[Training] Docker Basics

Docker

• Short answer: lightweight linux VMs
• Long answer: Docker is a system for building and running Containers
• You can think of them as small containers

Containers instead VMs?

• Portable
  • Development environment can be guaranteed to behave like your production environment
• Scalable
  • Cloud providers can quickly add or remove more containers to meet demand
• Lightweight
  • You only run what you need to
• Composable
  • You can pull an existing container with most of what you need so you didn't start from scratch

Important Concepts

• Container
  • a standalone executable package of software
• Image
  • template with instructions for creating a container
• Docker Hub
  • It's like a github for docker images. Images can be private or public
  • Docker webiste to get open source images
• ECR
  • Elastic Container Registry. Similar to Docker Hub, but on AWS.
  • Private way of uploading Docker
• ECS (Recommended Version)
  • Elastic Container Service: an AWS system for hosting containers.
    • We are moving to this way
  • Amazon ECO System
• Kubernetes
  • a popular sofware for hosting containers in a way that's scalable and portable
  • downside: complex
• Depends on the Configuration (Kubernetes >> dedicated to clusters) >> might lower cost and higher performance, but developer time (expansive >> easier to use feature)

 

DEMO

• How to Dockerize? Make my website run on the Docker Container
  • Create a Docker File
    • FROM httpd:2.4 (Image)
      • Start from this image
    • COPY [Location]
      • Copy my website to default place
  • Then run with command "docker build -t"
    • Create a docker of cheat-codes
  • "docker run --name [memorable name]"
    • or we can run it with "docker run --publish [portNumber] [ID of the image]"
      • feed port 80 >> default http (can be hidden from the command line)
      • ex: 8080:80 forward to 80
      • It can be just the name
• Then it will be employed every place same from docker hub 
• Expand it and build on it were possible.

 

SYNTAX to check for

• How to Dockerize? Make my website run on the Docker Container
  • Push and Pull (Look at their projects)

• yml files && Docker Hub

 

Containers vs Lambda

• Lambdas are usually cheaper but Containers are faster