Databases On Kubernetes: Why You should care

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Couchbase 2017. All rights reserved. DATABASES ON KUBERNETES Denis Rosa | Developer Advocate @deniswsrosa @deniswsrosa WHY YOU SHOULD CARE

Couchbase 2017. All rights reserved. @deniswsrosa Databases typically have numerous tuning parameters, a new immutable container image for every possible database configuration can quickly result in image sprawl.

Couchbase 2017. All rights reserved. 20 DBaaS vs Databases on K8S • Easy; • Low TCO for small/medium workloads*; • Lacks flexibility*; • Average performance; DBaaS DB on K8S • Still requires some K8s knowledge; • Same flexibility as bare metal; • Operators can automate most of the hard work; • One of the best options for databases with large number of nodes; • Potentially the default option in the near future;

Couchbase 2017. All rights reserved. 22 Kubernetes Storage https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads Ephemeral Remote Persistent Local Persistent Easiest one, but you lose all data if the pod gets killed. Latency limits the performance of applications with intensive read/write profiles or distributed datastores Not a general purpose storage solution

Couchbase 2017. All rights reserved. 24 Local Persistent Storage - Trade offs https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads • Inflexible placements • Lower availability • Lower data durability (not replicated) • Requires Node/disk preparation

Couchbase 2017. All rights reserved. 25 Local Persistent Storage - Trade offs https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads It is ok for databases as they already have data replication internally

Couchbase 2017. All rights reserved. 26 Host Path vs Local Persistent Storage https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads Allows your pod to specify any path in your disk Not portable Not disk accountable Hard to use at scale Host Path

Couchbase 2017. All rights reserved. 27 Host Path vs Local Persistent Storage https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads Leverages the persistent volumes interface Security: Only adms can create/define the content of the PVs Portability Disk accountability StatefulSets Local Persistent Storage

Couchbase 2017. All rights reserved. 28 Bare Metal Vs Containers https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads Yahoo! Cloud Serving Benchmark YCSB includes a set of core workloads that define a basic benchmark for cloud systems

Couchbase 2017. All rights reserved. 29 Workload A https://blog.couchbase.com/performance-certification-of-couchbase-server-5-5-on-kubernetes-platform/ Workload A Update heavy workload: Mix of 50/50 reads and writes Workload E Short ranges: Short ranges of records are queried, instead of individual records. ~0% No substantial difference <10% Performance penalty

Couchbase 2017. All rights reserved. 32 Bare Metal Vs Containers https://blog.couchbase.com/performance-certification-of-couchbase-server-5-5-on-kubernetes-platform/ Worst Case: Add an extra node to compensate for potential performance penalties

Databases On Kubernetes: Why You should care

Databases On Kubernetes: Why You should care

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