K8S Redis connection

Question

I've installed Bitnami Helm Chart for HA Redis: https://bitnami.com/stack/redis/helm

aleg@Azure:~$ kubectl get pods | grep redis redis-1580896952-master-0 1/1 Running 0 67m redis-1580896952-slave-0 1/1 Running 0 67m redis-1580896952-slave-1 1/1 Running 0 65m aleg@Azure:~$ kubectl get svc | grep redis redis-1580896952-headless ClusterIP None <none> 6379/TCP 67m redis-1580896952-master ClusterIP 10.0.244.169 <none> 6379/TCP 67m redis-1580896952-slave ClusterIP 10.0.250.136 <none> 6379/TCP 67m 

How should i connect to it? To service or master pod or something else? Please advice.

Answer 1

This is nicely explained with Example: Deploying PHP Guestbook application with Redis.

The whole setup process is explained and then the Set up and Expose the Guestbook Frontend is describing how to expose a web frontend serving a HTTP requests. It's configured to connect to redis-master service for write requests and to the redis-slave service for read requests.

Example deployment looks like the following:

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2 kind: Deployment metadata: name: frontend labels: app: guestbook spec: selector: matchLabels: app: guestbook tier: frontend replicas: 3 template: metadata: labels: app: guestbook tier: frontend spec: containers: - name: php-redis image: gcr.io/google-samples/gb-frontend:v4 resources: requests: cpu: 100m memory: 100Mi env: - name: GET_HOSTS_FROM value: dns # Using `GET_HOSTS_FROM=dns` requires your cluster to # provide a dns service. As of Kubernetes 1.3, DNS is a built-in # service launched automatically. However, if the cluster you are using # does not have a built-in DNS service, you can instead # access an environment variable to find the master # service's host. To do so, comment out the 'value: dns' line above, and # uncomment the line below: # value: env ports: - containerPort: 80 

With that setup you just need to create the frontend service:

apiVersion: v1 kind: Service metadata: name: frontend labels: app: guestbook tier: frontend spec: # comment or delete the following line if you want to use a LoadBalancer type: NodePort # if your cluster supports it, uncomment the following to automatically create # an external load-balanced IP for the frontend service. # type: LoadBalancer ports: - port: 80 selector: app: guestbook tier: frontend 

I do recommend reading the docs regarding Redis.