Deploying a Rails app to Docker Cloud

Bartłomiej Skwira @ CodeQuest.com

What is Docker Cloud (aka Tutum)?

Docker Cloud

Not a hosting provider!

Docker Cloud

Orchestration-as-a-Service

Correct title

Deploying a Rails app to with Docker Cloud

Best of IaaS and PaaS

Benefits of Docker Cloud

PaaS - Easy build, deploy

IaaS - Flexible infrastructure

Benefits of Docker Cloud

Which providers are supported?

Amazon Web Services
DigitalOcean
Microsoft Azure
Packet.net
IBM SoftLayer
own provider

Magement tools

Online dashboard

Magement tools

CLI

Management tools

Restful and Stream API

How to deploy?

1. Linking a provider (IaaS)

Add provider

Settings -> Cloud Providers -> Connect Provider

Authorize service

2. Creating a node (cluster) - theory

What is a node?

A linux host on which your app runs

What is a node cluster?

Collection of nodes of the same type and provider

What is a service?

Group of containers from the same image

What is a stack?

Group of services ~= application

2. Creating a node (cluster) - how to?

First node/cluster

First node - status

3. Creating a service - how to?

Choose image

Service properties

Behold a service!

Container console

Stackfile

yaml file that defines one or more services

Stackfile example

Haproxy

web:
  image: 'dockercloud/hello-world:latest'
  target_num_containers: 2
lb:
  image: 'dockercloud/haproxy:1.5.3'
  links:
    - web
  ports:
    - '80:80'
  roles:
    - global

*Bonus - copy files to a remote container

Attempt 1

gzip + password the file
upload file to a public hosting
install curl on the web container (one with exposed 80 port)
download file with curl in the container console
unarchive

Attempt 1

Attempt 2

Docker way!

I. authorizedkeys

$ docker run -v /root:/user -e AUTHORIZED_KEYS=" \
  `cat ~/.ssh/id_rsa.pub`" dockercloud/authorizedkeys

authorizedkeys:
  image: dockercloud/authorizedkeys
  deployment_strategy: every_node
  autodestroy: always
  environment:
    - AUTHORIZED_KEYS=ssh-rsa AAAAB3NzaC1y....
  volumes:
    - /root:/user:rw

II.I get node IP

II.II scp the file

$ scp production_db root@46.101.104.219:/path

III. ssh into node

$ ssh root@46.101.104.219

Welcome to Ubuntu 14.04.5 LTS (GNU/Linux 4.4.0-78-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Sun Jul  2 11:43:50 UTC 2017

  System load:                    0.03
  Usage of /:                     13.0% of 29.40GB
  Memory usage:                   77%
  Swap usage:                     0%
  Processes:                      147
  Users logged in:                0
  IP address for eth0:            207.154.214.150
  IP address for eth1:            10.135.8.27
  IP address for docker0:         172.17.0.1
  IP address for weave:           10.7.255.254
  IP address for docker_gwbridge: 172.18.0.1

  Graph this data and manage this system at:
    https://landscape.canonical.com/

31 packages can be updated.
25 updates are security updates.

Your Hardware Enablement Stack (HWE) is supported until April 2019.

Last login: Sun Jul  2 10:33:22 2017 from 78-10-217-220.static.ip.netia.com.pl
root@00f64e06-58c2-4936-92c7-538965d7a706:~#

IV. docker cp

$ docker cp production_db container_name:/path/production_db

V. PROFIT!

Reference

https://blog.codeship.com/tutum-aka-docker-cloud/
https://docs.docker.com/docker-cloud/getting-started/intro_cloud
https://docs.docker.com/docker-cloud/getting-started/your_first_service
https://docs.docker.com/docker-cloud/apps/stack-yaml-reference/