apt get no more let vagrant, puppet and docker take the stage
TRANSCRIPT
ROME 27-28 march 2015
Alessandro Cinelli (cirpo)
Apt-get no more let Vagrant, Puppet and Docker take the stage
“it works on my machine”
Titlesubtitle
“Everything is written in the
README”
“Everything is written in the wiki”
Titlesubtitle
“oh shit, I forgot to update XYZ”
Titlesubtitle
“cool this opensource project on github… how can I run it?”
“I don’t f*#c?ing care about the platform,
I want to build something cool
NOW!”
SOLUTIONS?
REMOTE MACHINES
https://www.flickr.com/photos/mysterybee/1659329016
VIRTUAL MACHINES
BUT VIRTUAL MACHINES COULD BE
HUUUUUUGE
enter
“Create and configure lightweight, reproducible, and portable development
environments.”
YOU CAN HAVE A VM WITH FEW Kbs
download and install vagrant
download and install vagrant
create a Vagrantfile
download and install vagrant
create a Vagrantfile
run “vagrant up”
download and install vagrant
create a Vagrantfile
run “vagrant up”
enjoy
VagrantFile
VagrantFilevm box name
VagrantFile
base box urlvm box name
VagrantFile
base box urlvm box name
vm ip
VagrantFile
base box urlvm box name
vm ipshared folder
VagrantFile
base box urlvm box name
vm ipshared folder
vm ram
VagrantFile
base box urlvm box name
vm ipshared folder
vm ramvm #cpus
BOXES
BOXES
AUTOMATE SETUP
PROCESS
(PROVISIONING)
PROVISIONERS
VM
$ vagrant up
provisioners
$ ssh
thanks Rohit Dantas
how to automate the provisioning?
X
IF THE STACK DOESN’T CHANGE TOO MUCH JUST PROVIDE A READY MADE VM MACHINE… THE PROVISIONER WILL ONLY CHANGE CONFIG FILES
BUILD A NEW MACHINE IF YOU HAVE TO UPGRADE/ADD A SERVICE
“Operating-system-level virtualisation is a virtualisation method where the kernel of an
operating system allows for multiple isolated user space instances, instead of just one.
Such instances, often called CONTAINERS, or jails, may look and feel like a real server from
the point of view of its owners and users.”
http://en.wikipedia.org/wiki/Docker_%28software%29
lego
ONE CONTAINER =
ONE COMMAND
DIFFERENCE BETWEEN A VM AND DOCKER
HOST OS
GUEST OS
HYPERVISOR
BIN/ LIBS
APP A
APP CAPP B
GUEST OS
BIN/ LIBS
APP Z
APP HAPP B
GUEST OS
BIN/ LIBS
APP A
APP DAPP L
HOST OSDOCKER ENGINE
BIN/ LIBS
APP ABIN/ LIBS
APP ZBIN/ LIBS
APP DBIN/ LIBS
APP B{ {
VM
VS
(VM)
FIGHT IMAGE
environment dev all (dev, staging, live)
boot speed minutes seconds
host dependency almost everywhere linux
VS
Full isolation and garanteed resources ?
Then go with vagrant/VM
VS
Isolated processes and tons of them?
Then go with Docker
THE DOCKER CREW INVENTED CONTAINERS?
THE DOCKER CREW INVENTED CONTAINERS?
no
THE DOCKER CREW INVENTED CONTAINERS?
NO
Linux CONTAINERS (LCX)
came from FreeBsd jails and chroot, at least 5 years ago
used by Heroku(PaaS)
Docker is a great, super mega awesome way to orchestrate containers
numbers
DIFFERENCE BETWEEN DOCKER AND A VM
WITH DOCKER YOU DON’T HAVE THE
OVERHEAD GIVEN BY THE VIRTUALISATION
DockerFile
DockerFilecontainer image
DockerFilecontainer image
commands while building the container }
DockerFilecontainer image
commands while building the container
copy some content while building the container
}
DockerFilecontainer image
commands while building the container
copy some content while building the container
declare a volume: data accessible by other containers and useful to mount a filesystem
}
DockerFilecontainer image
commands while building the container
copy some content while building the container
declare a volume: data accessible by other containers and useful to mount a filesystem
environment variable
}
DockerFilecontainer image
commands while building the container
copy some content while building the container
declare a volume: data accessible by other containers and useful to mount a filesystem
environment variablecontainer port exposed to other containers
}
DockerFilecontainer image
commands while building the container
copy some content while building the container
declare a volume: data accessible by other containers and useful to mount a filesystem
environment variablecontainer port exposed to other containers
the container command executed when you run it
}
Build the container:
$: docker build -t node-app .
Run the container:
$: docker run -it node-app
Build another container:
$: docker build -t my-redis .
Run the container:
$: docker run -it my-redis
Link them and enjoy:
$: docker run --link my-redis:redis -p 9200:9200 -d node-app
DEMO
windows 98 bsod
+
why vagrant and docker?
YES YOU CAN!
Docker still requires Linux kernel 3.8 or higher.
This bounds considerably the environments Docker can
natively run on.
BUT YOU SHOULDN’T…
docker-compose (prev fig)
dubai
dubai
namshi
namshinamshi
SOA
Service Oriented Architechture
DOCKER IS A PERFECT MATCH!
DOCKER IS A PERFECT MATCH!
EVEN FOR DEVELOPMENT
fake service? no problemDO YOU NEED TO FAKE A
SERVICE?
NO PROBLEM, JUST SPIN UP A CONTAINER IN NO TIME
NGINX-PROXY
APIDOC (DEMO)
APIDOC (DEMO)
NGINX-PROXY
DOCKER PROSMatter of seconds to start an image
Can start multiple copies immediately
Central repo for images
You can go on staging and live from dev with the same container
Versioning
DOCKER CONS
It really works really well just on Linux atm
It’s a young project, things change very fast
Lack of proper management tool
DOCKER CONS
It really works really well just on Linux atm
It’s a young project, things change very fast
Lack of proper management tool
boot2docker
Kitematic
github.com/namshi/node-dock
node-dock
NODE-DOCK
Docker disk space cleanup
$: docker rm $(docker ps -a -q)
$: docker images | grep "<none>" | awk '{ print "docker rmi " $3 }' | bash
https://github.com/dummymael/dotfiles/blob/1859a36afba2252f86a0a1ff8d5fb442e74b7a0e/tools/
docker_clean_vfs.py
$: pip install docker-py
THANKS!
credits
http://blog.docker.com/media/Docker_Infographic_FINAL.jpg
https://www.flickr.com/photos/chuddlesworth/7059061549
Tim Haak https://speakerdeck.com/timhaak/vagrant-is-so-last-year-why-arent-you-using-docker-yet
Rohit Dantas https://speakerdeck.com/rohitdantas