CODEWITHSUNDEEP
dockerfileredhatalpine-linux
M B
M B

Reputation: 323

wget: unable to resolve host address 'github.com'

I am building my dockerfile using Redhat UBI image, and when I build the image I get the wget: unable to resolve host address'github.com'.

I have tried adding a different URL that does not start with GitHub and that works. Not sure what the problem is.

Below are the errors logs i get when i build the docker file with : wget: unable to resolve host address 'github.com'

Step 11/25 : RUN set -ex;   apk update;   apk add -f acl dirmngr gpg lsof procps wget netcat gosu tini;   rm -rf /var/lib/apt/lists/*;   cd /usr/local/bin; wget -nv https://github.com/apangin/jattach/releases/download/v1.5/jattach; chmod 755 jattach;   echo >jattach.sha512 "d8eedbb3e192a8596c08efedff99b9acf1075331e1747107c07cdb1718db2abe259ef168109e46bd4cf80d47d43028ff469f95e6ddcbdda4d7ffa73a20e852f9  jattach";   sha512sum -c jattach.sha512; rm jattach.sha512
 ---> Running in 3ad58c40b25a
+ apk update
fetch https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
v20200917-1125-g7274a98dfc [https://dl-cdn.alpinelinux.org/alpine/edge/main]
v20200917-1124-g01e8cb93ff [https://dl-cdn.alpinelinux.org/alpine/edge/community]
OK: 13174 distinct packages available
+ apk add -f acl dirmngr gpg lsof procps wget netcat gosu tini
(1/12) Installing libacl (2.2.53-r0)
(2/12) Installing acl (2.2.53-r0)
(3/12) Installing lsof (4.93.2-r0)
(4/12) Installing libintl (0.20.2-r0)
(5/12) Installing ncurses-terminfo-base (6.2_p20200918-r1)
(6/12) Installing ncurses-libs (6.2_p20200918-r1)
(7/12) Installing libproc (3.3.16-r0)
(8/12) Installing procps (3.3.16-r0)
(9/12) Installing tini (0.19.0-r0)
(10/12) Installing libunistring (0.9.10-r0)
(11/12) Installing libidn2 (2.3.0-r0)
(12/12) Installing wget (1.20.3-r1)
Executing busybox-1.32.0-r3.trigger
OK: 9 MiB in 26 packages
+ rm -rf '/var/lib/apt/lists/*'
+ cd /usr/local/bin
+ wget -nv https://github.com/apangin/jattach/releases/download/v1.5/jattach
wget: unable to resolve host address 'github.com'
The command '/bin/sh -c set -ex;   apk update;   apk add -f acl dirmngr gpg lsof procps wget netcat gosu tini;   rm -rf /var/lib/apt/lists/*;   cd /usr/local/bin; wget -nv https://github.com/apangin/jattach/releases/download/v1.5/jattach; chmod 755 jattach;   echo >jattach.sha512 "d8eedbb3e192a8596c08efedff99b9acf1075331e1747107c07cdb1718db2abe259ef168109e46bd4cf80d47d43028ff469f95e6ddcbdda4d7ffa73a20e852f9  jattach";   sha512sum -c jattach.sha512; rm jattach.sha512' returned a non-zero code: 4

Here is my docker file that I have which I build to create the image

FROM alpine: edge as BUILD


LABEL repository="https://github.com/docker-solr/docker-solr"

ARG SOLR_VERSION="8.6.2"
ARG SOLR_SHA512="0a43401ecf7946b2724da2d43896cd505386a8f9b07ddc60256cb586873e7e58610d2c34b1cf797323bf06c7613b109527a15105dc2a11be6f866531a1f2cef6"
ARG SOLR_KEYS="E58A6F4D5B2B48AC66D5E53BD4F181881A42F9E6"
# If specified, this will override SOLR_DOWNLOAD_SERVER and all ASF mirrors. Typically used downstream for custom builds
ARG SOLR_DOWNLOAD_URL

# Override the solr download location with e.g.:
#   docker build -t mine --build-arg SOLR_DOWNLOAD_SERVER=http://www-eu.apache.org/dist/lucene/solr .
ARG SOLR_DOWNLOAD_SERVER


RUN set -ex; \
  apk add --update; \
  apk add -f install acl dirmngr gpg lsof procps wget netcat gosu tini; \
  rm -rf /var/lib/apt/lists/*; \
  cd /usr/local/bin; wget -nv https://github.com/apangin/jattach/releases/download/v1.5/jattach; chmod 755 jattach; \
  echo >jattach.sha512 "d8eedbb3e192a8596c08efedff99b9acf1075331e1747107c07cdb1718db2abe259ef168109e46bd4cf80d47d43028ff469f95e6ddcbdda4d7ffa73a20e852f9  jattach"; \
  sha512sum -c jattach.sha512; rm jattach.sha512

Upvotes: 4

Views: 22611

Answers (2)

user2745509
user2745509

Reputation: 461

Alpine images have a gotcha: they have both default wget (busybox built-in one) and wget package built with musl. Musl queries DNS'es in a different way:

"Traditional resolvers, including glibc’s, make use of multiple nameserver lines in resolv.conf by trying each one in sequence and falling to the next after one times out. musl’s resolver queries them all in parallel and accepts whichever response arrives first." https://wiki.musl-libc.org/functional-differences-from-glibc.html#Name-Resolver/DNS

Hence one DNS quick with a wrong answer could be ruining it all.

Upvotes: 0

Howard_Roark
Howard_Roark

Reputation: 4326

I would check whether you can resolve github.com on your host where you're doing this build, and I would cat /etc/resolv.conf to see the resolvers of your host. If github.com resolves on your host (which you can see via nslookup github.com), then I would try to use the resolvers explicitly by either configuring the Docker daemon to use it as seen here and here or I would try to do it at a per command level as suggested in an answer here, which is kind of creative.

RUN echo "nameserver XX.XX.XX.XX" > /etc/resolv.conf && \    
    command_depending_on_dns_resolution

Upvotes: 5

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