> For the complete documentation index, see [llms.txt](https://docs.pritunl.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pritunl.com/kb/cloud/components/authorities.md). # Authorities SSH keys or SSH certificates that are configured on instances Authorities contain public SSH keys or public SSH certificate authorities. Each authority can contain one public SSH key or certificate authority. The authorities are applied to instances at each boot only if the instance is stop and started again from the web console. Restarting the instance from the system will not update the cloud-init configuration. Authorities are selected by matching instances in the same organization that have matching roles. The SSH username will always be cloud for the Pritunl Cloud provided images. ### SSH Certificates SSH certificate authorities can be configured by adding the certificate and entering principals. The principals field allows controlling what certificate authority principals will have access to the server. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.pritunl.com/kb/cloud/components/authorities.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.