Redis-HA

Table of Contents

Overview

Redis is a widely used in memory data store which can be used as a database. It belongs to NoSQL Databases and fits to use cases where a simple datastructures fit.
The source code and default configuration of the Building Block is available in our code.sysEleven.de. Infos on release notes and new features please follow Release notes redis-ha

Redis Architecture

Redis consists of 5 Pods:

2 x HAProxy
3 x Redis HA Server

Adding the Building Block

Add the directory syseleven-redis-ha to your control repository. Add a .gitlab-ci.yml to the directory with the following content:

include:
  - project: syseleven/building-blocks/helmfiles/redis-ha
    file: JobDevelopment.yaml
    ref: 1.32.0
  - project: syseleven/building-blocks/helmfiles/redis-ha
    file: JobStaging.yaml
    ref: 1.32.0
  - project: syseleven/building-blocks/helmfiles/redis-ha
    file: JobProduction.yaml
    ref: 1.32.0

Remove environments you are not using by removing their include.

Configuration

Redis maxmemory/pod limits config option

For a production-grade setup, it is highly recommended to define a maxmemory limit for Redis and resource limit for the pod.
In our experience the formula maxmemory * 125% <= limits can be used for a stable configuration.

syseleven-redis-ha/values-redis-ha.yaml

redis:
  config:
    maxmemory: 1024MB
  resources:
    limits:
      memory: 1280Mi

Monitoring

Additional alertrules

  • Redis
    • Cluster
    • Memory
    • Connections
  • HAProxy
    • Cluster
    • Connections to redis
    • Connections in general

Additional Grafana dashboards

  • Redis
    • An overview of performance metrics of Redis (e.g. memory usage, clients, hits/misses, total items, ...)
  • HAProxy
    • An overview of performance metrics of HAProxy (e.g. connections, sessions, queues, ...)

Redis

See Scaling Redis for upstream documentation.

  • Amount of replicas can be adjusted
  • Requests/limits for CPU/memory can be adjusted

HAProxy

  • Amount of replicas can be adjusted
  • Requests/limits for CPU/memory can be adjusted

Scaling Setup

This building block consists of multiple components. Each of the components can and must be scaled individually.

Release-Notes

Please find more infos on release notes and new features Release notes Redis-HA