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cloud-init creates /etc/NetworkManager/conf.d/99-cloud-init.conf, for NetworkManager to not update resolv.conf. However, subsequent update of NetworkManager seems to remove that file as there is no config(noreplace) directive for it. So after an update/upgrade of overcloud nodes, reboot would cleanup the dns entries. cloud-init do configuration only one time during first instance boot. So this would ensure resolv.conf is not touched during subsequent reboots. Change-Id: I989e3f1d14fd33e97933032111cf48166dc5f50cchanges/52/765252/3
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