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From "Stephan Erb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AURORA-761) Provide a proxy for generic service discovery
Date Thu, 19 Mar 2015 10:11:38 GMT

    [ https://issues.apache.org/jira/browse/AURORA-761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368806#comment-14368806
] 

Stephan Erb commented on AURORA-761:
------------------------------------

FYI, we ended up doing the following:

* Deploy the patched synapse gem by [~benley] to each slave (thanks!)
* Synapse requires us to maintain a list of aurora services that shall be exposed via fixed
HAProxy endpoints. The services deployed in our cluster are highly dynamic. We therefore opted
to start one synapse/haproxy pair per aurora service within the same container as the service
itself. The synapse config is generated to contain all external services needed by the primary
service in the container.
* Expose the HAProxy endpoints to the primary service using environment variables
* Rewire the incoming health checks to /health to pass through haproxy to make sure it remains
operational (as it is running in the background and cannot be monitored by thermos)

> Provide a proxy for generic service discovery
> ---------------------------------------------
>
>                 Key: AURORA-761
>                 URL: https://issues.apache.org/jira/browse/AURORA-761
>             Project: Aurora
>          Issue Type: Story
>          Components: Service Discovery, Usability
>            Reporter: Bill Farner
>            Priority: Minor
>
> While {{Announcer}} provides service registration, we lack a cross-cutting answer for
service discovery.  There are well-known libraries that will do it (e.g. finagle), but we
need an answer for others.  Marathon, for example, provides a script called {{haproxy_marathon_bridge}}
that reloads configuration of HAProxy for this purpose.  We could do something similar with
a mixin {{Process}} that dynamically routes an inbound port to a serverset path in ZooKeeper.



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