/etc/php5/mods-available/libvirt-php.ini is in php5-libvirt-php 0.4.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | extension=libvirt-php.so
[libvirt]
; Path to ISO images for VM installations
libvirt.iso_path=/var/lib/libvirt/images
; Path where disk images for new VMs should be created
libvirt.image_path=/var/lib/libvirt/images
; Limit maximum number of libvirt connections
libvirt.max_connections=5
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