SAVE THE BELOW SCRIPT AND RUN IN SWARM CLUSTER TO CREATE REDIS CLUSTER
#!/bin/bash
# @pre-requisite SWARM CLUSTER
# @usage ./redis.sh
# @function - Creates a 6 node cluster with 3 master and 3 slave.
REDIS_CONFIG='port 6379
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes'
docker network create -d overlay --attachable redisnet
network=redisnet
docker service create --name redis \
--network $network \
--replicas=6 \
-e REDIS_CONFIG="$REDIS_CONFIG" \
-e REDIS_CONFIG_FILE="/usr/local/etc/redis/redis.conf" \
knowesis/redis:4.0.8 sh -c 'mkdir -p $(dirname $REDIS_CONFIG_FILE) && echo "$REDIS_CONFIG" > $REDIS_CONFIG_FILE && cat $REDIS_CONFIG_FILE && redis-server $REDIS_CONFIG_FILE'
sleep 2
docker service ps redis --no-trunc
docker run -it --rm --net $network knowesis/ruby:1.0 sh -c "\
ruby redis-trib.rb create --replicas 1 \
\$(getent hosts tasks.redis | awk '{print \$1 \":6379\"}') "