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Fun Stuff

Create a Namespace

kubectl create namespace funstuff
kubectl config set-context --current --namespace=funstuff

Build Images (Optional)

cd hello/python
docker build -t 9stepsawesome/mypython .

cd ../go
docker build -t 9stepsawesome/mygo .

cd ../nodejs
docker build -t 9stepsawesome/mynode .

Publish Images (Optional)

docker login quay.io # docker.io

docker tag <image-id> quay.io/burrsutter/mypython:1.0.0
docker push quay.io/burrsutter/mypython:1.0.0

docker tag <image-id> quay.io/burrsutter/mygo:1.0.0
docker push quay.io/burrsutter/mygo:1.0.0

docker tag <image-id> quay.io/burrsutter/mynode:1.0.0
docker push quay.io/burrsutter/mynode:1.0.0

Deploy Images

Using kubectl run to turn the local images into pods

kubectl run mypython --image=9stepsawesome/mypython:latest --port=8000 --image-pull-policy=Never --generator=run-pod/v1

kubectl run mygo --image=9stepsawesome/mygo:latest --port=8000 --image-pull-policy=Never --generator=run-pod/v1

kubectl run mynode --image=9stepsawesome/mynode:latest --port=8000 --image-pull-policy=Never --generator=run-pod/v1

OR

using a Deployment manifest to deploy the remotely published images

Deploy mypython

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mypython-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mypython
  template:
    metadata:
      labels:
        app: mypython
    spec:
      containers:
      - name: mypython
        image: docker.io/burrsutter/mypython:1.0.0
        ports:
        - containerPort: 8000
EOF

Deploy mygo

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mygo-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mygo
  template:
    metadata:
      labels:
        app: mygo
    spec:
      containers:
      - name: mygo
        image: quay.io/burrsutter/mygo:1.0.0
        ports:
        - containerPort: 8000
EOF

Deploy mynode

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mynode-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mynode
  template:
    metadata:
      labels:
        app: mynode
    spec:
      containers:
      - name: mynode
        image: quay.io/burrsutter/mynode:1.0.0
        ports:
        - containerPort: 8000
EOF

Show Labels

kubectl get pods --show-labels

NAME                                   READY   STATUS    RESTARTS   AGE     LABELS
mygo-deployment-77d5ccbbdd-rs2ks       1/1     Running   0          1m31s   app=mygo,pod-template-hash=77d5ccbbdd
mynode-deployment-bdcb5855d-c9p7t      1/1     Running   0          2m8s    app=mynode,pod-template-hash=bdcb5855d
mypython-deployment-7465d9f67b-lfq2v   1/1     Running   0          3m10s    app=mypython,pod-template-hash=7465d9f67b

Create Service

cd ../..
kubectl create -f kubefiles/my-service.yml

kubectl describe service my-service

kubectl get service my-service -o yaml

export IP=$(minikube --profile 9steps ip)
export NODE_PORT=$(kubectl get service/my-service -o jsonpath="{.spec.ports[*].nodePort}")

curl $IP:$NODE_PORT

curl: (7) Failed to connect to 192.168.99.102 port 32595: Connection refused

Because there is no Pod behind this Service

Add a Pod to the Service

kubectl label pod -l app=mypython inservice=mypods

curl $IP:$NODE_PORT

Python Hello on mypython-deployment-7465d9f67b-lfq2v

Add other Pods to the Service

kubectl label pod -l app=mynode inservice=mypods

kubectl label pod -l app=mygo inservice=mypods

kubectl get pods --show-labels

Curl a few times

while true
do
  curl $IP:$NODE_PORT
  sleep .3;
done

Describe Service

kubectl describe service my-service
Name:                     my-service
Namespace:                test
Labels:                   app=mystuff
Annotations:              <none>
Selector:                 inservice=mypods
Type:                     LoadBalancer
IP:                       10.104.58.121
Port:                     http  8000/TCP
TargetPort:               8000/TCP
NodePort:                 http  31996/TCP
Endpoints:                172.17.0.24:8000,172.17.0.25:8000,172.17.0.26:8000
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

The Endpoints now reflect the IP addresses of the 3 pods with the inservice:mypods label

See the Pod IPs

kubectl get pods -o wide
NAME                                   READY   STATUS    RESTARTS   AGE   IP
mygo-deployment-77d5ccbbdd-rs2ks       1/1     Running   0          27m   172.17.0.25
mynode-deployment-bdcb5855d-c9p7t      1/1     Running   0          28m   172.17.0.24
mypython-deployment-7465d9f67b-lfq2v   1/1     Running   0          36m   172.17.0.26

See the Endpoints

kubectl get endpoints
NAME         ENDPOINTS                                            AGE
my-service   172.17.0.24:8000,172.17.0.25:8000,172.17.0.26:8000   18m

Remove a Pod from the Service

by removing the "inservice" label

kubectl label pod -l app=mypython inservice-

kubectl get pods --show-labels
NAME                                   READY   STATUS    RESTARTS   AGE   LABELS
mygo-deployment-77d5ccbbdd-rs2ks       1/1     Running   0          35m   app=mygo,inservice=mypods,pod-template-hash=77d5ccbbdd
mynode-deployment-bdcb5855d-c9p7t      1/1     Running   0          36m   app=mynode,inservice=mypods,pod-template-hash=bdcb5855d
mypython-deployment-7465d9f67b-lfq2v   1/1     Running   0          44m   app=mypython,pod-template-hash=7465d9f67b

kubectl get endpoints
NAME         ENDPOINTS                           AGE
my-service   172.17.0.24:8000,172.17.0.25:8000   24m

Add it back

kubectl label pod -l app=mypython inservice=mypods

Clean up

kubectl delete namespace funstuff