unbound:
  image: secns/unbound:1.5.8
  ports:
  - "53:53/udp"
  - "53:53"
  environment:
  - DO_IPV6=yes
  - DO_IPV4=yes
  - DO_UDP=yes
  - DO_TCP=yes
  - VERBOSITY=0
  - NUM_THREADS=1
  - SO_RCVBUFF=0
  - SO_SNDBUF=0
  - SO_REUSEPORT=no
  - EDNS_BUFFER_SIZE=4096
  - MSG_CACHE_SIZE=4m
  - RRSET_CACHE_SIZE=4m
  - CACHE_MIN_TTL=0
  - CACHE_MAX_TTL=86400
  - CACHE_MAX_NEGATIVE_TTL=3600
  - HIDE_IDENTITY=no
  - HIDE_VERSION=no
  - STATISTICS_INTERVAL=0
  - STATISTICS_CUMULATIVE=no
  - EXTENDED_STATISTICS=no
  restart: always