# Running applications on the host server **URL:** \ **Category:** SLES Virtualization\ **Created:** [July 12, 2012, 1:45pm UTC](https://forums.suse.com/t/running-applications-on-the-host-server/22841 "2012-07-12T13:45:06Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![John\_Gill](https://avatars.discourse-cdn.com/v4/letter/j/9dc877/32.png) [@John\_Gill](https://forums.suse.com/u/John_Gill)\ **Post date:** [July 12, 2012, 1:45pm UTC](https://forums.suse.com/t/running-applications-on-the-host-server/22841/1 "2012-07-12T13:45:06Z")
Hi, Running SLES11sp1 with Xen virtulization. I want to run DNS/DHCP on the host server and also run a mixture of Windows and OES VM’s using XEN. The VM’s are all low utilization. I guess this is possible but perhaps the best solution is not to run any software on the host, but rather create another VM for the DNS/DHCP. Any ideas or thoughts … Regards John ---
**Author:** ![system](https://us1.discourse-cdn.com/flex022/uploads/suse/original/2X/5/5012ba89e3ffb5220dac47d5ea0ba032e2fe1cb6.png) [@system](https://forums.suse.com/u/system)\ **Post date:** [July 12, 2012, 4:18pm UTC](https://forums.suse.com/t/running-applications-on-the-host-server/22841/2 "2012-07-12T16:18:55Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I am often tempted in this same way; the host has enough power, the application has low requirements anyway… what’s a person to do? My current (though subject to change pending new information, of course) opinion is that a VM host should do as little as possible outside of managing VMs. Even though DHCP and DNS are typically no-utilization services (for the majority of environments) they are also critical and that, to me, makes them ideal for virtualization. Something goes wrong? Move the VM elsewhere rather than setting up something new on another machine at the last minute. The VM(s) created to handle these services can be really, really small and with minimal resources since all it needs to do is boot and run a couple of services (sshd, bind, dhcpd) and you’re done. Migrating from one box to another with this small of a VM is then pretty trivial, even to an already-busy box since this won’t add much to it (though these services still need to have their place so don’t put them on a laggard). The container technology available in SLES 11 makes me excited for these very kinds of services. Having a “container” (vs. a VM) that is dedicated to something like DNS and DHCP (or one for each perhaps) that can be easily moved around without the 512 MB RAM and hardware emulation involved in creating a VM is really appealing. Good luck. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - [http://enigmail.mozdev.org/](http://enigmail.mozdev.org/) iQIcBAEBAgAGBQJP/s69AAoJEF+XTK08PnB5JL0QAMqIJphI7v0yieZWtODEwBsF AMPozZF+Rt8V83W05n7jdzI6zI1XX8QKxVRT75WaNNa3AXOtfPd/S5qKGSGeFqgi ydsZ9TyexATRaEMkk7scq/pQeKQ7q+fXVHhQs14jW5/Az+jUoVZlvPq39ebfzjXv lIdberdAXaJeOlLDvDT0PsnLLClD08df8Go8YV+OVx8SG8rEXIZjNfob3YkTg8j2 Tln4sBm/rT41VP68qgtGoclD+jhwHIU9Q0VDKdYA4y9/WNU7xUzFQ834zISKPVWD 2Pp59VQ/cFeZU8aPoynuB1yvwckIXh7IvOciugOGw/W2cqULqGpdEuBH5qtSTEux QQbFJxkuBmxuOG7XnkQgTyx3FLBOp6Ed1RkpsAy4FVdOp9g+ProZYx5RSZCCD/34 4PGcGMWfiKoaWyNvbsqdNnzwuR6t0kUDp84UU9ckafIlq4oFLjqul2UTrJ9zBpA/ HXbhFcynoIDeR6fzu8gZkpchhHmFn8SSManYjafuUPUNS9Tt+Je1l0jOND1zJjD5 B74GuXtoQgWRUKPf2tu/wClDioJS1V/uux7xLnPgoeCc3Wc3+K75SUaz/LtSXCUy Ouc8chT1Pcj6WEN7cO7LX67PNPC3JtYCM0kAjCuOy17vJBqZaziq0SzURh01TPRS mMGSwYEzIvj+CV+VVV6G =Miho -----END PGP SIGNATURE----- ---
**Author:** ![John\_Gill](https://avatars.discourse-cdn.com/v4/letter/j/9dc877/32.png) [@John\_Gill](https://forums.suse.com/u/John_Gill)\ **Post date:** [July 12, 2012, 5:15pm UTC](https://forums.suse.com/t/running-applications-on-the-host-server/22841/3 "2012-07-12T17:15:23Z")
Thanks AB, You confirmed my thoughts on Hosts and VM’s. John