Redis-HA

Table of Contents

Overview

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-HA

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.

Prerequisites on Redis-HA

You need to provide a storage provider for this Building Block. Proceed with the following prerequisite description to use the Velero Building Block out of the box.

A recommended resource overview is listed in the table below.

CPU / vCPU Memory
1.3 1380 + 128-256MiB per worker node

No further activities need to be carried out in advance.

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: 1.33.0
  - project: syseleven/building-blocks/helmfiles/redis-ha
    file: JobStaging.yaml
    ref: 1.33.0
  - project: syseleven/building-blocks/helmfiles/redis-ha
    file: JobProduction.yaml
    ref: 1.33.0

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