{{tag>linux kvm ipmi pikvm bmc}}
======PiKVM======
I purchased a PiKVM kit in 2021, and got it operational at that time.  I did not need to use it until recently, 2024-09. Basically a special 'hat' is mounted on a standard Raspberry Pi 4, the smallest memory unit type being sufficient (2 GB).  The kit was complete with all the required parts, such as the hat, Raspberry PI, a case, small OLED display and various cables.

After about 3 years of being shelved the OS would not update.  It was easier to simply re-image with the latest version of the software. I followed the [[https://docs.pikvm.org/flashing_os/#download-the-image|Flashing PiKVM OS image]] instructions, using the Linux CLI image flash option.

The PiKVM builtin display shows the KVM IP address, but I just used Linux commands to find from my LAN, e.g. ''sudo nmap -sn 192.168.1.1/24''.  Once I go satisfactorily operation I followed the instructions to change the passwords on the PiKVM and placed the related information into my password manager.

My router computers built in BMC/IMPI had failed and was difficult to use, particularly any time it was reset.  Hence I disabled the BMC VGA system and used the main CPU builtin GPU to the PiKVM with a USB C to USB A cable for the keyboard and mouse access.  I used a jumper on the motherboard to disable the BMC VGA to ensure it would not interfere with operation.  Basically I was no longer using the built in KVM.

====Update OS====
  *PiKVM OS (and the underlying Arch Linux ARM upstream) often receives software updates. After installation, it makes sense to update the OS.
  *The question of how often to update needs to primarily consider access to the OS and software latest features and latest security updates. Arch Linux is a rolling release frequently updated and sometimes has difficulties successfully updating from older versions.  In these cases it maybe easier to simply re-flash the latest pikvm os on to the memory card. 
  *Arguably if the pi-kvm is working it does not need to be updated
  *Security should not be an significant issue unless directly accessible from internet.  Although I can not think of any reason why direct internet access should ever be required.  It should always be possibly to access via a secured VPN if internet access is required.

To [[https://docs.pikvm.org/_update_os/|update pikvm os]]:
  -Login into the shell as root
  -''pikvm-update'' will run the update command that updates both the pikvm and underlying Arch OSs.
    -This script does the full update including placing the OS into rw mode before update and ro mode upon completion. 
    -The commands will inform if a reboot is necessary.  If reboot required, ''reboot'' command will reboot in root.
    -If message ''pikvm-update: command not found received'' then perform following
      -''rw'' command to place into read/write mode
      -''pacman -Syy'' command to update arch repository database
      -''pacman -S pikvm-os-updater'' to install the ''pikvm-update'' package
      -''pikvm-update'' should then run the update command
    -if the ''pikvm-update'' command still fails to function correctly it maybe necessary to re-flash the operating system on to the memory card, use the latest available version online.
 

=====PiKVM address and name=====
I assigned the PiKVM a specific IP address in the LAN Kea DHCP server and a local name in the LAN Bind9 DNS server and then performed internal secure routing on the LAN using Traefik.  The PiKVM software defaults to using a self signed certificate (Snake oil) for HTTPS.  I wanted to use simple http behind a local router that would terminate the host https on a reverse proxy to a http.  The instructions are to edit ''/etc/kvmd/override.yaml '' on the PiKVM adding the following:
<code>nginx:
    https:
        enabled: false</code>
This function as anticipated.

See [[https://www.reddit.com/r/pikvm/comments/1ahxvhh/kvmd_3301_generated_nginx_configs/|KVMD 3.301: Generated Nginx configs ]]
=====Links=====
  *[[https://pikvm.org/|PiKVM]]
    *[[https://docs.pikvm.org/v3/#installation-requirements|PiKVM V3 HAT]]
    *[[https://docs.pikvm.org/first_steps/#first-power-on|Getting access to PiKVM]]
    *[[https://docs.pikvm.org/flashing_os/|Flashing PiKVM OS image]]
    *[[https://docs.pikvm.org/_update_os/|update pikvm os]]


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