docker-stubby

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Stubby is a local DNS resolver based on getdns that supports DNS-over-TLS and forwards queries to configured upstream servers.

Environment variables

Basic options (all optional, defaults are used when unset):

• STUBBY__LOG_LEVEL (default: GETDNS_LOG_ERR)
• STUBBY__IDLE_TIMEOUT (default: 10000)
• STUBBY__EDNS_CLIENT_SUBNET_PRIVATE (default: 1)
• STUBBY__ROUND_ROBIN_UPSTREAMS (default: 0)
• STUBBY__TLS_AUTHENTICATION (default: GETDNS_AUTHENTICATION_REQUIRED)
• STUBBY__TLS_QUERY_PADDING_BLOCKSIZE (default: 256)
• STUBBY__TLS_MIN_VERSION (default: GETDNS_TLS1_2)
• STUBBY__TLS_MAX_VERSION (default: GETDNS_TLS1_3)
• STUBBY__DNSSEC (default: GETDNS_EXTENSION_TRUE)
• STUBBY__DNSSEC_RETURN_STATUS (default: GETDNS_EXTENSION_TRUE)

List options (indexes 0..99, all optional):

• STUBBY__DNS_TRANSPORT_LIST__<index> (default at 0: GETDNS_TRANSPORT_TLS)
• STUBBY__LISTEN_ADDRESSES__<index> (default at 0: 0.0.0.0@8053)
  • when running as non-root, use ports >=1024 (e.g. 8053)
• STUBBY__DNSSEC_TRUST_ANCHORS__<index> (no default, optional)
  • adds dnssec_trust_anchors list items, e.g. /etc/unbound/getdns-root.key
• STUBBY__UPSTREAM_RECURSIVE_SERVERS__<index>__ADDRESS_DATA
  • default for index 0: 194.242.2.2
  • required for index >0 if you want to add that server
• STUBBY__UPSTREAM_RECURSIVE_SERVERS__<index>__TLS_PORT
  • default for index 0: 853
  • optional for any index
• STUBBY__UPSTREAM_RECURSIVE_SERVERS__<index>__TLS_AUTH_NAME
  • default for index 0: dns.mullvad.net
  • optional for any index