Preface
Previously the deployment process at Avanti was largely adhoc, with no streamlined simple “touch of a button” system.
New code was usually deployed in such a manner :
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Tell load balancer to take down Server A, deploy new code on Server A (Server B handles all traffic).
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Tell load balancer to take down Server B(while getting Server A up again) and deploy new code on Server B.
There were obvious downsides to such a process, for one it required us to limit deployments to only low traffic periods (usually late at night) and required a lot of manual interference with the load balancer & servers.
So, we decided to build a seamless deployment system that would achieve the following things:
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Should trigger deployments with a simple “push of a button”
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Should cause minimum downtime
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Should be truly seamless (Absolutely no manual interference)
