Docker Quick Reference

In My Words
"Docker automates the repetitive tasks of setting up and configuring multiple (dev/qa/prod) environments so that developers can focus on what matters: building great software"

Listing containers

# List running containers 
docker ps

# List all containers
docker ps -a 

Starting/Stopping containers

# Start 
docker start containerName

# Stop
docker stop containerName

Removing containers

# Remove container 
docker rm containerName

# Stop and remove container
docker rm -f containerName

# Remove all exited containers
docker rm -v $(docker ps -a -q -f status=exited)

Running commands in new containers

docker run imageName command arguments

# Example
docker run docker/whalesay cowsay Hello

# Assign a name to the container
docker run --name myName docker/whalesay cowsay Hello

# Run with a specific tag of an image
docker run node:6.9.1 node --version

# Run container in background
docker run -d -p 80:80 --name webserver nginx

See Docker run reference for more …

Images

Listing local images

docker images

Removing images

docker rmi imageName

# Remove unwanted dangling images
docker rmi $(docker images -f "dangling=true" -q)

Searching for images

# Search the Docker Hub for images
docker search searchWord

Pulling images

docker pull imageName

# Pull a specific tag
docker pull imageName:tag

# Example: Get a specific node version
docker pull node:6.9.1

Building image from Dockerfile

docker build .

# Name the image
docker build -t imageName .

# Tag the image
docker build -t imageName:1.0.0 .

Docker Swarm Cluster Creation

PS C:\windows\system32> docker swarm init --advertise-addr 10.79.124.174
Swarm initialized: current node (x6ekx7h660cg8nkneujs0n0jf) is now a manager.

To add a worker to this swarm, run the following command:

docker swarm join --token SWMTKN-1-04osgsy3kig1sdzl0q13w7sw5964515jt6c9dkqvjzsk6tntne-1ascqzq63u3gd6xrmp3qzk8ew 10.7
9.124.174:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

Docker Overview

In this post, I will document the learning I had with Docker.

Container History

- Linux Containers

• Open VZ 
• Single patched linux kernal ability to use architecture kernel version of system for executing the container
• Linux V-Server
• Virtual Private Server implementation. Created for adding OS level virtualization to the linux kernel itself.

What's a Container?

• OS level Virtualization.
• Kernel of OS allowing multiple isolated user space instances instead of one. 
• Like real server from point of view of operator.

What is Docker?
Docker is an open-source project to easily create lightweight, portable, self-sufficient containers from any application. The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more.

Technology behind Docker 

• Developed using Google's Go language
• with Linux kernel using cgroup & cnames (namespace)
• AUFS union filesystem
• LxC (Linux containers)

TB typed more...as i learn...