Server

The server section configures and tunes the http server module Authelia uses.

Configuration

server:
  host: 0.0.0.0
  port: 9091
  path: ""
  read_buffer_size: 4096
  write_buffer_size: 4096
  enable_pprof: false
  enable_expvars: false
  disable_healthcheck: false
  tls:
    key: ""
    certificate: ""
    client_certificates: []
  headers:
    csp_template: ""

Options

host

Defines the address to listen on. See also port. Should typically be 0.0.0.0 or 127.0.0.1, the former for containerized environments and the later for daemonized environments like init.d and systemd.

Note: If utilising an IPv6 literal address it must be enclosed by square brackets and quoted:

host: "[fd00:1111:2222:3333::1]"

port

Defines the port to listen on. See also host.

path

Authelia by default is served from the root / location, either via its own domain or subdomain.

Modifying this setting will allow you to serve Authelia out from a specified base path. Please note that currently only a single level path is supported meaning slashes are not allowed, and only alphanumeric characters are supported.

Example: https://auth.example.com/, https://example.com/

server:
  path: ""

Example: https://auth.example.com/authelia/, https://example.com/authelia/

server:
  path: authelia

asset_path

Authelia by default serves all static assets from an embedded filesystem in the Go binary.

Modifying this setting will allow you to override and serve specific assets for Authelia from a specified path. All files that can be overridden are documented below and must be placed in the asset_path with a flat file structure.

Example:

/config/assets/
├── favicon.ico
├── logo.png
└── locales/<lang>[-[variant]]/<namespace>.json

read_buffer_size

Configures the maximum request size. The default of 4096 is generally sufficient for most use cases.

write_buffer_size

Configures the maximum response size. The default of 4096 is generally sufficient for most use cases.

enable_pprof

Enables the go pprof endpoints.

enable_expvars

Enables the go expvars endpoints.

disable_healthcheck

On startup Authelia checks for the existence of /app/healthcheck.sh and /app/.healthcheck.env and if both of these exist it writes the configuration vars for the healthcheck to the /app/.healthcheck.env file. In instances where this is not desirable it’s possible to disable these interactions entirely.

An example situation where this is the case is in Kubernetes when set security policies that prevent writing to the ephemeral storage of a container or just don’t want to enable the internal health check.

tls

Authelia typically listens for plain unencrypted connections. This is by design as most environments allow to security on lower areas of the OSI model. However it required, if you specify both the tls key and tls certificate options, Authelia will listen for TLS connections.

key

The path to the private key for TLS connections. Must be in DER base64/PEM format.

certificate

The path to the public certificate for TLS connections. Must be in DER base64/PEM format.

client_certificates

The list of file paths to certificates used for authenticating clients. Those certificates can be root or intermediate certificates. If no item is provided mutual TLS is disabled.

headers

csp_template

This customizes the value of the Content-Security-Policy header. It will replace all instances of ${NONCE} with the nonce value of the Authelia react bundle. This is an advanced option to customize and you should do sufficient research about how browsers utilize and understand this header before attempting to customize it.

For example, the default CSP template is default-src 'self'; object-src 'none'; style-src 'self' 'nonce-${NONCE}'.

Additional Notes

Buffer Sizes

The read and write buffer sizes generally should be the same. This is because when Authelia verifies if the user is authorized to visit a URL, it also sends back nearly the same size response as the request. However you’re able to tune these individually depending on your needs.

Asset Overrides

If replacing the Logo for your Authelia portal it is recommended to upload a transparent PNG of your desired logo. Authelia will automatically resize the logo to an appropriate size to present in the frontend.

locales

The locales folder holds folders of internationalization locales. This folder can be utilized to override these locales. They are the names of locales that are returned by the navigator.langauge ECMAScript command. These are generally those in the RFC5646 / BCP47 Format specifically the language codes from Crowdin.

Each directory has json files which you can explore the format of in the internal/server/locales directory on GitHub. The important part is the key names you wish to override. Each file represents a translation namespace. The list of current namespaces are below:

A full example for the en-US locale for the portal namespace is locales/en-US/portal.json.

Languages in browsers are supported in two forms. In their language only form such as en for English, and in their variant form such as en-AU for English (Australian). If a user has the browser language en-AU we automatically load the en and en-AU languages, where any keys in the en-AU language take precedence over the en language, and the translations for the en language only applying when a translation from en-AU is not available.

List of supported languages and variants:

Important Note Currently users can only override languages that already exist in this list either by overriding the language itself, or adding a variant form of that language. If you’d like support for another language feel free to make a PR. We also encourage people to make PR’s for variants where the difference in the variants is important.

Important Note Overriding these files will not guarantee any form of stability. Users who planning to utilize these overrides should either check for changes to the files in the en translation prior to upgrading or PR their translation to ensure it is maintained.