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Add order in which on premise services have to come up. #590

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Add order in which on premise services have to come up. #590

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30 changes: 29 additions & 1 deletion worker/on-premise/quickstart.md
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Expand Up @@ -181,4 +181,32 @@ Surf to http://$IP_OF_ELK_HOST:5601/ , then change the text field that shows up

## Metrics

TODO:
Instructions will be added soon.

## Restarting hosts or services

The installer sets up all services to use _systemd_ and sets them to launch at
boot. systemd will also attempt to restart them on failure. Some services have
dependencies on each other. The IronWorker installer is not an orchestration
tool and cannot manage this ordering if hosts have to be restarted. Here is the
dependency tree of host ordering. Items in the same list are independent of
each other and can be started together.

1. If an ELK setup is present, start this first. Proceed after ELK is
completely operational.
2. statsd/Graphite setup if any.
3.
* MongoDB
* PostgreSQL
* Minio
4. Any optional Docker registries.
5. IronAuth.
6. Load balancer for IronAuth if any.
7. IronMQ.
8. Load balancer for IronMQ if any.
9. IronWorker (swapi).
10. Load balancer for IronWorker if any.
11.
* Scheduler
* Operational tools
* All runners