My Kubernetes Cheatsheet Part 2

01-Annotation.md

Kubernetes Part 2

---

Annotation

Annotation hampir sama dengan label

Bedanya, di annotation bisa menggunakan spasi

Tapi tidak bisa dilakukan filtering

Bisa sampai 256kb

• Contoh membuat pod dengan annotation (nginx)

   apiVersion: v1
   kind: Pod
   metadata:
     name: nginx-with-annotation
     labels:
   	team: fe
   	version: 1.4.1
   	environment: qa
     annotations:
   	description: Ini adalah percobaan pod dengan annotation
   	something: Apapun itu yaaa...
   spec:
     containers:
   	- name: nginx
   	  image: nginx
   	  ports:
   		- containerPort: 80

  • Terminal

     kubectl create -f <namafile>.yaml

  • Output

     pod/<namapod> created

• Melihat detail annotation di sebuah pod

   kubectl describe pod nginx-with-annotation

• Menambah dan mengubah annotation pod
  • Menambah
    • Terminal

       kubectl annotate pod <namapod> <key>=<value>

  • Mengubah
    • Terminal

       kubectl annotate pod <namapod> <key>=<value> --overwrite

  • Output

     pod/<namapod> annotated

  • Cek penambahan dan mengubahan

     kubectl descrive pod <namapod>

02-Namespace.md

Namespace

---

General

• Melihat Semua Namespace
  • Terminal

     kubectl get namespaces

    atau

     kubectl get namespace

    atau

     kubectl get ns

  • Output Example

     NAME              STATUS   AGE
     default           Active   14h
     kube-node-lease   Active   14h
     kube-public       Active   14h
     kube-system       Active   14h

• Melihat namespace tertentu
  • Terminal

     kubectl get pod --namespace <namanamespace>

    atau

     kubectl get pod -n <namanamespace>

• Menghapus namespace
  • Terminal

     kubectl delete namespace <namanamespace>

  • Output

     namespace "<namanamespace>" deleted

---

Membuat Namespace

• Configuration file

   apiVersion: v1
   kind: Namespace
   metadata:
   	name: product

• Generate file
  • Terminal
    • Di default namespace

       kubectl create -f <namafilenamespace>.yaml

    • Di namespace lain

       kubectl create -f <namafilenamespace>.yaml -n <namanamespace>

  • Output

     namespace/<namanamespace> created

• Cek pod
  • Terminal

     kubectl get pod -n <namanamespace>

  • Output

     NAME          READY   STATUS    RESTARTS   AGE
     nginx-label   1/1     Running   0          121m

03-Probe.md

Probe (Pengecekan)

---

Jenis

• Liveness Probe

   apiVersion: v1
   kind: Pod
   metadata:
     name: pod-name
     labels:
   	label-key1: label-value1
     annotations:
   	annotation-key1: annotation-value
   	annotation-key2: veri long annotation value, bla bla bla bla bla bla
   spec:
     containers:
   	- name: container-name
   	  image: image-name
   	  ports:
   		- containerPort: 80
   	  livenessProbe:
   		httpGet:
   		  path: /health
   		  port: 80
   		initialDelaySeconds: 0
   		periodSeconds: 10
   		timeoutSeconds: 1
   		successThreshold: 1
   		failureThreshold: 3

• Readiness Probe

   readinessProbe:
   	httpGet:
   		path: /
   		port: 80
   	initialDelaySeconds: 0
   	periodSeconds: 10
   	timeoutSeconds: 1
   	successThreshold: 1
   	failureThreshold: 3

• Startup Probe

   startupProbe:
   	httpGet:
   		path: / 
   		port: 80
   	initialDelaySeconds: 0
   	periodSeconds: 10
   	timeoutSeconds: 1
   	successThreshold: 1
   	failureThreshold: 3

• Generate File
  • Terminal

     kubectl create -f <namafile>.yaml

  • Output

     pod/<namapod> created

• Uji coba
  • Terminal

     kubectl port-forward <namapod> 8080:80

  • Output

     Forwarding from 127.0.0.1:8080 -> 80
     Forwarding from [::1]:8080 -> 80
     Handling connection for 8080
     Handling connection for 8080

  • Tanda jika ada handling dari probe
    • Terminal

       kubectl get pod

    • Output

       NAME                      READY   STATUS             RESTARTS   AGE
       nginx-with-probe          0/1     CrashLoopBackOff   9          17m