The CI Docker containers are no more able to do DNS lookups, and for example fails to git fetch from contint1001.wikimedia.org.
$ ssh integration-agent-docker-1001.integration.eqiad.wmflabs $ sudo docker run --rm -it --entrypoint=bash docker-registry.wikimedia.org/releng/ci-src-setup-simple:0.2.1 $ cat /etc/resolv.conf ## THIS FILE IS MANAGED BY PUPPET ## ## source: modules/base/resolv.conf.labs.erb ## from: base::resolving domain integration.eqiad.wmflabs search integration.eqiad.wmflabs eqiad.wmflabs nameserver 208.80.154.143 nameserver 208.80.154.24 options timeout:2 ndots:1 $ cd /src $ git init . $ git fetch git://contint1001.wikimedia.org/mediawiki/core fatal: Unable to look up contint1001.wikimedia.org (port 9418) (Temporary failure in name resolution)