libvirtd is slow when hostname is not resolvable on CloudBoot compute resources

Issue

The libvirtd service can respond with significant delays.

Environment

CloudBoot compute resources

Resolution

1. Speed up migration by adding the following entry to custom config (/etc/hosts) on all of your CloudBoot compute resources:

# echo -e $(ip -4 addr show dev mgt scope global | awk '$1 ~ /inet/

{print substr($2,1,length($2)-3)}

')'\t'$(hostname) >> /etc/hosts

2. Restart libvirtd service:

# systemctl restart libvirtd

Cause

Delays in libvirtd service response may appear when the hostname of a CloudBoot compute resource is not resolvable.