Kubernetes Lessons Learned

ASP.NET CORE and Docker

ASP.NET Core Application with Docker

Add SQL Server 2017 Docker Container to ASP.NET Core MVC/Web API Project

Docker Compose

Deploy ASP.NET Core Application images in Kubernetes (K8s) & POD

Kubernetes ReplicationController

Access ASP.NET Core MVC Application with Kubernetes and NodePort

Create a Kubernetes service using a YAML

Deploy ASP.NET CORE application with the Kubernetes Deployments

Kubernetes ReplicaSet selector with matchExpressions

Kubernetes Deployment Update Strategy

Access ASP.NET Core MVC Application with Kubernetes and NodePort

Execute the command "kubectl describe pod myapp-rc-wl284",  each of them is running on a specific IP, internal to the node.  

The Node IP (192.168.65.3), but you can’t access it directly because the forwarding rule to send the requests from the node IP to the pod IP is missing.

Kubernetes ReplicationController

Create multiple instances of the pod using a ReplicationController, which is a master controller that replicates the specified pods, balances them on all the nodes, and reacts if some pod dies to restore the desired state.

forntendmvc_rc.yaml 

--- 
apiVersion: v1
kind: ReplicationController
metadata: 
 name: myapp-rc
spec: 
   replicas: 5  
   selector:    
     app: myapp    
   template:    
     metadata:         
       labels:           
         app: myapp           
         zone: prod           
         version: v1        
     spec:           
       containers:             
         - name:myapp-frontendmvc              
           image: makader/myapp:frontendmvc-v1              
           ports:               
             - containerPort:80

Deploy ASP.NET Core Application images in Kubernetes (K8s) & POD

Publish the image in Docker Hub

Rename the image tag from frontendmvc:v1, to <account_username>/<repository_name>:<tag> (in our case, makdockerhub/myapp:frontendmvc-v1). 

docker tag frontendmvc makader/myapp:frontendmvc-v1

Publish the image with the docker push command. 

  docker push makader/myapp:frontendmvc-v1

 

 

Now we can deploy a frontendmvc container everywhere (aws, azure, pcf, Kubernetes,...).