Key Benefits

• Software Version Management
  • It works on my Computer but not yours
     
• Clean and Fast Installation on software
  • scenario: getting started with Redis
     
• Ease of Deployment from one env to another

Docker Containers

Consistent way to Start and Build

• Contain its own process space
• Own network interface
• Private directories
• Entire Environment is sandboxed

Sounds very identical to VM! But docker is much lighter

Docker Image

Blue Print to create a Docker Container

• ​A Docker Image is a layer of other docker images.
• Efficient, one layer can be share across multiple container. 
  • ubuntu is use as base image, one image of ubuntu is used across 4 different containers. 
• Docker Image is immutable, once build, it cannot be changed. If changes are made, you will get a new image as a result.

Docker Image

Popular command

• ​docker pull [image name]
  • pull redis, dotnet, node, etc... 
• docker run [image name]
  • run the image you pulled
• docker images
  • list all the images
• docker ps 
  • list all containers
• docker
  • show all available command

Container Volume

Persisting Data within Container

• Read/Write Layer in a container directory
• Multiple container can share the same directory
• Volume are persisted after container is gone
• The volume are located in the host OS, can be mapped with -v [host dir]:[container dir]
  
   
• you can inspect the container with docker inspect

Tools

• Docker Client: interface that Interact with daemon
• Docker Daemon: the engine powering Docker
• Docker Compose:
• VSCode Docker Integration

Docker Image

Blueprint to create a docker container

1. Immutable
2. Overlay on top of another Image(s)
3.  

OS level Virtualization