Probe hanging with docker 1.9.1 and coreOS Alpha

[paulbellamy]

Seems to be happening for a user on coreOS, docker 1.9.1. See if we can replicate, and if it is on docker 1.9.0 as well.

[tomwilkie]

Closing in favour of #769, as there is more info there.

[paulbellamy]

For reference, user here was using xhyve, not virtualbox.

[2opremio]

This was a different issue, the system wasn't hanging and the probe logs didn't show anything unusual but the UI didn't display anything. One of the possibilities is that the probe is not sending reports or empty reports.

[2opremio]

I can reproduce it in a Vagrant VM ('coreos-alpha' (v933.0.0)) and scope:latest:

git clone https://github.com/coreos/coreos-vagrant.git
cd coreos-vagrant
cp user-data.sample user-data
cp config.rb.sample config.rb
vagrant up
vagrant ssh
curl -s -L https://raw.githubusercontent.com/weaveworks/scope/master/scope -o scope && chmod +x scope && ./scope launch

The UI shows containers for a while but then they went away and the whole system froze (in a similar way to #769 ) which I believe didn't happen when @rimusz showed us (since according to @paulbellamy he was using xhyve).

[2opremio]

I can confirm that the coreos Vagrant box enables natdnshostresolver causing the same problem as #769:

$ grep -B 1 nat ~/.vagrant.d/boxes/coreos-alpha/935.0.0/virtualbox/Vagrantfile 
    # Fix docker not being able to resolve private registry in VirtualBox
    vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
    vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]

Which suggests that although natdnshostresolver is not enabled by default, it may be common.

However, after setting those flags to "off", I can launch Scope and everything works as expected (the reports from the probe are definitely reaching the app and containers are displayed).

@rimusz can you please try to reproduce again and, if you can, provide us with specific instructions on how you did it?

[rimusz]

all good on my tests with the latest alpha/beta/stable, but I'm not using vagrant but xhyve based coreos installs on my Mac

[2opremio]

Closing then. Thanks @rimusz !