nickdenardis / learning-docker

Public notes for my docker learning self

Learning Docker

Public notes for my docker learning self

Getting docker up an running

Use a base CoreOS Vagrant image.

# Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|
  config.vm.box = "coreos"
  config.vm.box_url = "http://storage.core-os.net/coreos/amd64-generic/dev-channel/coreos_production_vagrant.box"
  config.vm.network "private_network",
    ip: "10.10.10.13"

  # This will require sudo access when using "vagrant up"
  config.vm.synced_folder ".", "/home/core/share",
    id: "core",
    :nfs => true,
    :mount_options => ['nolock,vers=3,udp']

  # plugin conflict
  if Vagrant.has_plugin?("vagrant-vbguest") then
    config.vbguest.auto_update = false
    end
end

Get in to vagrant and make sure docker is available

$ vagrant up
$ vagrant ssh
$ docker -v

Basic Docker commands

Running processes

docker ps

All running and previous processes

docker ps -a

All images installed on the machine

docker images

Run a command and exit

docker run ubuntu /bin/bash

Run a command and start a tty interactive session

docker run -t -i ubuntu /bin/bash

Get the difference from a container

docker diff <container id>

Save the changes of an image locally

docker commit <container id> nickdenardis/docker-example:0.1

View all configuration information for a container

docker inspect <container id>

Get the IP address of a container

docker inspect -f "{{.NetworkSettings.IPAddress}}" <container id>

Removing a container

docker rm <container id>

Remove all containers

docker rm $(docker ps -a -q)

Removing an image

docker rmi <container id>

Removing all images

docker rmi $(docker ps -a -q)

Using a Dockerfile to build and start

# Dockerfile

FROM nickdenardis/docker-example:0.1

RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y install nginx

RUN echo "daemon off;" >> /etc/nginx/nginx.conf
RUN mkdir /etc/nginx/ssl
ADD default /etc/nginx/sites-available/default

EXPOSE 80

CMD ["nginx"]

Run and name an image from a Dockerfile in the directory

docker build -t nginx-example .

Forward in a port from outside in and map a shared directory

docker run -v /home/core/share:/var/www:rw -p 80:80 -d nginx-example

Setup for multiple sites on a host

Run the nginx reverse proxy container to field all the requests

docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock jwilder/nginx-proxy

Setup the site folders

mkdir /usr/local/sites/domain/ \
/usr/local/sites/domain/logs \
/usr/local/sites/domain/public/

echo "Hello world!" > /usr/local/sites/domain/public/index.php

Setup the 'data only' container

docker run \
--name domain-data \
-v /usr/local/sites/domain:/data:rw \
dylanlindgren/docker-laravel-data

Setup the 'php' container

docker run \
--privileged=true \
--name domain-php \
--volumes-from domain-data \
-d dylanlindgren/docker-laravel-phpfpm

Setup the 'nginx' container with the ENV var for the host

docker run \
--privileged=true \
--volumes-from domain-data \
-e "VIRTUAL_HOST=domain.com" \
--link domain-php:fpm \
-d dylanlindgren/docker-laravel-nginx