Equipment/Denning: Difference between revisions

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{{EquipmentInfobox
{{EquipmentInfobox
|name=Denning <!-- Name of the item. -->
|name=Denning
|image=Hackspace_Unknown.png <!-- Image of the item. Leave with placeholder image if none exists. -->
|image=Denning-DellOptiplex780.JPG <!-- Image of the item. Leave with placeholder image if none exists. -->
|model=Nexcom DNA1110 <!-- Model -->
|model=Dell Optiplex 780 SFF 4GB Mem / 320GB SATA HD <!-- Model -->
|category=Equipment <!-- Main category. Please leave alone to keep item in this category -->
|category=Equipment <!-- Main category. Please leave alone to keep item in this category -->
|subcat=Systems <!-- Sub-category if one exists. Please check main listing to see other categories contained within the main one -->
|subcat=Systems <!-- Sub-category if one exists. Please check main listing to see other categories contained within the main one -->
|status=Good working order <!-- Set to one of; Good working order, Faulty, Out of order, Under construction, Out of consumables, Scrapped, or Unknown -->
|status=Good working order
|consumables=<!-- Any items used up in normal operation, such as; ink, paper, saw-blades, cutting disks, oil, etc.. -->
|consumables=<!-- Any items used up in normal operation, such as; ink, paper, saw-blades, cutting disks, oil, etc.. -->
|accessories=<!-- Any items associated with the equipment but not consumable, such as; drill bits, safety gloves, goggles, etc.. -->
|accessories=<!-- Any items associated with the equipment but not consumable, such as; drill bits, safety gloves, goggles, etc.. -->
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|trainlink=Unknown <!-- If training is required, provide a link to training signup or contact page. Otherwise leave blank. -->
|trainlink=Unknown <!-- If training is required, provide a link to training signup or contact page. Otherwise leave blank. -->
|acnode=no
|acnode=no
|owner=LHS <!-- Provide a link to owners members page if other than LHS -->
|owner=LHS
|origin=donation from Tgreer <!-- If via pledge, please link to the completed pledge page on the wiki -->
|origin=Donation
|location= <!-- Floor, room/zone and location within that area -->
|location=Ground floor, display area <!-- Floor, room/zone and location within that area -->
|maintainers=Sysadmin team <!-- If someone is nominated as managing the upkeep of this item, please list them here. No links please; it currently breaks the template. -->
|maintainers=Sysadmin team <!-- If someone is nominated as managing the upkeep of this item, please list them here. No links please; it currently breaks the template. -->
|template_ver=1.1 <!-- Please do not change. Used for tracking out-of-date templates -->
|template_ver=1.1 <!-- Please do not change. Used for tracking out-of-date templates -->
}}
}}


== Denning ==
Denning is is named after [https://en.wikipedia.org/wiki/Peter_J._Denning Peter J Denning], best known for pioneering work in virtual memory, especially for inventing the working-set model for program behaviour, which addressed disk thrashing and became the reference standard for all memory management policies.


Runs the non-vital services that used to run on [[Boole]]. Might get used for other stuff as well. Same hardware as [[Boole]]
Same basic Dell Optiplex 780 Quad-Core hardware as [[Bell]] (more detailed hardware configuration there) and now has a nice SSD to use.


Runs zone minder, see below.
Denning provides the following services:


Also a netboot server, provides:
* [[Equipment/The_Beast| The Beast Video Game Arcade System]] - emulation, display and control management.
* Provide redundant fun and joy to those who play with The Beast


* Diskless i386 and amd64 debian wheezy
[[File:Thebeastfromtheside.jpg|200px|thumb|left|Look at that beautiful Beast with a Denning Inside]]
* Rescue and Install for debian wheezy.
[[File:Thebeast.jpg|400px|thumb|center|Beast Fun is possible using Denning]]
* partition magic
* memtest
* [http://www.dban.org/ dban]
* [http://linux.voyage.hk/ 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 [http://www.ansibleworks.com/docs/intro_getting_started.html ansible] for setting up machines in the space.
 
== Zoneminder/cctv ==
 
Has an 8 port video capture card in it. It's currently connected to the 3 yard cameras and the rear lobby camera. The other 4 inputs are disabled until we put more cameras up.
 
The card is one of these (or a clone):
 
* http://www.zoneminder.com/wiki/index.php/File:Karta.jpg
* http://www.zoneminder.com/wiki/index.php/Kodicom_8800
 
The modprobe.d settings I'm using are:
 
<code>
options i2c-algo-bit bit_test=1
options tuner debug=1
options bttv gbuffers=16 card=102,102,102,102,102,102,102,102 radio=0,0,0,0,0,0,0,0 tuner=4,4,4,4,4,4,4,4 audiodev=-1,-1,-1,-1,-1,-1,-1,-1 v4l2=1 bttv_verbose=1 chroma_agc=1 combfilter=2 full_luma_range=1 coring=1
</code>
 
Each input is configured with:
 
* fps: 10
* alarm fps: 25
* palette: BGR24
* resolution: 640 x 480
 
This might just about work with all 8 inputs, we may have to drop the resolution to 360 x 288
 
The [http://www.zoneminder.com/wiki/index.php/Pico2000 old card].
 
== Issues ==
 
Has only a single mechanical harddrive so vulnerable to data loss.
Maybe look at adopting this for netboot stuffs: https://github.com/askarel/Pantoufle
 
=== nfs ===
 
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...
 
==== linkdump:====
 
* https://lists.gnu.org/archive/html/ltib/2010-08/msg00103.html
* https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt
 
==== todo ====
 
* 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 ===
 
<nowiki>
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
reboot
 
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"
 
then:
 
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 (?)
 
then:
 
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.
 
notes:
 
not sure how resolv.conf gets setup, I thought having:
 
iface eth0 inet static
        [...]
        dns-nameservers 172.31.24.2
        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.
 
</nowiki>
 
=== 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 ==
 
; 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.

Latest revision as of 18:20, 8 December 2019

Denning
Denning-DellOptiplex780.JPG
Model Dell Optiplex 780 SFF 4GB Mem / 320GB SATA HD
Sub-category Systems
Status Good working order
Training requirement yes
Training link Unknown
ACnode no
Owner LHS
Origin Donation
Location Ground floor, display area
Maintainers Sysadmin team

Denning is is named after Peter J Denning, best known for pioneering work in virtual memory, especially for inventing the working-set model for program behaviour, which addressed disk thrashing and became the reference standard for all memory management policies.

Same basic Dell Optiplex 780 Quad-Core hardware as Bell (more detailed hardware configuration there) and now has a nice SSD to use.

Denning provides the following services:

Look at that beautiful Beast with a Denning Inside
Beast Fun is possible using Denning
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