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