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Preview: Debian GNU/Linux System Administration Resources

Debian GNU/Linux System Administration Resources

Tips for a Debian GNU/Linux System Administrator.


Performing IMAP queries via curl

Thu, 14 Jan 2016 08:27:45 GMT

Most people are familiar with curl, the tool that allows you to make HTTP-requests, and FTP-requests, via the command-line. Recently it gained the ability to perform IMAP operations, and this brief article demonstrates how that is done.

Simplifying repetitive Apache configuration with mod_macro

Wed, 9 Dec 2015 12:34:40 GMT

Apache is one of the more flexible webservers, and most of this is achieved via the use of various extension modules bundled with it, or externally available. mod_macro is a great module allowing you to simplifying configuration of multiple virtual hosts enormously.

Enabling swap on debian based system

Tue, 8 Dec 2015 18:01:55 GMT

Recently I found myself without a swap partition (having installed another OS and reworked my disk-setup) so I wanted to share a quick guide to enable swap again.

Offering IPv4-only services over IPv6

Sun, 29 Nov 2015 08:06:53 GMT

Although IPv6 is clearly the way of the future there are some software services which only support IPv4 access. Here we'll show a simple approach to exporting them to IPv6-based clients.

Analysing performance problems with systemd

Sat, 26 Sep 2015 18:06:21 GMT

Now that Systemd is the default init-system in fresh installations of Debian GNU/Linux it is worth highlighting some of the new features.

Validating SPF and DKIM at SMTP-time with exim

Tue, 4 Aug 2015 07:58:50 GMT

In our recent articles we've discussed creating SPF-records to avoid spoofed mails, and the creation and setup for DKIM-signing emails, for a similar purpose. Here we'll look at the other side of the coin; performing DKIM and SPF testing on your incoming email.

Tying together SPF and DKIM with DMARC

Mon, 3 Aug 2015 19:35:22 GMT

When it comes to increasing deliverabiity of email, and preventing spoofed/forged emails the preferred solution these days is DMARC, which allows the use of SPF and DKIM to be enforced for domains in a unified manner.

Avoiding mail-spoofing with SPF

Sat, 1 Aug 2015 17:34:33 GMT

The Sender Policy Framework, or SPF, is an email-validation system which is designed to allow spoofed mails to be indentified. In this brief introduction we'll look at how you can configure your outgoing emails to take advantage of this validation.

DKIM-signing outgoing mail with exim4

Wed, 29 Jul 2015 06:28:20 GMT

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.

Setting up a personal secure apt repository

Sun, 24 May 2015 09:58:32 GMT

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