Rolling updates for websites hosted on Amazon's Elastic Beanstalk -

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i've deployed application elastic beanstalk, , configured rolling updates feature. sounds pretty cool because keeps number of servers in farm @ times while others swapped out upgrades - seems outage-less upgrade achievable.

but reasoning isn't going work - @ point during rolling update there servers v1 on , servers v2 on. if js or css different between v1 , v2 there v1 page loaded sends request load balancer , gets v2 js/css , vice versa.

i can't think of easy way avoid this, , i'm struggling see point of rolling upgrades @ all.

am missing something? there better way achieve outage-less upgrade website? thinking set complete parallel elastic beanstalk environment v2 on it, , switch them on in 1 go - seems more time consuming.

as described, use rolling deployments , have continuous deployments on same environment, need guarantee version n compatible version n+1. "compatible" meaning can run simultaneously, can challenging in cases such different files , database schema changes.

a popular workaround blue-green deployments, deploy different environment , redirect users. swap url feature helps implement using aws elastic beanstalk.

progressive rollouts , blue-green not mutually exclusive. can use progressive rollouts small changes , blue-green bigger ones. more patterns , techniques on continuos delivery, i'd recommend check jez humble's book.


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