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technical_requirements.md

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Technical Requirements

General Prerequisites

To try out a8s you will need:

  • a running Kubernetes cluster (for the size we recommend considering the estimated resource consumption of a8s)
  • kubectl v1.14 or higher pointed to the Kubernetes cluster
  • one StorageClass marked as default in the Kubernetes cluster
  • one AWS S3 bucket for storing Backups

If you want your data service instances to have IPs reachable from outside the K8s cluster (by using the feature described here), the K8s cluster must support external load balancers.

To access the included Dashboards (Grafana, OpenSearch Dashboards) it is also recommended to deploy an Ingress Controller on your cluster. To access the Dashboards you can then expose the Dashboard Services, for more information on the process, consult the Kubernetes Ingress Documentation.

The instructions in this repo have been tested on Kubernetes v1.20, v1.21, v1.22 and v1.23 on minikube, and on Kubernetes v1.22 on EKS, but they should work with any recent Kubernetes version. Please let us know if you encounter any issue with other versions.

Resource Consumption Estimates

The purpose of this section is to provide a rough estimate for the resources that the components of a8s will consume. These numbers are obtained under only a minimal load (only a8s and a single PostgreSQL DSI on the cluster) and therefore can vary heavily depending on the workloads on your cluster, especially the resource consumption of the logging and metrics components.

Component CPU (cores) Memory (MiB)
a8s Control Plane
a8s Backup Controller Manager v0.3.0 0.005 22
a8s Service Binding Controller v0.2.0 0.004 22
Postgresql Operator v0.7.0 0.004 20
Total 0.013 64
a8s Logging Framework
Fluent Bit (DaemonSet) 0.002 per node 6 per node
FluentD 0.013 95
OpenSearch 0.021 1000
OpenSearch Dashboards 0.002 130
a8s Metrics
Grafana 0.003 35
Prometheus 0.045 360
PostgreSQL DSI
Single PostgreSQL Pod (no load) 0.003 130

Likely, you are already running more recent versions of the a8s control plane components than those that have been used to obtain these numbers. But, we expect the numbers to have changed only marginally.