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flannel
Tom Denham 299c4ec4b3 Merge pull request #656 from tomdee/docs-shuffle 8 anni fa
Documentation bb68236217 Documentation: Split README into multiple files 8 anni fa
backend b616c8bc49 backend/hostgw: Fix memory leak 8 anni fa
dist 92d21600c0 e2e: Allow the backend list to be overridden 8 anni fa
logos 170fd5de88 logos: resized for readme 9 anni fa
network 1bf4e6b6aa vendor: Make code compatible again 8 anni fa
pkg c254deaf7b Correcting format for pkg/ip/ipnet.go 8 anni fa
subnet afc5e0d997 subnet: Move etcd files into their own package. 8 anni fa
vendor fbf578f0df vendor: Revendor with more sensible pinnings 8 anni fa
version cbac427350 Version embedding for Go 1.4 and 1.5 9 anni fa
.dockerignore a8972ad5cd BUILDS: Overhaul build process 8 anni fa
.gitignore 2243d07b41 Builds: Insert libpthread into busybox images 8 anni fa
.travis.yml 56ef07bd0f Makefile: Push tags to flannel-git for all builds 8 anni fa
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Dockerfile.arm 2243d07b41 Builds: Insert libpthread into busybox images 8 anni fa
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glide.yaml fbf578f0df vendor: Revendor with more sensible pinnings 8 anni fa
license-check.sh a8972ad5cd BUILDS: Overhaul build process 8 anni fa
main.go afc5e0d997 subnet: Move etcd files into their own package. 8 anni fa
packet-01.png 82195b1cc4 diagram: update to reflect name change 10 anni fa

README.md

flannel

flannel Logo

Build Status

flannel is a virtual network that gives a subnet to each host for use with container runtimes.

Platforms like Kubernetes assume that each container (pod) has a unique, routable IP inside the cluster. The advantage of this model is that it reduces the complexity of doing port mapping.

Theory of Operation

flannel runs an agent, flanneld, on each host and is responsible for allocating a subnet lease out of a preconfigured address space. flannel uses etcd to store the network configuration, allocated subnets, and auxiliary data (such as host's IP). The forwarding of packets is achieved using one of several strategies that are known as backends. The simplest backend is udp and uses a TUN device to encapsulate every IP fragment in a UDP packet, forming an overlay network. The following diagram demonstrates the path a packet takes as it traverses the overlay network:

Life of a packet

Documenation