posts tagged "ubuntu"

Setting up a Static IP on a Debian machine

Feb 16, 2019

debian ubuntu networking IP tcp-ip

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.

Automatically renewed free SSL certificates using certbot on Debian running NGINX

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…

Free SSL certificates using Cloudflare DNS validation and 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.

Free SSL certificates without a web server

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…

Setting up SSH with ED25519 user and host keys for easy, secure access

Jan 15, 2019

administration debian ubuntu ed25519 remote-access ssh sshd

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!

Proper self-signed certificates on Debian

Jan 15, 2019

debian ubuntu certificate self-signed security tls ssl

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.

Installing sudo on a Debian/Ubuntu system and understanding sudoers

Jan 10, 2019

admin-tools administration debian ubuntu sudo sudoers

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?

Easily monitor your logs using Logwatch

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.

Simple way to get email notifications from a linux server

Jun 30, 2018

debian ubuntu email msmtp notifications smtp mta

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.