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Docker for Ops: Docker Networking
Deep Dive
Madhu Venugopal
Jana Radhakrishnan
Overview
What is libnetwork
New features in 1.12
Agenda
Deep Dive
Multihost networking
Secure Control Plane
Secure Data plane
Service Discovery
Native Loadbalacing
Routing Mesh
Finish
Demo
Q&A
Overview
It is not just a driver interface
• Docker networking fabric
• Defines Container Networking Model
• Provides builtin IP address management
• Provides native multi-host networking
• Provides native Service Discovery and Load Balancing
• Allows for extensions by the ecosystem
What is libnetwork?
New features in 1.12 swarm mode
CNM
Routing
Mesh
Multi-host
Networking
without external
k/v store
Service
Discovery
Secure
Data-Plane
Secure
Control-Plane
Load
Balancing
• Cluster aware
• De-centralized control
plane
• Highly scalable
Macvlan driver
• Out of experimental
• Integrates with Underlay
• Place containers in your
existing vlans
MacVlan
# Create a macvlan network
$ docker network create -d macvlan 
--subnet=192.168.0.0/16 
—-ip-range=192.168.41.0/24 
--aux-address="favorite_ip_ever=192.168.41.2" 
--gateway=192.168.41.1 
-o parent=eth0.41 macnet41
# First address is the specified gateway, second is aux
$ docker run --net=macnet41 -it --rm alpine /bin/sh
Deep Dive
Multi-host networking
Manager
Network
Create
Orchestrator
Allocator
Scheduler
Dispatcher
Service
Create
Task
Create
Task
Dispatch
Task
Dispatch
Gossip
Worker1 Worker2
Engine
Libnetwork
Engine
Libnetwork
• The VXLAN based data path
remains unchanged
• No external key-value store
necessary
• Central resource allocation
• Improved performance
• Highly scalable
• Gossip based protocol
• Network scoped
• Fast convergence
• Secure by default
• periodic key rotations
• swarm native key-exchange
• Highly scalable
Network control plane Cluster Scope Gossip
W1
W2
W3
W1
W5
W4
Network Scope Gossip
Network Scope Gossip
• Available as an option during
overlay network creation
• Uses kernel IPSec modules
• On-demand tunnel setup
• Swarm native key-exchange
• Periodic key rotations
• Highly performant
Secure dataplane
Worker1
Worker2
Worker3
secure
network
secure
network
IPSec Tunnel
IPSec Tunnel
IPSec Tunnel
secure
network
secure
network
non-
secure
network
non-
secure
network
Open UDP traffic
• Provided by embedded DNS
• Highly available
• Uses Network Control Plane to learn state
• Can be used to discover both tasks and
services
Service Discovery
engine
DNS Server
DNS Resolver DNS Resolver
DNS requests
• Provided by embedded DNS
• Highly available
• Uses Network Control Plane to learn state
• Can be used to discover both tasks and
services
• Minimal Overhead because of CNM
• Can use DNS RR instead as an option
Internal Load balancer Task1
Service
A
Task2
Service
A Task3
Service
A
Client1 Client2
VIP LB VIP LB
• Builtin routing mesh for edge routing
• Worker nodes themselves participate in
ingress routing mesh
• All worker nodes accept connection
requests on PublishedPort
• Port translation happens at the worker
node
• Same internal load balancing mechanism
used to load balance external requests
Routing mesh
External
Loadbalancer
(optional)
Task1
ServiceA Task1
ServiceA
Task1
ServiceA
Worker1 Worker2
Ingress Network
8080 8080
VIP LB VIP LB
8080->80 8080->80
Finish
Demo and Q&A
Thank you!

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Docker for Ops: Docker Networking Deep Dive, Considerations and Troubleshooting by Madhu Venugopal and Jana Radhakrishnan

  • 1. Docker for Ops: Docker Networking Deep Dive Madhu Venugopal Jana Radhakrishnan
  • 2. Overview What is libnetwork New features in 1.12 Agenda Deep Dive Multihost networking Secure Control Plane Secure Data plane Service Discovery Native Loadbalacing Routing Mesh Finish Demo Q&A
  • 4. It is not just a driver interface • Docker networking fabric • Defines Container Networking Model • Provides builtin IP address management • Provides native multi-host networking • Provides native Service Discovery and Load Balancing • Allows for extensions by the ecosystem What is libnetwork?
  • 5. New features in 1.12 swarm mode CNM Routing Mesh Multi-host Networking without external k/v store Service Discovery Secure Data-Plane Secure Control-Plane Load Balancing • Cluster aware • De-centralized control plane • Highly scalable
  • 6. Macvlan driver • Out of experimental • Integrates with Underlay • Place containers in your existing vlans
  • 7. MacVlan # Create a macvlan network $ docker network create -d macvlan --subnet=192.168.0.0/16 —-ip-range=192.168.41.0/24 --aux-address="favorite_ip_ever=192.168.41.2" --gateway=192.168.41.1 -o parent=eth0.41 macnet41 # First address is the specified gateway, second is aux $ docker run --net=macnet41 -it --rm alpine /bin/sh
  • 9. Multi-host networking Manager Network Create Orchestrator Allocator Scheduler Dispatcher Service Create Task Create Task Dispatch Task Dispatch Gossip Worker1 Worker2 Engine Libnetwork Engine Libnetwork • The VXLAN based data path remains unchanged • No external key-value store necessary • Central resource allocation • Improved performance • Highly scalable
  • 10. • Gossip based protocol • Network scoped • Fast convergence • Secure by default • periodic key rotations • swarm native key-exchange • Highly scalable Network control plane Cluster Scope Gossip W1 W2 W3 W1 W5 W4 Network Scope Gossip Network Scope Gossip
  • 11. • Available as an option during overlay network creation • Uses kernel IPSec modules • On-demand tunnel setup • Swarm native key-exchange • Periodic key rotations • Highly performant Secure dataplane Worker1 Worker2 Worker3 secure network secure network IPSec Tunnel IPSec Tunnel IPSec Tunnel secure network secure network non- secure network non- secure network Open UDP traffic
  • 12. • Provided by embedded DNS • Highly available • Uses Network Control Plane to learn state • Can be used to discover both tasks and services Service Discovery engine DNS Server DNS Resolver DNS Resolver DNS requests
  • 13. • Provided by embedded DNS • Highly available • Uses Network Control Plane to learn state • Can be used to discover both tasks and services • Minimal Overhead because of CNM • Can use DNS RR instead as an option Internal Load balancer Task1 Service A Task2 Service A Task3 Service A Client1 Client2 VIP LB VIP LB
  • 14. • Builtin routing mesh for edge routing • Worker nodes themselves participate in ingress routing mesh • All worker nodes accept connection requests on PublishedPort • Port translation happens at the worker node • Same internal load balancing mechanism used to load balance external requests Routing mesh External Loadbalancer (optional) Task1 ServiceA Task1 ServiceA Task1 ServiceA Worker1 Worker2 Ingress Network 8080 8080 VIP LB VIP LB 8080->80 8080->80