DevSecOps for BBK
  • Introduction
  • Getting Started
    • Virtual Training Practices
    • Training Plan
    • Tools and Configuration
    • Troubleshooting
  • Docker Fundamentals
    • Docker Setup
    • Docker First Container
    • Docker Network Basics
    • Docker Network Exercise
    • Docker Volume Basics
    • Docker Storage
  • Dockerfile Fundamentals
    • Dockerfile Instructions
    • Dockerfile Environment Variables
    • Dockerfile Build Arguments
    • Non-privileged Containers
    • Dockerfile Order of Execution
    • Dockerfile Volume
    • Entrypoint Command
    • Multiple Stage Build
  • Container Management
    • Containers Start Automatically
  • Docker Security
    • Seccomp Profile
  • Docker Compose
    • Docker Compose Install
    • Docker Compose Commands
    • Docker Compose File
    • Docker Compose Volumes and Network
  • K8s Cluster Setup
    • Minikube Installation
    • Calico Networking
    • K8s Walkthrough
    • K8s Cheat Sheet
  • Understand K8s
    • Pod Connectivity
    • Deployments
    • Service Cluster IP
    • Service NodePort
    • ClusterIP Exercise
    • NodePort Exercise
    • Service LoadBalancer
    • Configmap
    • Secrets
  • Application Lifecycle Management
    • Rolling Updates and Rollback
    • Multi Container Pod
  • K8s Storage
    • Persistent Volume
    • Persistent Volume Claim
    • PVC in POD
  • Istio
    • AKS Setup
    • Kubectl Setup in Windows
    • Istio Setup Manual
    • Istio Demo App
    • Istio Observability
  • Terraform
    • Terraform Setup
    • Terraform Demo
    • Azure Terraform Setup
  • Terraform AWS
    • Terraform AWS Setup
    • Terraform AWS Demo S3
  • Refrences
    • Docker Static Site
    • Docker First Image
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Last updated 1 year ago

In this lesson, we will begin working with the ENTRYPOINT instruction. Though ENTRYPOINT functions very similarly to CMD it's behaviors are very different.

ENTRYPOINT allows us to configure a container that will run as an executable. We can override all elements specified using CMD. Using the docker run --entrypoint flag will override the ENTRYPOINT instruction.

Step 1: Setup your environment:

Step 2: Clone the image:

Step 3: Create the Dockerfile:

Step 3: Create an image for the weather-app

Dockerfile contents:

Step 4: Build the image:

Step 5: Deploy the weather-app:

Step 6: Inspect weather-app4:

Step 7: Create the weather-app container:

Step 8: Inspect weather-app5:

Step 9: Create the volumes for Prometheus:

Step 10: Create the Prometheus container:

Step 11: Inspect Prometheus:

Prometheus Dockerfile

https://github.com/prometheus/prometheus/blob/master/Dockerfile

PreviousDockerfile VolumeNextMultiple Stage Build
  1. Dockerfile Fundamentals

Entrypoint Command

mkdir entrypoint
cd entrypoint
git clone https://github.com/nishanthkumarpathi/content-weather-app.git src
vi Dockerfile
FROM node
LABEL org.label-schema.version=v1.1
ENV NODE_ENV="production"
ENV PORT 3001

RUN mkdir -p /var/node
ADD src/ /var/node/
WORKDIR /var/node
RUN npm install
EXPOSE $PORT
ENTRYPOINT ./bin/www
docker image build -t nishanthkp/weather-app:v4 .
docker container run -d --name weather-app4 nishanthkp/weather-app:v4
docker container inspect weather-app4 | grep Cmd
docker container inspect weather-app-nonroot
docker container inspect weather-app4
docker container run -d --name weather-app5 -p 8083:3001 nishanthkp/weather-app:v4 echo "Hello World"
docker container inspect weather-app5
docker volume create prometheus
docker volume create prometheus_data
sudo chown -R nfsnobody:nfsnobody /var/lib/docker/volumes/prometheus/
sudo chown -R nfsnobody:nfsnobody /var/lib/docker/volumes/prometheus_data/
docker run --name prometheus -d -p 8084:9090 \
  -v prometheus:/etc/prometheus \
  -v prometheus_data:/prometheus/data \
  prom/prometheus \
  --config.file=/etc/prometheus/prometheus.yml \
  --storage.tsdb.path=/prometheus/data
docker container inspect prometheus