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--- unix:virtualization:techniques [2020/02/19 15:02] – created rodolico
+++ unix:virtualization:techniques [2020/02/19 15:15] – rodolico
@@ Line 25: / Line 25: @@
 ===== Sticky IP's (Reservations) with virt-manager =====
+virt-manager defaults to NAT on the networking. I find this useful on my laptop, where I don't always have a DHCP server available and the running virtuals should be private to my laptop. However, the dhcp server will occasionally give a different IP to the same machine.
+To get around this, find the MAC address of the virtual, then set the network to always give it the same IP address. By default, the dhcp server built into virt-manager sets up an entire /24 range except for the primary IP, so we'll need to adjust that range also.
+First, find the MAC address of the virtual you want to set up this way, and get the network list (usually "default")
+<code bash>
+# get network name
+virsh net-list
+# get MAC address of a virtual's network interface
+virsh  dumpxml  //vm_name// | grep 'mac address'
+</code>
+Now, edit the DHCP server
+<code bash>
+# change default to whatever you got in net-list, if it is different
+virsh net-edit default
+</code>
+Look through this list and find the XML block which defines the DHCP server. Adjust the range for automatic assignments to give you room to add  your reservations, then add a new line within the dhcp block to assign a sticky IP based on MAC address found above. Below, we have adjusted the //range start// address ufrom 192.168.122.2 to 192.168.122.100. .2-.99 are then available for sticky IP reservations. We then added three lines for vm1, vm2 and vm3, giving them an IP based on their mac addresses
+<code xml>
+<dhcp>
+  <range start='192.168.122.100' end='192.168.122.254'/>
+  <host mac='52:54:00:6c:3c:01' name='vm1' ip='192.168.122.11'/>
+  <host mac='52:54:00:6c:3c:02' name='vm2' ip='192.168.122.12'/>
+  <host mac='52:54:00:6c:3c:03' name='vm3' ip='192.168.122.12'/>
+</dhcp>
+</code>
+Save your work, then you need to do something to get it all to begin work. [[https://serverfault.com/questions/627238/kvm-libvirt-how-to-configure-static-guest-ip-addresses-on-the-virtualisation-ho#627245]], where I stole this idea, has a lot of things to do, but I just rebooted the damned thing and it began working just fine.
+===== Links =====
+  * [[https://www.utappia.org/2016/04/how-to-migrate-your-virtual-box.html]]
+  * https://serverfault.com/questions/627238/kvm-libvirt-how-to-configure-static-guest-ip-addresses-on-the-virtualisation-ho#627245