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README.md
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README.md
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# Kubernetes exemple avec Flask / Postgres et Vue
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# Kubernetes exemple avec Minikube
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### Docker :whale:
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Exemple de déploiement d'une application flask avec postgres en backend et vue.js en front
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Construire les images et démarrer les services:
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### Pré requis :bookmark_tabs:
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```bash
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docker-compose up -d --build
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```
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- Docker et compose plugin
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- Virtualbox
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- Minikube (mini K8S)
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1. [http://localhost:8080/](http://localhost:8080/)
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1. [http://localhost:5001/books/ping](http://localhost:5001/books/ping)
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1. [http://localhost:5001/books](http://localhost:5001/books)
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### Installation Minikube
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### Kubernetes
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#### Minikube
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[Installer](https://github.com/kubernetes/minikube/releases) et lancer [Minikube](https://kubernetes.io/docs/setup/minikube/):
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Installer et lancer [Minikube](https://kubernetes.io/docs/setup/minikube/):
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```bash
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curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
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sudo install minikube-linux-amd64 /usr/local/bin/minikube
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```
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Démarrer le cluster:
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- Démarrer le cluster:
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```bash
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minikube start --vm-driver=virtualbox
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minikube start --vm-driver=virtualbox --nodes 2
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minikube dashboard
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```
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#### Volume
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### Déploiement des services :rocket:
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Créer le volume persistant:
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> La dashboard pop dans le navigateur :bar_chart:
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#### Volume persistant
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- Créer le volume persistant:
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```bash
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kubectl apply -f ./kubernetes/persistent-volume.yml
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```
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Créer le volume claim:
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- Créer le volume claim:
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```bash
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kubectl apply -f ./kubernetes/persistent-volume-claim.yml
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```
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#### Secrets
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#### Secrets :lock:
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Créer un objet secret:
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- Créer un objet secret:
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```bash
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kubectl apply -f ./kubernetes/secret.yml
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```
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> Les secrets sont encodés sur base 64
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```bash
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echo -n "pleasechangeme" | base64
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# output:
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cGxlYXNlY2hhbmdlbWU=
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echo -n "sample" | base64
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# output:
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c2FtcGxl
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```
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#### Postgres
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Créer le deployement:
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- Créer le deployement:
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```bash
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kubectl create -f ./kubernetes/postgres-deployment.yml
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```
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Créer le service:
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- Créer le service:
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```bash
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kubectl create -f ./kubernetes/postgres-service.yml
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```
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Créer la database:
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- Créer la database:
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```bash
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kubectl get pods
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@ -75,28 +84,19 @@ kubectl exec postgres-<POD_IDENTIFIER> --stdin --tty -- createdb -U postgres boo
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#### Flask
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onstruire l'image et la pousser sur le Docker Hub:
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```bash
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docker build -t <DOCKER_HUB_USERNAME>/flask-kubernetes ./services/server
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docker push <DOCKER_HUB_USERNAME>/flask-kubernetes
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```
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> Make sure to replace `<DOCKER_HUB_USERNAME>` with your Docker Hub namespace in the above commands as well as in *kubernetes/flask-deployment.yml*
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Créer le deployement:
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- Créer le deployement:
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```bash
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kubectl create -f ./kubernetes/flask-deployment.yml
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```
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Créer le service:
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- Créer le service:
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```bash
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kubectl create -f ./kubernetes/flask-service.yml
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```
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Appliquer la migration et la source de la database:
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- Appliquer la migration et la source de la database:
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```bash
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kubectl get pods
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@ -106,56 +106,87 @@ kubectl exec flask-<POD_IDENTIFIER> --stdin --tty -- python manage.py seed_db
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#### Vue
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Construire l'image et la pousser sur le Docker Hub:
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```bash
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docker build -t <DOCKER_HUB_USERNAME>/vue-kubernetes ./services/client \
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-f ./services/client/Dockerfile-minikube
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docker push <DOCKER_HUB_USERNAME>/vue-kubernetes
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```
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> Again, replace `<DOCKER_HUB_USERNAME>` with your Docker Hub namespace in the above commands as well as in *kubernetes/vue-deployment.yml*
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Créer le deployement:
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```bash
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kubectl create -f ./kubernetes/vue-deployment.yml
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```
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Créer le service:
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- - Créer le service:
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```bash
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kubectl create -f ./kubernetes/vue-service.yml
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```
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#### Ingress
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#### Ingress :door:
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Installer et démarrer l'ingress:
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- Installer et démarrer l'ingress:
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```bash
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minikube addons enable ingress
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kubectl apply -f ./kubernetes/minikube-ingress.yml
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```
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Ajouter une entrée au fichier */etc/hosts*:
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- Ajouter une entrée au fichier */etc/hosts*:
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```bash
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echo "$(minikube ip) hello.world" | sudo tee -a /etc/hosts
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echo "$(minikube ip) flask.book" | sudo tee -a /etc/hosts
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```
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Try it out:
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### Résultat :checkered_flag:
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1. [http://hello.world/books/ping](http://hello.world/books/ping)
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1. [http://hello.world/books](http://hello.world/books)
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- L'application est disponible à l'adresse:
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:push_pin: [http://flask.book/](http://flask.book/)
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> [http://hello.world/](http://hello.world/).
