Benchmarking WordPress, simple load & speed testing with ApacheBench

WordPress load testing with ApacheBench. ab is a small benchmark utility that comes with Apache. It’s a really simple HTTP load generating tool, ideal for a simple WordPress load & speed test. How fast does your WordPress site respond? How many HTTP requests per second can your server handle? These are questions on which ab…

Continue reading Benchmarking WordPress, simple load & speed testing with ApacheBench

MySQL InnoDB performance improvement: InnoDB buffer pool instances – Updated!

Are you running into MySQL load problems? Learn how to tune MySQL servers for a heavy InnoDB workload, by configuring innodb_buffer_pool_instances. Dividing the InnoDB buffer pool into multiple instances improves Disk I/O. By doing so, you run your database and website more efficiently and faster. Here is a little help for you. Jan ReilinkMy name…

Continue reading MySQL InnoDB performance improvement: InnoDB buffer pool instances – Updated!

Recursive scp and symlinks

Recursive scp without following symbolic links. TL;DR: when using recursive scp, symbolic links aren’t preserved and are copied as if they are normal directories. So you have to look for another solution to recursively transfer symlinks over ssh. Here is one: Tar over ssh! Jan ReilinkMy name is Jan. I am not a hacker, coder,…

Continue reading Recursive scp and symlinks

Install Elasticsearch on CentOS 6.7

How to install Elasticsearch on CentOS 6.7. Elasticsearch is a highly scalable open-source full-text search and analytics engine. It allows you to store, search, and analyze big volumes of data quickly and in near real time. In this article we’ll go over the steps to install Elasticsearch on CentOS 6.7. Jan ReilinkMy name is Jan.…

Continue reading Install Elasticsearch on CentOS 6.7

SSH port forwarding in PuTTY

Tunnel RDP through SSH & PuTTY

How to tunnel Remote Desktop (RDP) over SSH with PuTTY. Have you ever been in a situation where you needed to perform remote administration on a Windows Server, and the RDP port 3389 is blocked on a firewall? Did you know you can tunnel RDP over SSH with PuTTY? This particularly comes in handy when…

Continue reading Tunnel RDP through SSH & PuTTY

Turn off swap

Not every Linux server I maintain needs to have a swap partition and to start swapping. For instance, the MySQL servers all have more than enough RAM on board to do their work. Yet, when a swap partition is enabled Linux starts swapping, which may degrade MySQL database performance… Jan ReilinkMy name is Jan. I…

Continue reading Turn off swap

HTTPS for WordPress

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. Jan ReilinkMy name is Jan. I am not a hacker, coder, developer or guru. I am merely a systems administrator,…

Continue reading Redirect HTTP to HTTPS

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 Open-Xchange backups of course.

Convert decimal to hex in Bash?

A quicky for my archives: Convert decimal to hex in Bash, and hexadecimal to decimal. In mathematics and computing, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A,…

Continue reading Convert decimal to hex in Bash?

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! Jan ReilinkMy name is Jan. I am not a hacker, coder, developer or guru. I am merely a systems administrator, doing my daily thing at Vevida. If…

Continue reading Sysadmins of the North goes global!