Automatically provision and manage TLS certificates in Kubernetes
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README.md

cert-manager

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.

cert-manager high level overview diagram

Current status

As this project is pre-1.0, we do not currently offer strong guarantees around our API stability.

Notably, we may choose to make breaking changes to our API specification (i.e. the Issuer, ClusterIssuer and Certificate resources) in new minor releases.

These will always be clearly documented in the upgrade section of the documentation

Documentation

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.

For the common use-case of automatically issuing TLS certificates to Ingress resources, aka a kube-lego replacement, see the cert-manager nginx ingress quick start guide.

See Getting started within the documentation for installation instructions.

Troubleshooting

If you encounter any issues whilst using cert-manager, we have a number of places you can use to try and get help.

The quickest way to ask a question is to first post on our Slack channel (#cert-manager) on the Kubernetes Slack. There are a lot of community members in this channel, and you can often get an answer to your question straight away!

You can also try searching for an existing issue. Properly searching for an existing issue will help reduce the number of duplicates, and help you find the answer you are looking for quicker.

Please also make sure to read through the relevant pages in the documentation before opening an issue. You can also search the documentation using the search box on the top left of the page.

If you believe you have encountered a bug, and cannot find an existing issue similar to your own, you may open a new issue. Please be sure to include as much information as possible about your environment.

Community

There is a Google Group used for project wide announcements and development coordination. Anybody can join the group by visiting here and clicking "Join Group". A Google account is required to join the group.

Once you have become a member, you should receive an invite to the weekly development meeting, hosted on Wednesdays at 4pm UTC on Zoom.us.

Anyone is welcome to join these calls, even if just to ask questions.

Meeting notes are recorded in Google docs.

Contributing

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.

Changelog

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