HackMD/docs/configuration-env-vars.md

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Configuration Using Environment variables

You can choose to configure CodiMD with either a config file or with environment variables. Environment variables are processed in lib/config/environment.js - so this is the first place to look if anything is missing not obvious from this document. The default values are defined in lib/config/default.js, in case you wonder if you even need to override it.

Environment variables take precedence over configurations from the config files. They generally start with CMD_ for our own options, but we also list node-specific options you can configure this way.

Node.JS

variable example value description
NODE_ENV production or development set current environment (will apply corresponding settings in the config.json)
DEBUG true or false set debug mode; show more logs

CodiMD basics

defaultNotePath can't be set from env-vars

variable example value description
CMD_ALLOW_PDF_EXPORT true or false Enable or disable PDF exports
CMD_CONFIG_FILE /path/to/config.json optional override for the path to CodiMD's config file
CMD_DB_URL mysql://localhost:3306/database set the database URL
CMD_LOGLEVEL info, debug ... Defines what kind of logs are provided to stdout.
CMD_FORBIDDEN_NOTE_IDS 'robots.txt' disallow creation of notes, even if CMD_ALLOW_FREEURL is true
CMD_IMAGE_UPLOAD_TYPE imgur, s3, minio, lutim or filesystem Where to upload images. For S3, see our Image Upload Guides for S3 or Minio, also there's a whole section on their respective env vars below.
CMD_SOURCE_URL https://github.com/codimd/server/tree/<current commit> Provides the link to the source code of CodiMD on the entry page (Please, make sure you change this when you run a modified version)
CMD_TOOBUSY_LAG 70 CPU time for one eventloop tick until node throttles connections. (milliseconds)

CodiMD Location

variable example value description
CMD_DOMAIN codimd.org domain name
CMD_URL_PATH codimd If CodiMD is run from a subdirectory like www.example.com/<urlpath>
CMD_HOST localhost interface/ip to listen on
CMD_PORT 80 port to listen on
CMD_PATH /var/run/codimd.sock path to UNIX domain socket to listen on (if specified, CMD_HOST and CMD_PORT are ignored)
CMD_PROTOCOL_USESSL true or false set to use SSL protocol for resources path (only applied when domain is set)
CMD_URL_ADDPORT true or false set to add port on callback URL (ports 80 or 443 won't be applied) (only applied when domain is set)
CMD_ALLOW_ORIGIN localhost, codimd.org domain name whitelist (use comma to separate)

CSP and HSTS

variable example value description
CMD_CSP_ENABLE true whether to enable Content Security Policy (directives cannot be configured with environment variables)
CMD_CSP_REPORTURI https://<someid>.report-uri.com/r/d/csp/enforce Allows to add a URL for CSP reports in case of violations
CMD_HSTS_ENABLE true set to enable HSTS if HTTPS is also enabled (default is true)
CMD_HSTS_INCLUDE_SUBDOMAINS true set to include subdomains in HSTS (default is true)
CMD_HSTS_MAX_AGE 31536000 max duration in seconds to tell clients to keep HSTS status (default is a year)
CMD_HSTS_PRELOAD true whether to allow preloading of the site's HSTS status (e.g. into browsers)

Privacy and External Requests

variable example value description
CMD_ALLOW_GRAVATAR true or false set to false to disable gravatar as profile picture source on your instance
CMD_USECDN true or false set to use CDN resources or not

Users and Privileges

variable example value description
CMD_ALLOW_ANONYMOUS true or false set to allow anonymous usage (default is true)
CMD_ALLOW_ANONYMOUS_EDITS true or false if allowAnonymous is true, allow users to select freely permission, allowing guests to edit existing notes (default is false)
CMD_ALLOW_FREEURL true or false set to allow new note creation by accessing a nonexistent note URL
CMD_DEFAULT_PERMISSION freely, editable, limited, locked or private set notes default permission (only applied on signed users)
CMD_SESSION_LIFE 1209600000 Session life time. (milliseconds)
CMD_SESSION_SECRET no example Secret used to sign the session cookie. If none is set, one will randomly generated on each startup, meaning all your users will be logged out.

Login methods

Email (local account)

variable example value description
CMD_EMAIL true or false set to allow email signin
CMD_ALLOW_EMAIL_REGISTER true or false set to allow email register (only applied when email is set, default is true. Note bin/manage_users might help you if registration is false.)

Dropbox Login

variable example value description
CMD_DROPBOX_CLIENTID no example Dropbox API client id
CMD_DROPBOX_CLIENTSECRET no example Dropbox API client secret

Facebook Login

variable example value description
CMD_FACEBOOK_CLIENTID no example Facebook API client id
CMD_FACEBOOK_CLIENTSECRET no example Facebook API client secret

GitHub Login

variable example value description
CMD_GITHUB_CLIENTID no example GitHub API client id
CMD_GITHUB_CLIENTSECRET no example GitHub API client secret

GitLab Login

variable example value description
CMD_GITLAB_SCOPE read_user or api GitLab API requested scope (default is api) (GitLab snippet import/export need api scope)
CMD_GITLAB_BASEURL no example GitLab authentication endpoint, set to use other endpoint than GitLab.com (optional)
CMD_GITLAB_CLIENTID no example GitLab API client id
CMD_GITLAB_CLIENTSECRET no example GitLab API client secret
CMD_GITLAB_VERSION no example GitLab API version (v3 or v4)

Google Login

variable example value description
CMD_GOOGLE_CLIENTID no example Google API client id
CMD_GOOGLE_CLIENTSECRET no example Google API client secret

