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DKIM-signing outgoing mail with exim4

Posted by Steve on Wed 29 Jul 2015 at 06:28

There have been several systems designed to prevent mail spoofing over the years, the two most prominent solutions are DKIM and SPF. Here we're going to document the setup of using DKIM to signing outgoing mails with Debian's default mail transfer agent, exim4.

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Setting up a personal secure apt repository

Posted by wijnen on Sun 24 May 2015 at 09:58

Packages under development aren't always ready to be in the main Debian archive. But that doesn't mean it should be hard for people to install them. When asking people to test programs, it is most convenient to present it in the

( Read 853 more words ~ 1 comment posted )

Preventing SPAM connections with bird.

Posted by Steve on Fri 22 May 2015 at 07:25

Bird is an Internet routing daemon with full support for all the major routing protocols. It allows you to configure hosts to share routing information, via protocols such as BGP, OSPF, or even statically. Here we're going to look at using it to automatically blacklist traffic from SPAM-sources.

( Read 745 more words ~ 7 comments posted )

Using the rubocop ruby code and style analyzer

Posted by Steve on Mon 9 Mar 2015 at 12:12

If you're developing code that you expect others to read and work with then it is very important to pick a consistent style, and having a style-checker can make enforcing your choice much less painful. Here we'll take a look at the rubocop analyzer for Ruby.

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Easily working with multiple repositories (git, hg, etc)

Posted by Steve on Sun 8 Feb 2015 at 18:00

There are situations where it is ueful to checkout multiple repositories, which might use different revision control systems, and operate upon them as a group. This is what the mr tool was designed for.

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An introduction to the attic backup program

Posted by Steve on Tue 23 Dec 2014 at 11:09

Over the past year or two several new backup utilities have become popular. These new tools tend to avoid the use of tar.gz files, and just store backups as collections of files. Usually these storage areas are incrementally updated and avoid wasting space thanks to the detection of duplicate content. Here we're going to look at one of them in particular "attic".

( Read 1269 more words ~ 14 comments posted )

A brief introduction to publish-subscribe queuing with redis

Posted by Steve on Wed 17 Dec 2014 at 16:46
Tags: ,

In this brief article we'll demonstrate using Redis for a publish/subscribe system. There are dedicated publish-subscribe platforms out there, but Redis is reasonably performant and essentially configuration-free.

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Setting up your own graphical git-server with gitbucket

Posted by Steve on Tue 14 Oct 2014 at 09:18
Tags: ,

This article documents the process of configuring a git host, using gitbucket, which will give you a graphical interface to a collection of git repositories, accessible via any browser, along with support for groups, issues, and forks.

( Read 664 more words ~ 9 comments posted )

Using the haproxy load-balancer for increased availability

Posted by Steve on Wed 27 Aug 2014 at 14:12

HAProxy is a TCP/HTTP load-balancer, allowing you to route incoming traffic destined for one address to a number of different back-ends. The routing is very flexible and it can be a useful component of a high-availability setup.

( Read 1774 more words ~ 4 comments posted )

Automating the Debian installer with PXE and preseeding

Posted by Steve on Sat 23 Aug 2014 at 12:34

This article is designed to introduce the process of PXE-booting a host directly into the Debian installer, and then automating the installation via the Debian PreSeed configuration. Both of these topics have been covered in the past, but not together - and we'll also include notes on testing this setup with KVM.

( Read 1230 more words ~ 8 comments posted )