OpenStack Compute (nova)

novnc and nova-novncproxy conflict on install

Asked by Cody Sandwith

As per the guide offered at http://docs.openstack.org/grizzly/basic-install/apt/openstack-basic-install-apt-grizzly.pdf
on the bottom of page 11, the document says I should run the following command to install nova:
# apt-get install -y nova-api nova-cert nova-common nova-conductor \
 nova-scheduler python-nova python-novaclient nova-consoleauth novnc \
 nova-novncproxy

However, aptitude shows me the following error, and apparently, nova-novncproxy does not install successfully:
"Unpacking nova-novncproxy (from .../nova-novncproxy_1%3a2013.1-0ubuntu2~cloud1_all.deb) ...
dpkg: error processing /var/cache/apt/archives/nova-novncproxy_1%3a2013.1-0ubuntu2~cloud1_all.deb (--unpack):
 trying to overwrite '/usr/bin/nova-novncproxy', which is also in package novnc 1:0.4+dfsg+1-6"

Now, I'm still learning about Openstack, but I'm gonna go out on a limb and assume that I need novncproxy. What should I do to install it? Should I do something like:
sudo rm -rf /usr/bin/nova-novncproxy && sudo apt-get install nova-novncproxy

**Update**
Tried a couple more things. I did:
sudo apt-get remove novnc nova-novncproxy (which only removed novnc, as nova-novncproxy never installed correctly)
sudo dpkg --force-overwrite --purge novnc nova-novncproxy
And then
sudo apt-get install nova-novncproxy
Which, I was hoping, would JUST install nova-novncproxy (so that I could install it before installing novnc, to see if that would clear anything up). Instead, I got:
"The following extra packages will be installed:
  novnc
The following NEW packages will be installed:
  nova-novncproxy novnc"
And, of course, the same error.

Any help is appreciated

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Bill Weber (bill-weber) said : 		#1

Can reproduce this problem with both Ubuntu 13.04 and 12.04.

Revision history for this message
Bill Weber (bill-weber) said : 		#2

forced package by running
dpkg -i --force-overwrite /var/cache/apt/archives/nova-novncproxy_1%3a2013.1-0ubuntu2~cloud1_all.deb

Revision history for this message
Cody Sandwith (kungfujoe1110) said : 		#3

I hope the status "answered" is distinct from "resolved". Telling dpkg to force overwrite files is hackish at best.
That said, using the hack, I am able to move on, but technically speaking this bug is not resolved.

Revision history for this message
saurabh hirani (saurabh-hirani) said : 		#4

Doing the --force-overwrite does install nova-novncproxy but further package installation cause errors like:

The following packages have unmet dependencies:
 nova-novncproxy : Depends: nova-common (= 2013.1-2) but 2013.1.2-2~bpo70+1 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

So I uninstalled nova-nonvcproxy by dpkg --remove nova-novncproxy

and as i was setting up the controller node - I installed nova-consoleproxy which AFAIK acts as a frontend proxy for novnc, spicehtml5 and other types of console viewers. That got installed and along with it came /etc/init.d/nova-nonvcproxy

nova-consoleproxy decides which console viewer to use depending on the value set in /etc/default/nova-consoleproxy. I updated it to have novnc and then doing:

ls /etc/init.d/nova* | while read line; do $line restart; done

started nova-novncproxy along with the usual set of services.

Hope this helps.

--
regards,
Saurabh.

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