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Build Scalable App with Docker
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allenwei
November 29, 2014
Programming
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Build Scalable App with Docker
allenwei
November 29, 2014
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Transcript
Build Scalable App with Docker Allen Wei
[email protected]
allenwei.cn
About Me • Manager of Groupon Payments China • Ruby
developer • iOS developer • DevOps • twitter: @allenwei • weibo: @魏伦
Docker
Docker
The Twelve Factor App • Setup automation • Portability •
Easy to deploy • Continuous deployment • Scale up easily http://12factor.net/ Adam Wiggins
Disposability Maximize robustness with fast startup and graceful shutdown
Process Execute the app as one or more stateless processes
Backing Services Treat backing services as attached resources
Port binding Export services via port binding
Concurrency Scale out via the process model
Build, release, run Strictly separate build and run stages
Config Store config in the environment
More • Keep development, staging, and production as similar as
possible • Treat logs as event streams • Run admin/management tasks as one-off processes
Problem • Container Management • Service Discovery • Health Check
• Configuration Management
Shipyard
Shipyard
Shipyard
Shipyard
Fig http://fig.sh
Fig
Fig
Fig • fig build • fig up • fig start/stop
• fig scale
Consul https://consul.io/
Service Discovery Consul API DNS
Consul API
Container Register • progrium/registrator • Listen to docker socket •
Register when container started • Unregister when container stop • Register with meta data
Docker Registrator
Docker Registrator
Consul API
Consul API
Consul API
DNS Query
DNS RoundRobin
DNS Lookup
Failure Detection Health Check - Node Health Check - Service
Heath Check
Multi Datacenter Multi DataCenter Agent DataCenter Lookup
Key/Value Storage K/V Database Configuration Management
Key Value Store
Get value Recursively
Use ENV as configuration • Language- and OS-agnostic standard •
More difficult to accidentally commit to a code repo • Environmental variables are easy to change between environments
Demo
Container Management
Cluster Management
Docker in Groupon 2015 Q1
One more thing
A Minimal Operating System Docker Containers Painless Updating Clustered By
Default
Reference • https://hashicorp.com/blog/introducing-consul-template.html • https://github.com/hashicorp/consul-template • https://github.com/progrium/registrator • http://progrium.com/blog/2014/08/20/consul-service-discovery-with-docker/ •
http://progrium.com/blog/2014/07/29/understanding-modern-service- discovery-with-docker/ • https://tech.bellycard.com/blog/load-balancing-docker-containers-with-nginx- and-consul-template/ • http://12factor.net/
Q & A thanks