rhtyd commented on issue #2518: CLOUDSTACK-10348: Don't specify cache mode for empty cdrom device URL: https://github.com/apache/cloudstack/pull/2518#issuecomment-377798740 @ustcweizhou Yes, with Ubuntu 17.10/18.04 several things have changes. Libvirt process is accessible by both `libvirtd` and `libvirt-bin`, netplan has been introduced. What broke for me were two main things, paths to the default/init conf file (I've fixed them) that fails cloudstack-setup-agent to work, and the other thing was a regression (likely) in qemu-kvm v2.10/v2.11 that fails starting of a VM for cdrom device when `cache=` is specified but file is empty (i.e. non attached cdrom device). On brief investigation I found that the issue is a regression in qemu-kvm but not sure if debian/ubuntu folks will fix it, centos/redhat folks have reported here: https://bugzilla.redhat.com/show_bug.cgi?id=1342999
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