hortonworks/k8s-redis-ha

Name: k8s-redis-ha

Owner: Hortonworks Inc

Description: Kubernetes Redis with High Availability

Forked from: keyki/k8s-redis-ha

Created: 2017-08-23 14:22:35.0

Updated: 2017-11-02 23:17:24.0

Pushed: 2018-01-08 13:58:11.0

Homepage: null

Size: 1770

Language: Shell

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README

Kubernetes Redis with High Availability

Redis Images and Samples in this project are implemented using the latest features of Kubernetes:

• StatefulSet
• Init Container

Requirements

• Kubernetes 1.6 cluster
• Redis 3.2

Quick Start

If you already have a Kubernetes cluster, you can deploy High Availability Redis using the following command:

bectl create -f example/
ice "redis-sentinel" created
efulset "redis-sentinel" created
ice "redis-server" created
efulset "redis-server" created
"console" created

Accessing Redis

You can access Redis server using console pod:

bectl exec -ti console -- /bin/bash
@console:# export MASTER_IP="$(redis-cli -h redis-sentinel -p 26379 sentinel get-master-addr-by-name mymaster | head -1)"
@console:# export SERVER_PASS="_redis-server._tcp.redis-server.default.svc.cluster.local"
@console:# redis-cli -h "${MASTER_IP}" -a "${SERVER_PASS}" set foo bar

@console:# redis-cli -h redis-server -a "${SERVER_PASS}" get foo

The passowrd is necessary for preventing independent Redis clusters from merging together in some circumstances.

Scale Up and Down

With tarosky/k8s-redis-ha, you can scale up/down Redis servers and Redis sentinels like the normal Deployment resources:

bectl scale --replicas=5 statefulset/redis-sentinel
efulset "redis-sentinel" scaled
bectl scale --replicas=5 statefulset/redis-server
efulset "redis-server" scaled

After these scale up/down, the expected number of available slaves in the Redis set are reset automatically.

Sample Code in Python

bectl exec -ti console -- ipython

ython
1]: from redis import StrictRedis

2]: from redis.sentinel import Sentinel

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
..: )

4]: master = sentinel.master_for(
..:     'mymaster',
..:     password='_redis-server._tcp.redis-server.default.svc.cluster.local',
..:     socket_timeout=0.1
..: )

5]: slave = sentinel.slave_for(
..:     'mymaster',
..:     password='_redis-server._tcp.redis-server.default.svc.cluster.local',
..:     socket_timeout=0.1
..: )

6]: master.set('foo', 'bar')
6]: True

7]: slave.get('foo')
7]: b'bar'

Running the Test Script

venv .venv
urce .venv/bin/activate
p install -r test/requirements.txt

You can run the test command using the following command:

BE_NAMESPACE='{{Your name space}}' nosetests test/test.py