init software_virsh

active/software_virsh/virsh.md

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+# Virsh
+
+Virtual Machine Management
+
+## Before you Begin
+
+1. Add yourself to the `qemu` and `libvirt` groups: `usermod -aG libvirt,qemu ducoterra`
+2. Change the images ownership to qemu: `chown -R qemu:qemu /var/lib/libvirt/images`
+3. Change the iso ownership to qemu: `chown -R qemu:qemu /var/lib/libvirt/iso`
+4. Allow group write access to images: `chmod 770 /var/lib/libvirt/images`
+5. Allow group write access to iso: `chmod 770 /var/lib/libvirt/iso`
+6. Tell virsh to connect to your root system rather than your user: `export LIBVIRT_DEFAULT_URI='qemu:///system'`
+
+## VM Details
+
+```bash
+# Show node info
+virsh nodeinfo
+
+# List OS variants
+osinfo-query os
+
+# List all current machines
+virsh list --all
+```
+
+## Creating VMs
+
+If you have [an osbuild
+image](/active/software_osbuild/image_builder.md#installing) you can run
+
+```bash
+sudo systemctl start osbuild-composer.socket
+composer-cli compose list
+composer-cli compose image --filename /var/lib/libvirt/images/fedora-42-test.qcow2 image-uuid
+```
+
+now to have a qcow2 available during install.
+
+```bash
+# `--location /path/to/image.iso` supplies a disk installer. (Remove `--import`)
+# `--import` skips the installation process.
+# `--graphics spice --video qxl --channel spicevmc` installs graphics
+# `--console pty,target.type=virtio` adds a console connection
+# For any command, use `virt-install --arg=?` to see all available options
+virt-install \
+--name fedora42-test \
+--description "Test VM with Fedora42" \
+--cpu host-model --vcpus sockets=1,cores=8,threads=2 \
+--ram=8192 \
+--os-variant=fedora41 \
+--import --disk path=/var/lib/libvirt/images/fedora-42-test.qcow2,bus=virtio \
+--network bridge:virbr0 \
+--graphics none \
+--console pty,target.type=virtio
+
+# Connect to console VM
+virsh console fedora42-test
+
+# Connect to graphical VM
+virt-viewer --wait fedora42-test
+
+# Get leased IP Addresses for the default network
+virsh net-dhcp-leases default
+
+# Reboot a VM
+virsh reboot <domain>
+
+# Shutdown a VM
+virsh shutdown <domain>
+
+# Force shutdown a VM
+virsh destroy <domain>
+
+# Remove a VM
+virsh undefine <domain>
+
+# Remove a VM including storage
+virsh undefine <domain> --remove-all-storage
+```