Posted inGNU Linux
How to display longer username in `ps`
Display full username in ps. The ps output truncates usernames to 7 characters and a +. If you need the full username in Bash ps, here is how.
Posted inGNU Linux
Force HSTS in Apache .htaccess
Learn how to enable HSTS (HTTP Strict Transport Security) in Linux Apache .htaccess. I wrote about enabling HTTP Strict Transport Security (HSTS) in IIS earlier. But what about enabling HSTS in Apache .htaccess? Here is how.
Posted inGNU Linux
Bash function to generate a random alphanumeric string
Create a random string in Bash easily. You can use this Bash function in your .bashrc file to generate a random string of alphanumeric characters. This comes in handy when you need to generate a long, secure password for example. Adjust to your needs.
Posted inGNU Linux
Release hold queue email in Postfix – postsuper
Flush and delete the hold queue in Postfix or delete all mail from the deferred queue with Postfix postsuper command as explained in this post.
Posted inGNU Linux
Recursive scp and symlinks
Recursive scp without following symbolic links. 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!
Posted inGNU Linux
Install Varnish Cache on CentOS 6.7
How to install and configure Varnish Cache on CentOS. 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.
Posted inGNU Linux
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.
Posted inGNU Linux
Generate pseudo-random passwords with OpenSSL
Use OpenSSL to generate pseudo-random strings to be used as passwords. Passwords for users, system accounts and service accounts. I provide you examples for Linux (Bash), Windows and PHP.
Posted inGNU Linux
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 all 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.
Posted inGNU Linux Windows Server
Redirect HTTP to HTTPS
Various HTTP to HTTPS redirection methods, for Windows Server IIS and Linux Apache.
Posted inGNU Linux
Monit monitoring on Ubuntu 14.04 VM on Hyper-V
Set 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.
Posted inGNU Linux
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.
Posted inGNU Linux
Convert decimal to hex in Bash?
Convert decimal to hex, hexadecimal to decimal and convert Unix timestamps to dates in Bash. Learn to convert something in Bash.
Posted inGNU Linux
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 DigitalOcean. DIY High-Availability for your website!
Posted inGNU Linux
How to delete all MAILER-DAEMON emails in Postfix queue
Delete all MAILER-DAEMON emails from your Postfix queue fast when it matches a sender or recipient email address condition. For example, delete emails based on Message-ID header, To or From address.