Docker Infrastructure Monitoring

Docker Image
Monitoring

Storage Saturation, Stale Tags & Registry Tracking

Stop Docker images from filling up your hard drives. BigBell monitors Docker image storage, tracking dangling images, large layers, and version sprawl across all your hosts.

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Overview

What is Docker Image Monitoring?

Docker Image monitoring tracks the static, read-only templates used to create containers. It involves monitoring the total disk space consumed by images on a host, identifying 'dangling' images (images with no tags that are no longer used), tracking the versions (tags) currently deployed, and alerting on excessive storage consumption before the host disk hits 100%.

Why Docker Image Monitoring Matters

A common cause of Docker host failure is disk exhaustion. Every time a CI/CD pipeline deploys a new version of an app, a new Docker image is pulled to the host. The old images remain on disk indefinitely unless manually pruned. Over a few weeks, hundreds of gigabytes of old, unused images can accumulate, eventually causing the host's disk to fill completely, which hard-crashes all running databases and web servers.

✓Prevent catastrophic host crashes caused by 100% disk usage
✓Identify massive, unoptimized Docker images wasting bandwidth
✓Track which specific versions (tags) of an app are running in production
✓Automate the detection of dangling and orphaned images

Core Use Cases

Essential for CI/CD pipeline maintainers needing to ensure build servers don't run out of disk space, and security teams auditing which base image tags (e.g., ubuntu:18.04 vs 22.04) are active on production hosts.

Features

Complete Images Monitoring Capabilities

💿

Storage Tracking

Monitor the exact amount of disk space consumed by the `/var/lib/docker` directory over time.

🗑️

Dangling Image Alerts

Identify hosts that have accumulated a massive number of untagged (dangling) images that need pruning.

📦

Image Size Profiling

Identify unusually large images (e.g., 2GB+ Java images) that are slowing down CI/CD deployment times.

🔔

Disk Saturation Alerts

Receive critical warnings when Docker image storage pushes host disk utilization past 85%.

FAQ

Frequently Asked Questions

You can run 'docker image prune -a' to safely delete all images that are not currently being used by a running container. BigBell tells you exactly when to do this.

Large images usually result from not using multi-stage builds, or including unnecessary build tools (like compilers) in the final production image layer.

While BigBell tracks image metadata and storage, deep vulnerability scanning (CVEs) is best handled by dedicated registry scanners like Trivy or Clair, which integrate with BigBell.

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