Kubernetes Service Notes – 25 Sept 2023

TYPES OF SERVICES
=======================================
ClustorIP
	- default one
NodePort
	ClustorIP
	service get exposed at Port of the each Node of the clustor

LoadBalancer
	Create 1 SVC of Cluster IP
	service get exposed at Port of the each Node of the clustor
	Create a LB at Cloud
	Add all node of the cluster to that LB


apiVersion: v1
kind: Pod
metadata:
  name: rajesh1
  labels:
    app: helloworld
spec:
  containers:
  - name: devopsschool1
    image: scmgalaxy/nginx-devopsschoolv1
    ports:
    - name: nginx-port
      containerPort: 80


apiVersion: v1
kind: Pod
metadata:
  name: rajesh2
  labels:
    app: helloworld
spec:
  containers:
  - name: devopsschool1
    image: scmgalaxy/nginx-devopsschoolv2
    ports:
    - name: nginx-port
      containerPort: 80

kubectl create service clustorip my-ns --tcp=5678:80
kubectl create service nodeport my-ns --tcp=5678:80


NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP          3d19h
my-cs        ClusterIP   10.110.241.178   <none>        5678/TCP         9m26s
my-ns        NodePort    10.104.141.152   <none>        5678:31938/TCP   2m19s



NODEIP:31938 --> 10.104.141.152:5678 --> PODIP


 790  mkdir rajesh
  791  cd rajesh/
  792  ls
  793  clear
  794  ls
  795  vi pod1.yaml
  796  vi pod2.yaml
  797  ls
  798  kubectl get pods
  799  kubectl delete deploy my-dep
  800  clear
  801  ls
  802  kubectl get pods
  803  clear
  804  ls
  805  kubectl apply -f pod1.yaml
  806  kubectl apply -f pod2.yaml
  807  clear
  808  kubectl get pods
  809  kubectl get pods -o wide
  810  curl http://192.168.0.25
  811  curl http://192.168.0.26
  812  clear
  813  ls
  814  kubectl create service -h
  815  kubectl create service clusterip
  816  kubectl create service clusterip -h
  817  clear
  818  kubectl get svc
  819  kubectl create service clusterip my-cs --tcp=5678:80
  820  kubectl get svc
  821  clear
  822  ls
  823  kubectl get svc
  824  kubectl describe svc my-cs
  825  kubectl get pods --show-lables
  826  kubectl get pods --show-labels
  827  kubectl edit svc my-cs
  828  clear
  829  kubectl get pods --show-labels
  830  kubectl describe svc my-cs
  831  kubectl edit svc my-cs
  832  kubectl describe svc my-cs
  833  curl http://10.110.241.178
  834  curl http://10.110.241.178:5678
  835  watch curl http://10.110.241.178:5678
  836  clear
  837  kubectl create service nodeport -h
  838  clear
  839  kubectl create service nodeport my-ns --tcp=5678:80
  840  kubectl get svc
  841  kubectl get svc --show-lables
  842  kubectl get svc --show-labels
  843  kubectl get pods --show-labels
  844  kubectl edit svc my-ns
  845  kubectl describe svc my-ns
  846  kubectl get svc
  847  clear
  848  kubectl describe svc my-ns
  849  kubectl describe svc my-cs
  850  history

PV and PVC using Hostpath

 873  kubectl get pv
  874  pwd
  875  clear
  876  ls
  877  vi pv1.yaml
  878  clear
  879  kubectl apply -f pv1.yaml
  880  kubevtl get pvs
  881  kubevtl get pv
  882  clear
  883  kubectl get pv
  884  vi pv1.yaml
  885  kubectl apply -f pv1.yaml
  886  kubectl get pv
  887  vi pvc1.yaml
  888  kubectl get pvc
  889  kubectl apply -f pvc1.yaml
  890  kubectl get pvc
  891  kubectl describe pvc pvchostpath
  892  kubectl get pvc
  893  clear
  894  vi pvc1.yaml
  895  kubectl apply -f pvc1.yaml
  896  kubectl get pvc
  897  kubectl get pv
  898  vi pod.yaml
  899  kubectl apply pod.yaml
  900  kubectl apply -f pod.yaml
  901  clear
  902  kubectl get pods
  903  kubectl exec task-pv-pod touch /usr/share/nginx/html/index.html
  904  kubectl exec task-pv-pod ls /usr/share/nginx/html/index.html
  905  kubectl exec task-pv-pod ls /usr/share/nginx/html/
  906  kubectl get pods -o wide
  907  clear
  908  ls
  909  kubectl get pods -o wide
  910  kubectl delete pod task-pv-pod
  911  kubectl apply -f pod.yaml
  912  kubectl get pods -o wide
  913  kubectl exec task-pv-pod ls /usr/share/nginx/html/
  914  clear

PV and PVC using NFS

ConfigMaps

Secrets