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Re: [MirageOS-devel] Just-In-Time Summoning of Unikernels

Hi Magnus,

We are interested to know how the VMs that Jitsu boots up get their IP addresses. Are they hardcoded in libvirt domain XML and/or Mirage config file? We are thinking of a dynamic approach where unikernels get their IP from a DHCP server and we wonder how to retrieve their IP.
Help will be appreciated, thanks

Kind regards

On 09/09/14 13:02, Magnus Skjegstad wrote:
I have written a small forwarding DNS server that starts virtual
machines on demand, which may be of interest to this list. The server is
called Jitsu - or Just-In-Time Summoning of Unikernels.

Before forwarding a DNS query, Jitsu checks if the requested domain
matches a known unikernel. If it does, the unikernel is started and its
IP is returned to the client. Jitsu continues to respond with the IP of
the unikernel for as long as it is running. If no requests have been
received for the domain within a timeout the unikernel is automatically

The code is available here:

Jitsu has been tested with Mirage VMs on a Cubietruck w/Xen and libvirt.
For installing libvirt with Xen-support I recommend following Nick's

The code is proof-of-concept at this point, so there is probably plenty
of room for optimizations. Contributions are welcome.


MirageOS-devel mailing list

Carlos Oviedo
PhD student
Network Systems Group
University of Nottingham

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