Run a redis cluster as part of a docker compose configuration (for testing and development). The below sets up 3 masters with 1 replica each.

docker-compose.yml

services:
  redis-cluster:
    image: redis
    expose:
      - '7000-7005'
    environment:
      - PORT=7000
      - NODES=6
      - REPLICAS=1
      - TIMEOUT=5000
    command: >
      /usr/bin/env bash -c '
        function ctrl_c() {
          echo "Exiting!"
          exit
        }
        trap "ctrl_c" SIGINT

        # adapted from redis-5.0.5/utils/create-cluster/create-cluster (start & create)
        ENDPORT=$$((PORT + NODES))
        HOSTS=""
        IP=$$(hostname -I)
        IP=$$(echo $${IP}) # trim whitespace
        while [[ $$((PORT < ENDPORT)) != "0" ]]; do
          echo "Starting $$PORT..."
          redis-server --port $$PORT --cluster-enabled yes --cluster-config-file nodes-$${PORT}.conf --cluster-node-timeout $$TIMEOUT --appendonly yes --appendfilename appendonly-$${PORT}.aof --dbfilename dump-$${PORT}.rdb --logfile $${PORT}.log --daemonize yes
          HOSTS="$$HOSTS $$IP:$$PORT"
          PORT=$$((PORT+1))
        done
        echo "yes" | eval redis-cli --cluster create $$HOSTS --cluster-replicas $$REPLICAS
        tail -f *.log
      '