a9s Redis®
This documentation describes the a9s Redis®*. a9s Redis® enables on-demand provisioning of VM-based, dedicated Redis®
servers. Developers can create instances of a Redis® 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-redis command, BOSH creates dedicated VMs for this Service Instance.
This allows the best possible bad neighborhood protection.
Redis® 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 Redis® includes the following key features:
| Feature | Benefit |
|---|---|
| On-Demand Service Instance Provisioning | a9s Redis® deploys Redis® instances automatically. Developers can provision a single-VM Redis® server using a single command. |
| Service Instance Isolation | Each Redis® server runs on a dedicated VM to ensure bad neighborhood protection in order to be aligned with enterprise security requirements. a9s Redis® uses Cloud Foundry security groups to prevent network connections being established by unauthorized apps. |
| Smoke Tests | a9s Redis® 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 Redis® instances. |
| Logging and Monitoring | Each Redis® Service Instance provides log messages and Redis®-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 Redis® 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 Redis® supports RDB persistence with point-in-time snapshots. This setting can be changed by the user. |
| High Availability | a9s Redis® ensures high-availability using Redis® 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 Redis® now supports a better memory handling. In addition, the user can modify the maxmemory_policy. |
*Redis is a registered trademark of Redis Ltd. Any rights therein are reserved to Redis Ltd. Any use by anynines GmbH is for referential purposes only and does not indicate any sponsorship, endorsement or affiliation between Redis and anynines GmbH.