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Docker Networking
Agenda
• Introduction
• Networking Deep Dive
• Ecosystem
• Q&A
Introduction
Why is Networking important?
• Traditional Networking is incredibly vast and complex
• But, Networking is inherent part of distributed applications
• Make it developer-friendly & application driven.
“We'll do for Networking,
What Docker did for
Compute.”
Goals
• Make "network" a first class object
• Provide a pluggable networking stack
• Span networks across multiple hosts
• Support multiple platforms
Libnetwork
• Open Sourced in April
• Over 200 Pull Requests
• Over 200 GitHub Stars
• Windows and FreeBSD ports in progress
Whats New?
• Updated Networking Stack in Docker
• Create Networks using the Docker CLI
• Multi-host Networking
• Services UI
blue = experimental
Networking Deep Dive
What is Libnetwork
• Library for creating and managing network
stacks for containers
• Test daemon/client called "dnet"
• Driver-based networking
• Implements the Container Network Model
Container Network Model
(CNM)
• Cluster
• Network
• Endpoint (Service)
• Sandbox
Create
Network
Create
Container
Defer to
Driver
Defer to
Driver
Service Discovery
• Libnetwork native service discovery
• Implemented using standard DNS protocols
• Network is a service discovery domain
• Independent of network drivers
Libnetwork API
• libnetwork.New
• controller.ConfigureNetworkDriver
• controller.NewNetwork
• network.CreateEndpoint
• endpoint.Join
RESTful API
• Provides CRUD for Networks and Endpoints
• /network
• /network/<network_id>/endpoints
• /network/<network_id>/endpoints/<endpoint_id>
• /network/<network_id>/endpoints/<endpoint_id>/containers
• /services
• /services/<service_id>
• /services/<service_id>/backends
Drivers
• Drivers implement the Driver API
• They provide the specifics of how a network
and endpoint are implemented
Bridge Driver
• Creates a Linux Bridge for each network
• Creates a veth pair for each endpoint
- One end is attached to the bridge
- The other appears as eth0 inside the containers
• iptables rules created for NAT
Overlay Driver
• Creates a separate network namespace for every network
- Facilitates overlapping IP address space across networks
• Creates a Linux Bridge and VXLAN tunnels to every other discovered host
• Creates a veth pair for each endpoint
- One end is attached to the bridge
- The other appears as eth0 inside the container
• Network namespace connected to host network using NAT
- Facilitates exiting the overlay network at every host(for external connectivity)
Network Plugins
• Implemented using libnetwork's remote driver
• Uses JSON-RPC transport
• Can be written in any language
• Can be deployed as a container
Demo
Roadmap
• Exit experimental
• Introduce label support to networks/services
• Seamless cluster bootstrap
• Introduce addition driver extension points
• IPAM
• Service discovery
• User controllable network parameters like subnets
• Troubleshooting tools
Call to Action!
• Try the Docker Experimental Channel!
- https://experimental.docker.com
• Contribute to libnetwork
- Raise an Issue or Submit a Pull Request
• Chat with us on IRC
- #docker-network on Freenode
Q&A
Thank you

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Docker Online Meetup #22: Docker Networking

  • 2. Agenda • Introduction • Networking Deep Dive • Ecosystem • Q&A
  • 4. Why is Networking important? • Traditional Networking is incredibly vast and complex • But, Networking is inherent part of distributed applications • Make it developer-friendly & application driven.
  • 5. “We'll do for Networking, What Docker did for Compute.”
  • 6. Goals • Make "network" a first class object • Provide a pluggable networking stack • Span networks across multiple hosts • Support multiple platforms
  • 7. Libnetwork • Open Sourced in April • Over 200 Pull Requests • Over 200 GitHub Stars • Windows and FreeBSD ports in progress
  • 8. Whats New? • Updated Networking Stack in Docker • Create Networks using the Docker CLI • Multi-host Networking • Services UI blue = experimental
  • 10. What is Libnetwork • Library for creating and managing network stacks for containers • Test daemon/client called "dnet" • Driver-based networking • Implements the Container Network Model
  • 11. Container Network Model (CNM) • Cluster • Network • Endpoint (Service) • Sandbox
  • 13. Service Discovery • Libnetwork native service discovery • Implemented using standard DNS protocols • Network is a service discovery domain • Independent of network drivers
  • 14. Libnetwork API • libnetwork.New • controller.ConfigureNetworkDriver • controller.NewNetwork • network.CreateEndpoint • endpoint.Join
  • 15. RESTful API • Provides CRUD for Networks and Endpoints • /network • /network/<network_id>/endpoints • /network/<network_id>/endpoints/<endpoint_id> • /network/<network_id>/endpoints/<endpoint_id>/containers • /services • /services/<service_id> • /services/<service_id>/backends
  • 16. Drivers • Drivers implement the Driver API • They provide the specifics of how a network and endpoint are implemented
  • 17. Bridge Driver • Creates a Linux Bridge for each network • Creates a veth pair for each endpoint - One end is attached to the bridge - The other appears as eth0 inside the containers • iptables rules created for NAT
  • 18. Overlay Driver • Creates a separate network namespace for every network - Facilitates overlapping IP address space across networks • Creates a Linux Bridge and VXLAN tunnels to every other discovered host • Creates a veth pair for each endpoint - One end is attached to the bridge - The other appears as eth0 inside the container • Network namespace connected to host network using NAT - Facilitates exiting the overlay network at every host(for external connectivity)
  • 19. Network Plugins • Implemented using libnetwork's remote driver • Uses JSON-RPC transport • Can be written in any language • Can be deployed as a container
  • 20. Demo
  • 21. Roadmap • Exit experimental • Introduce label support to networks/services • Seamless cluster bootstrap • Introduce addition driver extension points • IPAM • Service discovery • User controllable network parameters like subnets • Troubleshooting tools
  • 22. Call to Action! • Try the Docker Experimental Channel! - https://experimental.docker.com • Contribute to libnetwork - Raise an Issue or Submit a Pull Request • Chat with us on IRC - #docker-network on Freenode
  • 23. Q&A