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
Powered by GitBook
On this page

Last updated 1 year ago

This lesson focuses on the order that instructions are executed in when building an image. Some instructions may have unintended consequences that can cause your build to fail.

Step 1: Setup your environment:

Step 2: Create the Dockerfile:

Step 3: Creates a CentOS image that uses cloud_user as a non-privileged user

Dockerfile contents:

Step 4: Build the new image:

PreviousNon-privileged ContainersNextDockerfile Volume
  1. Dockerfile Fundamentals

Dockerfile Order of Execution

mkdir centos-conf
cd centos-conf
vi Dockerfile
FROM centos:latest
RUN mkdir -p ~/new-dir1
RUN useradd -ms /bin/bash cloud_user
USER cloud_user
RUN mkdir -p ~/new-dir2
RUN mkdir -p /etc/myconf
RUN echo "Some config data" >> /etc/myconf/my.conf
docker image build -t centos7/myconf:v1 .