How can I aggregate logs from multiple Docker containers using Docker Compose?

How can I aggregate logs from multiple Docker containers using Docker Compose?

You can aggregate logs from multiple Docker containers by using a logging driver in your Docker Compose file. For example, you can use the 'json-file' driver or a centralized logging service like ELK or Fluentd.

Can you show me an example of a Docker Compose file with log aggregation?

Sure! Here's a simple example:

version: '3'
services:
  app:
    image: myapp
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"
  db:
    image: postgres
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

What if I want to use a centralized logging service?

You can configure your services to send logs to a centralized logging service like Fluentd or ELK. For example, you would set the logging driver to 'fluentd' and specify the Fluentd endpoint.

Are there any performance considerations I should be aware of?

Yes, using logging drivers can impact performance. It's important to choose the right driver and configure log rotation to prevent excessive disk usage.