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- Tester les différents pods du replica set flask:
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```bash
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for ((i=1;i<=10;i++)); do curl http://flask.book/books/ping; done
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```
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### Commandes
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- Infos:
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```bash
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kubectl get pods
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kubectl get deployment
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```
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- Scaler des les services:
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```bash
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kubectl scale deployment flask --replicas=5
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kubectl scale deployment vue --replicas=2
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```
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- Pods logs:
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```bash
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kubectl logs <POD_NAME>
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```
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### Debug
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- En cas de problèmes avec Minikube, reinstaller celui-ci:
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```bash
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minikube stop; minikube delete
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rm /usr/local/bin/minikube
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rm -rf ~/.minikube
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# re-download minikube
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minikube start
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```
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### Cheatsheet
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[Kubernetes commandes](https://github.com/dennyzhang/cheatsheet-kubernetes-A4)
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### Todo
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- [ ] commandes kubectl utiles + mise à l'échelle
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- [ ] changer hello.world
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- [ ] changer flask.book
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- [ ] transposer ver K8S multinode
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- [ ] traduire vue.js templates
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29
deploy.sh
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deploy.sh
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#!/bin/bash
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echo "Creating the volume...\n"
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minikube start --vm-driver=virtualbox
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echo "Creating the volume..."
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kubectl apply -f ./kubernetes/persistent-volume.yml
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kubectl apply -f ./kubernetes/persistent-volume-claim.yml
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echo "Creating the database credentials...\n"
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echo "Creating the database credentials..."
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kubectl apply -f ./kubernetes/secret.yml
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echo "Creating the postgres deployment and service...\n"
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echo "Creating the postgres deployment and service..."
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kubectl create -f ./kubernetes/postgres-deployment.yml
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kubectl create -f ./kubernetes/postgres-service.yml
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echo "Creating the flask deployment and service...\n"
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echo "Creating the flask deployment and service..."
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kubectl create -f ./kubernetes/flask-deployment.yml
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kubectl create -f ./kubernetes/flask-service.yml
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echo "Adding the ingress...\n"
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echo "Creating the vue deployment and service..."
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kubectl create -f ./kubernetes/vue-deployment.yml
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kubectl create -f ./kubernetes/vue-service.yml
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echo "Adding the ingress..."
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minikube addons enable ingress
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kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission
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kubectl apply -f ./kubernetes/minikube-ingress.yml
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echo "Creating the vue deployment and service...\n"
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echo "Creating hello.world entry in /etc/hosts..."
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kubectl create -f ./kubernetes/vue-deployment.yml
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kubectl create -f ./kubernetes/vue-service.yml
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echo "$(minikube ip) hello.world" | sudo tee -a /etc/hosts
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# BROKEN -> A FAIRE MANUELLEMENT !!!
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echo "Creating database books in postgres...\n"
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echo "Creating database books in postgres..."
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POD_NAME=$(kubectl get pod -l service=postgres -o jsonpath="{.items[0].metadata.name}")
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kubectl exec $POD_NAME --stdin --tty -- createdb -U sample books
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# BROKEN -> A FAIRE MANUELLEMENT !!!
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echo "Recreating database books in flask...\n"
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echo "Recreating database books in flask..."
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FLASK_POD_NAME=$(kubectl get pod -l app=flask -o jsonpath="{.items[0].metadata.name}")
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kubectl exec $FLASK_POD_NAME --stdin --tty -- python manage.py recreate_db
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kubectl exec $FLASK_POD_NAME --stdin --tty -- python manage.py seed_db
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minikube dashboard
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