Monitoring Redis with Prometheus and Grafana: Installation, Configuration, Visualization, and Alerting

Prometheus is an open‑source monitoring system that can collect rich metrics and trigger flexible alerts, making it suitable for real‑time monitoring of Redis instances.

1. Install Redis Exporter – Redis Exporter gathers Redis metrics via the INFO and STATS commands and exposes them in a Prometheus‑compatible format.

$ wget https://github.com/oliver006/redis_exporter/releases/download/v1.36.0/redis_exporter-v1.36.0.linux-amd64.tar.gz<br/>$ tar -xvf redis_exporter-v1.36.0.linux-amd64.tar.gz<br/>$ cd redis_exporter-v1.36.0.linux-amd64/<br/>$ mv redis_exporter /usr/local/bin/

Start the exporter so it listens on the default port 9121: $ redis_exporter -redis.addr localhost:6379 & Use --redis.addr to specify the Redis address and add -redis.password <password> if authentication is required.

2. Configure Prometheus – Add a scrape job for Redis in prometheus.yml:

scrape_configs:<br/>  - job_name: 'redis'<br/>    scrape_interval: 5s<br/>    static_configs:<br/>    - targets: ['192.168.214.112:9121']

This configuration defines a job named redis that polls the exporter every five seconds.

Start Prometheus with the new configuration:

$ prometheus --config.file /etc/prometheus/prometheus.yml &

After Prometheus reloads, the Redis metrics will be collected and stored locally.

3. Visualize Metrics with Grafana – Add Prometheus as a data source, import a Redis dashboard template, and configure it to use the Prometheus source. The dashboard shows memory usage, command execution statistics, client connections, and persistence status.

4. Set Up Alerting – Define alert rules in Prometheus to detect abnormal Redis conditions, such as too many client connections:

groups:<br/>- name: redis_alerts<br/>  rules:<br/>  - alert: TooManyConnections  # alert name<br/>    expr: redis_connected_clients > 1000  # expression<br/>    for: 5m  # duration<br/>    labels:<br/>      severity: warning<br/>    annotations:<br/>      summary: "Too many connections (instance {{ $labels.instance }})"<br/>      description: "Redis instance has too many connections
  VALUE = {{ $value }}
  LABELS = {{ $labels }}"

This rule triggers a warning when the number of connected clients exceeds 1000 for five minutes, helping operators respond quickly.

By following these steps, you can achieve end‑to‑end monitoring of Redis, from metric collection to visualization and automated alerting.