Skip to main content

Docker Log Monitoring with LogMonitor

>_ why docker apps need log monitoring

Docker containers are ephemeral: when a container stops or restarts, its logs disappear. Relying on docker logs commands is not scalable across multiple containers and hosts. LogMonitor gives you persistent, real-time log streaming from every container so you never lose visibility into your containerized applications.

>_ how logmonitor works with docker

Integrate the LogMonitor HTTP API into your containerized application. Send an HTTP POST to https://api.logmonitor.io/v1/logs with your log data. The API returns 202 Accepted on success and works with any language or framework running inside a container. Alternatively, use the logmonitor-js or logmonitor_flutter SDK if your app uses those runtimes.

>_ quick start

app.py · python
import requests
import os
import time
LOGMONITOR_URL = "https://api.logmonitor.io/v1/logs"
API_KEY = os.environ["LOGMONITOR_API_KEY"]
def send_log(level, message):
    requests.post(
        LOGMONITOR_URL,
        headers={
            "X-Logmonitor-Api-Key": API_KEY,
            "Content-Type": "application/json",
        },
        json=[{"level": level, "message": message, "clientTimestamp": int(time.time())}],
    )
    # Returns 202 Accepted on success
send_log("info", "Container started")
send_log("error", "Database connection failed")

>_ what you can monitor

  • $Container startup and shutdown events
  • $Application errors inside containers
  • $Health check failures and restarts
  • $Inter-service communication errors
  • $Resource exhaustion warnings (memory, CPU)
  • $Configuration and environment issues

>_ frequently asked questions

$ Do I need to modify my Dockerfile to use LogMonitor?

No Dockerfile changes are required. You integrate LogMonitor at the application level by adding HTTP API calls or the SDK to your code. Just pass your API key as an environment variable.

$ Can I monitor multiple containers in one dashboard?

Yes. Use the same app ID for containers belonging to the same service, or different app IDs to separate them. All logs appear in a single Live Console where you can filter by app, level, or metadata.

$ What happens to logs when a container restarts?

Logs sent to LogMonitor are persisted in the cloud. Even if a container crashes and restarts, all previously sent logs remain available in your dashboard for investigation.

$ Does LogMonitor work with Docker Compose?

Yes. LogMonitor works with any Docker deployment method including Docker Compose, Docker Swarm, and standalone containers. Just ensure your containers can reach the LogMonitor API endpoint.

$ Can I use LogMonitor with sidecar containers?

Yes. You can run a lightweight sidecar container that reads your application's stdout/stderr and forwards it to the LogMonitor HTTP API, though direct integration in your application code is simpler.

>_ related pages

>_ about logmonitor

LogMonitor.io is a log observability platform built for developers who want simple, fast, affordable log monitoring without enterprise complexity. Stream production logs from your users' devices in real-time with native Flutter and React SDKs. Set up in under 5 minutes, with plans starting at $9/month. No dashboards to configure, no query languages to learn — just your logs, live.

logmonitor --start
Ready to see your production logs in real-time?
Start Monitoring →

Plans from $9/mo · Set up in under 5 minutes