| POSTGRES_PASSWORD | **mandatory** | This environment variable is required for you to use the PostgreSQL image. It must not be empty or undefined. This environment variable sets the superuser password for PostgreSQL. |
| POSTGRESQL_PORT | `5432` | |
| POSTGRESQL_MAX_CONNECTIONS | `100` | Set the maximum amount of connections. |
| REPMGR_NODE_ID | **mandatory** | Replication Manager node identifier (int), must be unique within cluster. |
| REPMGR_NODE_NAME | **mandatory** | Replication Manager node name, must be unique within cluster. |
| REPMGR_NODE_LOCATION | **mandatory** | Replication Manager node location, should identify the Availability Zone |