Download your kubeconfig configuration and point to it:
export KUBECONFIG=~/<path_to_your_kubeconfig>
Create a Kubernetes, my-api.yml, deployment file with the following contents:
apiVersion: v1
kind: Service
metadata:
name: my-api
labels:
app: my-api
spec:
ports:
- port: 3000
targetPort: api-port
protocol: TCP
selector:
app: api
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: api-deployment
spec:
selector:
matchLabels:
app: api
replicas: 1
template:
metadata:
labels:
app: api
spec:
containers:
- name: api
image: nmatsui/hello-world-api:latest
ports:
- containerPort: 3000
name: api-port
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: my-cluster-ingress
namespace: default
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: my-api
port:
number: 3000
Apply the above yml:
kubectl apply -f ./my-api.yml
Return to the Civo console, copy your external ip and call your api endoint:
curl http://<your_kubernetes_cluster_external_ip>
You should get a reply as:
{“message”:“hello world!"}
Let’s try something harder
Create a new Kubernetes, my-custom-env-reader-api.yml, deployment file with the following contents:
apiVersion: v
kind: Service
metadata:
name: api-service
labels:
app: api-service
spec:
ports:
- port: 5000
targetPort: api-port
protocol: TCP
selector:
app: api
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: api-deployment
spec:
selector:
matchLabels:
app: api
replicas: 1
template:
metadata:
labels:
app: api
spec:
containers:
- name: api
image: joelmatajunk/my-custom-env-reader-api
ports:
- containerPort: 5000
name: api-port
env:
- name: config-map-key-1
valueFrom:
configMapKeyRef:
name: api-config-map
key: config-map-key-1
- name: config-map-key-2
valueFrom:
configMapKeyRef:
name: api-config-map
key: config-map-key-2
- name: config-map-key-3
valueFrom:
configMapKeyRef:
name: api-config-map
key: config-map-key-3
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: api-ingress
namespace: default
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: api-service
port:
number: 5000
---
apiVersion: v1
kind: ConfigMap
metadata:
name: api-config-map
data:
config-map-key-1: "config-map-value-1"
config-map-key-2: "config-map-value-2"
config-map-key-3: "config-map-value-3"
Apply the above yml:
kubectl apply -f ./my-custom-env-reader-api.yml
Check your config map:
kubectl get configmap
and,
kubectl describe configmap/api-config-map
Call the api to retrieve the environment variables (plus, the ones set using the config-map):
& to keep running it in the background)kubectl port-forward --namespace default svc/api-service 5000 &
then,
curl http://localhost:5000/env
curl http://74.220.30.67/env
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: redis-cluster
namespace: default
spec:
serviceName: redis-cluster-service
replicas: 3
selector:
matchLabels:
app: redis-cluster
template:
metadata:
labels:
app: redis-cluster
spec:
containers:
- name: redis
image: redis
imagePullPolicy: IfNotPresent
ports:
- containerPort: 6379
name: redis
---
apiVersion: v1
kind: Service
metadata:
name: redis-cluster
labels:
app: redis-cluster
namespace: default
spec:
type: ClusterIP
ports:
- port: 6379
targetPort: 6379
selector:
app: redis-cluster
Apply the above yaml:
kubectl apply -f ./<filename.yaml>
Check your pods:
kubectl get pods
Check your redis pods:
kubectl get pods | grep redis
Get inside one of the redis pods:
kubectl exec --stdin --tty redis-cluster-0 -- /bin/bash
Add some values:
redis-cli
set mykey1 myvalue1
set mykey2 myvalue2
set mykey3 myvalue3
Get some value:
set mykey1 myvalue1