안녕하세요 john 
discourse 명령을 실행하기 전에 ./launcher enter app을 실행하셨나요?
root@Canapin:~# cd /var/discourse/
root@Canapin:/var/discourse# ./launcher enter app
x86_64 arch detected.
root@Canapin-app:/var/www/discourse# discourse
Commands:
discourse backup # Backup a discourse forum
discourse disable_readonly # Disable the readonly mode
discourse disable_restore # Forbid restore operations
discourse enable_readonly # Enable the readonly mode
discourse enable_restore # Allow restore operations
discourse export # Backup a Discourse forum
discourse export_categories # Export categories, all its to...
discourse export_category # Export a category, all its to...
discourse export_topics # Export topics and all users w...
discourse help [COMMAND] # Describe available commands o...
discourse import # Restore a Discourse backup
discourse import_category # Import a category, its topics...
discourse import_topics # Import topics and their users...
discourse remap [--global,--regex] FROM TO # Remap a string sequence acros...
discourse request_refresh # Ask all clients to refresh th...
discourse restore # Restore a Discourse backup
discourse rollback # Rollback to the previous work...