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--- linux:kvm [2015/12/01 19:09]
vondra created
+++ 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 =====
-  - <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>
+  - put following line into grubu in line starting with linux <code>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 ======
+===== Pres certifikaty =====
+https://libvirt.org/remote.html
+  * note: nepovedlo se mi rozbehat
+===== Pres libvirt + ssh =====
+<code python>
+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()
+# force shutdown
+vps1.destroy()
+# close connection
+conn.close()
+</code>
+====== 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.1448993365.txt.gz · Last modified: 2015/12/01 19:09 by vondra