Kubernetes Notes18 Oct 2023 Day 3

Working with Kubernetes DaemonSets

What are the ways to Deploy POD?
--------------------------
Pod
ReplicationController
ReplicaSets
Deployment

DeamonSets
StatefulSets

DeamonSets
-------------------------------
Min - Max --- 1 POD per Node
-------------------------------
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: logging
spec:
  selector:
    matchLabels:
      app: httpd-logging
  template:
    metadata:
      labels:
        app: httpd-logging
    spec:
      containers:
        - name: webserver
          image: httpd
          ports:
          - containerPort: 80


 2004  ls
 2005  vi ds.yaml
 2006  kubectl apply -f ds.yaml
 2007  kubectl get ds
 2008  kubectl get pods --all-namespaces
 2009  kubectl get pods --all-namespaces | grep logging
 2010  kubectl get pods --all-namespaces -o wide | grep logging
 2011  clear
 2012  ls
 2013  kubectl get ds
 2014  kubectl describe ds logging
 2015  kubectl get nodes
 2016  history

Working with Kubernetes Jobs and CronJob

 2021  vi job.yaml
 2022  kubectl apply -f job.yaml
 2023  kubectl get jobs
 2024  kubectl get pods
 2025  kubectl get jobs
 2026  kubectl get pods
 2027  kubectl get jobs
 2028  kubectl get pods
 2029  kubectl get jobs
 2030  kubectl get pods
 2031  kubectl apply -f job.yaml
 2032  kubectl get pods
 2033  clear
 2034  kubectl describe job pi
 2035  clear
 2036  vi cron.yaml
 2037  kubectl apply -f cron.yaml
 2038  kubectl get cronjobs
 2039  kubectl get pods
 2040  clear
 2041  kubectl get cronjobs
 2042  kubectl get pods
 2043  kubectl get cronjobs
 2044  kubectl describe cronjob hello
 2045  history

Working with Configmap

• https://www.devopsschool.com/blog/kubernetes-configmap-explained-using-example/

 2054  ls
 2055  vi reverseproxy.conf
 2056  kubectl create configmap my-config --from-file=reverseproxy.conf
 2057  kubectl get cm
 2058  kubectl describe cm my-config
 2059  clear
 2060  ls
 2061  vi cm.yaml
 2062  kubectl apply -f cm.yaml
 2063  kubectl get pods
 2064  history
 2065  kubectl exec  helloworld-nginx ls /etc/nginx/conf.d
 2066  kubectl exec  helloworld-nginx more /etc/nginx/conf.d/myconfo.conf
 2067  history

Working with Kubernetes service

 2029  clear
 2030  kubectl apply pod1.yaml
 2031  kubectl apply -f pod1.yaml
 2032  kubectl apply -f pod2.yaml
 2033  kubectl get pods
 2034  kubectl get cronjobs
 2035  kubectl delete cronjobs hello
 2036  kubectl get jobs
 2037  kubectl delete jobs pi pi-pl-test1
 2038  kubectl get jobs
 2039  kubectl get pods
 2040  kubectl get pods -o wide
 2041  curl http://192.168.0.9
 2042  kubectl get pods -o wide
 2043  curl http://192.168.1.220
 2044  curl http://192.168.1.221
 2045  clear
 2046  ls
 2047  kubectl create svc -h
 2048  clear
 2049  kubectl get svc
 2050  kubectl create svc -h
 2051  kubectl create svc clusterip -h
 2052  clear
 2053  kubectl create service clusterip my-cs --tcp=5678:80
 2054  kubectl get svc
 2055  kubectl descrive svc my-cs
 2056  kubectl describe svc my-cs
 2057  curl http://10.103.249.69:5678
 2058  kubectl get pods --show-lables
 2059  kubectl get pods --show-labels
 2060  kubectl get svc --show-labels
 2061  kubectl edit svc my-cs
 2062  kubectl get svc --show-labels
 2063  kubectl get pods --show-labels
 2064  kubectl describe svc my-cs
 2065  curl http://10.103.249.69:5678
 2066  kubectl get pods --show-labels
 2067  kubectl edit svc my-cs
 2068  kubectl describe svc my-cs
 2069  curl http://10.103.249.69:5678
 2070  watch curl http://10.103.249.69:5678
 2071  clear