Comment 2 for bug 1798195

I see similar in [1]

================================================================================\\nUpgrade 34 Packages\\n\\nTotal download size: 2.2 M\\nDownloading packages:\\nDelta RPMs disabled because /usr/bin/applydeltarpm not installed.\\n\\u001b[91mhttp://mirror.regionone.rdo-cloud-tripleo.rdoproject.org:8080/rdo/centos7-rocky/ef/1b/ef1b65baed2beeb713a1c5406be70233015a612f_b681ccb6/openstack-tripleo-common-container-base-9.4.1-0.20181020102809.39ec3f6.el7.noarch.rpm: [Errno 14] curl#6 - \\"Could not resolve host: mirror.regionone.rdo-cloud-tripleo.rdoproject.org; Unknown error\\"\\n\\u001b[0m\\u001b[91mTrying other mirror.\\n\\u001b[0m\\u001b[91mhttp://mirror.regionone.rdo-cloud-tripleo.rdoproject.org:8080/rdo/centos7-rocky/ef/1b/ef1b65baed2beeb713a1c5406be70233015a612f_b681ccb6/puppet-aodh-13.3.1-0.20181016002558.013e80f.el7.noarch.rpm: [Errno 14] curl#6 - \\"Could not resolve host: mirror.regionone.rdo-cloud-tripleo.rdoproject.org; Unknown error\\"\\n\\u001b[0m\\u001b[91mTrying other mirror.\\n\\u001b[0m\\u001b[91m\\n\\nError downloading packages:\\n openstack-tripleo-common-container-base-9.4.1-0.20181020102809.39ec3f6.el7.noarch: [Errno 256] No more mirrors to try.\\n
...

, \n "Upgrade 34 Packages", \n "", \n "Total download size: 2.2 M", \n "Downloading packages:", \n "Delta RPMs disabled because /usr/bin/applydeltarpm not installed.", \n "\\u001b[91mhttp://mirror.regionone.rdo-cloud-tripleo.rdoproject.org:8080/rdo/centos7-rocky/ef/1b/ef1b65baed2beeb713a1c5406be70233015a612f_b681ccb6/openstack-tripleo-common-container-base-9.4.1-0.20181020102809.39ec3f6.el7.noarch.rpm: [Errno 14] curl#6 - \\"Could not resolve host: mirror.regionone.rdo-cloud-tripleo.rdoproject.org; Unknown error\\"", \n "\\u001b[0m\\u001b[91mTrying other mirror.", \n "\\u001b[0m\\u001b[91mhttp://mirror.regionone.rdo-cloud-tripleo.rdoproject.org:8080/rdo/centos7-rocky/ef/1b/ef1b65baed2beeb713a1c5406be70233015a612f_b681ccb6/puppet-aodh-13.3.1-0.20181016002558.013e80f.el7.noarch.rpm: [Errno 14] curl#6 - \\"Could not resolve host: mirror.regionone.rdo-cloud-tripleo.rdoproject.org; Unknown error\\"", \n "\\u001b[0m\\u001b[91mTrying other mirror.", \n "\\u001b[0m\\u001b[91m", \n "", \n "Error downloading packages:", \n " openstack-tripleo-common-container-base-9.4.1-0.20181020102809.39ec3f6.el7.noarch: [Errno 256] No more mirrors to try.", \n " puppet-aodh-13.3.1-0.20181016002558.013e80f.el7.noarch: [Errno 256] No more mirrors to try.", \n "", \n "\\u001b[0m"\n ]\n}\n\nPLAY RECAP *********************************************************************\nlocalhost : ok=16 changed=5 unreachable=0 failed=1 \n\nMonday 22 October 2018 07:26:13 +0000 (0:01:06.686) 0:01:12.043 ********

[1] https://logs.rdoproject.org/17/611617/2/openstack-check/tripleo-ci-centos-7-ovb-3ctlr_1comp-featureset035/a6e7bc9/logs/undercloud/home/zuul/install-undercloud.log.txt.gz