elmassafi.md

Training Topic

Kubernets Basics

1. What is Kubernetes?

2. Components of Kubernetes¹.

   ³

3. Controllers²:

   • What are they?
   • Types:
     • ReplicaSets
     • Deployments^*
     • StatefulSets^*
     • DaemonSets^*
     • Jobs
     • CronJob
     • Garbage Collection
     • TTL Controller or Finished Resources
     • ReplicationController

4. Services and Ingress:

   • Services:

     • ClusterIP
     • NodePort
     • LoadBalancer

   • Ingress Resource:

       internet
          |
       [ Ingress ]
       --|-----|--
       [ Services ]
     

     • Types of Ingresses⁴:

       • Single Service Ingress:

         apiVersion: networking.k8s.io/v1beta1
         kind: Ingress
         metadata:
         name: test-ingress
         spec:
         backend:
            serviceName: testsvc
            servicePort: 80
         

       • Simple fanout:

         foo.bar.com -> 178.91.123.132 -> / foo    service1:4200
                                          / bar    service2:8080
       

         apiVersion: networking.k8s.io/v1beta1
         kind: Ingress
         metadata:
         name: simple-fanout-example
         annotations:
            nginx.ingress.kubernetes.io/rewrite-target: /
         spec:
         rules:
         - host: foo.bar.com
            http:
               paths:
               - path: /foo
               backend:
                  serviceName: service1
                  servicePort: 4200
               - path: /bar
               backend:
                  serviceName: service2
                  servicePort: 8080
       
       

       • Name based virtual hosting

           foo.bar.com --|                 |-> foo.bar.com service1:80
                         | 178.91.123.132  |
           bar.foo.com --|                 |-> bar.foo.com service2:80
       
       

       apiVersion: networking.k8s.io/v1beta1
       kind: Ingress
       metadata:
       name: name-virtual-host-ingress
       spec:
       rules:
       - host: foo.bar.com
         http:
            paths:
            - backend:
               serviceName: service1
               servicePort: 80
       - host: bar.foo.com
         http:
            paths:
            - backend:
               serviceName: service2
               servicePort: 80
       
       

       • TLS

         apiVersion: v1
         kind: Secret
         metadata:
            name: testsecret-tls
            namespace: default
         data:
            tls.crt: base64 encoded cert
            tls.key: base64 encoded key
         type: kubernetes.io/tls
       
       
         apiVersion: networking.k8s.io/v1beta1
         kind: Ingress
         metadata:
         name: tls-example-ingress
         spec:
         tls:
         - hosts:
               - sslexample.foo.com
            secretName: testsecret-tls
         rules:
         - host: sslexample.foo.com
            http:
               paths:
               - path: /
               backend:
                  serviceName: service1
                  servicePort: 80
       
       

1: components of kubernetes

2: controllers

3: image source

4: ingress explained