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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Working with Instructions

  • FROM: Initializes a new build stage and sets the Base Image

  • RUN: Will execute any commands in a new layer

  • CMD: Provides a default for an executing container. There can only be one CMD instruction in a Dockerfile

  • LABEL: Adds metadata to an image

  • EXPOSE: Informs Docker that the container listens on the specified network ports at runtime

  • ENV: Sets the environment variable to the value

  • ADD: Copies new files, directories or remote file URLs from and adds them to the filesystem of the image at the path .

  • COPY: Copies new files or directories from and adds them to the filesystem of the container at the path .

  • ENTRYPOINT: Allows for configuring a container that will run as an executable

  • VOLUME: Creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers

  • USER: Sets the user name (or UID) and optionally the user group (or GID) to use when running the image and for any RUN, CMD, and ENTRYPOINT instructions that follow it in the Dockerfile

  • WORKDIR: Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD instructions that follow it in the Dockerfile

  • ARG: Defines a variable that users can pass at build-time to the builder with the docker build command, using the --build-arg = flag

  • ONBUILD: Adds a trigger instruction to the image that will be executed at a later time, when the image is used as the base for another build

  • HEALTHCHECK: Tells Docker how to test a container to check that it is still working

  • SHELL: Allows the default shell used for the shell form of commands to be overridden

To set up the environment:

Create the Dockerfile:

Dockerfile contents:

Create an image for the weather-app

Build the weather-app image:

List the images:

Create the weather-app container:

List all running containers:

Last updated 1 year ago

  • Working with Instructions
  • To set up the environment:
  • Create the Dockerfile:
  • Dockerfile contents:
  • Build the weather-app image:
  • Create the weather-app container:
  • List all running containers:
PreviousDockerfile FundamentalsNextDockerfile Environment Variables
  1. Dockerfile Fundamentals

Dockerfile Instructions

sudo apt install git -y
mkdir weather-app
cd weather-app
git clone https://github.com/nishanthkumarpathi/content-weather-app src
vi Dockerfile
FROM node
LABEL org.label-schema.version=v1.1
RUN mkdir -p /var/node
ADD src/ /var/node/
WORKDIR /var/node
RUN npm install
EXPOSE 3000
CMD ./bin/www
docker image build -t nishanthkp/weather-app:v1 .
docker image ls
docker container run -d --name weather-app1 -p 8081:3000 nishanthkp/weather-app:v1
docker container ls