boot2docker-ntp

Re-sync boot2docker's system clock.

Problem:

Boot2Docker's internal clock falls out of sync with your Mac's system clock.

Friendly #docker dev @cpuguy83 explained it thus:

"That's the problem. Since it's running in virtualbox, when your system is sleeping or whatever, it can't re-sync the time. The issue is this... ntp is already running in boot2docker, but do to sleep/resume issues with virtualbox, the time gets too far out of sync for ntp to correct."

Solution:

boot2docker-ntp!

Installation

Clone the repo.

$ git clone git@github.com:beechnut/boot2docker-ntp.git

Copy the boot2docker-ntp script to someplace in your PATH. I keep mine in /usr/local/bin.

If you don't know about path, run

$ echo $PATH

and put the script in one of the folders listed there.

Change the permissions so the script is executable. I use $ chmod 751 /usr/local/bin/boot2docker-ntp.

Usage

$ boot2docker-ntp

will update the time on your Boot2Docker VM by downloading and running cpuguy83/ntpdate.

If you want to use a different NTP time server from the default (0.pool.ntp.org), you can specify it with the -s flag, for example:

$ boot2docker-ntp -s 1.pool.ntp.org