Sysadmins be welcome!
Sysadmins of the North is just another technical blog, like so many others out there. Most posts are written in English, some in Dutch. For the most part, I write as it comes; posts may seem incoherently written sometimes (my apologies). Here on Saotn.org you’ll find all kinds of computer, server, web, sysadmin, database and security related stuff. Browse the latest posts per category here, search for posts, or make a selection from the categories menu.
Joomla! performance tuning on Windows IIS. In this article, I’ll show you how to improve the performance of Joomla! on Windows/IIS with just
three six (6) important, but basic, performance tips. Everyone wants a fast loading website, whether it’s based on WordPress, Drupal, Joomla, or something else. For WordPress, a lot of posts are available here to optimize WordPress performance, and Drupal can easily be improved with the BOOST module.
But what about Joomla? How can we optimize and improve Joomla!’s performance and speed easily? Here are
three six (6) tips to improve Joomla performance and website loading speed.
Jason Deacon, from Australia’s design and development company Wiliam , writes about how to use a back-end instance of Umbraco 7, which is completely decoupled from the front-end (an ASP.NET MVC 5 site).
Our approach leverages a file called “Umbraco.config” which is really just a XML file which Umbraco publishes all its public content to whenever a node is published in the interface. This XML structure mirrors the document types and properties of the site structure populated in Umbraco and therefore offers the perfect snapshot of the content the site can serve, without having to query a database for it.
At Vevida, we like to help our customers as much as possible. Even with optimizing a MySQL database if they don’t ask for it (when they don’t know performance can be improved), just because we spot a slow query in our slow-query log.
The other day I spotted the following in MySQL slow-query log:
MySQL storage engine, MyISAM versus InnoDB: if you want to convert a MyISAM table to InnoDB, the process is fairly easy.
In the earlier days of MySQL, the default storage engine for your database was MyISAM. This is why you still encounter a lot of examples with
engine=MyISAM online. Nowadays, the InnoDB storage engine is MySQL’s default. MyISAM is no longer actively developed, InnoDB is. Therefor, all/most MySQL performance optimizations are for the InnoDB engine and it’s wise to choose this as your table storage engine.
As you know, more and more web hosting providers require SMTP authentication (often abbrevated as SMTP AUTH) and a TLS encrypted connection to send email. Here you’ll find some script examples to send SMTP AUTH email over TLS with ASP, ASP.NET and PHP. Can we do the same with Ghost and Node.js?
import posts from wordPress in Ghost
A little while ago I installed Ghost on IIS, along with the required Node.js and iisnode module. All in an isolated test environment, in which Ghost runs as a production site only. Now I wanted to import a WordPress blog into Ghost, but failed.
Here’s how I resolved this particular Ghost import error.
From time to time you need to flush MySQL’s query_cache to prevent fragmentation of free query cache memory space. Whether we need to flush the query cache is provided to us by MySQL’s
Qcache_free_blocks status information. The higher the value, the more fragmented free space is. Note: Flushing the query cache does not delete it. Use
reset query cache for that.
InnoDB 1.1 for MySQL 5.5 – How to tune MySQL server performance and optimize MySQL’s InnoDB storage engine. It is important to tune and optimize your MySQL server’s configuration to run your website, or application efficiently. And here is a little help …
Dutch tech-news site NUtech.nl wrote an extensive article on how to use PGP to encrypt your email. The article is somewhat comparable with my article “Encrypt email with PGP/GnuPG” but dives deeper into the matter.
In Dutch: Zo versleutel je je e-mail met PGP
or at least, rethink it through before buying one
This is personal rant towards #Acer, with an advice undertone: really, really investigate the computer or laptop you want to purchase, because you might get an unhappy surprise that later on the laptop doesn’t meet your expectations.
Delete all MAILER-DAEMON emails in Postfix queue if it matches a sender or recipient email address condition. When a large scale spam run was sent through your mail servers, you need to clean up and remove those spam messages. Doing so guarantees normal, valid email messages being sent quickly and the spam messages never leave your queue. In Postfix, there are various similar commands to delete messages from the Postfix mail queue. Based on the Message-ID and/or email address…
Malware Must Die! has done a great, and extensive write-up on the subject of hacked and abused FTP sites (accounts). This topic fits well within my daily routine investigating and closing down hacked websites, for which I have to use various techniques for finding those hacked sites. As you might know, website security is one of the major themes of this site.
Test MySQL database connectivity with ASP.NET, PHP, ASP
Whenever you need to test the MySQL database connectivity from a website or server, it’s handy to have various test scripts nearby. Whether it is because you are setting up a new website or you have just installed a new server and are running your tests. Nowadays, many websites depend on a MySQL or MariaDB database because CMS systems like WordPress, Joomla and Drupal are so popular, and Umbraco too. You want your webserver to connect to MySQL fast and properly
How to hide file extensions, such as .php or .asp, with URL Rewrite.
Sometimes it’s important to hide the file extension of scripts you use. Security by obscurity might be one of those reasons, if you don’t want others to know what script language you are using. Or you just want to hide the file extension for no apparent reason.
Test StartTLS connections and SMTP-AUTH from the Linux and Windows command line
While investigating SMTP authentication issues, over an Transport Layer Security (TLS) encrypted connection, it’s always handy if you are able to test the SMTP authentication and StartTLS connection from the command line. SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol whereby an SMTP client may log in using an authentication mechanism chosen among those supported by the SMTP server.
Brandon Cannadya – the CTO of Modulus, a Node.js application hosting platform – wrote an absolute beginner’s guide to node.js.
There’s no shortage of Node.js tutorials out there, but most of them cover specific use cases or topics that only apply when you’ve already got Node up and running. I see comments every once and awhile that sound something like, “I’ve downloaded Node, now what?” This tutorial answers that question and explains how to get started from the very beginning.
What is Node.js?
A lot of the confusion for newcomers to Node is misunderstanding exactly what it is. The description on nodejs.org definitely doesn’t help.
Read on at An Absolute Beginner’s Guide To Node.js
Saotn.org uses IIS Outbound Rewrite Rules to offload content from a different server and/or host name. This should improve website performance. Just recently I noticed these Outbound Rules confliced with compressed (gzip) content. I started noticing HTTP 500 errors with the error message:
Outbound rewrite rules cannot be applied when the content of the HTTP response is encoded ("gzip").
This is how I resolved this error.