Logging containers' output

Logging of the stdout and stderr can be facilitated using Docker's logging adapters. However, using logging adapters is relatively complex and requires additional user's knowledge for extraction of the logs. For that reason, we are utilizing a custom solution that requires zero configuration and minimal knowledge.

DogTail

DoGTail (Docker Go Tail) is a lightweight, zero-configuration logging sidecar Docker Compose. It automatically tails the stdout and stderr streams from all containers in a Compose session, storing them in organized, plaintext log files for easy access.

Please follow to the official DogTail repository to learn more about it:

Example usecase

The following compose files shows how to load DogTail into a compose session. The resulting logs will be stored in the logs volume and accesible via Portainer.

volumes:

  logs:

services:

  myapp:
    image: your-image
    tty: true # this ensures the stdout and stderr are ordered properly in the logs
    # your app configuration here

  dogtail:
    image: klaxalk/dogtail:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - logs:/etc/logs:consistent