What is flannel built with?

Q: Which repos have a stack like flannel's?

The ones that share most of its stack: k3s-io/k3s, moby/moby, and containerd/containerd.

flannel is a Go repo built with net/http. It is tested with github.com/onsi/ginkgo/v2, github.com/onsi/gomega, go.etcd.io/etcd/tests/v3, and github.com/jonboulle/clockwork, deploys with k8s.io/klog/v2, github.com/Microsoft/hcsshim, github.com/containernetworking/plugins, github.com/coreos/go-systemd/v22, and github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common, and uses etcd. It has 19,318 written lines, with 38 test files.

Read on November 14, 2026, at commit dc074a9. Read it as markdown

The card says what it's built with. Its whole map opens it up: every part of the code and how it connects to the rest.

Backend

The base 1

net/http

Data 1

etcd2 files

Support

Testing 4

go.etcd.io/etcd/tests/v32 files
github.com/onsi/ginkgo/v211 files
github.com/onsi/gomega8 files
github.com/jonboulle/clockwork1 file

Deploy 5

github.com/containernetworking/plugins1 file
github.com/coreos/go-systemd/v221 file
k8s.io/klog/v236 files
github.com/Microsoft/hcsshim4 files
github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common1 file

Tools 1

sigs.k8s.io/kind1 file

Other 15

github.com/pkg/errors2 files
github.com/avast/retry-go/v51 file
github.com/coreos/pkg1 file
Google1 file
github.com/vishvananda/netlink10 files
k8s.io/apimachinery3 files
github.com/coreos/go-iptables2 files
golang.org/x/sys2 files
sigs.k8s.io/knftables2 files
github.com/joho/godotenv1 file
github.com/vishvananda/netns1 file
golang.org/x/sync1 file

3 more

golang.zx2c4.com/wireguard/wgctrl1 file
k8s.io/api1 file
k8s.io/client-go1 file

Other repos with a similar stack

Ordered by how much of its stack they share with flannel, then by stars.

k3s-iok3s
34.4k
Lightweight Kubernetes
5 of 27 in commonCompare →
mobymoby
72.3k
The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems
4 of 27 in commonCompare →
containerdcontainerd
21.5k
An open and reliable container runtime
4 of 27 in commonCompare →
rclonerclone
61k
"rsync for cloud storage" - Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Azure Blob, Azure Files, Yandex Files
3 of 27 in commonCompare →
pingcaptidb
40.7k
TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.
3 of 27 in commonCompare →
istioistio
38.5k
Connect, secure, control, and observe services.
3 of 27 in commonCompare →

Frequently asked questions

What language is flannel written in?

flannel is written in Go, with 19,318 written lines.

What framework does flannel use?

flannel is built with net/http.

What services does flannel use?

flannel uses etcd.

Does flannel have tests?

Yes. flannel has 38 test files and is tested with github.com/onsi/ginkgo/v2, github.com/onsi/gomega, go.etcd.io/etcd/tests/v3, and github.com/jonboulle/clockwork.

Which repos have a stack like flannel's?

The ones that share most of its stack:k3s-io/k3s moby/moby containerd/containerd