DevOps

In the previous article we covered how to deploy an app using Docker Compose.  In this article we will expand upon that and push our files to a GitHub Repo and connect the Repo to Travis CI for continual testing.  Pre-reqs:Create a repository in Github – my example is docker-inferno Also, if you have not … Read more

I wasn’t expecting to get so in-depth into namespaces but I had another question come up.  What if you have multiple namespaces in your environment and you wanted to see them all.  Also, what if you were trying to find a particular pod in an unknown namespace. My previous namespace articles:https://digitalthoughtdisruption.com/2020/10/05/how-to-switch-between-namespaces-in-kubernetes/https://digitalthoughtdisruption.com/2020/10/02/kubernetes-create-namespace-with-default-quotas/https://digitalthoughtdisruption.com/2020/10/01/kubernetes-create-new-namespace-with-quotas/ How to see all … Read more

In my previous two articles I demonstrated how to create new namespaces with quotas.  However, someone asked is it possible to switch to the new namespace instead of always being in the default namespace.  Yes, yes you can. My previous two articles: As you can see when I issue the get pods commands it returns … Read more

Yesterday I posted a blog article around how to create a new namespace for a new deployment and apply quotas.  However, I immediately got several requests around is there an easier way to do this or apply quotas at the namespace level for all future pod creations.  Personal best practice; I like creating a yaml … Read more

There are times when projects and team members accessing the projects grow.  In order to keep these environments isolated we incorporate namespaces and to ensure these projects don’t exceed their resource limits we can impose quotas.   In this article I will provide a couple definitions followed by a two-step process.  In step 1, I will … Read more

As we continue to dig deeper and build off each article, I wanted to mimic a Test/Dev workflow leveraging Docker.  Below we will create an image and use Docker Compose to deploy the application in our Dev Environment.  In part 2. we will take the results of this blog and send to Travis CI for … Read more

In this article as we begin to progress forward with deploying containers I wanted to build on previous articles.  In this article we will create a package.json and server.js file, create a Dockerfile and see if our web app works. Now let’s create a directory for our project: $ mkdir <name_of_project>$ cd <DIR> Deploy web … Read more

I think Docker has the best explination of port mapping, “By default, when you create a container, it does not publish any of its ports to the outside world. To make a port available to services outside of Docker, or to Docker containers which are not connected to the container’s network, use the –publish or … Read more

In this article we will be covering building a simple custom Docker image.  Following creating this Docker image we will deploy a container.  Finally, we will add a couple more dependencies, add a tag, and re-deploy our final custom image. First let’s start with some Dockerfile basics:First word is an instruction that it tells the … Read more

Docker tags relay useful information about a specific image version.  Tags often than not look like “image_name:#” the part following the colon is your tag.  When you run the docker run command and the image is not local it will go download the latest version.  In our example, that would be ubuntu 20.04.1 but what … Read more

As you have seen from previous articles deploying a single container can be easy but what if we need to deploy multiple containers that need to communicate with each other?  Docker Compose is the tool you are seeking but first we have to install it. You can find the instructions here: First, let’s make sure … Read more

As I always say, the difference between a good engineer and a SME is repetitions.  Already in this back to basics series, we’ve covered Git, GitHub, and YAML files.  Now comes time to get familiar with Docker containers.  The best way to do this is to build your own lab.  There are a few ways … Read more

As we go through several of my DevOps series we will be writing in Python, JSON, & YAML. This is my preferred free tool to used to convert YAML into JSON or Python if the situation calls for it. Just copy & paste your YAML file into the left plane and at the bottom select … Read more

As we go through several of my DevOps series we will be writing and using YAML files. This is my preferred free tool to use to deploy YAML files with confidence. Copy & paste your .yml file into the left plane and click validate. This tool does a great job of identifying the exact line … Read more

As we go through several of my DevOps series we will be writing and using JSON files. This is my preferred free tool to use to deploy JSON files with confidence. Just copy and paste your JSON file and click Validate JSON and it will fix spacing errors or call out bad formatting. If you … Read more

As I always say, the difference between a good engineer and a SME is repetitions.  Already in this back to basics series, we’ve covered Git, GitHub, and YAML files.  Now comes time to get familiar with Docker containers.  The best way to do this is to build your own lab.  There are a few ways … Read more

There are going to come times when you want to be able to open your favorite text editor while working on an Ubuntu server. My favorite editor of choice is Visual Studio Code. This is a real quick and simple way to show you how to add the snap in. # apt-get install snapd# snap … Read more

As part of my back to basics series I thought I would create an article on base Docker container commands.  Obviously, there are a lot more ways to dig into the CLI but this is a good set of commands to start with. $ docker run -it <image name> This will allow you to go … Read more

As part of my back to basics series, I figured I should cover YAML files.  YAML will come in handy as we use Docker Compose and in the future when we cover Kubernetes.  In my future blog on using Docker Compose we will use the YAML file in the below example.  This article is supposed … Read more