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A comment on We use Kubernetes and spot instances to reduce EC2 billing up to 80%. Parent comment

Re:We use Kubernetes and spot instances to reduce EC2 billin... by threeseed on Monday February 24, 2020 @11:20PM (#22410888)
I can't speak for the other regions but in ap-southeast-2 we had a couple of incidents in 2019 where there was no Spot capacity for ANY instance types between say 64GB and 512GB of RAM.

And so even our instance fleets were failing to provision capacity.

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Re:We use Kubernetes and spot instances to reduce EC2 billin... by ramraj07 on Tuesday February 25, 2020 @04:02AM (#22411781)
Requiring a minimum of 64GB RAM seems quite unique computationally, so if it's mission critical that you have at least one instance of this type all the time up, then maybe you could reserve that one instance fully while depending on spots for scaling?
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Re:We use Kubernetes and spot instances to reduce EC2 billin... by tuananh on Tuesday February 25, 2020 @12:00AM (#22411027)
this is why ability to fall back to on-demand instances is critical.
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Re:We use Kubernetes and spot instances to reduce EC2 billin... by londons_explore on Tuesday February 25, 2020 @03:14AM (#22411617)
When there are no spot instances, it's common that on-demand instances can't be started either.

Unless you paid for a reservation, you're SOL.

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Re:We use Kubernetes and spot instances to reduce EC2 billin... by maniktan on Monday March 02, 2020 @05:29PM (#22469749)
Fwiw, Product@SpotInst here. Curious what makes you arrive at this conclusion? At SpotInst we have customers who migrate between Spot <--> RI <--> OD everyday.
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Re:We use Kubernetes and spot instances to reduce EC2 billin... by tuananh on Tuesday February 25, 2020 @03:29AM (#22411672)
that's for you to decide how many percent of reserved instances out of total compute power you need. it's always a trade off. in that case, pct of cost saving is lower but availability is higher.
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Re:We use Kubernetes and spot instances to reduce EC2 billin... by paulddraper on Tuesday February 25, 2020 @12:33AM (#22411147)
It seems weird that AWS wouldn't just do this automatically, right?
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Re:We use Kubernetes and spot instances to reduce EC2 billin... by llarsson on Tuesday February 25, 2020 @12:48AM (#22411193)
Yes and no. Because they do not want to disclose how much capacity they have and on demand costs more, customers would be left wondering if AWS unfairly decided to run on demand when spot could have been used instead.
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