redis-cluster
Redis cluster with Docker Compose
Using Docker Compose to setup a redis cluster with sentinel.
This project is inspired by the project of https://github.com/mdevilliers/docker-rediscluster
Prerequisite
Install Docker and Docker Compose in testing environment
Docker Compose template of Redis cluster
The tempalte defines the topology of the Redis cluster
master:
image: redis:3
slave:
image: redis:3
command: redis-server --slaveof redis-master 6379
links:
- master:redis-master
sentinel:
build: sentinel
environment:
- SENTINEL_DOWN_AFTER=5000
- SENTINEL_FAILOVER=5000
links:
- master:redis-master
- slave
There are following services in the cluster,
- master: Redis master
- slave: Redis slave
- sentinel: Redis sentinel
The sentinels are configured with a "mymaster" instance with the following properties -
sentinel monitor mymaster redis-master 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
The details could be found in sentinel/sentinel.conf
The default values of the environment variables for Sentinel are as following
- SENTINEL_QUORUM: 2
- SENTINEL_DOWN_AFTER: 30000
- SENTINEL_FAILOVER: 180000
Play with it
Build the sentinel Docker image
docker-compose build
Start the redis cluster
docker-compose up -d
Check the status of redis cluster
docker-compose ps
The result is
Name Command State Ports
--------------------------------------------------------------------------------------
rediscluster_master_1 docker-entrypoint.sh redis ... Up 6379/tcp
rediscluster_sentinel_1 docker-entrypoint.sh redis ... Up 26379/tcp, 6379/tcp
rediscluster_slave_1 docker-entrypoint.sh redis ... Up 6379/tcp
Scale out the instance number of sentinel
docker-compose scale sentinel=3
Scale out the instance number of slaves
docker-compose scale slave=2
Check the status of redis cluster
docker-compose ps
The result is
Name Command State Ports
--------------------------------------------------------------------------------------
rediscluster_master_1 docker-entrypoint.sh redis ... Up 6379/tcp
rediscluster_sentinel_1 docker-entrypoint.sh redis ... Up 26379/tcp, 6379/tcp
rediscluster_sentinel_2 docker-entrypoint.sh redis ... Up 26379/tcp, 6379/tcp
rediscluster_sentinel_3 docker-entrypoint.sh redis ... Up 26379/tcp, 6379/tcp
rediscluster_slave_1 docker-entrypoint.sh redis ... Up 6379/tcp
rediscluster_slave_2 docker-entrypoint.sh redis ... Up 6379/tcp
Execut the test scripts
./test.sh
to simulate stop and recover the Redis master. And you will see the master is switched to slave automatically.
Or, you can do the test manually to pause/unpause redis server through
docker pause rediscluster_master_1
docker unpause rediscluster_master_1
And get the sentinel infomation with following commands
docker exec rediscluster_sentinel_1 redis-cli -p 26379 SENTINEL get-master-addr-by-name mymaster
References
https://github.com/mdevilliers/docker-rediscluster
[https://registry.hub.docker.com/u/joshula/redis-sentinel/] 2
License
Apache 2.0 license
Contributors
- Li Yi ([email protected])
- Ty Alexander ([email protected])
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