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What are the NuoCA pre-requirements?

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The NuoCA requirements are:

• Python 2.7 - License
• Python pip - License
• Python libraries contained in requirements.txt:
  • aenum - License
  • pallets click - License
  • Elasticsearch - License
  • python-dateutil - License
  • PyPubSub - License
  • PyYaml - License
  • requests - License
  • wrapt - License
  • Yapsy - License
• NuoDB (for any of the Nuo* plugins)
• Logstash 5.x, if using the NuoAdminAgentLog or Logstash plugin - License
• Zabbix 2.2 (or later),  If using the Zabbix plugin - License
• ElasticSearch 5.x, if using the ElasticSearch plugin - License

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