Tiven Wang
Wang Tiven April 25, 2017
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First Steps

The Basic Commands

$ docker run -h CONTAINER -i -t debian /bin/bash

Building Images from Dockerfiles

docker build -t test/cowsay-dockerfile .

docker run --rm test/cowsay-dockerfile "Moo world"

Problem: standard_init_linux.go:178: exec user process caused “no such file or directory”
When: make the entrypoint.sh as the ENTRYPOINT
Fixed: dos2unix entrypoint.sh

Docker Fundamentals

The Docker Architecture

High-level overview of major Docker components

The Docker daemon used an “execution driver” to create containers.

execution driver:

  • runc CLI tool for spawning and running containers according to the OCI specification

  • LXC is a userspace interface for the Linux kernel containment features. Through a powerful API and simple tools, it lets Linux users easily create and manage system or application containers.

Docker storage drivers

Surrounding Technologies

  • Swarm
  • Compose
  • Machine
  • Kitematic
  • Docker Trusted Registry
  • Networking: Weave, Project Calico, Overlay
  • Service discovery: Consul, Registrator, SkyDNS, etcd
  • Orchestration and cluster management: Kubernetes from Google, Marathon for Mesos, CoreOS’s Fleet, Docker’s Swarm

Docker Hosting

How Images Get Built

The Build Context

docker build - < Dockerfile

docker build - < context.tar.gz

docker build -f dockerfiles/Dockerfile.debug

.dockerignore

Image Layers

docker history mongo:latest

Caching

docker build --no-cache

Dockerfile Instructions

Dockerfile reference

Best practices for writing Dockerfiles

Linking Containers

Managing Data with Volumes and Data Containers

  • docker run -v /data
  • VOLUME /data
  • docker run -v /home/tiven/data:/data

Sharing Data

--volumes-from CONTAINER

Data Containers

seed the container with any initial data and ensures permissions are set up correctly.

Delete:

docker rm -v

Common Docker Commands

Engine (docker) CLI

The Software Lifecycle with Docker

Creating a Simple Web App

FROM python:3.4

RUN groupadd -r uwsgi && useradd -r -g uwsgi uwsgi
RUN pip install Flask==0.10.1 uWSGI==2.0.8 requests==2.5.1 redis==2.10.3
WORKDIR /app
COPY app /app
COPY cmd.sh /

EXPOSE 9090 9191
USER uwsgi

CMD ["/cmd.sh"]

Docker Compose

Image Distribution

Running: docker run -d -p 5000:5000 --restart always --name registry registry:2

Tagging: docker tag test/jekyll localhost:5000/test/jekyll

Pushing: docker push localhost:5000/test/jekyll

Continuous Integration and Testing with Docker

Deploying Containers

Provisioning Resources with Docker Machine

Docker Machine

docker-machine ls

docker-machine create --driver virtualbox dev

docker-machine regenerate-certs dev if need

docker-machine env dev

docker-machine env dev | Invoke-Expression

docker info

Logging and Monitoring

Part III. Tools and Techniques

Networking and Service Discovery

Ambassadors

docker-machine create -d virtualbox redis-host

docker-machine env redis-host | Invoke-Expression

docker run -d --name real-redis redis:3

docker run -d --name real-redis-ambassador -p 6379:6379 --link real-redis:real-redis amouat/ambassador

docker-machine ip redis-host

Socat is a command line based utility that establishes two bidirectional byte streams and transfers data between them.

sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file, or input from a pipeline). While in some ways similar to an editor which permits scripted edits (such as ed), sed works by making only one pass over the input(s), and is consequently more efficient.

Service Discovery

etcd

The Raft Consensus Algorithm

etcd is a distributed reliable key-value store for the most critical data of a distributed system.

SkyDNS

SkyDNS is a distributed service for announcement and discovery of services built on top of etcd. It utilizes DNS queries to discover available services. This is done by leveraging SRV records in DNS, with special meaning given to subdomains, priorities and weights.

Consul

Networking Options

Bridge

Docker container networking

References

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