a9s KeyValue

This documentation describes the a9s KeyValue. a9s KeyValue enables on-demand provisioning of VM(Virtual Machine) based, dedicated Valkey servers. Developers can create instances of a Valkey server using Apps Manager or the Cloud Foundry Command Line interface (cf CLI) and bind these instances to an app.

Overview

When you run the cf CLI cf create-service a9s-keyvalue command, BOSH creates dedicated VMs for this service instance. This allows the best possible bad neighborhood protection.

Valkey service instance provisioning, including VM orchestration, is entirely automated. This enables service instances to be highly isolated and shielded by infrastructure virtualization mechanisms.

Due to the on-demand provisioning on VMs, only existing service instances allocate infrastructure resources. These resources are released when service instances are destroyed. Using on-demand provisioning the number of service instances is not limited by design.

Current Features

The current version of a9s KeyValue includes the following key features:

Feature	Benefit
On­-Demand Service Instance Provisioning	a9s KeyValue deploys valkey instances automatically. Developers can provision a single-VM Valkey server using a single command.
Service Instance Isolation	Each valkey server runs on a dedicated VM to ensure bad neighborhood protection in order to be aligned with enterprise security requirements. a9s KeyValue uses Cloud Foundry security groups to prevent network connections being established by unauthorized apps.
Smoke Tests	a9s KeyValue contains a post-deploy smoke tests errand that runs a series of basic test against your installation to ensure that it is configured properly.
Service Instance Capacity Upgrade	Cloud Foundry Service Plan updates allow upgrades to the RAM, CPU, and storage capacity for your Valkey instances.
Logging and Monitoring	Each Valkey service instance provides log messages and Valkey-specific metrics to one or more syslog/graphite endpoints. You can configure the syslog/graphite endpoint to receive logging and monitoring information.
Deployment Updater	This errand automatically updates the stemcell and all provisioned a9s KeyValue service instances to their latest version.
Backup Manager	The Backup Manager does regular backup of your instances and offers endpoints to backup instantly and restore backups.
CF Service Guard	The CF Service Guard creates Cloud Foundry App Security Groups for your service instance VMs. When the IP address of a service instance changes, the CF Service Guard updates the ASG.
Customazible Snapshots	a9s KeyValue supports RDB persistence with point-in-time snapshots. This setting can be changed by the user.
High Availability	a9s KeyValue ensures high-availability using Valkey Sentinel. The Consul-based internal DNS system ensures that the connected application always connects to a working node. The user can modify Sentinel related settings like min\_slaves\_max\_lag and down\_after\_milliseconds.
Improved Memory Handling	a9s KeyValue now supports a better memory handling. In addition, the user can modify the maxmemory_policy.