Playing with Elephants ~PostgreSQL and Pgpool-II~

In my previous blog post , I have introduced how to monitor Pgpool-II and PostgreSQL cluster using Pgpool-II Exporter. As I mentioned in the previous post, Pgpool-II Exporter exposes metrics that Prometheus can collect. Prometheus is one of the most popular monitoring tools used on Kubernetes. In this post, I would like to introduce how to deploy Pgpool-II and Pgpool-II Exporter on Kubernetes. Architecture A PostgreSQL operator is required to manage PostgreSQL clusters on Kubernetes. Therefore, you need to combine Pgpool-II with a PostgreSQL operator. Below is the architecture: Prerequisites Before you start deploying Pgpool-II, please check the following prerequisites: Make sure you have a Kubernetes cluster, and kubectl is installed. PostgreSQL Operator and a PostgreSQL cluster are installed. In the blog, I used the PostgreSQL Operator Crunchy PostgreSQL Operator to create a PostgreSQL cluster. Deploy Pgpool-II and Pgpool-II Exporter We deploy the Pgpool-II pod that contains a P