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Setting up Monit monitoring in Windows Subsystem for Linux WSL
A couple of years ago, I wrote a blog article about setting up Monit monitoring on an Ubuntu VM on Hyper-V. Now it’s time to do the same, but then in Windows Subsystem for Linux, or WSL. So, without further ado, here is how to install and configure Monit monitoring in Windows 10 WSL.
Continue readingVulnerabilities in .NET Core, ASP.NET Core Could Allow Elevation of Privilege
Microsoft Security Advisory 4021279: Microsoft is releasing this security advisory to provide information about vulnerabilities in public .NET Core and ASP.NET Core. This advisory also provides guidance on what developers can do to update their applications correctly.
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 can shed some light.
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.
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!
Continue readingInstall Varnish Cache on CentOS 6.7
In this article I’ll show you how to install Varnish Cache on CentOS, version 6.7 in this case. Varnish is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Because Varnish Cache is really, really fast, web applications like WordPress, Drupal and Joomla can greatly benefit from Varnish Cache.
Continue readingInstall 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.
Continue readingGenerate pseudo-random passwords with OpenSSL
OpenSSL comes in handy when you need to generate random passwords, for example for system accounts and services. In this short post I’ll give you a quick example on how to generate random passwords with OpenSSL in Linux (Bash), Windows and PHP…
BIND 9.x vulnerable for remote Denial of Service through a magic packet
A vulnerability in BIND, and all it takes is just one tiny little packet…
BIND 9.x is vulnerable for a remote Denial of Service, where a tiny magic packet can cause BIND 9.x to stop and exit named with a REQUIRE assertion failure. All the attacker needs to send is a specially – and deliberately – constructed packet to exploit an error in the handling of queries for TKEY records. The vulnerability in BIND will crash and take down the BIND named daemon…
Continue readingTunnel 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 there is no VPN available to the remote network… Here is how to set up a RDP SSH tunnel with PuTTY.
Continue readingTurn off swap
How to turn off swap in Linux. Not every Linux server I administer needs to have a swap partition and to start swapping. For instance, the MySQL servers I maintain 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…
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.
Continue readingHow 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.
Continue readingConvert 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, B, C, D, E, F (or alternatively a-f) to represent values ten to fifteen. If you want to convert hexadecimal values to decimal and decimal values to hexadecimal, here’s how. All on the bash prompt…
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!