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--- docs:tips_n_tricks:xen.html [16.04.2022 18:41 CEST] – [Further reading] peter
+++ docs:tips_n_tricks:xen.html [13.08.2022 23:36 CEST] (current) – [Create new DomU] peter
@@ Line 21: / Line 21: @@
 ===== Create new DomU =====
 //Assuming, you have a bridge //xenbr0// up and running on your Dom0 with 10.1.0.1 beeing the outbound gateway and a disk partitioning scheme defined in// ''/etc/xen-tools/partitions.d/my-disk-set''
+  * create ''/etc/xen-tools/skel/root/.ssh/authorized_keys''
+  * run ''create_guest.sh //<name>//''
 <code bash create_guest.sh>
@@ Line 52: / Line 55: @@
 </code>
+<code authorized_keys /etc/xen-tools/skel/root/.ssh/authorized_keys>
+# replace 202204260000 by some day in the near future and add your own sshkey
+expiry-time="202204260000" ssh-rsa AAAAB3N...
+</code>
+===== Matching physical and virtual Xen block (and other) devices and eventually their ids =====
+  xenstore-ls -f -s /local/domain/0/backend/vbd | egrep '(domain|frontend|dev|params) = '
+__References:__
+  * [[https://serverfault.com/a/259112|ukautz' answer]] to question [[https://serverfault.com/questions/153196/xen-find-vbd-id-for-physical-disks|"Xen find VBD id for physical disks" on Server Fault]].
+  * https://xenbits.xen.org/docs/4.9-testing/man/xenstore-ls.1.html
 ===== Turn a domU into a new dom0 running with serial console =====
@@ Line 92: / Line 109: @@
 mkdir /GRUB0
 mount LABEL="$HOSTNAME:GRUB0" /GRUB0/
-grub-install --boot-directory /GRUB0 /dev/sdb
+grub-install --boot-directory /GRUB0 --recheck /dev/sdb
-grub-install --boot-directory /GRUB0 /dev/sda
+grub-install --boot-directory /GRUB0 --recheck /dev/sda
 </code>
 <code grub /GRUB0/grub/grub.cfg>
@@ Line 164: / Line 181: @@
 dhcp        = 'dhcp'
-vif         = [ 'bridge=xenbr0,vifname=eth0,mac=00:16:3e:XX:XX:XX' ]
+vif         = [ 'bridge=xenbr0,vifname=vif.oddom0.0,mac=00:16:3e:XX:XX:XX' ]
 </code>
 ==== Attach network to domU ====
@@ Line 189: / Line 206: @@
 to ''/etc/default/grub''
+<note warning>If you install GRUB from the new Dom0, make sure no outdated ''device.map'' is lying around. Best use the ''--recheck'' option to ''grub-install''</note>
 Manual steps:
 <code bash>
@@ Line 217: / Line 234: @@
   sysctl -w net.ipv4.conf.all.forwarding=1
+=== Make network card names persistent with your own (traditional) naming scheme ===
+//In domU connected to external interface//
+== The ifupdown way ==
+  * Give parameeter ''net.ifnames=0'' to the kernel at boot time
+  * Use ''mac/xx.xx.xx.xx.xx.xx.xx=eth0'' in ''/etc/network/interfaces''
+<code interfaces /etc/network/interfaces.d/ifrename>
+rename mac/00:16:3e:XX:XX:XX=vif0
+# rename mac/aa:bb:cc:??:??:??=eth0 # use this if you expect the network card to be replaced by another one of same type
+rename mac/aa:bb:cc:dd:ee:ff=eth0
+</code>
+== The systemd way ==
+<code properties /etc/systemd/network/10-persistent-eth0.link>
+# https://wiki.debian.org/NetworkInterfaceNames
+[Match]
+MACAddress=aa:bb:cc:dd:ee:ff
+[Link]
+Name=eth0
+</code>
+<code properties /etc/systemd/network/11-persistent-vif0.link>
+# https://wiki.debian.org/NetworkInterfaceNames
+[Match]
+MACAddress=00:16:3e:XX:XX:XX
+[Link]
+Name=vif0
+</code>
+=== Use persistent name in /etc/network/interfaces ===
+<code interfaces /etc/network/interfaces.d/vif0>
+auto vif0
+iface vif0 inet static
+ address 10.1.0.1
+ netmask 255.255.255.0
+</code>
 ==== Allow ssh root login ====
 <code text /etc/ssh/sshd_config>