# Zalando Helsinki

Published articles for Zalando Helsinki.

This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles.

## Failing to Auto Scale Elasticsearch in Kubernetes

DevFeed: [Failing to Auto Scale Elasticsearch in Kubernetes](<https://devfeed.tech/articles/failing-to-auto-scale-elasticsearch-in-kubernetes-47473.md>)

Original publisher: [Read original article](<https://engineering.zalando.com/posts/2024/06/failing-to-auto-scale-elasticsearch-in-kubernetes.html>)

Author: Juho Vuori

Published: 2024-06-20T22:00:00Z

Content type: article

Language: en

Sources: [Zalando](<https://devfeed.tech/sources/zalando-engineering-blog.md>)

Topics: [elasticsearch](<https://devfeed.tech/topics/elasticsearch.md>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [Scalability](<https://devfeed.tech/topics/scalability.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [Amazon Web Services](<https://devfeed.tech/topics/aws.md>)

Tags: [availability](<https://devfeed.tech/tags/availability.md>), [backend](<https://devfeed.tech/tags/backend.md>), [cluster](<https://devfeed.tech/tags/cluster.md>), [culture](<https://devfeed.tech/tags/culture.md>), [elasticsearch](<https://devfeed.tech/tags/elasticsearch.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [logs](<https://devfeed.tech/tags/logs.md>), [on-call](<https://devfeed.tech/tags/on-call.md>), [operational](<https://devfeed.tech/tags/operational.md>), [pod](<https://devfeed.tech/tags/pod.md>), [root-cause-analysis](<https://devfeed.tech/tags/root-cause-analysis.md>), [scale](<https://devfeed.tech/tags/scale.md>), [schedules](<https://devfeed.tech/tags/schedules.md>), [sre](<https://devfeed.tech/tags/sre.md>), [statefulset](<https://devfeed.tech/tags/statefulset.md>), [zalando](<https://devfeed.tech/tags/zalando.md>), [zalando-helsinki](<https://devfeed.tech/tags/zalando-helsinki.md>)

### AI overview

An operational postmortem describes a failed scheduled scale-down of an Elasticsearch cluster running in Kubernetes. Zone-awareness settings prevented shard relocation from the only node in one availability zone, leaving the cluster with an unexpected node count and causing a later scaling alert.

### Source excerpt

A story of operational failure in large scale Elastisearch installation including the root cause analysis and mitigations that followed