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Lec-51 Complete Overview of Kubernetes Networking and Services.Kubernetes Services Types explained: ClusterIP vs NodePort vs LoadBalancer vs Headless Service vs Multi-Port.volumes in kubernetes like emptydir and hostpath.
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LEC-51 DEVOPS TECHNICAL GUFTGU NOTES
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Install Docker
$ sudo apt update && apt -y install docker.io
Install kubectl
$ curl -LO storage.google... -s storage.google... && chmod +x ./kubectl && sudo mv ./kubectl /usr/local/bin/kubectl
Install Minikube
$ curl -Lo minikube storage.google... && chmod +x minikube && sudo mv minikube /usr/local/bin/
Start Minikube
$ apt install conntrack
$ minikube start --vm-driver=none
$ minikube status
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KUBERNETES NETWORKING
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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
ports:
- containerPort: 80
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kind: Deployment
apiVersion: apps/v1
metadata:
name: mydeployments
spec:
replicas: 1
selector: # tells the controller which pods to watch/belong to
matchLabels:
name: deployment
template:
metadata:
name: testpod1
labels:
name: deployment
spec:
containers:
- name: c00
image: httpd
ports:
- containerPort: 80
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kind: Service # Defines to create Service type Object
apiVersion: v1
metadata:
name: demoservice
spec:
ports:
- port: 80 # Containers port exposed
targetPort: 80 # Pods port
selector:
name: deployment # Apply this service to any pods which has the specific label
type: ClusterIP # Specifies the service type i.e ClusterIP or NodePort
$ kubectl get svc
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volume labs
===========================
apiVersion: v1
kind: Pod
metadata:
name: myvolemptydir
spec:
containers:
- name: c1
image: centos
command: ["/bin/bash", "-c", "sleep 15000"]
volumeMounts: # Mount definition inside the container
- name: xchange
mountPath: "/tmp/xchange"
- name: c2
image: centos
command: ["/bin/bash", "-c", "sleep 10000"]
volumeMounts:
- name: xchange
mountPath: "/tmp/data"
volumes:
- name: xchange
emptyDir: {}
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HOST PATH
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apiVersion: v1
kind: Pod
metadata:
name: myvolhostpath
spec:
containers:
- image: centos
name: testc
command: ["/bin/bash", "-c", "sleep 15000"]
volumeMounts:
- mountPath: /tmp/hostpath
name: testvolume
volumes:
- name: testvolume
hostPath:
path: /tmp/data
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