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When building Terraform modules, it is a common requirement to want to allow the client to be able to choose which region resources are created in, and which availability zones are used. I’ve seen a few ways of doing this, none of which felt entirely satisfactory. After a bit of experimentation I’ve come up with a solution which I think really works nicely. This solution avoids having to know in advance how many availability zones we’ll support.

In this article I’m going to show you how to set up OpenShift to integrate with Splunk for logging in a Docker container orchestration environment. These techniques could easily be adapted for a standard Kubernetes installation as well! The techniques used in this article are based on the Kubernetes Logging Cluster Administration Guide. I also found Jason Poon’s article Kubernetes Logging with Splunk very helpful. First, clone the Terraform AWS OpenShift repo:

OpenShift is Red Hat’s platform-as-a-service offering for hosting and scaling applications. It’s built on top of Google’s popular Kubernetes system. Getting up and running with OpenShift Online is straightforward, as it is a cloud hosted solution. Setting up your own cluster is a little more complex, but in this article I’ll show you how to make it fairly painless. The repo for this project is at: github.com/dwmkerr/terraform-aws-openshift. Creating the Infrastructure OpenShift has some fairly specific requirements about what hardware it runs on1.

In this article I’m going to show you how to create a resilient Consul cluster, using Terraform and AWS. We can use this cluster for microservice discovery and management. No prior knowledge of the technologies or patterns is required! The final code is at github.com/dwmkerr/terraform-consul-cluster. Note that it has evolved somewhat since the time of writing, see the Appendices at the end of the article for details. Consul, Terraform & AWS Consul is a technology which enables Service Discovery1, a pattern which allows services to locate each other via a central authority.