An automation journey
In this case I was trying to identify which DNS resolver would be the best for my infrastructe in remote sites. Usually configuring 8.8.8.8 would be ok, yes is simple, but there are a couple of things going on in the background that deserves some checking if you want to achieve best performance. Which was …
Last year was an incredible journey with my network automation projects! I had the opportunity to simplify Network Operations and gain valuable visibility at a low cost by leveraging cloud services to run the code. Welcome to the world of NetDevOps! This time around, I won’t give code details, but I’ll share some of the …
In my previous 2 posts I played around Linux Networking with the module iproute2. How to configure 1 Linux host with 2 NICs and 2 default gateways How to setup 2 network isolated Docker containers (front-end and back-end) Now that pure routing is done, the next step is iptables, as a Firewall module. I’ve to admit …
Making this work might sound crazy, but if Docker has to be comparable in functionalities already provided by other types of virtualization, then this has to work right? Ok, this is the scenario, is a classic one: I need to deploy in one Docker host, 2 isolated containers, let’s say front-end and back-end. The Linux …
Historically, it was not possible to have 2 default gateways in a Linux host. You can SEND traffic to both NICs, but the reply will always come from the NIC which has the default gateway. This will generate asymmetric traffic and it will be denied in the network or by the originating host. Asymmetric traffic …
Some time ago I was asked for help to develop a “simple and quick” Python script to monitor the status of a Linux service. They were in the middle of a deployment and they needed something fast. They added, keep the result in a JSON file with the date, serve the directory with HTTP for …