Python, Kubernetes & friends

This is the presentation I made for PyGrunn 2016.

Thanks to Jobandtalent for sponsoring my trip! :)

Transcript

1. PYTHON, Kubernetes & FRIENDS @AGONZALEZRO
2. WHAT IS Kubernetes?
3. Framework for building distributed systems. (Kelsey's dixit)
5. OUR FIRST APP! $ kubectl run pygrunn \ --image=python:2.7 \ --command -- python -m SimpleHTTPServer
6. WHAT DO WE GET HERE?
7. A POD $ kubectl get pods NAME READY STATUS RESTARTS AGE pygrunn-1906403705-dckh7 1/1 Running 0 1m
8. A REPLICA SET $ kubectl get replicasets NAME DESIRED CURRENT AGE pygrunn-1552838933 1 1 11s
9. AND A DEPLOYMENT $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE pygrunn 1 1 1 1 2m
10. SHOW IT TO THE WORLD $ kubectl expose deployment pygrunn \ --port=80 --target-port=8000 --type=LoadBalancer
11. LET'S USE THE WAITING TIME $ kubectl exec -it pygrunn-1906403705-dckh7 bash
12. HERE IT IS $ kubectl get services NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE pygrunn 10.3.255.124 130.211.52.23 80/TCP 57s
13. HN FRONT PAGE! $ kubectl scale deployment pygrunn --replicas=3
14. THE END (FOR NOW)
16. WHAT WE DID THERE? ▸ Pods ▸ Replica Set ▸ Service ▸ Deployment
17. A "REAL" DEPLOYMENT
18. MAIN.PY from flask import Flask, url_for app = Flask(__name__) @app.route('/') def index(): return '<img width="100%" src="{}" />'.format( url_for('static', filename='grumpy.gif') ) if __name__ == '__main__': app.run(host='0.0.0.0')
19. DOCKERFILE FROM python:2.7.11-onbuild EXPOSE 5000 CMD ["uwsgi", "-http 5000", "-w main"]
20. $ docker build -t agonzalezro/pygrunn:grumpy . $ docker push agonzalezro/pygrunn
21. DEPLOYMENT.YAML (1/3) apiVersion: extensions/v1beta1 kind: Deployment metadata: name: pygrunn-deploy labels: name: pygrunn-deploy ...
22. DEPLOYMENT.YAML (2/3) ... spec: replicas: 3 selector: matchLabels: name: flask-app template: metadata: labels: name: flask-app ...
23. DEPLOYMENT.YAML (3/3) ... spec: containers: - name: app image: agonzalezro/pygrunn:grumpy ports: - containerPort: 5000 - name: nginx image: agonzalezro/pygrunn-nginx ports: - containerPort: 80 readinessProbe: httpGet: path: / port: 80
24. apiVersion: extensions/v1beta1 kind: Deployment metadata: name: pygrunn-deploy labels: name: pygrunn-deploy spec: replicas: 3 selector: matchLabels: name: flask-app template: metadata: labels: name: flask-app spec: containers: - name: app image: agonzalezro/pygrunn:happy ports: - containerPort: 5000 - name: nginx image: agonzalezro/pygrunn-nginx ports: - containerPort: 80 readinessProbe: httpGet: path: / port: 80
25. SERVICE.YAML apiVersion: v1 kind: Service metadata: name: flask-service spec: type: LoadBalancer ports: - port: 80 targetPort: 5000 selector: name: flask-app
26. $ kubectl create -f deployment.yaml -f service.yaml
27. $ sed -i "s/replicas: 3/replicas: 5/" deployment.yaml $ kubectl apply -f deployment.yaml
28. $ sed -i "s/grumpy/happy/" deployment.yaml $ kubectl apply -f deployment.yaml
29. HOMEWORK ▸ Add a nginx in top ▸ Add a DB ▸ Use a private registry
30. THE END (AGAIN)
34. Thanks! @AGONZALEZRO