Executing a Command in Container

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Sun Nov 29 2020 18:39:10 GMT+0000 (Coordinated Universal Time)

Saved by @ankity09 #aws,ckad

kubectl exec -it hazelcast -- /bin/sh

allows you to execute a command inside the pod

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CKAD

@ankity09

Finding Object Information Imperative Approach Hybrid Approach EDITING A LIVE OBJECT Dockerfile for Java application Build Dockerfile Run Docker Container Create Pod from Command Line Yaml definition for pod describes pod Accessing Logs of a Pod Executing a Command in Container Declaring Environment Variables Defining a Command with Arguments Quick Delete pod Simple container with env variables Pod with command running in it

Hybrid Approach

kubectl run frontend --image=nginx --port=80 \
  -o yaml --dry-run=client > pod.yaml

EDITING A LIVE OBJECT

kubectl edit pod frontend

Dockerfile for Java application

FROM openjdk:11-jre-slim
WORKDIR /app
COPY target/java-hello-world-0.0.1.jar java-hello-world.jar
ENTRYPOINT ["java", "-jar", "/app/java-hello-world.jar"]
EXPOSE 8080

Build Dockerfile

docker build -t java-hello-world:1.0.0 .

Run Docker Container

docker run -d -p 8080:8080 java-hello-world:1.0.0

Create Pod from Command Line

kubectl run hazelcast --image=hazelcast/hazelcast --port=5701 \
  --env="DNS_DOMAIN=cluster" --labels="app=hazelcast,env=prod"

Yaml definition for pod

apiVersion: v1
kind: Pod
metadata:
  name: hazelcast
  labels:
    app: hazelcast
    env: prod
spec:
  containers:
  - env:
    - name: DNS_DOMAIN
      value: cluster
    image: hazelcast/hazelcast
    name: hazelcast
    ports:
    - containerPort: 5701

kubectl describe pods hazelcast

Accessing Logs of a Pod

kubectl logs pod/hazelcast

Executing a Command in Container

kubectl exec -it hazelcast -- /bin/sh

Declaring Environment Variables

apiVersion: v1
kind: Pod
metadata:
  name: spring-boot-app
spec:
  containers:
  - image: bmuschko/spring-boot-app:1.5.3
    name: spring-boot-app
    env:
    - name: SPRING_PROFILES_ACTIVE
      value: prod
    - name: VERSION
      value: '1.5.3'

Defining a Command with Arguments

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: mypod
  name: mypod
spec:
  containers:
  - command: ["/bin/sh"]
    args: ["-c", "while true; do date; sleep 10; done"]
    image: busybox
    name: mypod
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

Quick Delete pod

kubectl delete pod nginx --grace-period=0 --force

Simple container with env variables

apiVersion: v1
kind: Pod
metadata:
  name: ckad-nginx
spec:
  containers:
  -  name: nginx
     image: nginx:1.17.10
     ports:
     -  containerPort: 80
     env:
       -  name: DB_URL
          value: postgresql://mydb:5432
       -  name: DB_USERNAME
          value: admin

Pod with command running in it

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: loop
  name: loop
spec:
  containers:
  - args:
    - /bin/sh
    - -c
    - while true; do date; sleep 10; done
    image: busybox
    name: loop
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

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