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https://github.com/kubernetes/dns

Kubernetes DNS service
https://github.com/kubernetes/dns

dns k8s kube-dns kubernetes

Last synced: about 2 months ago
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Kubernetes DNS service

Host: GitHub
URL: https://github.com/kubernetes/dns
Owner: kubernetes
License: apache-2.0
Created: 2016-12-15T21:20:19.000Z (almost 8 years ago)
Default Branch: master
Last Pushed: 2024-06-17T11:40:10.000Z (3 months ago)
Last Synced: 2024-06-20T10:17:48.015Z (3 months ago)
Topics: dns, k8s, kube-dns, kubernetes
Language: Go
Homepage:
Size: 32.2 MB
Stars: 891
Watchers: 42
Forks: 457
Open Issues: 17
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: code-of-conduct.md
- Security: SECURITY_CONTACTS

Awesome Lists containing this project

README

        # Kubernetes DNS

[![Build Status](https://travis-ci.org/kubernetes/dns.svg?branch=master)](https://travis-ci.org/kubernetes/dns)

[![Coverage Status](https://coveralls.io/repos/github/kubernetes/dns/badge.svg?branch=master)](https://coveralls.io/github/kubernetes/dns?branch=master)

[![Go Report Card](https://goreportcard.com/badge/github.com/kubernetes/dns)](https://goreportcard.com/report/github.com/kubernetes/dns)

This is the repository for [Kubernetes DNS(kube-dns and nodelocaldns)](https://kubernetes.io/docs/tasks/access-application-cluster/configure-dns-cluster/).

## Images

* [kube-dns](https://kubernetes.io/docs/tasks/access-application-cluster/configure-dns-cluster/)

* [sidecar](docs/sidecar/README.md)

* [dnsmasq](images/dnsmasq)

* [node-cache](https://kubernetes.io/docs/tasks/administer-cluster/nodelocaldns/)

## Building

`make` targets:

| target | description |

| ---- | ---- |

|all, build   | build all binaries |

|test         | run unit tests |

|containers   | build the containers |

|images-clean | clear image build artifacts from workdir |

|push         | push containers to the registry |

|help         | this help message |

|version      | show package version |

|{build,containers,push}-ARCH | do action for specific ARCH |

|all-{build,containers,push}  | do action for all ARCH |

|only-push-BINARY             | push just BINARY |

* Setting `VERBOSE=1` will show additional build logging.

* Setting `VERSION` will override the container version tag.

## Vulnerability patching

Vulnerability patches are mainly for debian-base or debian-iptables images. They can be updated to the latest by modifying [rules.mk](https://github.com/kubernetes/dns/blob/master/rules.mk#L32-L33) and [dnsmasq Makefile](https://github.com/kubernetes/dns/blob/f44ede5f559a9a29fa23b438e6ce0cb70934d834/images/dnsmasq/Makefile#L30-L32).

[Example PR](https://github.com/kubernetes/dns/pull/475).

Once the PR has merged, a new release tag should be cut. The rest of the release process is described below.

## Release process

Follow these steps to make changes and release a new binary.

1. Make the necessary code changes and create a PR.

2. Build and test locally (`make images-clean`; `make build`; `make containers`; `make test`). 

3. To build just the node-cache container, use `make containers CONTAINER_BINARIES=node-cache`.

4. The same steps are executed via the presubmit script `presubmits.sh` which is run by the [test-infra prow job.](https://github.com/kubernetes/test-infra/blob/88cd2798f36010e071a30c9827f90e647b59fc65/config/jobs/kubernetes/sig-network/sig-network-misc.yaml#L182)

5. Merge the PR.

6. Cut a new release tag. We use [semantic versioning](http://semver.org) to

   name releases.

   Example:

   ```

   git tag -a 1.21.4 -m "Build images using golang 1.17."

   git push upstream 1.21.4

   ```

4. Wait for container images to be pushed via cloudbuild yaml. This will be done automatically by

   `k8s.io/test-infra/.../k8s-staging-dns.yaml`. A manual cloud build can be submitted via

   `gcloud builds submit --config cloudbuild.yaml`, but this requires owner permissions in k8s-staging-dns project.

   The automated job pushes images for all architectures and makes them available in `gcr.io/k8s-staging-dns`.

   Status for build jobs can be checked at - https://testgrid.k8s.io/sig-network-dns#dns-push-images

5. Promote the images to `gcr.io/k8s-artifacts-prod` using the process described

   in [this](https://github.com/kubernetes/k8s.io/tree/main/k8s.gcr.io#image-promoter) link.

   The image SHAs should be added to [`images/k8s-staging-dns/images.yaml`](https://github.com/kubernetes/k8s.io/blob/main/registry.k8s.io/images/k8s-staging-dns/images.yaml).

   The SHAs can be obtained by running the command `python parse-image-sha.py `

   This will return the SHAs for kube-dns as well as node-cache images. Node-cache images are always promoted, kube-dns images are promoted if there is a change to kubedns/vulnerability fix.

6. Images will be available in the repo registry.k8s.io/dns/. The node-cache image with tag 1.15.14 can be found at registry.k8s.io/dns/k8s-dns-node-cache:1.15.14. Older versions are at registry.k8s.io/k8s-dns-node-cache:

7. Submit a PR for the kubernetes/kubernetes repository to switch to the new

   version of the containers. Example - https://github.com/kubernetes/kubernetes/pull/106189

   

## Version compatibility

There is no version compatibility requirements with Kubernetes releases. Version numbers in this repo are not related to Kubernetes versions.