2026-03-12 21:01:38

tiddlywiki/KVM notes.txt

@@ -0,0 +1,91 @@
+-- virsh usefull commands
+-------------------------
+# create new domain
+virt-install \
+  --graphics vnc,listen=0.0.0.0 \
+  --name=mandalore \
+  --vcpus=2 \
+  --memory=4096 \
+  --network bridge=br0 \
+  --network bridge=br0 \
+  --cdrom=/mnt/yavin4/kit/CentOS/CentOS-8.2.2004-x86_64-minimal.iso \
+  --disk /datastore/mandalore/hdd_01.img,size=6 \
+  --os-variant=centos8
+
+# get OS Variant
+osinfo-query os
+
+# destroy a domain
+virsh destroy mandalore
+
+# delete VM and underlying storage
+virsh undefine mandalore --remove-all-storage
+
+
+# adding disk to VM
+# on Dom0 create the disk (RAW format in exemple)
+qemu-img create -f raw /datastore/mandalore/app_01.img 8G
+# change the owner of the image ad permissions
+chown qemu:qemu /datastore/mandalore/app_01.img
+chmod 600 /datastore/mandalore/app_01.img
+# on DomU list block devices
+lsblk
+# or to have the sorted list of block devices
+fdisk -l | grep '^Disk /dev/vd[a-z]'
+# pick the next available device, ex: vdb
+# return to Dom0 and attach the disk
+virsh attach-disk mandalore /datastore/mandalore/app_01.img vdb --driver qemu --subdriver raw --targetbus virtio --persistent
+# to list the disk of a domain, execute from Dom0:
+virsh domblklist seedmachine --details
+
+# to detach a disk
+virsh detach-disk mandalore vdb --persistent
+
+
+# to list the network interfaces of a domain, execute from Dom0:
+virsh domiflist mandalore
+# add network interface
+virsh attach-interface --domain vortex-db01 --type bridge --source br0 --model virtio --persistent
+# remove network interface
+virsh detach-interface --domain ylesia-db01 --mac 52:54:00:8f:40:3c --type bridge
+
+
+# dump domain XML config file
+virsh dumpxml mandalore
+
+# define domain from XML config file
+virsh define --file /mnt/yavin4/tmp/seedmachine.xml
+
+
+# list all defined pool on Dom0
+virsh pool-list --all
+
+# deleting a pool
+virsh pool-destroy atrisia1
+virsh pool-undefine atrisia1
+
+# import (define) VM from XML file
+virsh define /mnt/yavin4/data/d.backup_vm/KVM_seed/Centos8_2020-10-25/seedmachine.xml
+
+# clone VM
+virt-clone \
+	--original mandalore \
+	--name ossus \
+	--file /datastore/ossus/hdd_01.img \
+	--file /datastore/ossus/app_01.img 
+    
+# KVM BUG: error: internal error: unknown feature amd-sev-es
+Workaround:
+mkdir -p /etc/qemu/firmware
+touch /etc/qemu/firmware/50-edk2-ovmf-cc.json
+
+# Install KVM on CentOS8
+https://www.cyberciti.biz/faq/how-to-install-kvm-on-centos-8-headless-server/
+
+# Online unicast MAC adress generator for network interface
+https://www.hellion.org.uk/cgi-bin/randmac.pl
+
+# Static MAC Generator for KVM
+# from http://blog.zencoffee.org/2016/06/static-mac-generator-kvm/
+MAC=$(date +%s | md5sum | head -c 6 | sed -e 's/\([0-9A-Fa-f]\{2\}\)/\1:/g' -e 's/\(.*\):$/\1/' | sed -e 's/^/52:54:00:/')
+echo $MAC