Power DNS server

This image serves a PwerDNS server. It allows configuring:

• socket-dir
• allow-axfr-ips
• gsqlite3-database

Those parameters are set via environment variables:

• SOCKET_DIR
• AXFR_IPS
• SQLITE_DATABASE
• API_KEY: if not set, will be autogenerated randomly

For example, sqlite database shall be in a docker volume

• SOCKET_DIR: where unix socket will be saved.
• AXFR_IPS: By default uses 127.0.0.0/8, but can be changed if your pdns will be part of a master,slave dns cluster. However, PowerDNS uses [other mechanisms for replication]((https://doc.powerdns.com/authoritative/modes-of-operation.html)
• SQLITE_DATABASE: sqlite db path. By default /var/lib/powerdns/pdns.sqlite3. Be careful to save this file in a volume.
• API_KEY: which API KEY will be used for REST API. If not defined, a random one will be generated. For production installations setting this variable is mandatory.