By Pablo Acuña
This concise teaches you ways to take advantage of the facility of Docker and Kubernetes to set up your Rails functions simply and successfully. Docker and Kubernetes are expanding in acceptance on a daily basis, yet what so one can leverage their merits on your Rails software? this can be the e-book you need.
Deploying Rails with Docker, Kubernetes and ECS shows you ways to establish the undertaking, push it to DockerHub, deal with providers and organize a good non-stop integration atmosphere. each suggestion is obviously defined along a whole Ruby on Rails program deployment. You’ll additionally tips on how to install through Docker utilizing Amazon EC2 box Service.
What you are going to Learn
- How to create a Rails API program utilizing Rails five and PostgreSQL, and Dockerize it
- How to jot down and try out templates to run the appliance with Kubernetes
- How to create a Kubernetes cluster in Amazon net providers and run your
- How to examine and troubleshoot difficulties within the cluster
- How to automatize the the total deployment technique with Jenkins
Who This e-book Is For
This publication is for an individual who desires to know the way to successfully set up a Rails program utilizing Docker and Kubernetes. it is important to comprehend Rails and feature uncomplicated wisdom of what Docker and Kubernetes are used for.
Read or Download Deploying Rails with Docker, Kubernetes and ECS PDF
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Extra info for Deploying Rails with Docker, Kubernetes and ECS
Pablo Acuña 2016 P. 1007/978-1-4842-2415-1_3 27 Chapter 3 ■ Kubernetes Main Objects Pods The pod is the first level of abstraction in Kubernetes. It’s just one level above the container. The difference is that you can have several containers running in the same pod. In general, I do not recommend that you do this unless it’s a very specific case in which it actually makes sense. Generally, you want to have one container per pod. For our application, we’ll use different pods for our web app and for PostgreSQL.
Just what we wanted. If you want to make sure the container died, you can list the pods with $ kubectl get Pods Output: NAME READY STATUS RESTARTS AGE postgres-1747921911-h516t 1/1 Running 0 10m info: 1 completed object(s) was(were) not shown in Pods list. Pass --showall to see all objects. Just the PostgreSQL Pod and one completed pod, which was the migrate job. Now, let’s run the last piece, the web application. yaml Output: service "webapp" created deployment "webapp" created Don’t worry if you get a warning about port security.
This means that we want to kill all the existing pods for this deployment before launching new ones. If you don’t specify a strategy, the deployment will use a default, which is RollingUpdate. RollingUpdate won’t kill the old Pods before launching the new ones, so you can better control your update process. That works well with web applications, but you can see why it would be a problem when using containers for something like databases. You don’t want to have two copies of the same database container running at the same time.