There's https://github.com/opf/openproject/blob/dev/lib/open_project/configuration.rb that has a list of all default ENV / configuration flags that can be set with OPENPROJECT_<setting>, where setting is the key in that file with each underscore replaced by two (because a single underscore is mapped to an object since Redmine times - don't ask me why).

There's  https://github.com/opf/openproject/blob/dev/docs/configuration/configuration.md that tries to document some of these things but is clearly lacking some of the options.

Regarding your second question. As soon as you have /etc/openproject/installer.dat set with all the options needed openproject configure will not be raising any dialogs. However this will be brittle when an upgrade introduces a new variable there, it needs to be added beforehand. Maybe a packager option for non-interactive configuration would be useful here.

I created this as an idea task here: https://community.openproject.com/wp/31287

Best,

Oliver

I let this here if someone stumbles upon the case: VERSION 10 env vars + default values:

so to override if I understood correctly: openproject config:set 'OPENPROJECT_GRAVATAR__FALLBACK__IMAGE="gravatar.jpg"

OPENPROJECT_AFTER__FIRST__LOGIN__REDIRECT__URL=
OPENPROJECT_AFTER__LOGIN__DEFAULT__REDIRECT__URL=
OPENPROJECT_APIV3__ENABLE__BASIC__AUTH=true
OPENPROJECT_ATTACHMENTS__GRACE__PERIOD=180
OPENPROJECT_ATTACHMENTS__STORAGE='file'
OPENPROJECT_ATTACHMENTS__STORAGE__PATH=
OPENPROJECT_AUTH__SOURCE__SSO=
OPENPROJECT_AUTOLOGIN__COOKIE__NAME='autologin'
OPENPROJECT_AUTOLOGIN__COOKIE__PATH='/'
OPENPROJECT_AUTOLOGIN__COOKIE__SECURE=false
OPENPROJECT_BLACKLISTED__ROUTES=[]
OPENPROJECT_CACHE__EXPIRES__IN__SECONDS=
OPENPROJECT_CACHE__MEMCACHE__SERVER=
OPENPROJECT_CACHE__NAMESPACE=
OPENPROJECT_CROWDIN__IN__CONTEXT__TRANSLATIONS=true
OPENPROJECT_DATABASE__CIPHER__KEY=
OPENPROJECT_DEFAULT__COMMENT__SORT__ORDER='asc'
OPENPROJECT_DISABLED__MODULES=[]
OPENPROJECT_DISABLE__BROWSER__CACHE=true
OPENPROJECT_DISABLE__PASSWORD__CHOICE=false
OPENPROJECT_DISABLE__PASSWORD__LOGIN=false
OPENPROJECT_DROP__OLD__SESSIONS__ON__LOGIN=false
OPENPROJECT_DROP__OLD__SESSIONS__ON__LOGOUT=true
OPENPROJECT_EDITION='standard'
OPENPROJECT_EE__MANAGER__VISIBLE=true
OPENPROJECT_EMAIL__DELIVERY__CONFIGURATION='inapp'
OPENPROJECT_EMAIL__DELIVERY__METHOD=
OPENPROJECT_ENABLE__INTERNAL__ASSETS__SERVER=false
OPENPROJECT_FORCE__FORMATTING__HELP__LINK=
OPENPROJECT_FORCE__HELP__LINK=
OPENPROJECT_GRAVATAR__FALLBACK__IMAGE='404'
OPENPROJECT_HEALTH__CHECKS__AUTHENTICATION__PASSWORD=
OPENPROJECT_HEALTH__CHECKS__JOBS__NEVER__RAN__MINUTES__AGO=5
OPENPROJECT_HEALTH__CHECKS__JOBS__QUEUE__COUNT__THRESHOLD=50
OPENPROJECT_HIDDEN__MENU__ITEMS={}
OPENPROJECT_IMPRESSUM__LINK=
OPENPROJECT_INSTALLATION__TYPE="manual"
OPENPROJECT_INTERNAL__PASSWORD__CONFIRMATION=true
OPENPROJECT_LOG__LEVEL='info'
OPENPROJECT_MAIN__CONTENT__LANGUAGE='english'
OPENPROJECT_MIGRATION__CHECK__ON__EXCEPTIONS=true
OPENPROJECT_OMNIAUTH__DIRECT__LOGIN__PROVIDER=
OPENPROJECT_ONBOARDING__ENABLED=true
OPENPROJECT_ONBOARDING__VIDEO__URL='https://player.vimeo.com/video/163426858?autoplay=1'
OPENPROJECT_OVERRIDE__BCRYPT__COST__FACTOR=
OPENPROJECT_RAILS__ASSET__HOST=
OPENPROJECT_RAILS__CACHE__STORE=
OPENPROJECT_RAILS__FORCE__SSL=false
OPENPROJECT_RAILS__RELATIVE__URL__ROOT=''
OPENPROJECT_REGISTRATION__FOOTER={}
OPENPROJECT_SCM__GIT__COMMAND=
OPENPROJECT_SCM__LOCAL__CHECKOUT__PATH='repositories'
OPENPROJECT_SCM__SUBVERSION__COMMAND=
OPENPROJECT_SECURITY__BADGE__DISPLAYED=true
OPENPROJECT_SECURITY__BADGE__URL="https://releases.openproject.com/v1/check.svg"
OPENPROJECT_SENDMAIL__ARGUMENTS='-i'
OPENPROJECT_SENDMAIL__LOCATION='/usr/sbin/sendmail'
OPENPROJECT_SESSION__COOKIE__NAME='_open_project_session'
OPENPROJECT_SESSION__STORE=:cache_store
OPENPROJECT_SHOW__COMMUNITY__LINKS=true
OPENPROJECT_SHOW__PENDING__MIGRATIONS__WARNING=true
OPENPROJECT_SHOW__STORAGE__INFORMATION=true
OPENPROJECT_SHOW__WARNING__BARS=true
OPENPROJECT_SMTP__ADDRESS=
OPENPROJECT_SMTP__AUTHENTICATION=
OPENPROJECT_SMTP__DOMAIN=
OPENPROJECT_SMTP__ENABLE__STARTTLS__AUTO=
OPENPROJECT_SMTP__OPENSSL__VERIFY__MODE=
OPENPROJECT_SMTP__PASSWORD=
OPENPROJECT_SMTP__PORT=
OPENPROJECT_SMTP__USER__NAME=
OPENPROJECT_YOUTUBE__CHANNEL='https://www.youtube.com/c/OpenProjectCommunity'