How to Follow Docker Container Logs Easily

Use the docker logs -f <container_name_or_id> command to follow container logs in real-time. The -f flag streams new log entries as they appear, letting you monitor your container output live.

Syntax

The basic syntax to follow Docker container logs is:

• docker logs: Shows logs of a container.
• -f or --follow: Streams logs live, like watching a live feed.
• <container_name_or_id>: The name or ID of the container whose logs you want to see.

bash

docker logs -f <container_name_or_id>

Example

This example shows how to follow logs of a running container named myapp. It streams new log lines as they appear.

bash

docker logs -f myapp

Output

[2024-06-01T12:00:01Z] Server started on port 8080
[2024-06-01T12:00:05Z] Received request /home
[2024-06-01T12:00:10Z] Sent response 200 OK

Common Pitfalls

Some common mistakes when following container logs:

• Not using the -f flag, which shows only existing logs and exits immediately.
• Using the wrong container name or ID, resulting in an error.
• Trying to follow logs of a stopped container, which shows logs but no live updates.

Always check your container is running with docker ps before following logs.

bash

docker logs myapp
# This shows logs once and exits

docker logs -f wrongname
# Error: No such container

# Correct way:
docker logs -f myapp

Quick Reference

Command	Description
docker logs	Show all logs of the container once
docker logs -f	Follow logs live as new entries appear
docker ps	List running containers to get names or IDs
docker logs --tail 10	Show only last 10 log lines

Key Takeaways

Use docker logs -f <container> to follow logs live.

Check container name or ID with docker ps before following logs.

Without -f, logs show once and then stop.

Following logs of stopped containers shows no live updates.

Use --tail to limit log lines shown.