# postgres-explain-visualizer role

This role installs [pev2](https://github.com/dalibo/pev2) (PostgreSQL Explain Visualizer) alongside a
[flask app](https://github.com/dalibo/explain.dalibo.com) to store and share `EXPLAIN ANALYSE` results.

Gunicorn is also installed to serve the flask app and make it production ready.

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* [postgres-explain-visualizer role](#postgres-explain-visualizer-role)
  * [Variable reference](#variable-reference)
    * [Mandatory variables](#mandatory-variables)
  * [Upgrade](#upgrade)
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## Variable reference

### Mandatory variables

| Variable | Description     | Example value        |
|----------|-----------------|----------------------|
| pev_fqdn | The host's fqdn | `explain.cosium.com` |

## Upgrade

Launch this role with `-e pev_update_now=true` or `-e global_update_now=true`