Docker Swarm Mode
Docker Meetup Hamburg · September 13th, 2016
Thilo-Alexander Ginkel · TG Byte Software GmbH
thilo.ginkel@tgbyte.de · www.tgbyte.de
About us
TG Byte Software GmbH
Founded in 1998, located in Hamburg
Service Range
Software Development & Consulting
DevOps
Training & Coaching
Looking for freelancers to support us with various projects
Thilo-Alexander Ginkel
Passionate Software Engineer, IT Consultant & Trainer
Focus
Software Development & Architecture
DevOps
Troubleshooting
Software Development since 1994
Docker Swarm Mode
Docker Swarm Mode
Cluster management integrated with Docker Engine
Accessible via the regular Docker CLI
Built on top of SwarmKit (using Raft Consensus Algorithm)
Self-organizing (no dedicated cluster coordinator required)
New "service" concept as an abstraction on top of containers
Multi-host overlay networking
Service Discovery via DNS
Introduced in Docker 1.12
Not to be confused with the standalone Docker Swarm product
Docker Swarm Mode
Services
Docker Swarm Mode
New HEALTHCHECK Directive
Enables Docker Engine to assess the health state of a container
Exit code indicates success (exit code 0) or failure (exit code 1)
Enables Docker Swarm Mode to direct inbound traffic only to healthy containers
Example
HEALTHCHECK --interval=15s --timeout=5s CMD curl --fail \
http://localhost:2368/ || exit 1Demo
Demo
Setup
Stateful web application
"Ghost" blogging platform
MySQL database
Three nodes on Google Compute Engine
Running Docker 1.12.1 in Swarm Mode
Google Cloud load balancing for HTTPS termination and (pseudo-)HA
Demo
Wrap-up & Outlook
Questions?
Thank you!
Docker Consulting & Training
