Log management in Docker

Docker stores container logs in a local file and doesn’t rotate them by default.
- Add something like the following to /etc/docker/daemon.json to setup rotation.
```
{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "10m",
    "max-file": "2" 
  }
}
```
- Do a systemctl restart docker to restart Docker daemon.
- Also, this config only applies to new containers. So, recreate them by doing something like docker-compose up -d --force-recreate foo.
json-file is the default log format and it might be a good idea to stick with it. For e.g., Promtail doesn’t work with local.