How to automatically scale up and scale down of micro services instances built using Spring Boot and Spring cloud?
I didn't find much info about this on web.
please help in understanding the possible approaches
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That's up to the platform you are running on, like cloud foundry or kubernetes – spencergibb Jan 28 '18 at 05:39
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If this is not provided by your environment (i.e. AWS Lambda) then you probably have to do it yourself.
For this you need a method of programatically scaling up/down the microservices (i.e. docker service scale xyz=2) and a meaning of determining that a service needs scaling up/down. For this you need to be able to read the relevant metrics from the microservice and a scaling controller that use those metrics to compute the scaling reguirements. For example, if the CPU usage is at least 90% for at least 5 seconds then scale up, if the CPU is less than 10% for at least 5 seconds then scale down.
You can even design the microservice to report its own metrics to the controller for more business specific metrics.
Constantin Galbenu
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