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Python, Kubernetes & friends
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Alexandre González
May 13, 2016
Technology
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450
Python, Kubernetes & friends
This is the presentation I made for PyGrunn 2016.
Thanks to Jobandtalent for sponsoring my trip! :)
Alexandre González
May 13, 2016
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Transcript
PYTHON, Kubernetes & FRIENDS @AGONZALEZRO
WHAT IS Kubernetes?
Framework for building distributed systems. (Kelsey's dixit)
None
OUR FIRST APP! $ kubectl run pygrunn \ --image=python:2.7 \
--command -- python -m SimpleHTTPServer
WHAT DO WE GET HERE?
A POD $ kubectl get pods NAME READY STATUS RESTARTS
AGE pygrunn-1906403705-dckh7 1/1 Running 0 1m
A REPLICA SET $ kubectl get replicasets NAME DESIRED CURRENT
AGE pygrunn-1552838933 1 1 11s
AND A DEPLOYMENT $ kubectl get deployments NAME DESIRED CURRENT
UP-TO-DATE AVAILABLE AGE pygrunn 1 1 1 1 2m
SHOW IT TO THE WORLD $ kubectl expose deployment pygrunn
\ --port=80 --target-port=8000 --type=LoadBalancer
LET'S USE THE WAITING TIME $ kubectl exec -it pygrunn-1906403705-dckh7
bash
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
HN FRONT PAGE! $ kubectl scale deployment pygrunn --replicas=3
THE END (FOR NOW)
None
WHAT WE DID THERE? ▸ Pods ▸ Replica Set ▸
Service ▸ Deployment
A "REAL" DEPLOYMENT
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')
DOCKERFILE FROM python:2.7.11-onbuild EXPOSE 5000 CMD ["uwsgi", "-http 5000", "-w
main"]
$ docker build -t agonzalezro/pygrunn:grumpy . $ docker push agonzalezro/pygrunn
DEPLOYMENT.YAML (1/3) apiVersion: extensions/v1beta1 kind: Deployment metadata: name: pygrunn-deploy labels:
name: pygrunn-deploy ...
DEPLOYMENT.YAML (2/3) ... spec: replicas: 3 selector: matchLabels: name: flask-app
template: metadata: labels: name: flask-app ...
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
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
SERVICE.YAML apiVersion: v1 kind: Service metadata: name: flask-service spec: type:
LoadBalancer ports: - port: 80 targetPort: 5000 selector: name: flask-app
$ kubectl create -f deployment.yaml -f service.yaml
$ sed -i "s/replicas: 3/replicas: 5/" deployment.yaml $ kubectl apply
-f deployment.yaml
$ sed -i "s/grumpy/happy/" deployment.yaml $ kubectl apply -f deployment.yaml
HOMEWORK ▸ Add a nginx in top ▸ Add a
DB ▸ Use a private registry
THE END (AGAIN)
None
None
None
Thanks! @AGONZALEZRO