ER Model

The largest entity concept in Pigsty is a Deployment. The main entities and relationships (E-R diagram) in a deployment are shown below:

A deployment can also be understood as an Environment. For example, Production (Prod), User Acceptance Testing (UAT), Staging, Testing, Development (Devbox), etc. Each environment corresponds to a Pigsty inventory that describes all entities and attributes in that environment.

Typically, an environment includes shared infrastructure (INFRA), which broadly includes ETCD (HA DCS) and MINIO (centralized backup repository), serving multiple PostgreSQL database clusters (and other database module components). (Exception: there are also deployments without infrastructure)

In Pigsty, almost all database modules are organized as “Clusters”. Each cluster is an Ansible group containing several node resources. For example, PostgreSQL HA database clusters, Redis, Etcd/MinIO all exist as clusters. An environment can contain multiple clusters.

• PostgreSQL Cluster
• ETCD Cluster
• MinIO Cluster
• Redis Cluster
• INFRA Nodes