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Docker at Spotify
!
Rohan Singh
@rohansingh
Spotify
“Music for every moment”
!
40+ million active users
!
20+ million songs available
(we’re in 55+ countries, differs by market)
!
Live in the US for 2 years
2
What are we working with?
!
100+ distinct backend services
!
5000+ production servers in 4 sites worldwide
!
Almost 300 servers per ops engineer
3
Deployment at Spotify
4
Build Debian packages
!
Requisition new hardware
!
Use combination of Puppet
and internal tooling (deployify)
5
old way:
SSH to a bunch of machines,
apt-get install || upgrade
!
deployify:
Uses fabric, which just SSH’s,
runs apt-get install || upgrade
6
What’s wrong with that?
7
Requisitioning new hardware is slow
!
Hardware utilization is low
!
We’ve automated and improved,
but still too slow
8
Deployments often fail…
!
…though usually only partially
9
!
Machines get denormalized easily
10
Debian packaging is its own special hell
So many damn files!
!
debhelper
!
Distro & version specific
!
apt-get update
11
What do we want?
12
Deployments that are:
!
Repeatable
!
Straightforward
!
Fault-tolerant
13
Why Docker?
!
It gives us “repeatable”,
right out of the box
!
!
And it’s fairly straightforward, too!
14
Repeatability?
!
!
The code you test isn’t necessarily
the code that runs in prod
15
Repeatability — Docker
!
Build an image
!
Run tests against the image
!
Run the tested image in prod
16
Straightforward
!
Just one Dockerfile
!
Pretty simple syntax
!
Immutable images — easy to reason about
17
Fault-tolerance?
Even if your code is perfect,
deployments might fail
!
Puppet or Debian repos are down
!
Network issues
!
The machine dies
18
Fault-tolerance — Docker
Just one thing has to work —
pulling & running an image
!
If it fails, just try again
!
No machines left in weird states*
!
!
*(in theory)
19
What more do we need?
20
Deploying Docker containers across
our entire fleet of servers
!
Some way to deal with Docker or container failures
!
That’s pretty much it
21
Looking around for a Docker platform
Several really feature-full offerings
!
Pretty opinionated and all-encompassing
!
All we need is reliably deploying containers
to a fleet of Docker hosts
22
Helios
23
Makes sure your containers are deployed & running
exactly where you want them…
!
…and that’s pretty much it
!
!
github.com/spotify/helios
24
What’s in the box?
Helios master
frontend that you talk to
!
Helios agent
runs alongside each Docker instance
!
Zookeeper
!
Straightforward CLI
25
How does it work?
Create a job —
tell Helios which Docker image to deploy
!
Deploy the job —
tell Helios where to run the Docker containers
26
See it in action
27
What’s next?
28
Helios is just the beginning
!
Brought up plenty of Helios+Docker agents
in our private cloud for our devs
!
Integrated Helios with JUnit —
write JUnit tests run against Docker containers
29
Dockerized integration tests
30
This week —
first Helios+Docker-based service in production
!
!
In the future —
Containerizing more of our infrastructure
31
Give it a go
Open source:
github.com/spotify/helios
!
Try it out:
git clone https://github.com/spotify/helios.git 
&& cd helios && vagrant up
!
!
!
Come play with us (spotify.com/jobs)
32

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