January 30, 2018

Multiple Printers on Octoprint

First we create multiple instances of octopi itself.

sudo su -
cd /home/pi
cp .octoprint .printer1
cp .octoprint .printer2

cd /etc/init.d
update-rc.d -f octoprint remove
cp octoprint printer1
cp printer1 printer2

cd /etc/default
cp octoprint printer1
cp octoprint printer2

Now we edit some files.

May 1, 2016

Amazon echo for home automation using x10 and ifttt.com

The way this works currently is you need to be able to access a remote url inside your home.  Usually this will require the use of a dynamic dos host provider that can provide you with a hostname that points to your dynamic home address that is updated automatically by your router.  This is not exactly ideal security wise but obscure enough that you’re not likely to have some hacker turning your lights on and off just to mess with you and about the worst case scenario is they turn all your lights on while you are way turning up your electric bill.

March 24, 2015

Updating Bind File on a Zone Setup for RFC 2845

Bind is horrible at telling you what is going on if you happen to have the setup and mess it up.

February 26, 2015

Apache and mod_mono on rasbian

Mod_mono is much easier to config at the moment than it has been int he past.  Assuming you can use apt-get and installed the packages the following is all you need.

May 28, 2014

Upgrading Bugzilla

Here are the steps to upgrading bugzilla so you don’t end up wanting to commit homicidal acts.

Download a new version of bugzilla and resist the patches.


Unpack this new version into a newdirectory. I use the /usr/local directory.

root@sourcecontrol:/usr/local# ls -l
total 40
drwxr-x--- 16 www-data www-data 4096 May 28 11:36 bugzilla-4.4.2
drwxr-x--- 16 www-data www-data 4096 May 28 11:46 bugzilla-4.4.4

Now I keep a symlink in /var/www that points to the current version so i delete and update the symlink here.

ln -s /usr/local/bugzilla-4.4.4 /var/www/bugzilla
ls -l /var/www
lrwxrwxrwx 1 root root   26 May 28 11:37 bugzilla -> /usr/local/bugzilla-4.4.4/

Next enter the new bugzilla directory and update the perl modules using the built in script.

./install-module.pl --all

Once that is complete copy the localconfig form the previous installation into the new installation.

cp /usr/local/bugzilla-4.4.2/localconfig /usr/local/bugzilla-4.4.4/

Then run checksetup.pl and you should be up and running.


May 20, 2014

Ubuntu Upgrade Apache Fail

Upgraded to Ubuntu 14.04 LTS and discovered apache was not starting up.


The culprit was the following message.

AH00534: apache2: Configuration error: No MPM loaded.

After some digging around it appears the problem has to do with the module being enabled in apache so running the following as root or with sudo clears things up.


a2dismod mpm_itk

a2enmod mpm_itk

January 17, 2014

Ubuntu Gutsy Gibbon Hardy Heron update failed OEL upgrade

So today while trying to VM an old server at work I ran into a problem. It was running Ubuntu 7.10 (Gutsy Gibbon) and would not virtualize properly. I tied to upgrade it using the EOL Path at ubuntu.com to 8.04 (Hardy Heron) but it just wouldn’t work I ended up with the following.

Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
extracting '/tmp/tmpGEx2kl/hardy.tar.gz'
Failed to extract
Extracting the upgrade failed. There may be a problem with the network or with the server.

This clearly isn’t good but after paring my /etc/apt/sources.list down to the following I was still getting the same error.

deb http://old-releases.ubuntu.com/ubuntu dapper main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu dapper-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu dapper-proposed main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse

With the modification from archive.ubuntu.com to old-releases.ubuntu.com I figure it was really just modifying the server it was retrieving the files from and even though the remote server could be using the host header I though I would try modifying my /etc/hosts file to point to the same ip for archive.ubuntu.com as was resolved for old-releases.ubuntu.com.

/etc/hosts archive.ubuntu.com

It worked running do-release-upgrade now returns

Checking for a new ubuntu release
Done Upgrade tool signature
Done Upgrade tool
Done downloading
extracting '/tmp/tmpXpWtyk/hardy.tar.gz'
authenticate '/tmp/tmpXpWtyk/hardy.tar.gz' against '/tmp/tmpXpWtyk/hardy.tar.gz.

Reading cache

Checking package manager

Continue running under SSH?

This session appears to be running under ssh. It is not recommended
to perform a upgrade over ssh currently because in case of failure it
is harder to recover.

If you continue, a additional ssh daemon will be started at port
Do you want to continue?

So apparently really old versions of ubuntu have archive.ubuntu.com hard coded in the updater and this trick should get around it. Thank god they don’t use virtual hosts for their archives.

June 21, 2013

Mountain Lion broke X11

Want to run apps under linux and pipe the graphical display to your mac using mountain lion?  This is how you do it.

July 4, 2012

DDWRT Custom Nocat Splash

OK, the documentation on ddwrt no cat splash kind of works but mostly just leaves you wondering wtf.  It works with their little click me to login/accept page but how do you customize it.  First thing to realize is it may appear to be accepting your settings but it caches and doesn’t play a nice.  After a reboot you might be sitting there for a few minutes before boom it’s working and your left wondering what they hell did I do to make it work?

July 3, 2012

Raspberry Pi GPIO in .net

I setout to create a simple library for raspberry pi gpio using the slow but easy to work with file system gpio.  This is useful for low speed io such as controling relays and such.  If you can live with a couple hundred ms latency this is a useful class for that.  I am currently using it to control a set of lawn sprinklers and low voltage lighting.