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Configuration options

tip

Komga has sensible default values for all configuration keys. You only need to configure it if you want to change the default behaviour.

The application.yml file does not exist by default, you need to create one if you want to customize the configuration.

Komga relies heavily on Spring Boot's configuration, leveraging profiles and configuration properties.

The easiest way to configure is either via environment variables (a good fit for docker and docker-compose) or by using an application.yml file located in the configuration directory:

  • The Docker image will load any application.yml file located in the /config mounted folder.
  • The Jar will load any application.yml file located in the komga.config-dir directory (defaults to ~/.komga, more details).

Each configuration key can have a different format depending if it's from the environment variable, or from the application.yml file. In the following section I will provide both format in the form ENVIRONMENT_VARIABLE / application-property.

You can also specify configuration via the command line, when launching the jar. Use the application-property form, and prefix with --. For example:

java -jar komga.jar --server.servlet.context-path="/komga" --server.port=8443

Optional configuration​

You can use some optional configuration keys:

KOMGA_CONFIGDIR / komga.config-dir: <directory>​

The Komga configuration directory. Will be used to store the logs, database, and any other file Komga needs.

Defaults to:

  • %LOCALAPPDATA%/Komga on the Windows app. That folder is virtualized by Windows.
  • ~/Library/Application Support/Komga on the macOS app.
  • ~/.komga otherwise.

~ is your home directory on Unix, and your User profile on Windows.

When overriding this configuration, you need to use ${user.home} instead of ~ (this is a specific Spring Boot variable).

SERVER_PORT / server.port: <port>​

Port to listen to for the API and web interface.

Can also be configured from the Server Settings.

Defaults to 25600.

SERVER_SERVLET_CONTEXT_PATH / server.servlet.context-path: <baseUrl>​

Base URL, useful if you need to reverse proxy with a subfolder.

Can also be configured from the Server Settings.

Defaults to /.

SERVER_SERVLET_SESSION_TIMEOUT / server.servlet.session.timeout: <duration>​

The duration after which an inactive session will expire. You can specify the timeunit, for example 14d for 14 days, or 24h for 24 hours. If no unit is set, seconds will be used.

Defaults to 30 minutes.

KOMGA_DATABASE_FILE / komga.database.file: <file path>​

File path for the SQLite database.

If you want to change the directory, it is advised to change komga.config-dir instead.

Defaults to:

  • /config/database.sqlite for Docker.
  • \${komga.config-dir}/database.sqlite otherwise.

KOMGA_CORS_ALLOWED_ORIGINS / komga.cors.allowed-origins: <origins>​

A list of origins to allow for CORS.

Defaults to empty list.

KOMGA_OAUTH2_ACCOUNT_CREATION / komga.oauth2-account-creation: <true/false>​

A boolean indicating whether Komga should create new users when a login via OAuth2/OIDC succeeds, but there is no existing user with that email.

Such users will be created with a random password, which the user can subsequently change from the Account Settings page later on, for example to be able to connect using OPDS or Mihon.

warning

It is recommended to enable this only with OAuth2 providers you control

Defaults to false.

KOMGA_OIDC_EMAIL_VERIFICATION / komga.oidc-email-verification: <true/false>​

A boolean indicating whether Komga should check whether the email_verified claim is present and true in the OpenID Connect request.

warning

It is recommended to disable this only with OIDC providers that do not verify emails (like Azure AD)

Defaults to true.

LOGGING_FILE_NAME / logging.file.name: <logfile name>​

Name of the log file.

If you want to change the directory, it is advised to change komga.config-dir instead.

Defaults to:

  • ~/Library/Logs/Komga/komga.log for the macOS app.
  • /config/logs/komga.log for Docker.
  • \${komga.config-dir}/komga.log otherwise.

~ is your home directory on Unix, and your User profile on Windows.

When overriding this configuration, you need to use ${user.home} instead of ~ (this is a specific Spring Boot variable).

Sample Configuration File​

Here is a sample application.yml file in case you need to customize it. Keep only the lines you need.

# Only keep lines that are relevant to you!
# Lines starting with # are comments
# Make sure indentation is correct (2 spaces at every indentation level), yaml is very sensitive!
komga:
  database:
    file: ${user.home}/.komga/database.sqlite
  cors.allowed-origins:
    - http://localhost:8081
    - http://localhost:8082
  delete-empty-collections: true
  delete-empty-read-lists: true
server:
  port: 25600
  servlet:
    session.timeout: 7d # session timeout, here 7 days
    context-path: /komga

Database performance​

warning

Use at your own risk!

Some specific configuration keys are available to tweak the database performance.

komga:
  database:
    # sets the retry timeout when SQLITE_BUSY error happens
    busy-timeout: 30s
    
    # changes the journal mode
    # accepted values are: DELETE, TRUNCATE, PERSIST, MEMORY, WAL, OFF
    # most likely to be set to wal if needed, check https://sqlite.org/wal.html for more details
    journal-mode: wal
    
    # pool size will determine the number of connections in the pool
    # this takes precedence over max-pool-size if set
    # defaults to undefined
    pool-size: 1
    
    # max-pool-size will determine the maximum number of connections in the pool
    # when set, the number of connections is set to the number of available processors capped at max-pool-size
    # defaults to 1
    max-pool-size: 8
    
    # pragmas accepts a list of key/value pairs where:
    # - key is the pragma name (see https://www.sqlite.org/pragma.html)
    # - value is the pragma value
    pragmas:
      # here are some example pragmas
      page_size: 1024
      synchronous: OFF