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coredns-zcash
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imp(docker): healtcheck and updated versions (#21) 

* imp(docker): healtcheck and updated versions

This improves the structure of the Dockerfile, uses the new DNS seeder version, which fixes some build issues and adds logging to coreDNS when there's an error

* Apply suggestions from code review

Co-authored-by: Conrado Gouvea <conradoplg@gmail.com>

---------

Co-authored-by: Conrado Gouvea <conradoplg@gmail.com>
This commit is contained in:
Gustavo Valverde 2024-03-15 09:30:22 +00:00 committed by GitHub
parent 78495f5f1a
commit bcd77dc546
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2 changed files with 36 additions and 26 deletions
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50
Dockerfile
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@ -1,19 +1,23 @@
FROM golang:1.17.3-alpine3.14 as builder ARG GO_VERSION=1.21.0
ARG ALPINE_VERSION=3.18
ARG COREDNS_VERSION=1.11.1
ARG DNSSEEDER_VERSION=v0.2.4-beta
FROM coredns/coredns:${COREDNS_VERSION} AS coredns
FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS builder
LABEL maintainer "Zcash Foundation <engineers@zfnd.org>" LABEL maintainer "Zcash Foundation <engineers@zfnd.org>"
ENV PATH /go/bin:/usr/local/go/bin:$PATH
ENV GOPATH /go
RUN apk --no-cache add \ RUN apk --no-cache add \
bash \
ca-certificates \ ca-certificates \
libcap \
git \ git \
make make
ENV COREDNS_VERSION v1.6.9 ARG COREDNS_VERSION
ENV DNSSEEDER_VERSION v0.2.3 ARG DNSSEEDER_VERSION
RUN git clone --depth 1 --branch ${COREDNS_VERSION} https://github.com/coredns/coredns /go/src/github.com/coredns/coredns RUN git clone --depth 1 --branch v${COREDNS_VERSION} https://github.com/coredns/coredns /go/src/github.com/coredns/coredns
WORKDIR /go/src/github.com/coredns/coredns WORKDIR /go/src/github.com/coredns/coredns
@ -23,28 +27,26 @@ RUN echo "replace github.com/btcsuite/btcd => github.com/ZcashFoundation/btcd v0
RUN go get github.com/zcashfoundation/dnsseeder/dnsseed@${DNSSEEDER_VERSION} RUN go get github.com/zcashfoundation/dnsseeder/dnsseed@${DNSSEEDER_VERSION}
RUN make all \ RUN make all && \
&& mv coredns /usr/bin/coredns setcap cap_net_bind_service=+ep ./coredns
FROM alpine:${ALPINE_VERSION} AS runner
FROM alpine:latest RUN apk --no-cache add bind-tools
RUN apk --no-cache add libcap USER nobody:nobody
COPY --from=builder /usr/bin/coredns /usr/bin/coredns COPY --from=builder /go/src/github.com/coredns/coredns/coredns /usr/bin/coredns
COPY --from=builder /etc/ssl/certs/ /etc/ssl/certs COPY --from=coredns /etc/ssl/certs /etc/ssl/certs
COPY coredns/Corefile /etc/dnsseeder/Corefile COPY coredns/Corefile /etc/coredns/Corefile
RUN setcap 'cap_net_bind_service=+ep' /usr/bin/coredns
# DNS will bind to 53 # DNS will bind to 53
EXPOSE 53 EXPOSE 53 53/udp
VOLUME /etc/dnsseeder # Check if the Coredns container is healthy
HEALTHCHECK --interval=5s --retries=10 CMD dig @0.0.0.0 mainnet.seeder.zfnd.org +dnssec >/dev/null
RUN adduser --disabled-password dnsseeder # Start coredns with custom configuration file
USER dnsseeder ENTRYPOINT ["coredns"]
CMD ["-conf", "/etc/coredns/Corefile"]
ENTRYPOINT [ "coredns" ]
CMD [ "-conf", "/etc/dnsseeder/Corefile"]

12
coredns/Corefile
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@ -1,17 +1,25 @@
mainnet.seeder.example.com { mainnet.seeder.zfnd.org {
dnsseed { dnsseed {
network mainnet network mainnet
bootstrap_peers mainnet.z.cash:8233 dnsseed.str4d.xyz:8233 mainnet.is.yolo.money:8233 mainnet.seeder.zfnd.org:8233 bootstrap_peers mainnet.z.cash:8233 dnsseed.str4d.xyz:8233 mainnet.is.yolo.money:8233 mainnet.seeder.zfnd.org:8233
crawl_interval 30m crawl_interval 30m
record_ttl 600 record_ttl 600
} }
# Add a log block to enable logging
log {
class denial error
}
} }
testnet.seeder.example.com { testnet.seeder.zfnd.org {
dnsseed { dnsseed {
network testnet network testnet
bootstrap_peers dnsseed.testnet.z.cash:18233 testnet.is.yolo.money:18233 testnet.seeder.zfnd.org:18233 bootstrap_peers dnsseed.testnet.z.cash:18233 testnet.is.yolo.money:18233 testnet.seeder.zfnd.org:18233
crawl_interval 15m crawl_interval 15m
record_ttl 300 record_ttl 300
} }
# Add a log block to enable logging
log {
class denial error
}
} }