Re: [Libguestfs] Question how to implement remote access
On Wed, Jan 06, 2016 at 01:09:27PM +0900, BYEONG-GI KIM wrote:
Hello.
I've been finding a good solution to monitor virtual machines' status such
as memory, disk, cpu, etc, and I found this as a tool for measuring
disk/image status.
I have a question while using the libguestfs-java library; I'd wanted to
implement a sample app which retrieve the disk information remotely. Is
there any way, i.e., specific API(s) to connect with a host where kvm/qemu
has been installed from a remote node, to access and get VMs' disk related
information remotely?
I read JavaDoc and libguestfs-java sample code from
http://libguestfs.org/guestfs-java.3.html, but I could not find such an
example.
It's a good question actually. Using a remote libvirt connection will
*not* work. Unless your disks are on shared storage, and are
accessible using the same paths at the monitoring machine, in which
case it might work.
[To see if this could work, try doing the following command from the
monitoring machine:
virsh -c qemu+ssh://root@hypervisor.example.com/system dumpxml name_of_a_guest
and if the command works and the paths in the returned libvirt XML are
also valid on the local monitoring machine, then libguestfs may work
remotely.]
I suggest that you use a Java remoting library such as RMI,
SpringSource remoting, JBoss remoting or others. It does mean that
you'll need to run a small service (the Java RMI server) on each node.
You can see a similar idea -- but implemented in Python -- here:
https://rwmj.wordpress.com/2013/05/07/using-libguestfs-remotely-with-pyth...
Another useful answer may be this one:
https://www.redhat.com/archives/libguestfs/2011-May/msg00093.html
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top