Covered

1. Docker
2. Kubernates
3. Event Bus using RabbitMQ
4. gRPC

Pending

1. Service discovery
2. Handle Null connection

Execution

1. Build image from the folder with dockerfile :

docker build -t nayan112/platformservice .

4. Run the image: (disabled https redirection & swagger is enabled in dev only)

docker run -p 8080:80 -d nayan112/platformservice

6. push the image :

docker push nayan112/platformservice

4. Check id kubernetis is running with version:

kubectl version

6. Navigate to the folder K8S and deploy platform service & related cluster ip:

kubectl apply -f platforms-deployment.yaml

7. Check deployments: (need to push the image to docker hub first if missed)

kubectl get deployments
kubectl get pods

8. delete deployment related to platform service:

kubectl delete deployment platform-deployment 

9. Start services to enable access through node port:

kubectl apply -f platforms-np-srv.yaml

10. Check services:

kubectl get services

11. Get the external port of nodeport to connect to the pod
12. Refresh deployment/docker image:

kubectl rollout restart deployment <depoyment_name>

13. To view pods running from all namespaces: (default is application namespace):

kubectl get namespaces 
kubectl get deployments --namespace=ingress-nginx 
kubectl get services --namespace=ingress-nginx

14. Configuration of Ingress Nginx container & Ingress Nginx load balancer:

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.1.2/deploy/static/provider/cloud/deploy.yaml

15. Deploy ingress service so that application can be accessed from outside:

kubectl apply -f ingress-srv.yaml  

16. Ingress service needs a host name. Localhost doesn't work. So create an entry in host file similar to hostname in deployment file.
17. Create persistent view claim for MSSQL:

kubectl apply -f local-pvc.yaml

18. Verify the claim:

kubectl get pvc 
kubectl get storageclass

19. Create a secret for db password:

kubectl create secret generic mssql --from-literal=SA_PASSWORD="r00t.R00T"  

20. Deploy mssql: check status with pods & deployments (ImagePullBackOff is a common error)

kubectl apply -f mssql-platform-deployment.yaml

21. Setup of DB migration (not part of execution): run ef migration. Need to disable in memory db & set db connection string)

dotnet ef migrations add initialmigration

22. Deploy rabbitmq queue manager & management portal, load balancer & cluster ip: (verify at http://localhost:15672)

kubectl apply -f rabbitmq-deployment.yaml

23. gRPC setup done without https, needed in the server (platformservice) -- check kestrel config in prod configs

Help

1. Editing code in VSCode: Navigate to the particular project and type

code -r <foldername>

2. Formatting in VS CODE :

Alt + Shift + F

Errors

1. Swagger fails to load : Fix: decoreate api methods with REST method decorators, HTTPGET, HTTPPUT
2. GetPlatformById method doesnt hit breakpoint/Swagger doesn't hit the method: Duplicate method if query string is not recognized. Set decorator as HTTPGET("Id=id")
3. Converting YAML to JSON: yaml: line 4: found character that cannot start any token: Yaml is CRAZY.. use spaces instead of tab
4. NodePort not working: Verify name in selector-> app & service deployment file (eg. in platforms-deployment.yaml & platforms-np-srv.yaml)
5. http port is not accessible: System restart or try changing the port no.
6. ImagePullBackOff : no network, no image, wrong image path
7. mssql image deployment error: port 1433 in host machine in use, password policy not in complience

Enabling & using local dashboard: Remote- coming..

1. Deploy dashboard:

kubectl apply -f dashboard.yaml

2. Deploy an admin user:

kubectl apply -f dashboard-adminuser.yaml

3. Get the token:

kubectl -n kubernetes-dashboard get secret $(kubectl -n kubernetes-dashboard get sa/admin-user -o jsonpath="{.secrets[0].name}") -o go-template="{{.data.token | base64decode}}"

4. Run the dashboard proxy:

kubectl proxy 

5. Application is available Application

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/

6. Remove the admin ServiceAccount and ClusterRoleBinding.

kubectl -n kubernetes-dashboard delete serviceaccount admin-user
kubectl -n kubernetes-dashboard delete clusterrolebinding admin-user

Video link

    https://www.youtube.com/watch?v=DgVjEo3OGBI