Docker Alpine Unbound resolver
Minimal unbound installation based on Alpine Linux at 6mb.
Example for a normal running config.
docker run --name unbound -d -p 53:53/udp -p 53:53 cdrocker/unbound
# dig pir.org +dnssec +multi @{{dockerhost}}
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Dockerfile
alpine 20240329
.github/workflows/docker.yml
docker/metadata-action v5docker/setup-qemu-action v3docker/setup-buildx-action v3docker/login-action v3docker/build-push-action v5
Just spun up a container tonight with cdrocker/unbound:latest and all lookups fail with SERVFAIL.
Switching the verbosity to level 3 shows, for example:
unbound_alpine | [1661072074] unbound[10:0] info: query response was ANSWER
unbound_alpine | [1661072074] unbound[10:0] info: finishing processing for . DNSKEY IN
unbound_alpine | [1661072074] unbound[10:0] debug: validator[module 0] operate: extstate:module_wait_module event:module_event_moddone
unbound_alpine | [1661072074] unbound[10:0] info: validator operate: query . DNSKEY IN
unbound_alpine | [1661072074] unbound[10:0] debug: Failed to match any usable anchor to a DNSKEY.
unbound_alpine | [1661072074] unbound[10:0] info: validate keys with anchor(DS): sec_status_bogus
unbound_alpine | [1661072074] unbound[10:0] info: failed to prime trust anchor -- DNSKEY rrset is not secure . DNSKEY IN
unbound_alpine | [1661072074] unbound[10:0] debug: validator[module 0] operate: extstate:module_wait_subquery event:module_event_pass
unbound_alpine | [1661072074] unbound[10:0] info: validator operate: query calendar.google.com. A IN
unbound_alpine | [1661072074] unbound[10:0] info: Could not establish a chain of trust to keys for . DNSKEY IN
unbound_alpine | [1661072074] unbound[10:0] debug: cache memory msg=68251 rrset=90935 infra=12299 val=68008
unbound_alpine | [1661072074] unbound[10:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_reply
unbound_alpine | [1661072074] unbound[10:0] info: iterator operate: query _ta-4a5c. NULL IN
unbound_alpine | [1661072074] unbound[10:0] info: response for _ta-4a5c. NULL IN
unbound_alpine | [1661072074] unbound[10:0] info: reply from <.> 192.36.148.17#53
unbound_alpine | [1661072074] unbound[10:0] info: query response was NXDOMAIN ANSWER
unbound_alpine | [1661072074] unbound[10:0] info: finishing processing for _ta-4a5c. NULL IN
unbound_alpine | [1661072074] unbound[10:0] debug: validator[module 0] operate: extstate:module_wait_module event:module_event_moddone
unbound_alpine | [1661072074] unbound[10:0] info: validator operate: query _ta-4a5c. NULL IN
unbound_alpine | [1661072074] unbound[10:0] debug: cache memory msg=68251 rrset=90935 infra=12299 val=68008
...but commenting out the trust-anchor: line from the unbound.conf file returns results again.
Obviously the trust-anchor and associated key is there for a reason, so I don't want to just leave it commented, but perhaps you have some hints on what I'm doing wrong?
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