LDAP Login

variable example value description
CMD_LDAP_URL ldap://example.com URL of LDAP server
CMD_LDAP_BINDDN no example bindDn for LDAP access
CMD_LDAP_BINDCREDENTIALS no example bindCredentials for LDAP access
CMD_LDAP_SEARCHBASE o=users,dc=example,dc=com LDAP directory to begin search from
CMD_LDAP_SEARCHFILTER (uid={{username}}) LDAP filter to search with
CMD_LDAP_SEARCHATTRIBUTES displayName, mail LDAP attributes to search with (use comma to separate)
CMD_LDAP_USERIDFIELD uidNumber or uid or sAMAccountName The LDAP field which is used uniquely identify a user on CodiMD
CMD_LDAP_USERNAMEFIELD Fallback to userid The LDAP field which is used as the username on CodiMD
CMD_LDAP_TLS_CA server-cert.pem, root.pem Root CA for LDAP TLS in PEM format (use comma to separate)
CMD_LDAP_PROVIDERNAME My institution Optional name to be displayed at login form indicating the LDAP provider

Mattermost Login

variable example value description
CMD_MATTERMOST_BASEURL no example Mattermost authentication endpoint for versions below 5.0. For Mattermost version 5.0 and above, see guide.
CMD_MATTERMOST_CLIENTID no example Mattermost API client id
CMD_MATTERMOST_CLIENTSECRET no example Mattermost API client secret

OAuth2 Login

variable example value description
CMD_OAUTH2_USER_PROFILE_URL https://example.com where retrieve information about a user after succesful login. Needs to output JSON. (no default value) Refer to the Mattermost or Nextcloud examples for more details on all of the CMD_OAUTH2... options.
CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR name where to find the username in the JSON from the user profile URL. (no default value)
CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR display-name where to find the display-name in the JSON from the user profile URL. (no default value)
CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR email where to find the email address in the JSON from the user profile URL. (no default value)
CMD_OAUTH2_TOKEN_URL https://example.com sometimes called token endpoint, please refer to the documentation of your OAuth2 provider (no default value)
CMD_OAUTH2_AUTHORIZATION_URL https://example.com authorization URL of your provider, please refer to the documentation of your OAuth2 provider (no default value)
CMD_OAUTH2_CLIENT_ID afae02fckafd... you will get this from your OAuth2 provider when you register CodiMD as OAuth2-client, (no default value)
CMD_OAUTH2_CLIENT_SECRET afae02fckafd... you will get this from your OAuth2 provider when you register CodiMD as OAuth2-client, (no default value)
CMD_OAUTH2_PROVIDERNAME My institution Optional name to be displayed at login form indicating the oAuth2 provider

SAML Login

variable example value description
CMD_SAML_IDPSSOURL https://idp.example.com/sso authentication endpoint of IdP. for details, see guide.
CMD_SAML_IDPCERT /path/to/cert.pem certificate file path of IdP in PEM format
CMD_SAML_ISSUER no example identity of the service provider (optional, default: serverurl)"
CMD_SAML_DISABLEREQUESTEDAUTHNCONTEXT true or false true to allow any authentication method, false restricts to password authentication (PasswordProtectedTransport) method (default: false)
CMD_SAML_IDENTIFIERFORMAT no example name identifier format (optional, default: urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress)
CMD_SAML_GROUPATTRIBUTE memberOf attribute name for group list (optional)
CMD_SAML_REQUIREDGROUPS codimd-users group names that allowed (use vertical bar to separate) (optional)
CMD_SAML_EXTERNALGROUPS Temporary-staff group names that not allowed (use vertical bar to separate) (optional)
CMD_SAML_ATTRIBUTE_ID sAMAccountName attribute map for id (optional, default: NameID of SAML response)
CMD_SAML_ATTRIBUTE_USERNAME mailNickname attribute map for username (optional, default: NameID of SAML response)
CMD_SAML_ATTRIBUTE_EMAIL mail attribute map for email (optional, default: NameID of SAML response if CMD_SAML_IDENTIFIERFORMAT is default)

Twitter Login

variable example value description
CMD_TWITTER_CONSUMERKEY no example Twitter API consumer key
CMD_TWITTER_CONSUMERSECRET no example Twitter API consumer secret

Upload Storage

These are only relevant when they are also configured in sync with their CMD_IMAGE_UPLOAD_TYPE. Also keep in mind, that filesystem is available, so you don't have to use either of these.

Amazon S3

variable example value description
CMD_S3_ACCESS_KEY_ID no example AWS access key id
CMD_S3_SECRET_ACCESS_KEY no example AWS secret key
CMD_S3_REGION ap-northeast-1 AWS S3 region
CMD_S3_BUCKET no example AWS S3 bucket name

Azure Blob Storage

variable example value description
CMD_AZURE_CONNECTION_STRING no example Azure Blob Storage connection string
CMD_AZURE_CONTAINER no example Azure Blob Storage container name (automatically created if non existent)

imgur

variable example value description
CMD_IMGUR_CLIENTID no example Imgur API client id

Minio

variable example value description
CMD_MINIO_ACCESS_KEY no example Minio access key
CMD_MINIO_SECRET_KEY no example Minio secret key
CMD_MINIO_ENDPOINT minio.example.org Address of your Minio endpoint/instance
CMD_MINIO_PORT 9000 Port that is used for your Minio instance
CMD_MINIO_SECURE true If set to true HTTPS is used for Minio

Lutim

variable example value description
CMD_LUTIM_URL https://framapic.org/ When CMD_IMAGE_UPLOAD_TYPE is set to lutim, you can setup the lutim url

Note: Due to the rename process we renamed all HMD_-prefix variables to be CMD_-prefixed. The old ones continue to work.

Note: relative paths are based on CodiMD's base directory