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While we build our open source, cloud agnostic Heroku/Cloud Foundry-like Paas - Pipeline - on top of Kubernetes, we continue to launch lots of clusters on different cloud providers. Most of these clusters are launched on spot or preemptible instances, and managed by Hollowtrees. However, there are many smaller development clusters, control planes, instances and PoCs we launch that are marginally related to, or launched with, Pipeline. Naturally, these have an associated cost that we want to keep tight control over.

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Hollowtrees is a wave of highest pedigree, the pin-up centerfold of the Mentawai islands’ surf break which brings new machine-like connotations to the word perfection. Watch out for the aptly named ‘Surgeon’s Table’, a brutal reef famous for taking bits and pieces of Hollowtrees’ surfers as trophies. Hollowtrees, a ruleset based watch-guard keeps spot instance-based clusters safe and allows for them to be used in production. It handles spot price surges within a given region or availability zone and reschedules applications before instances are taken down.

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Cloud cost management series: Overspending in the cloud Managing spot instance clusters on Kubernetes with Hollowtrees Monitor AWS spot instance terminations Diversifying AWS auto-scaling groups Draining Kubernetes nodes Cluster recommender Cloud instance type and price information as a service One of the primary advantages always discussed in the context of deciding whether to move a deployment to the cloud is cost. There are no upfront costs in moving to the cloud because you don’t have to buy any hardware, and you only pay for what you really use because you can scale your infrastructure according to your workloads.

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