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64 lines
2.4 KiB
Markdown
64 lines
2.4 KiB
Markdown
---
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title: "Statelessness"
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description: "Statelessness is the ability for a system to operate without an in-memory state. A crash could result in loss of the in-memory state causing a bad user experience."
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lead: "Statelessness is the ability for a system to operate without an in-memory state. A crash could result in loss of the in-memory state causing a bad user experience."
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date: 2022-03-20T22:52:38+11:00
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draft: false
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images: []
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menu:
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overview:
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parent: "authorization"
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weight: 390
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toc: false
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aliases:
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- /t/statelessness
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- /docs/features/statelessness.html
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---
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__Authelia__ supports operating as a stateless application. This is incredibly important when running in highly
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available deployments like you may see in platforms like Kubernetes.
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## Stateful Considerations
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There are some components within __Authelia__ that may optionally be made stateful by using certain providers. Examples
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of this are as follows:
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### Session Provider
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__Severity:__ *BREAKING*.
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__Solution:__ Use a session provider other than memory (Redis).
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If you do not configure an external provider for the session configuration
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it stores the session in memory. This is unacceptable for the operation of
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__Authelia__ and is thus not supported for high availability.
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### Storage Provider
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__Severity:__ *BREAKING*.
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__Solution:__ Use a session provider other than SQLite3 (MySQL, MariaDB, PostgreSQL).
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Use of the local storage provider (SQLite3) is not supported in high availability setups
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due to a design limitation with how SQLite3 operates. Use any of the other storage providers.
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### Notification Provider
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__Severity:__ *HIGH*.
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__Solution:__ Use a notification provider other than file system (SMTP).
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Use of the file system notification provider prevents users from several key tasks which heavily impact usability of
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the system, and technically reduce security. Users will be unable to reset passwords or register new 2FA devices on
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their own. The file system provider is not supported for high availability.
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### Authentication Provider
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__Severity:__ *MEDIUM (limiting)*.
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__Solution:__ Use an authentication provider other than file (LDAP), or distribute the file and disable password reset.
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Use of the file authentication provider (YAML) is only partially supported with high availability setups. It's
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recommended if you don't use a stateless provider that you disable password reset and make sure the file is distributed
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to all instances. We do not support using the file type in these scenarios.
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