Wildcard SSL Certificates with Let’s Encrypt

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This tutorial shows you how to create a wildcard SSL certificate using Let’s Encrypt. Let’s Encrypt launched wildcard certificates in March 2018, so the process is relatively new.

Command Line, HTTPS, Let's Encrypt, Linux, Security, Server, SSL

New Vulnerability Found in Bash and How to Test

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A critical vulnerability has been found in Bash, which affects almost all Linux/Unix distributions that use or have it installed. Luckily, there is a easy way to test to see if your version is vulnerable using a command line.

Bash, Facebook, Linux, Mac OS, Security, Server

Creating SSH Shortcuts

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I often have to SSH into different servers, either to deploy new code or to carry out maintenance, so SSH shortcuts are an easy way of making the login process easier.

Linux, Mac OS, Server, SSH, Sysadmin, Tutorial

Backing Up MySQL Databases using Amazon S3

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Now you know how to back up your files and code to Amazon S3, but what about databases? Use this script to back up your databases to Amazon S3. You can even use it in a cronjob.

Amazon Web Services, Backup, Linux, MySQL, Security

Batch Resize Images on Linux Using Mogrify (ImageMagick)

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The Linux mogrify command (part of ImageMagick) is a handy way to compress / resize a image, or multiple images easily using the CLI. mogrify can also be used for convert or compress images.

CLI, Command Line, Linux, Server

Using Amazon S3 to Backup Your Server

7

Amazon S3 provides a cheap solution and easy to use solution to back up your Linux server or files on the cloud. The Linux s3cmd script lets you use rsync to backup folders and files easily.

Amazon Web Services, Backup, Linux, Security

Syncing Servers using Rsync

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A while ago I had to sync files from one server to another. The reason? I was responsible for moving all the application and websites hosted on a old server to a new, faster server with better security and a updated operating system.

Linux, Server

Finding large files on Mac / Linux

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I recently ran into a problem with disc space on my Mac, requiring me to find and delete large files to free up some space quickly. I found the following command (in Terminal) very useful to find large files of a given size in a given directory.

Command Line, Linux

Using .htaccess Files to Show Maintenance Page

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When it comes to updating a database or your code in a production environment, or even migrating code between old and new servers, you don’t want someone accessing your files during your deployment procedure.

Apache, Deployment, Linux, Tutorial

Useful Linux Commands

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Managing a server using SSH and Command Line Access over the past few years has taught me a lot. It’s sometimes important to check how a server is doing in terms of load or you may simply want to check hard disk usage.

Linux, Server, Sysadmin