add luks and virsh notes from truenas migration

active/software_virsh/virsh.md

@@ -16,10 +16,12 @@ Virtual Machine Management
     - [Set a Static IP](#set-a-static-ip)
   - [Creating VMs](#creating-vms)
     - [Create VM with No Graphics and use an Existing QCOW2 Disk](#create-vm-with-no-graphics-and-use-an-existing-qcow2-disk)
-      - [Create a Cloud Init Compatible VM](#create-a-cloud-init-compatible-vm)
+    - [Create a Cloud Init Compatible VM](#create-a-cloud-init-compatible-vm)
     - [Create VM with Graphics using an ISO Installation Disk](#create-vm-with-graphics-using-an-iso-installation-disk)
     - [Create VM using Host Device as Disk](#create-vm-using-host-device-as-disk)
+    - [Create a Home Assistant VM](#create-a-home-assistant-vm)
   - [Snapshots](#snapshots)
+  - [Creating and Attaching Disks](#creating-and-attaching-disks)
   - [Virt Builder](#virt-builder)
 
 ## Before you Begin
@@ -55,6 +57,12 @@ Virtual Machine Management
 export LIBVIRT_DEFAULT_URI='qemu+ssh://user@server/system'
 ```
 
+Or for Truenas
+
+```bash
+export LIBVIRT_DEFAULT_URI='qemu+ssh://root@truenas/system?socket=/run/truenas_libvirt/libvirt-sock'
+```
+
 ## Useful Virsh Commands
 
 ```bash
@@ -234,7 +242,7 @@ virt-install \
 --import --disk "path=${VM_DISK_PATH},bus=virtio"
 ```
 
-#### Create a Cloud Init Compatible VM
+### Create a Cloud Init Compatible VM
 
 <https://cloudinit.readthedocs.io/en/latest/reference/examples.html>
 
@@ -318,10 +326,93 @@ virt-install \
 --disk none
 ```
 
+### Create a Home Assistant VM
+
+```bash
+virt-install \
+--name haos \
+--description "Home Assistant OS" \
+--os-variant=generic \
+--ram=4096 \
+--vcpus=2 \
+--disk /var/lib/libvirt/images/haos_ova-16.3.qcow2,bus=scsi \
+--controller type=scsi,model=virtio-scsi \
+--import \
+--graphics none \
+--boot uefi
+```
+
 ## Snapshots
 
 See [qemu qcow2 snapshots](/active/software_qemu/qemu.md#qcow2-snapshots)
 
+## Creating and Attaching Disks
+
+To create and attach one disk:
+
+```bash
+export VM_NAME="cloud-init-test-fedora"
+export VM_DISK_NAME="test1"
+qemu-img create -f qcow2 /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2 1G
+
+virsh attach-disk ${VM_NAME} \
+--source /var/lib/libvirt/images/${VM_DISK_NAME} \
+--target vdb \
+--persistent
+--live
+```
+
+To create and attach multiple disks (for raid testing)
+
+```bash
+export VM_NAME="cloud-init-test-fedora"
+# Max supported for this script is 25
+export VM_NUM_DISKS=8
+export VM_DISK_SIZE=4G
+
+##### Attach #####
+# Create the disks and target mounts from our array
+letters=($(echo {a..z}))
+for disk_num in $(seq 1 $VM_NUM_DISKS); do
+    VM_DISK_NAME="test-${disk_num}"
+    VM_DISK_TARGET=vd${letters[$disk_num]}
+
+    echo "Creating /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2"
+    sudo qemu-img create -f qcow2 /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2 ${VM_DISK_SIZE}
+
+    echo "Attaching vd${letters[$disk_num]} to ${VM_NAME}"
+    virsh attach-disk ${VM_NAME} \
+    --source /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2 \
+    --target vd${letters[$disk_num]} \
+    --persistent \
+    --subdriver qcow2 \
+    --live
+done;
+
+##### Cleanup #####
+# Detach the disks from our VMs
+letters=($(echo {a..z}))
+for disk_num in $(seq 1 $VM_NUM_DISKS); do
+    VM_DISK_NAME="test-${disk_num}"
+    VM_DISK_TARGET=vd${letters[$disk_num]}
+
+    echo "Detaching vd${letters[$disk_num]} from ${VM_NAME}"
+    virsh detach-disk ${VM_NAME} \
+    --target vd${letters[$disk_num]} \
+    --persistent
+done;
+
+# Optionally delete images
+letters=($(echo {a..z}))
+for disk_num in $(seq 1 $VM_NUM_DISKS); do
+    VM_DISK_NAME="test-${disk_num}"
+    VM_DISK_TARGET=vd${letters[$disk_num]}
+
+    echo "Removing /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2"
+    sudo rm /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2
+done;
+```
+
 ## Virt Builder
 
 <https://docs.fedoraproject.org/en-US/fedora-server/virtualization/vm-install-diskimg-virtbuilder/#_minimal_effort_customization>