4.2 KiB


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Sacrebleu is a DNS authoritative nameserver made in Go with library.

Records are stored in a SQL Database and cached using Redis.

This software requires a SQL server and a Redis server.

This software is currently in development and NOT ready for production.


Automated install

Each release contains a RPM and DEB package.

  • Download the latest package compatible with your system
  • Edit the config file in /etc/sacrebleu/config-dns.ini
  • Launch the database migration with sacrebleu-dns -sqlmigrate -config /etc/sacrebleu/config-dns.ini
  • Start the service systemctl start sacrebleu-dns

Manual Install

  • Download the latest release compatible with your system
  • Download and edit the configuration file
  • Launch the database migration with sacrebleu-dns -sqlmigrate -config [config path].ini
  • Download and edit the systemd service and put it in /lib/systemd/system/
  • Start the service systemctl start sacrebleu-dns


You can show theses informations using ./sacrebleu-dns -h.

   -config string
        the patch to the config file (default "extra/config.ini.example")
        initialize / migrate the database


Variables names are case sensitives.

Variable name Type Example Informations
app_mode string "production" Anything different than production will show debug messages
App Section
IP string ":" IP address on which the DNS server must listen. Blank to listen on all IPs
Port int 5353 Port on which the DNS server must listen
Logfile bool true Enable or disable file logs.
Logdir string /var/log Log file directory.
Database Section
Type string "postgresql" SQL Database type. "postgresql" or "mysql" (anything different than "postgresql" will rollback to "mysql")
Host string "" "/var/run/postgres" Can be either an IP or a path to a socket for Postgres
Username string "sacrebleu" SQL Database Username
Password string "superSecretPassword" SQL Database Password (optional)
Port string "5432" SQL Database port ("5432" for postgres or "3306" for MySQL by default)
DB string "sacrebleudatabase" SQL Database Name
Redis Section
IP string "" Redis Database IP
Password string "" Redis Database Password
Port int 6379 Redis Database port
DB int 0 Redis Database ID
TTL int 10 Redis Time To Live (in seconds)
DNS Section
XfrIPs []string *,, Allowed IPs for XFR transfer (* for any)

What is working

  • Read records (stricts & wildcard) from MySQL
  • Read and write records (stricts & wildcard) in Redis
  • Recursive wildcard for reverse DNS (IPv6 only)
  • Generate dynamic reverse DNS (IPv6 only)
  • Respond to all requested MySQL queries


  • Recursive wildcard for reverse DNS (IPv4 part)
  • Generate dynamic reverse DNS (IPv4 part)
  • XFR
  • Unit tests


FOSSA Status