[Show page]
[Old revisions]
[[unknown link type]]
[
]

Differences

This shows you the differences between two versions of the page.

--- linux:kvm [2015/12/07 15:14]
vondra
+++ linux:kvm [2019/01/11 13:14] (current)
admin
@@ Line 1: / Line 1: @@
 ====== Instalace KVM ======
 TODO: udelat tutorial :)
+<code bash>aptitude -y install qemu-kvm libvirt-bin virtinst bridge-utils </code>
 ====== Vytvoreni guesta ======
 ===== Debian 8 =====
-  - Instalace guestu:<code bash>virt-install -n vps1 --ram=2048 --vcpus=2 --location='http://ftp.cz.debian.org/debian/dists/jessie/main/installer-amd64/' --disk path=/dev/shared_vg/vps1  --network bridge=br0 --os-type linux --console pty,target_type=serial --graphics none --os-variant generic --extra-args 'console=ttyS0,115200n8 serial'</code>
+  - Install gues:<code bash>virt-install -n vps1 --ram=2048 --vcpus=2 --location='http://ftp.cz.debian.org/debian/dists/jessie/main/installer-amd64/' --disk path=/dev/shared_vg/vps1  --network bridge=br0 --os-type linux --console pty,target_type=serial --graphics none --os-variant generic --extra-args 'console=ttyS0,115200n8 serial'</code>
-  - v grubu pridat do radky linux <code>console=tty0 console=ttyS0,115200</code>
+  - put following line into grubu in line starting with linux <code>console=tty0 console=ttyS0,115200</code>
-  - do /etc/default/grub pridat do GRUB_CMDLINE_LINUX_DEFAULT "console=tty0 console=ttyS0,115200"<code>GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200"</code>
+  - put "console=tty0 console=ttyS0,115200" into /etc/default/grub in GRUB_CMDLINE_LINUX_DEFAULT <code>GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200"</code>
+  - update grub (this one i always forget and wondering why it doesn't work :))<code bash>update-grub</code>
 ====== Vzdaleny pristup ======
@@ Line 16: / Line 17: @@
 import libvirt
 conn = libvirt.open("qemu+ssh://root@10.0.0.120")
+# vypis bezicich vps (interni ID)
+conn.listDomainsID()
+# nalezeni vps podle ID (pouze bezici)
+vps = conn.lookupByID(1)
+# nalezeni vps podle jmena (bere i masiny, ktere jsou nebezici, ale nadefinovane)
 vps1 = conn.lookupByName("vps1")
+# spusteni
 vps1.start()
+# pause
 vps1.suspend()
+# unpause
 vps1.resume()
+# shut down
 vps1.shutdown()
-vps1.resume()
+# force shutdown
+vps1.destroy()
+# close connection
 conn.close()
-<code>
+</code>
-====== Level 1 Headline ======
+====== HOT migration ======
+  * NOTE: we cannot use kvm migration, since we use mirrored clustered LVM (mirrored volume could not be activated on more than one node in time)
+  * use following script instead:<code bash>
+#!/bin/bash
+if [ $# != 2 ]; then
+        echo "Usage: move_vps.sh domain destination"
+        exit 1
+fi
+MACHINE=$1
+DESTINATION=$2
+XML_NAME=/tmp/$MACHINE
+virsh dumpxml $MACHINE > $XML_NAME
+scp ${XML_NAME} root@${DESTINATION}:${XML_NAME}
+rm $XML_NAME
+IMG_NAME=/tmp/${MACHINE}.img
+virsh save $MACHINE $IMG_NAME
+scp $IMG_NAME root@${DESTINATION}:${IMG_NAME}
+rm $IMG_NAME
+lvchange -an /dev/shared_vg/$MACHINE
+ssh root@$DESTINATION "lvchange -ay /dev/shared_vg/$MACHINE"
+ssh root@$DESTINATION "virsh define ${XML_NAME}"
+ssh root@$DESTINATION "virsh restore $IMG_NAME"
+ssh root@$DESTINATION "rm $IMG_NAME"</code>
+====== Correct shutdown ======
+// Keywords: Libvirt Can't shutdown or reboot virtual guest.\
+I can't reboot or shutdown the guest vm from the host mac//
+<code bash>
+modprobe virtio_console
+apt install qemu-guest-agent
+service qemu-ga restart
+apt install acpid
+</code>
+Test if the agent is running
+<code bash>
+    virsh qemu-agent-command jakub-sevcik '{"execute":"guest-info"}'
+</code>

linux/kvm.1449497652.txt.gz · Last modified: 2015/12/07 15:14 by vondra