Docker

Table of Content

1. Docker
   • Image Management
   • Container Run Modes
   • Container Management
   • Docker Network
   • Docker Volumes
   • Docker Compose
   • Docker Prune Command
   • Docker Health Check
2. Building & Publishing Images
   • Docker File
   • Building Docker Image
   • Docker Hub
3. Docker Swarm
   • Swarm Architecture
   • Swarm Cluster Management
   • Swarm Service
   • Swarm Network
   • Swarm Stacks
   • Swarm Secrets

Docker Command Format

Docker Commands, Help & Tips · GitHub

docker
docker version 	# Verify CLI can talk to Engine
docker info     # Config Settings of Engine

New Docker Command Format

docker <command> <sub-command> (options)
docker container run

Old Docker Command Format

docker <command> (options)
docker run

Docker Command Examples

Miscellaneous Points

• Containers are only alive till the command that started the container is running
• When we specify an command at the end of the “docker run” command it will overwrite the default startup command of the container
• It is best practice to create a new network for each application
• The default network driver used by Docker is Bridge. The default bridge does not have a DNS Server. To overcome this issue the --link flag can be used which allows to link containers that need to communicate with each other together
• When we run a container an new read/ write layer is added over the base image (a new copy of base image is not created) because of this only extra space for the new layer is required