Docker Swarm Meetup (15min lightning)

Swarm: Docker Native Clustering
Mike Goelzer
mgoelzer@docker.com
GH: @mgoelzer
Freenode/Twitter: @mikegoelzer

Swarm: Simplicity, Flexibility, Ease of Setup
• What is Swarm?
• How do you set it up?
• Sample microservice application on Swarm

Swarm turns multiple Docker hosts into a
single, virtual Docker host.

docker daemon
(node-1)
Container
Container
>_
Docker CLI
docker
Docker Compose
Kitematic
Jenkins plugin

docker daemon
(node-1)
Container
Container
>_
Docker CLI
Swarm manager
docker
Docker Compose
Kitematic
Jenkins plugin
docker daemon
(node-0)
Container
Container
docker daemon
(node-2)
Container
Container

Swarm Features
• Scheduling
• Rescheduling on failure
• HA (multiple masters)
• Labels, affinities and constraints to control scheduling decisions
• DNS-based service discovery

Simple: 2 steps to create a cluster
1. Run Swarm Manager
2. Restart your Docker daemons with
some extra arguments

Step 1: Start Swarm manager
docker run -d -p 3375:2375 swarm manage consul://192.168.33.10:8500/
Refs:
https://docs.docker.com/swarm
https://docs.docker.com/swarm/install-manual/

Step 2: Add some args to your daemons
Restart Docker daemons with:
DOCKER_OPTS=
-H=tcp://0.0.0.0:2375
--cluster-store=consul://192.168.33.11:8500
--cluster-advertise=eth1:2375
Refs:
https://docs.docker.com/swarm
https://docs.docker.com/swarm/install-manual/

Example Repo: Microservice App on Swarm
Upcoming Swarm Meetup:
http://www.meetup.com/Docker-Mountain-View/events/228284089/
https://github.com/mgoelzer/swarm-demo-voting-app
Demonstrates a microservice app on Swarm including:
• Vagrantfile and AWS Cloud Formation template to deploy the cluster
• Load balanced web front end
• DNS-based service discovery

Interlock (nginx or ha_proxy)
web01
redis01
web02
redis02
web03
redis03
web04
redis04
web05
redis05
pg results-app
10.0.0.4
10.0.0.3
36.36.36.36
10.0.0.100
10.0.0.5
10.0.0.5
10.0.0.7
10.0.0.6
10.0.0.9
10.0.0.8
10.0.0.11
10.0.0.10
10.0.0.101

Clustered Voting App

Jérôme’s Example: Coin Miner
Slides: http://view.dckr.info/
Repo: https://github.com/jpetazzo/orchestration-workshop
Demonstrates:
• How to do batch workloads on Swarm
• ELK stack for logging and metrics
• Other load balancing patterns beyond Interlock

Mike Goelzer | mgoelzer@docker.com | GH: @mgoelzer | @mikegoelzer

Docker Swarm Meetup (15min lightning)

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