Deploy Ubuntu 14.04 Desktop Using PXE

Deploy Ubuntu 14.04 Desktop Using PXE

This has to be the most poorly documented feature of Ubuntu ever. The more I use it the more I wonder if they aren't losing their focus for corporate use completely. It's almost enough to make me want to play with CentOS. With Ubuntu 12.04 Precise, you were able to deploy Desktop installations by using some files from the "Alternate Install" disk image and a full desktop image. Since you had…

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Posted by Tony on Mar 23, 2015 | Servers, Desktop Linux
Ubuntu 14.04 SSSD and OpenLDAP Authentication

Ubuntu 14.04 SSSD and OpenLDAP Authentication

The first major change with 14.04 was great news. Previously in order to have one of my Linux workstations authenticate users against our OpenLDAP directory required that I make changes to multiple PAM configuration files, add LDAP config files and more. It was quite a mess. Under 14.04, you now have the System Security Services Daemon (SSSD) which does it all from a single configuration file.

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Posted by Tony on Mar 07, 2015 | Servers, Desktop Linux
New Blog Engine

New Blog Engine

I've finally updated my blog into the modern age with a new backend engine and new custom theme. I was able to migrate all of the old posts over and retain the original URL's for everything so all the articles are in the same place still.

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Posted by Tony on Mar 06, 2015 | Web Development
Using VLAN's with ISC-DHCP-SERVER

Using VLAN's with ISC-DHCP-SERVER

I decided I wanted to provide DHCP to two different VLAN's each with their own subnet, connected to the same network card in my default router. All packets arriving on that network jack are tagged for either one or the other VLAN. Initially I had trouble with the DHCP server only seeing packets on the root eth0 device and ignoring all the packets on the vlan devices (eth0.1 for instance.) There's a couple of changes I had to make for this to work. These instructions assume an Ubuntu server.

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Posted by Tony on Feb 28, 2015 | Networking
Linux, iptables, SNAT and Too Many Adapters

Linux, iptables, SNAT and Too Many Adapters

I've had some weird glitches with my primary firewall this week. After a reboot, certain SNAT rules just didn't... happen. Or, other SNAT rules did. And it always seemed to only impact SIP traffic. For instance, after rebooting, SIP traffic from one internal phone server that's destined for another internal phone server at the other end of a VPN connection would spontaneously decide to SNAT itself to an external IP address, yet still go across the tunnel. Or, SIP traffic destined for the outside would decide to route correctly out the right adapter, but leave the private address on it, ignoring the SNAT rule I could plainly see in iptables.

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Posted by Tony on Feb 19, 2015 | Networking, Network Security, Servers
Owncloud and public shares not returning data

Owncloud and public shares not returning data

I just ran into an issue with Owncloud after updating where public password-protected shares would fail to open and just give a blank result to the browser. It turns out this is a problem with the way that Owncloud is using Memcache. Now, I could go into the whole lecture of how Owncloud is using Memcache completely wrong (they are) in more than one way. Instead I'm going to just give you a quick fix. So, if you notice these in your logs:

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Posted by Tony on Oct 03, 2014 | OwnCloud