i noticed that the ntpd process gets started with a hard-coded list of ntp-servers:

: ${NTP_SERVER:='0.boot2docker.pool.ntp.org 1.boot2docker.pool.ntp.org 2.boot2docker.pool.ntp.org 3.boot2docker.pool.ntp.org'}

nowadays, many companies block outgoing NTP-traffic (to prevent DDoS attacks), which makes this sub-optimal (eventually resulting in hangs until the ntpd times out).

i would have expected to be able to override the NTP_SERVER variable, but changes to /var/lib/boot2docker/profile seem to have no effect (that files seems to be only used by the docker process).

obviously, the NTP_SERVER value is meant to be settable (and the list of ntp-servers is only a fallback), but i don't see a way to inject any values.