DNS Round Robin is the concept that you can have two different hosts with DNS Aliases that respond to the same DNS Name. Where might you find something like this? Consider a service like Instagram. They need more than one server to provide their service, yet users always go to the same Instagram.com domain to […]

This tutorial will explore learning about and testing DNS in Docker. DNS works a little differently depending on if you are using custom or default networks in your environment. Good working DNS is important with containers since you can’t rely on IP addresses in containers because containers are very dynamic. Containers tend to be ephemeral […]

Docker makes it fairly easy to set up virtual networking in a local environment. In fact, in using Docker to this point, we haven’t had the need to tinker with any network settings as typically the network portion of Docker “Just Works”. In other words, the defaults provided are common to work with but you […]

At this point, we are pretty familiar with getting containers running in Docker and how to monitor them from the cli or Docker desktop. Now we want to look at how to connect to a docker container while it is running. Connecting to a docker container is similar to how you would SSH into a […]

This tutorial will focus on seeing what is going on inside the containers you are running. There are several docker commands to do this with the most common ones being docker container top, docker container inspect, and docker container stats. The top command is a process list in one container. The inspect command is quite […]

Once you learn how to get a container up and running in Docker, you can then move on to running and managing multiple containers in the same docker engine for your environment. Much like anything else, practicing setting up containers, interacting with them, and tearing them down once done will get you comfortable with the […]

MongoDB is a document-based NoSQL database that is good for high volume data storage. Rather than using tables and rows like traditional relational databases, MongoDB makes use of Collections and Documents. The documents consist of key-value pairs which are the basic unit of data in MongoDB. In this tutorial, we’ll use Docker to launch a […]