cert-manager is a Kubernetes add-on to automate the management and issuance of TLS certificates from various issuing sources.

It will ensure certificates are valid and up to date periodically, and attempt to renew certificates at an appropriate time before expiry.

It is loosely based upon the work of kube-lego and has borrowed some wisdom from other similar projects e.g. kube-cert-manager.

This project is not yet ready to be a component in a critical production stack, however it is at a point where it offers comparable features to other projects in the space. If you have a non-critical piece of infrastructure, or are feeling brave, please do try cert-manager and report your experience here in the issue section.

NOTE: currently we provide no guarantees on our API stability. This means there may be breaking changes that will require changes to all Issuer/Certificate resources you have already created. We aim to provide a stable API after a 1.0 release.

Documentation for cert-manager can be found at cert-manager.readthedocs.io. Please make sure to select the correct version of the documentation to view on the bottom left of the page.

If you encounter any issues whilst using cert-manager, and your issue is not documented, please file an issue.

We welcome pull requests with open arms! There's a lot of work to do here, and we're especially concerned with ensuring the longevity and reliability of the project.

Please take a look at our issue tracker if you are unsure where to start with getting involved!

We also use the #cert-manager channel on kubernetes.slack.com for chat relating to the project.

Developer documentation is available in the official documentation.

The list of releases is the best place to look for information on changes between releases.