linux - Sysadmins of the North

Turn off swap

Swapping is costly for disk I/O and not every Linux server needs to have a swap partition and to start swapping. For instance, MySQL servers have more than enough RAM available to do their work. Yet, when a swap partition is enabled Linux starts swapping, and that degrades MySQL database performance.

Published on Wednesday, 25 March 2015

Redirect HTTP to HTTPS

In this post I provide you various HTTP to HTTPS redirection methods, for Windows Server IIS and Linux Apache. Use these examples to your advantage to secure the traffic between your visitors and your website.

Published on Friday, 13 March 2015

Monit monitoring on Ubuntu 14.04 VM on Hyper-V

In this post you'll learn about setting up a Monit monitoring service for your websites and services. Monit is a free and open source service monitoring application which can perform various event-based actions. Monit can send email notifications, restart a service or application, or take other responsive actions. We set Monit up on a Ubuntu 14.04 VM, built on Hyper-V. And we use Monit to monitor several websites, and send out notifications on downtime.

Published on Sunday, 15 February 2015

How to restore a deleted Open-Xchange context?

How to restore, or recover, an accidentally deleted OX context. If you've accidentally deleted an Open-Xchange context (contextid), then that is bad... Here is how to recover a deleted OX context and filestore... Assuming you make backups of course.

Published on Wednesday, 21 January 2015

Convert decimal to hex in Bash?

A quicky for my archives, learn how to convert decimal to hex and hexadecimal to decimal, in Bash...

Published on Thursday, 6 November 2014

Sysadmins of the North goes global!

How to set up a global Geolocation DNS load balancing Varnish Cache Content Delivery Network with Bind9, geo-ip database, Varnish Cache and DigtalOcean. DIY High-Availability for your website!

Published on Wednesday, 29 October 2014

How to flush MySQL query cache from time to time

From time to time you need to flush MySQL's query_cache to prevent fragmentation of free query cache memory space. In this post, you'll learn how to flush the MySQL query cache unattended / automatic through a Linux cronjob and manually on the MySQL shell.

Published on Sunday, 15 June 2014

Minify JavaScript, CSS and compress images

Optimizing, minify and compressing JavaScript and CSS files, the easy and fast way? With YUI Compressor on the Windows-, Linux- and macOS command line of course! Compacting HTML, CSS, and JavaScript can speeds up your website because of smaller and faster downloads, parsing, and execution time.

Published on Sunday, 18 May 2014

Test SMTP Authentication and StartTLS

Investigate SMTP authentication issues like a boss! Particular over TLS encrypted SMTP connections, it's always handy if you are able to test the SMTP authentication and StartTLS connection. Preferably from your command-prompt.

Published on Saturday, 17 May 2014

Check, repair and optimize MySQL tables with mysqlcheck

Mysqlcheck is a command line table maintenance program for MySQL. It checks, repairs, optimizes, or analyzes MySQL tables. Very handy for _automated performance optimizations_ of MySQL databases and tables. In this post I'll show you how to use `mysqlcheck` to optimize all MySQL tables using a cronjob.

Published on Friday, 2 May 2014

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