Etcd auto defrag, Performance etcd provides strongly consistent read and write access Sep 25, 2023 · Walkthrough Managing defragmentation in Amazon EKS The underlying etcd cluster and its defragmentation process are handled transparently by the Amazon EKS control plane. Defragmentation operation removes the free space holes from the storage. Failure to adequately control the keyspace size is guarded by storage space quotas; if an Mar 27, 2017 · What metrics should be used to monitor fragmentation? This is actually about disk fragmentation. @xiang90 That just means no fragmentation will not influence the performance of etcd cluster but only no more disk space freed? When the amount of data reaches the quota and cannot be written, the capacity can be reduced by manual compaction (etcdctl compact) and defragmentation (etcdctl defrag). Mar 7, 2018 · etcd can be set to automatically compact the keyspace with the --auto- compaction option with a period of hours: # keep one hour of history $ etcd --auto-compaction-retention= 1 Apr 4, 2023 · I see there is env variable to schedule auto compaction but cant find one for auto defragmentation. How important to have defragmentation after auto compaction?. It is strongly recommended to perform these operations on the nodes of the etcd cluster one by one, otherwise the entire etcd cluster may become unavailable. yaml Example (Bitnami Helm Chart) bitnami/etcd Helm chart supports both auto compaction (based on flag ETCD_AUTO_COMPACTION_*) and defragmentation. When etcd needs defragmentation? The Cluster API and kubelet certificates have expired, resulting in the inability to create any new requests on the etcd cluster. Amazon EKS employs automated maintenance processes to ensure the health and stability of etcd. Depending on an etcd application’s needs, this maintenance can usually be automated and performed without downtime or significantly degraded performance. But if you do not suddenly remove a lot of keys and want to reclaim the disk space immediately, you do not need to defrag. Note that it ignores the NOSPACE alarm run defragmentation on the leader last support rule based defragmentation etcd-defrag An etcd cluster needs periodic maintenance to remain reliable. All etcd maintenance manages storage resources consumed by the etcd keyspace. yaml: Nov 7, 2025 · etcd-defrag Table of Contents Overview Integration with Kubernetes with a CronJob Examples Example 1: run defragmentation on one endpoint Example 2: run defragmentation on multiple endpoints Example 3: run defragmentation on all members in the cluster Defragmentation rule Auto-disalarm Feature Container image Contributing Note Overview etcd-defrag is an easier to use and smarter etcd Aug 17, 2024 · Auto Compaction etcd can be set to automatically compact the keyspace with the --auto-compaction-* option with a period of hours: Sep 24, 2023 · Overview An etcd cluster needs periodic maintenance to remain reliable. It references the implementation of etcdctl defrag command, but with big refactoring and extra enhancements below, check the status of all members, and stop the operation if any member is unhealthy. Oct 20, 2025 · This KB will help to defragmentation the etcd database size. When you run etcdctl command from control plane VM to get endpoint status (etcdctl endpoint status -w ) it would report " alarm Mar 22, 2025 · Install with: kubectl apply etcd-defrag-cronjob. File values. What are the steps to compact and defrag the etcd database in OCP 4. Failure to adequately control the keyspace size is guar Feb 9, 2026 · Learn how to compact and defragment etcd databases to reclaim disk space, improve performance, and maintain healthy Kubernetes cluster storage with automated maintenance procedures. The latter is implemented through a CronJob template. Symptoms: kube-api-server logs would contain " etcdserver: mvcc: database space exceeded " which indicates storage space exhaustion. AWS takes care of provisioning, scaling, and managing the etcd instances for you. Depending on an etcd application’s needs, this maintenance can usually be automated and performed without downtime or significantly degraded performance. The following example configure the defragmentation cron job to run every minute. etcd-defrag is an easier to use and smarter etcd defragmentation tool.
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