SEP 12 (PR #16) Accepted

accepted/0012-update-engines-without-minion-restart.md

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+- Feature Name: update-engines-without-minion-restart
+- Start Date: 2019-07-16 
+- SEP Status: Accepted
+- SEP PR: https://github.com/saltstack/salt-enhancement-proposals/pull/16
+- Salt Issue: 
+
+# Summary
+[summary]: #summary
+
+Being able to restart minion engines without having to restart the minion itself.
+
+# Motivation
+[motivation]: #motivation
+
+As a user I need to run a new engine on a minion, but restarting the minion needs to be done carefully and may not happen when I need it.
+This is already possible with beacons.
+
+# Design
+[design]: #detailed-design
+
+The engine configuration could be either in the configuration or in the pillar.
+When refreshing the pillar, loop over the engines configuration and start or stop the engines according to the new configuration.
+
+## Alternatives
+[alternatives]: #alternatives
+
+The alternative is to manually restart the salt minion, with all the problems this can bring.
+
+## Unresolved questions
+[unresolved]: #unresolved-questions
+
+If this is too problematic to run on every pillar refresh, then an additional function could be provided to only refresh the engines.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+The engines documentation would need to add this new possibility to configure the engines using pillar.