Following are the details to use
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You must have following group in inventory - ( frontends, apps, appdbs )
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add host to above groups
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frontends group will have host where we want to install HAproxy
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apps group will have host where we want to install httpd/tomcat
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appdbs group will have host where we want to install postgressql
To run
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git clone https://github.com/miteshrh/multi-tier-application.git
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cd multi-tier-application
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ansible-playbook main.yml -e GUID=<your guid>