Redis Images and Samples in this project are implemented using the latest features of Kubernetes:
- StatefulSet
- Init Container
- Kubernetes 1.6 cluster
- Redis 3.2
If you already have a Kubernetes cluster, you can deploy High Availability Redis using the following command:
$ kubectl create -f example/
service "redis-sentinel" created
statefulset "redis-sentinel" created
service "redis-server" created
statefulset "redis-server" created
pod "console" createdYou can access Redis server using console pod:
$ kubectl exec -ti console -- /bin/bash
root@console:# export MASTER_IP="$(redis-cli -h redis-sentinel -p 26379 sentinel get-master-addr-by-name mymaster | head -1)"
root@console:# export SERVER_PASS="_redis-server._tcp.redis-server.default.svc.cluster.local"
root@console:# redis-cli -h "${MASTER_IP}" -a "${SERVER_PASS}" set foo bar
OK
root@console:# redis-cli -h redis-server -a "${SERVER_PASS}" get foo
barThe passowrd is necessary for preventing independent Redis clusters from merging together in some circumstances.
With tarosky/k8s-redis-ha, you can scale up/down Redis servers and Redis sentinels like the normal Deployment resources:
$ kubectl scale --replicas=5 statefulset/redis-sentinel
statefulset "redis-sentinel" scaled
$ kubectl scale --replicas=5 statefulset/redis-server
statefulset "redis-server" scaledAfter these scale up/down, the expected number of available slaves in the Redis set are reset automatically.
$ kubectl exec -ti console -- ipythonIn [1]: from redis import StrictRedis
In [2]: from redis.sentinel import Sentinel
In [3]: sentinel = Sentinel([
...: ('redis-sentinel-0.redis-sentinel.default.svc.cluster.local', 26379),
...: ('redis-sentinel-1.redis-sentinel.default.svc.cluster.local', 26379),
...: ('redis-sentinel-2.redis-sentinel.default.svc.cluster.local', 26379)
...: ], socket_timeout=0.1
...: )
In [4]: master = sentinel.master_for(
...: 'mymaster',
...: password='_redis-server._tcp.redis-server.default.svc.cluster.local',
...: socket_timeout=0.1
...: )
In [5]: slave = sentinel.slave_for(
...: 'mymaster',
...: password='_redis-server._tcp.redis-server.default.svc.cluster.local',
...: socket_timeout=0.1
...: )
In [6]: master.set('foo', 'bar')
Out[6]: True
In [7]: slave.get('foo')
Out[7]: b'bar'$ pyvenv .venv
$ source .venv/bin/activate
$ pip install -r test/requirements.txtYou can run the test command using the following command:
$ KUBE_NAMESPACE='{{Your name space}}' nosetests test/test.py