[Example] Redis Sentinel

[palkan]

How to use this branch

• Build anycable-go with Sentinel support for Linux (make build-linux) and put in into bin/ folder of this project.

• Provision Docker dev env if not yet:

dip provision

• Start Redis, slave and first sentinel:

dip up redis-sentinel

• Add more sentinels for quorum:

docker-compose scale redis-sentinel=3

• Run WebSocket server with debug output:

DEBUG=1 dip up anycable

• Run Rails console:

dip rails c

• In Rails console, broadcast messages to see whether anycable-go sees them:

num = 0
# repeat as many times as you want, all the messages will have different bodies
ActionCable.server.broadcast "all", "test_#{(num = num.succ}"

• While broadcasting messages, do the following:

# pause master Redis
docker pause anycable_demo_redis_1

# unpause master Redis
docker unpause anycable_demo_redis_1

# pause slave
docker pause anycable_demo_redis-slave_1

Between pausing/unpausing Redis instances, try to broadcast messages and see if the channel is alive.