How to Use Docker Logs: View Container Output Easily

Use the docker logs [OPTIONS] CONTAINER command to see the output of a running or stopped Docker container. This shows the container's standard output and error streams, helping you debug or monitor your container's activity.

Syntax

The basic syntax of the docker logs command is:

• docker logs [OPTIONS] CONTAINER

Where:

• CONTAINER is the container ID or name you want to see logs from.
• OPTIONS modify the output, such as showing timestamps or following live logs.

bash

docker logs [OPTIONS] CONTAINER

Example

This example shows how to run a container and then view its logs using docker logs. It demonstrates how to see the output of a container named myapp.

bash

docker run -d --name myapp busybox sh -c "echo Hello Docker Logs; sleep 10"
docker logs myapp

Output

Hello Docker Logs

Common Pitfalls

Common mistakes when using docker logs include:

• Trying to get logs from a container that does not exist or is not running.
• Not using the -f option to follow live logs when needed.
• Confusing container names or IDs, which must be exact.

Always check container status with docker ps -a before using logs.

bash

docker logs wrong-container-name
# Error: No such container: wrong-container-name

docker logs -f myapp
# Follows live logs until stopped

Quick Reference

Option	Description
-f, --follow	Follow log output live
--since string	Show logs since a specific time, e.g., '2024-06-01T13:23:00'
--tail string	Show only the last N lines, e.g., '100'
-t, --timestamps	Show timestamps with logs

Key Takeaways

Use docker logs CONTAINER to view container output.

Add -f to follow logs live as they are generated.

Check container names or IDs carefully before running the command.

Use options like --since and --tail to filter logs.

If logs are empty, verify the container is running or has output.