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juju set logstash logstash-source="https://download.elasticsearch.org/logstash/logstash/logstash-1.4.2.tar.gz" logstash-sum="d59ef579c7614c5df9bd69cfdce20ed371f728ff"
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There is also a configuration option to add arbitrary packages pre-installation of logstash. The format is a space separated list.