Detailed concepts of Networking, Services, Node-Port, and Volume in Kubernetes

> Kubernetes Networking Concept in Detail:

Theory:

Screenshot (1331).png

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How Two different Containers communicate with each-other within the Same Pod:

LAB:

> Create a new AWS Instance named “Minikube” on T2-Medium & access it via PUTTY as we do, then do the rest lab:
- ubuntu
- sudo su
- apt update && apt -y install [docker.io](<http://docker.io>) → Now Install docker
- curl -LO [<https://storage.googleapis.com/kubern>...](<https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbTZrdHFlT2pZQlB4OXhLWHRhUDEyX2NBbzZ2QXxBQ3Jtc0tsaC1lQVZsY0JXbnVzRGxvWjBjV1Rna2NBZlN3a2JPei1uRlloNzRaV3RQUXRrWVpJaE55ZFZ6S3BCaGFXOUx3ejYtXzJDcjdlSWc4MGJVYzBMNjlIanE3OXVZbjQyLVBQTURlRDF2a0pwbmJVV2hrbw&q=https%3A%2F%2Fstorage.googleapis.com%2Fkubernetes-release%2Frelease%2F%24%28curl&v=hV8zi3vdQqk>) -s [<https://storage.googleapis.com/kubern>...](<https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbXJxa2IwTm5majRfdUdtV3N4VUcyMmF5WFVVUXxBQ3Jtc0trZ1lnRVBZVjk1Sm5QLWo4aVFEaXhfRkZmTzc5OGx3eHpIYWV6bTZtNHNxUkszU2lfUTdnSnk4TG1pSmRxdmRSb2RlQmlTdGZoVWRrcHJieVd4X3ltQkdJOUcyUkNnZEtLd0daQ194WnM5UWQtek10dw&q=https%3A%2F%2Fstorage.googleapis.com%2Fkubernetes-release%2Frelease%2Fstable.txt%29%2Fbin%2Flinux%2Famd64%2Fkubectl&v=hV8zi3vdQqk>) && chmod +x ./kubectl && sudo mv ./kubectl /usr/local/bin/kubectl → Now Install Kubectl
- which kubectl
- kubectl version
- curl -Lo minikube [<https://storage.googleapis.com/miniku>...](<https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqazBQTF9JUWpSRVgtVFNLYlMwYWl3UFAwaG9VQXxBQ3Jtc0tscHpZX1Y2Vm15NHpGdC1OajlkcmxJNExIMVV5ak9pNTllTG1xcmc0eDY0WmRYblg2MWFiNDZXSkxWWmJSNEFxVTYycGZZN3BMYjhuTjh5c05XZDVxLTBJQkNqRWZwejg2NXhKdjhUZ3NMQUJGWU5saw&q=https%3A%2F%2Fstorage.googleapis.com%2Fminikube%2Freleases%2Flatest%2Fminikube-linux-amd64&v=hV8zi3vdQqk>) && chmod +x minikube && sudo mv minikube /usr/local/bin/ → Now Install Minikube
- apt install conntrack
- minikube start --vm-driver=none → This command starts Minikube [ Always run this to start Minikube ]
- minikube status
- vi pod1.yml
```
# KUBERNETES NETWORKING
kind: Pod
apiVersion: v1
metadata:
  name: testpod
spec:
  containers:
    - name: c00
      image: ubuntu
      command: ["/bin/bash", "-c", "while true; do echo Hello-Bhupinder; sleep 5 ; done"]
    - name: c01
      image: httpd # Apache Webserver
      ports:
       - containerPort: 80
```
- kubectl apply -f pod1.yml → Applies the configuration from “pod1.yml” to create or update a pod named “testpod”
- kubectl get pods → Lists all pods
- kubectl exec testpod -it -c c00 -- /bin/bash → By this command, you will redirect inside that particular Container & you can run commands their inside the Container
  - apt update && apt install curl → It will install Curl Package inside that Container
  - curl [localhost:80](<http://localhost:80>) → check if the “Port:80” means Apache Server ****is working on that particular Container or not
  - exit → Exit from the Containers Terminal and change the directory to the Pod
- kubectl delete -f pod1.yml → It will delete the testpod created by the above YAML file
How Two different Pods Communicate with each-other within the same Node:

LAB:

> It will be the Sequence of above labs
- vi pod2.yml
```
# KUBERNETES NETWORKING
kind: Pod
apiVersion: v1
metadata:
  name: testpod1
spec:
  containers:
    - name: c01
      image: nginx # nginx Webserver
      ports:
       - containerPort: 80
```
- vi pod3.yml
```
# KUBERNETES NETWORKING
kind: Pod
apiVersion: v1
metadata:
  name: testpod4
spec:
  containers:
    - name: c03
      image: httpd # Apache Webserver
      ports:
       - containerPort: 80
```
- kubectl apply -f pod2.yml → Applies the configuration from “pod2.yml” to create or update a pod named “testpod1”
- kubectl apply -f pod3.yml → Applies the configuration from “pod3.yml” to create or update a pod named “testpod4”
- kubectl get pods → It will show how many Pods are available
- kubectl get pods -o wide → By using this command, you will get every details about all of Your Pod
- curl ip_address_of_that_pod:80 → To check if the “Port:80” means Web Server is working on that particular Pod or not