Sep 26, 2019
Your intentions are good, rotating your fail2ban log file. You are rotating your fail2ban log file, right? I mean, it’s not done by default for some weird reason so I’d forgive you if you aren’t. They get big and they should be trimmed and archived. If you’re already rotating your fail2ban log file or you’ve tried doing it in the past, did you ever notice that fail2ban stops using those rotated files? How rude! Let’s fix that.
Jun 23, 2019
Need to update a user’s UID/GID for whatever reason? Sometimes it’s just something you need to do when conforming with a new management scheme or when you’re moving to a new LDAP server, for example. This doesn’t have to be as difficult an undertaking as you might think.
Passwords are great and a strong password is definitely the first line of defense against unauthorized access. But, if you think your Facebook account is important enough to warrant another layer of security so people can’t hack pictures you posted about your lunch, then surely you can understand why your Linux console could use another security wrapper too, right? Let’s add second factor authentication (2FA) to your console, su, sudo and SSH access all in just a few easy steps.
Feb 23, 2019
For most of my Linux projects, and a lot of the tutorials on this site, I fire up a virtual machine on Hyper-V and load a minimal Debian system. Working with a Debian system gives me a stable, clean, platform I can easily customize as needed. If you were interested in a similar setup, here’s a walkthrough.
Feb 16, 2019
There are lots of times when you need a static IP, especially for server systems. It’s pretty simple on Debian, we only have to edit a few files and run a few simple commands.
Jan 30, 2019
certbot debian ubuntu letsencrypt security ssl certificate nginx
If you run a server of any kind, you know the importance of making sure your clients can securely connect. Many people rely on Let’s Encrypt since they issue free certificates that make these secure connections possible. However, those certificates are only good for 90 days and then have to be renewed… that’s a hassle! Enter Certbot…
Jan 22, 2019
debian ubuntu certificate security tls ssl certbot cloudflare certbot letsencrypt
Have a server that’s offering services that need to be secured with TLS but you can’t install a web server, can’t open port 80 or have something using that port you can’t shutdown? How do you get free Let’s Encrypt certificates? If you’re using Cloudflare for your DNS we can use certbot and automate the whole thing including renewals! If you’re using another DNS server provider, the basic process still works too.
Jan 18, 2019
debian ubuntu certificate security tls ssl certbot letsencrypt
There’s lots of instances where you need a certificate for a non-web server system. Popular examples of this include database servers, git-servers, docker-repos, etc. However, free providers like Let’s Encrypt usually validate your server by means of an HTTP lookup for a specific file and that means you need a way to serve that file but, we aren’t running a web server. Catch-22? Not necessarily…
Jan 15, 2019
If you’re running a Linux system, you need SSH access. It’s just a fact for any administrator. More over, you need quick, secure access with a minimum of security prompts. It’s not hard to get that set up and use the latest elliptical-curve security to boot!
Jan 15, 2019
Generating self-signed certificates is a common task that every admin needs to do from time to time for any number of reasons. Here’s how to make an OpenSSL configuration file to generate properly formed certificates quickly.
Jan 10, 2019
If you’ve been using Linux for any amount of time or even just getting your feet wet in the world of administering a Linux system, you’ve definitely seen references to ‘sudo’ or been told to use ‘sudo’ when executing certain commands. But, what is ‘sudo’, why should you use it and how do you install and set it up?
Nov 01, 2018
admin-tools administration debian ubuntu logs logwatch monitoring
Most every program you install and run, especially services, generate some form of log file and nearly everyone only checks those logs when something bad happens. Why? Because there are so many logs to check! Well, that’s where a log parsing program can be a lifesaver. I like using Logwatch on my Debian/Ubuntu systems. Logwatch is a nice, lightweight, easy-to-use program that generates a summary report that can be emailed nightly or on whatever schedule you choose.
Sometimes you’re running a server to provide a specific service and you need it to send you status updates via email but do NOT need the overhead and complexity of having it run a mailserver or complicated MTA.