Redis Sentinel

Here's a small multi-node sandbox for testing Redis Sentinel.

Uses Vagrant, Virtualbox, Chef, Docker and.. Redis Sentinel.

Requirements

• Docker

brew install docker docker-completion

Usage

Starting: docker compose up -d

If you need more hosts you can scale slaves and sentinels using --scale

docker compose up -d --scale redis-slave=2 --scale redis-sentinel=3

Stopping: docker compose down

Endpoints

Note that the master and slave redis endpoints are protected by auth, no user is set, but the password is password.

Endpoint ports are generated at random by Docker. Use docker ps to see what is assigned.

$ docker ps
CONTAINER ID   ...   PORTS                      NAMES
259b695ac746   ...   0.0.0.0:61437->26379/tcp   sentinel_redis-sentinel_1
b7dc76fdf21c   ...   0.0.0.0:61438->26379/tcp   sentinel_redis-sentinel_2
a444bae88906   ...   0.0.0.0:61435->6379/tcp    sentinel_redis-slave_1
e1c2e92f6713   ...   0.0.0.0:61436->6379/tcp    sentinel_redis-slave_2
78db319d76ab   ...   0.0.0.0:61383->6379/tcp    sentinel_redis_1

From the example above the endpoints to use would be

• Redis: redis://127.0.0.1:61383/0
• Sentinel: redis://127.0.0.1:61437/0

You can directly connect to them via redis-cli

$ redis-cli -p 61383
127.0.0.1:61383> AUTH password
OK
127.0.0.1:61383> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=172.18.0.3,port=6379,state=online,offset=210321,lag=0
slave1:ip=172.18.0.4,port=6379,state=online,offset=210470,lag=0
master_failover_state:no-failover
master_replid:a9dc0d2cd508c1186b71115f5e68aab5c3616f72
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:210605
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:210605

$ redis-cli -p 61437
127.0.0.1:61437> info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=172.25.0.2:6379,slaves=2,sentinels=3