Setting up a Go service on kubernetes using a dapr redis state store

This is just an example of setting up a Go service on a kubernetes with DAPR. The service is using a dapr redis state component to save data. The deployment environment is kubernetes that comes with Docker desktop for windows. The Go code is very simplistic as I am just starting to play with Go.

Setup DAPR on your kubernetes (Docker desktop for windows)

1. Install dapr to k8s with helm as shown at this page
2. Deploy redis to k8s with helm
   • Instructions is at this page

Application setup

• Add dapr state component
• Build docker image of your app/api
• Deploy your api on k8s (with dapr annotation for your pod)
• Test your app/api

1. Deploy a dapr component to use the above redis as a store (using deploy/redis.yaml)
   • This yaml is compatible with above redis deployment

   kubectl apply -f deploy/redis.yaml
   

2. Build an image of your program,

   docker build -t project-service .
   

3. Deploy your program (deployment, service, ingress) to k8s

   kubectl apply -f deploy/project-service.yaml
   

4. Test your api at 'alpaca.example.com/project-service' This is the uri you set up with your Ingress in file deploy/project-service.yaml
   • Just hello world and extra url params

   curl http://alpaca.example.com/project-service
   curl http://alpaca.example.com/project-service/query?name=Fred&age=93
   

   • Post a project json to the api. It will return the object saved.

   curl -X POST -H "Content-Type: application/json" -d @project.json http://alpaca.example.com/project-service
   

Checking the redis store

kubectl get pods

ingress-nginx-controller-57cb5bf694-2n68f   1/1     Running   3          39h  
project-service-78f99c65f6-qq94c            2/2     Running   0          79m  
redis-master-0                              1/1     Running   6          2d16h
redis-replicas-0                            1/1     Running   7          2d16h
redis-replicas-1                            1/1     Running   6          2d16h
redis-replicas-2                            1/1     Running   6          2d16h

Start redis-cli on pod redis-master-0

k exec -it redis-master-0 -- redis-cli

Issue redis-cli commands to interact

auth <password>
keys *
hgetall <key>