cannot build CentOS 8 behind proxy (pull access denied for arhashem/xr-centos)

[fcuiller]

Whenever trying to build the package behind a proxy, the appmgr_build fails at step 5:

cisco@telemetry-paris:~/xr-appmgr-build$ sudo ./appmgr_build -b ipmitool/build.yaml
Build version: 46055cab7d8ceff6fd1c3444195761574ac2e146
Starting to build package: ipmitool
---> ipmitool
Building docker image arhashem/xr-centos...
docker build docker -f docker/Centos.Dockerfile -t arhashem/xr-centos
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/
 
Sending build context to Docker daemon  6.656kB
Step 1/6 : FROM centos:8
---> 5d0da3dc9764
Step 2/6 : RUN cd /etc/yum.repos.d/
---> Using cache
---> 02793eb306d3
Step 3/6 : RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
---> Using cache
---> 139182e12559
Step 4/6 : RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
---> Using cache
---> a078099c8f19
Step 5/6 : RUN yum install -y pinentry rpm-sign rpm-build
---> Running in b14087148cef
^@CentOS Linux 8 - AppStream                      0.0  B/s |   0  B     02:00
Errors during downloading metadata for repository 'appstream':
  - Curl error (28): Timeout was reached for http://vault.centos.org/centos/8/AppStream/x86_64/os/repodata/repomd.xml [Connection timed out after 30001 milliseconds]
  - Curl error (28): Timeout was reached for http://vault.centos.org/centos/8/AppStream/x86_64/os/repodata/repomd.xml [Connection timed out after 30000 milliseconds]
Error: Failed to download metadata for repo 'appstream': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
The command '/bin/sh -c yum install -y pinentry rpm-sign rpm-build' returned a non-zero code: 1
make: *** [Makefile:7: arhashem/xr-centos] Error 1
Adding sources...
---> ipmitool
Adding configs...
Adding data...
Creating source archive...
^@Generating spec file: ipmitool-1.0.1.spec
Building RPM...
/usr/sbin/build_rpm.sh --spec-file /usr/src/rpm/SPECS/ipmitool-1.0.1.spec --source-dir /root/rpmbuild/SOURCES --rpm-dir /root/rpmbuild/RPMS --output-dir /root/RPMS --verbose
Unable to find image 'arhashem/xr-centos:latest' locally
docker: Error response from daemon: pull access denied for arhashem/xr-centos, repository does not exist or may require 'docker login': denied: requested access to the resource is denied.
See 'docker run --help'.

The reason is yum configuration must be provided the proxy details.
This can be achieved adding one extra line at the beginning of the Centos.Dockerfile:

cisco@telemetry-paris:~/xr-appmgr-build/docker$ cat Centos.Dockerfile
FROM centos:8
 
# Patching proxy
RUN echo "proxy=[http://proxy-wsa.esl.cisco.com:80](http://proxy-wsa.esl.cisco.com/)" >> /etc/yum.conf <<<<< add this line and replace with correct proxy information.
 
RUN cd /etc/yum.repos.d/
#Comment all the occurences of mirrorlist inside /etc/yum.repos.d/CentOS-* file
RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
#Replace all the occurences of mirror basurl with vault baseurl inside /etc/yum.repos.d/CentOS-* file
RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
RUN yum install -y pinentry rpm-sign rpm-build
 
COPY build_rpm.sh /usr/sbin/

Thanks @suhaib-ahmd