Redis Cluster configuration with HaProxy

Slides regarding this topic: https://docs.google.com/presentation/d/1J6-AUjDdqMJqZs9b2ahdidwMpTYHzkqBqu7roMjdyFs/edit?usp=sharing

An example configuration for running a Redis cluster behind a load balancer HaProxy.

HaProxy configuration is auto update via a service discovery tool: Consul. All containers are automaticaly registered to Consul via the registrator. Please read the official documentation to learn more about it.

You could also check the registry via the command line:

$ curl http://127.0.0.1:8500/v1/catalog/services

If you would like to have more details about the Redis service:

$ curl http://127.0.0.1:8500/v1/catalog/service/redis

Example of result:

[{"Node":"127.0.0.1","Address":"127.0.0.1","ServiceID":"127.0.0.1:docker_master_1:6379","ServiceName":"redis","ServiceTags":[],"ServiceAddress":"172.24.0.4","ServicePort":6379,"ServiceEnableTagOverride":false,"CreateIndex":4037,"ModifyIndex":4037},{"Node":"127.0.0.1","Address":"127.0.0.1","ServiceID":"127.0.0.1:docker_slave_1:6379","ServiceName":"redis","ServiceTags":[],"ServiceAddress":"172.24.0.5","ServicePort":6379,"ServiceEnableTagOverride":false,"CreateIndex":4044,"ModifyIndex":4044},{"Node":"127.0.0.1","Address":"127.0.0.1","ServiceID":"127.0.0.1:docker_slave_2:6379","ServiceName":"redis","ServiceTags":[],"ServiceAddress":"172.24.0.10","ServicePort":6379,"ServiceEnableTagOverride":false,"CreateIndex":4053,"ModifyIndex":4053}]%

Running the cluster

$ chmod +x setup.sh 
$ sh setup.sh

Simulate an issue with the redis master

$ chmod +x test.sh
$ sh test.sh

Check Current master

$ docker-compose exec sentinel redis-cli -p 26379 SENTINEL get-master-addr-by-name mymaster

Access to Redis Cli

$ docker-compose exec master redis-cli memory stats

No warranty or support. Use as you wish.