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kubernetes microservice example using redis replication with redis slave deployed as side car.

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redis-replication-kubernetes-microservice

In some use cases, a redis cluster or redis sentinel is considered as over enginering, over resource consumption, and a redis replication can perfectly fit. Espesially in a microservice context, where one should be 100% independent, having its life cycle and requirments.

Getting started

Prerequisites

Deployment

helm  install ./ -f values.yaml --namespace microservice-redis --name microservice-redis

Anatomy

All redis configuration is built around bitnami/redis

Redis-slave

  • Redis slave will be deployed as a side car (Read Only) to your main contianer, and will automaticly connects to redis master.
  • Redis slave will not have persistence since it will serve as a replicas to master, if you wish to enable it you can edit redis-slave-configmap
  • you can edit Redis slave configuration in redis-slave-configmap or in values.yaml

Redis-master

  • Redis master will be deployed as an independent deployment (Write Only), You should write to it from you main miscroservice container.
  • Redis master will be persisted through a pvc. AOF and RDB are enables. More details in redis-master-deployment.yaml
  • you can edit Redis master configuration in redis-master-configmap or in values.yaml

Main Microservice Conatiner

  • Microservice Conatiner will have Read only access to Redis slave.
  • Microservice Conatiner will have write only access to Redis Master.
  • Microservice will have the follwoing Environment variables to facilitate access to Redis
Env Variable Function
MASTER_REDIS_DB Redis master Data Base
MASTER_REDIS_HOST Redis master host
MASTER_REDIS_PORT Redis master port
MASTER_REDIS_PASSWORD Redis master password
MASTER_REDIS_CONNECTION_NAME Redis master connection name
------------- -------------
SLAVE_REDIS_HOST Redis slave host
SLAVE_REDIS_PORT Redis slave port
SLAVE_REDIS_DB Redis slave Data Base
SLAVE_REDIS_PASSWORD Redis slave password
SLAVE_REDIS_CONNECTION_NAME Redis slave connection name

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