HealthCheck for hardware loadbalancers
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Key: AMQ-2829
URL: https://issues.apache.org/activemq/browse/AMQ-2829
Project: ActiveMQ
Issue Type: New Feature
Environment: ALL
Reporter: Dirk Alexander Schäfer
Priority: Minor
hi there,
we had the problem that we were not able to integrate our network of brokers in
our cluster setup where a hardware loadbalancer was in front of the cluster. as
the loadbalancer needs to run health checks against each node in the cluster,
we needed to find a way to offer an endpoint the loadbalancer could send its
probe requests to.
we decided to develope a little web application that returns "pong" if the jms
provider is available, "offline" else. we've created a webapp that can be
deployed in the jetty that comes with activemq. i attach the whole eclipse
project ziped to this issue. i haven't cleaned it so it will not fitt into the
activemq package hierarchy but it should be enough to get an idea of how we did
it. i also attach the modified jetty.xml were we added the webapp in order to
become it loaded.
it might look a bit oversized as it is based upon spring web mvc, spring
security and tiles but our intention was to be able to put further
administrative functionality into the web app once needed.
how it works: a consumer as well as a producer are being created during the
startup of the app. the consumer makes sure that messages get dispatched and do
not fill the queue, allthough the messages are marked none-persistence and have
a ttl of 5 secs, just to be sure. if a check request comes in
(/lbProbe/ping.htm) the app tries to put a message into the queue (the queue
name is configurable through spring). if this succeeds, the OK-result will be
returned, otherwise the NOT-OK-result. both are configurable through spring.
known bugs: if one deletes the queue the app is using through e.g. the admin
web app, the check will strill return OK.
things to beware of: the name of the queue the webapp uses should be configured
in the excludes of the networkConnector settings ;)
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