*'
        target_label: instance
        replacement: 'Prod: Portfolio'

📝 Explanation:

  • job_name: portfolio → Defines a new scrape job for monitoring.
  • static_configs → Specifies the target server to monitor (13.201.191.75:9100).
  • relabel_configs → Changes the instance label from the default IP format to Prod: Portfolio for better readability in Grafana.

🔍 Step 2: Install yamllint (YAML Linter)​

YAML files are indentation-sensitive. Install yamllint to check the syntax:

sudo apt install yamllint -y

After installation, run:

yamllint /etc/prometheus/prometheus.yml

If there are any errors, fix them before proceeding.

🔄 Step 3: Restart Prometheus​

After making changes, restart Prometheus to apply them:

sudo systemctl restart prometheus

Check if Prometheus is running correctly:

sudo systemctl status prometheus

✔️ If everything is correct, you should see active (running) in green.

🎯 Final Notes:

  • Always validate YAML syntax using yamllint before restarting Prometheus.
  • Ensure port 9100 is accessible from the Prometheus server.
  • Monitor logs using: 
    journalctl -u prometheus -f --no-pager
  • Check your Prometheus targets here: http://15.207.86.27:9090/targets