docs: update nocloud.md Proxmox information

Proxmox _does_ support manually editing the configuration files, but a safer option is to use the CLI or API for the sake of option validation.

This PR updates the documentation that suggested reading and editing the VM configuration by hand, and replaces that with CLI commands to do the same. The `qm` command needs to be run from a root shell, but you need to be `root` to edit (or even read!) the configuration via something like SFTP, anyway.

I also updated the UUID to be a real UUID, and then tested these commands on my home Proxmox server.

Signed-off-by: bri <284789+b-@users.noreply.github.com>
Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

website/content/v1.6/talos-guides/install/cloud-platforms/nocloud.md

@@ -44,16 +44,26 @@ Set the source machine config through the serial number on Proxmox GUI.
 
 <img src="/images/no-cloud/proxmox-smbios.png" width="920px">
 
-The Proxmox stores the VM config at `/etc/pve/qemu-server/$ID.conf` (```$ID``` - VM ID number of virtual machine), you will see something like:
+You can read the VM config from a `root` shell with the command `qm config $ID` (```$ID``` - VM ID number of virtual machine), you will see something like:
 
-```conf
+```shellsession
+# qm config $ID
 ...
-smbios1: uuid=ceae4d10,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
+smbios1: uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
 ...
 ```
 
 Where serial holds the base64-encoded string version of `ds=nocloud-net;s=http://10.10.0.1/configs/`.
 
+The serial can also be set from a `root` shell on the Proxmox server:
+
+```shellsession
+# qm set $VM --smbios1 "uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=$(printf '%s' 'ds=nocloud-net;s=http://10.10.0.1/configs/' | base64),base64=1"
+update VM 105: -smbios1 uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
+```
+
+Keep in mind that if you set the serial from the command line, you must encode it as base64, and you must include the UUID and any other settings that are already set for the `smbios1` option or they will be removed.
+
 ### CDROM/USB
 
 Talos can also get machine config from local attached storage without any prior network connection being established.
@@ -113,13 +123,11 @@ Edit the cloud-init config information in Proxmox as follows, substitute your ow
 
 <img src="/images/no-cloud/proxmox-cloudinit.png" width="600px">
 
-and then update ```cicustom``` param at `/etc/pve/qemu-server/$ID.conf`.
+and then add a ```cicustom``` param to the virtual machine's configuration from a ```root``` shell:
 
-```config
-cicustom: user=local:snippets/controlplane-1.yml
-ipconfig0: ip=192.168.1.10/24,gw=192.168.10.254
-nameserver: 1.1.1.1
-searchdomain: local
+```shellsession
+# qm set 100 --cicustom user=local:snippets/controlplane-1.yml
+update VM 100: -cicustom user=local:snippets/controlplane-1.yml
 ```
 
 > Note: `snippets/controlplane-1.yml` is Talos machine config.

website/content/v1.7/talos-guides/install/cloud-platforms/nocloud.md

@@ -44,16 +44,26 @@ Set the source machine config through the serial number on Proxmox GUI.
 
 <img src="/images/no-cloud/proxmox-smbios.png" width="920px">
 
-The Proxmox stores the VM config at `/etc/pve/qemu-server/$ID.conf` (```$ID``` - VM ID number of virtual machine), you will see something like:
+You can read the VM config from a `root` shell with the command `qm config $ID` (```$ID``` - VM ID number of virtual machine), you will see something like:
 
-```conf
+```shellsession
+# qm config $ID
 ...
-smbios1: uuid=ceae4d10,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
+smbios1: uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
 ...
 ```
 
 Where serial holds the base64-encoded string version of `ds=nocloud-net;s=http://10.10.0.1/configs/`.
 
+The serial can also be set from a `root` shell on the Proxmox server:
+
+```shellsession
+# qm set $VM --smbios1 "uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=$(printf '%s' 'ds=nocloud-net;s=http://10.10.0.1/configs/' | base64),base64=1"
+update VM 105: -smbios1 uuid=5b0f7dcf-cfe3-4bf3-87a2-1cad29bd51f9,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
+```
+
+Keep in mind that if you set the serial from the command line, you must encode it as base64, and you must include the UUID and any other settings that are already set for the `smbios1` option or they will be removed.
+
 ### CDROM/USB
 
 Talos can also get machine config from local attached storage without any prior network connection being established.
@@ -113,13 +123,11 @@ Edit the cloud-init config information in Proxmox as follows, substitute your ow
 
 <img src="/images/no-cloud/proxmox-cloudinit.png" width="600px">
 
-and then update ```cicustom``` param at `/etc/pve/qemu-server/$ID.conf`.
+and then add a ```cicustom``` param to the virtual machine's configuration from a ```root``` shell:
 
-```config
-cicustom: user=local:snippets/controlplane-1.yml
-ipconfig0: ip=192.168.1.10/24,gw=192.168.10.254
-nameserver: 1.1.1.1
-searchdomain: local
+```shellsession
+# qm set 100 --cicustom user=local:snippets/controlplane-1.yml
+update VM 100: -cicustom user=local:snippets/controlplane-1.yml
 ```
 
 > Note: `snippets/controlplane-1.yml` is Talos machine config.