This is a sample application used to demonstrate how to create dockerized apps and deploy them to Kubernetes cluster.
It takes a sample ASP.NET Core MVC app, creates its Dockerfile, then the Kubernetes deployment objects.
The Dockerfile is used to build the app from source code. Then runs the app inside a docker container.
The k8s objects defined in YAML files are used to deploy the app into a Kubernetes cluster. These files are:
- mvc-deployment.local.yaml: used to create a Deployment and a Service to run the app.
- mssql-deployment.yaml: used to create a Deployment and a Service to run the SQL Server container.
- mssql-config-map.yaml: creates a ConfigMap object to store the database connection string as key-value pair. It is accessed by the app to retrieve the connection string as apass it as environment variable.
- mssql-secret.yaml: creates a Secret to securely save database connection string as key-value pair.
- mssql-pv.local.yaml: creates PersistentVolume and PersistentVolumeClaim objects in order to provision a storage space to save the database files.
1.1) The vision: Microservices on Docker containers on Kubernetes hosted on the Cloud and powered by DevOps.
2.1) Introduction to Dockerfile: build, run
$ docker run hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.
$ cd MvcApp
2.2) $ docker build . # don't forget the dot at the end to configure the context!
$ docker build --rm -f "Dockerfile" -t mvc-app:1.0 .
2.3) $ docker images
2.4) $ docker run --rm -d -p 5555:80/tcp mvc-app:1.0
2.5) $ docker ps
2.6) Open browser on localhost:5555 (app doesn't connect to database!!)
2.7) Configure and start SQL Server on container
2.8) $ docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=@Aa123456' -p 1433:1433 -d microsoft/mssql-server-linux:2017-CU8
3.0) Open the docker-compose.yaml file
3.1) $ docker-compose build
3.2) $ docker-compose up
Starting sqldb-k8s ... done
Starting mvcapp-k8s ... done
4.1) Tag image, login, push
4.2) $ docker tag mvc-app:1.0 houssemdocker/mvc-app:1.0 # use your own Docker Hub ID
4.3) $ docker login
4.4) $ docker push houssemdocker/mvc-app:1.0
Check your hub.docker.io
5.1) Start the Dashboard
5.2) $ minikube start
5.3) $ minikube dashboard
6.1) $ Kubectl run …
6.2) $ kubectl get deployments
6.3) $ kubectl get secrets
6.4) $ kubectl get services
7.1) $ kubectl apply -f mssql-secret.yaml
$ kubectl get secrets
7.2) $ kubectl apply -f mssql-pv.local.yaml
$ kubectl get pv
7.3) $ kubectl apply -f mssql-deployment.yaml
$ kubectl get deployments
7.4 $ kubectl apply -f mvc-deployment.local.yaml
$ kubectl get deployments
7.5) $ minikube config set memory 4096 # if we need to resize minikube
8.0) $ kubectl delete services,deployments,pvc,secrets --all -n default
8.1) $ az group create \
--location westeurope \
--subscription "Microsoft Azure Sponsorship" \
--name aks-k8s-rg
8.2) $ az aks create \
--generate-ssh-keys \
--subscription "Microsoft Azure Sponsorship" \
--node-count 1 \
--resource-group aks-k8s-rg \
--name aks-k8s
8.3) $ az aks get-credentials \
--resource-group aks-k8s-rg \
--name aks-k8s \
--subscription "Microsoft Azure Sponsorship"
Merged "aks-k8s" as current context in /Users/houssem/.kube/config
8.4) $ kubectl create clusterrolebinding kubernetes-dashboard \ --clusterrole=cluster-admin \
--serviceaccount=kube-system:kubernetes-dashboard
8.5) $ az aks browse \
--resource-group aks-k8s-rg \
--name aks-k8s \
--subscription "Microsoft Azure Sponsorship"
9.1) CI pipeline: builds the container and pushes it to docker hub.
9.2) CD pipeline: deploys the YAML manifest files into Kubernetes cluster.
scalability, health check, mounting volume, resource limits, service discovery, deploy with Helm...
eShopOnContainers: https://github.com/dotnet-architecture/eShopOnContainers
https://www.udemy.com/kubernetes-for-developers/ Please email me if you want a free coupon :)
