Description of problem:

$subject says it all

Version-Release number of selected component (if applicable):

v3.2, at least

How reproducible:

always

Steps to Reproduce:
1. start your containers
2. watch /var/lib/docker/container/ dirs fill with logs w/o ever being rotated

Actual results:

/var fills up

Expected results:

/var doesn't fill up

Additional info:

An /etc/logrotate.d/docker config file should ship with docker.  Something like this:

/var/lib/docker/container/*/*-json.log {
    notifempty
    monthly
    rotate 5
    missingok
    compress
    copy-truncate
}