Difference between revisions of "Equipment/Denning"

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(nfs issues)
(add a brief how to on removing users.)
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* Upgrade kernel on the amd64 diskless image
* Upgrade kernel on the amd64 diskless image
== using Ansible with a Rasbperry Pi ==
== Ansible procedures ==
=== using Ansible with a Rasbperry Pi ===
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=== Removing an admin ===
edit <code>/etc/ansible/lhs/vars/defaults.yml</code>, remove them from users, add them to disable_users, then re-run ansible.
== Ansible Troubleshooting ==
== Ansible Troubleshooting ==

Revision as of 01:48, 11 March 2014

Hackspace Unknown.png
Model Nexcom DNA1110
Sub-category Systems
Status Good working order
Last updated 8 December 2019 18:20:33
Training requirement yes
Training link Unknown
ACnode no
Owner LHS
Origin donation from Tgreer
Maintainers Sysadmin team


Runs the non-vital services that used to run on Boole. Might get used for other stuff as well. Same hardware as Boole

Runs zone minder and has a not very good 4 port TV capture card in it, currently connected to the 3 yard cameras and the rear lobby camera.

Also a netboot server, provides:

  • Diskless i386 and amd64 debian wheezy
  • Rescue and Install for debian wheezy.
  • partition magic
  • memtest
  • dban
  • Voyage (a minimised debian disto that can run from readonly media) Warning : the Voyage auto install kernel will reformat things they are booted on without prompting.

Also runs ansible for setting up machines in the space.


Has only a single mechanical harddrive so vulnerable to data loss. Maybe look at adopting this for netboot stuffs: https://github.com/askarel/Pantoufle


Denning runs a few diskless nfs clients via pxe etc, unfortunatly nfs dosn't work very well, and i don't know why.

  • The kernel used nfs v3 over tcp
  • the mount works on my laptop (manual mounting)
  • dosn't work on the spaces "windows" laptop (when netbooting)
  • dosn't work on new colin (?) (when netbooting)
  • i386 seems to work (?)
  • but i386 has a newer kernel...



  • Try other machines incase it's a wierd nic driver bug
  • Try more i386 vs. amd64.
  • Upgrade kernel on the amd64 diskless image

Ansible procedures

using Ansible with a Rasbperry Pi

dd raspbian image (use the 02-09 one to avoid usb issues)
boot pi
watch dhcp logs on boole
ssh pi@ip
passwd: raspberry

sudo raspi-config
update it
expand filesystem
change password
boot to console
advanced options -> hostname

cd /etc/network
edit interfaces to get a static ip

on boole:

add hostname to fwd and rev. dns, don't forget to commit your changes.

log into denning with ssh keys forwarded

add hostname to /etc/ansible/hosts in both the [lhshosts] and [rpis]
sections, and [doorbot] if it's a doorbot, make the syslocation="something sensible"


if it's a replacement for an old machine then:

ssh-keygen -R hostname
ssh-keygen -R hostname.lan.london.hackspace.org.uk
ssh-keygen -R ipv4 address (?)
ssh-keygen -R ipv6 address (?)


cd /etc/ansible

install python-apt which ansible needs:

ansible -vvv -u pi -k -s -m command -a "apt-get -y install python-apt" "hostname"

Then run it

ansible-playbook -u pi -s -k -l "hostname" lhs/site.yml

The 2nd one will add our users, ssh keys, packages, etc etc.


not sure how resolv.conf gets setup, I thought having:

iface eth0 inet static
        dns-search lan.london.hackspace.org.uk

Would sort it, but maybe that dosn't and we got lucky from dhcp?

The dns stuff in /etc/network/interfaces appears to be bogus and resolv.conf needs to be
done manually, add to ansible.

Removing an admin

edit /etc/ansible/lhs/vars/defaults.yml, remove them from users, add them to disable_users, then re-run ansible.

Ansible Troubleshooting

problem, ansible dies in the snmp config cos it can't find a default ipv4 address.
fix: make sure the machine has an ipv4 default route
problem, the sshfp stuff just has hostname. rather than hostname.lan.london.hackspace.org.uk.
fix: edit /etc/hosts on the effected machine so that both the long and short versions of the hostname are in there.