Hello everyone,

I absolutely understand the point regarding datacenters. I am using xcp-ng for years in smaller - non datacenter - environments and its great. Therefore I added the nut packages (8.2 and 8.3) and it works like a charm. It's installation is well explained in:

https://xcp-ng.org/forum/topic/4300/performing-automated-shutdown-during-a-power-failure-using-a-usb-ups-with-nut-xcp-ng-8-2/13?_=1742229073030

However, I agree with @Kajetan321 that it would be great if the nut package could be included in the standard "updated" packages repo since its added quite some benefits (imho) for "smaller" IT environments. However, I do not know how much effort it takes to maintain that.

@rzr Great. Thank you!

Good point.

Quick install procedure for anyone interested. I use a USB connected APC Smart-UPS 750 (SMT750RMI2U) on a completely patched test "XCP-ng 8.3" server. To install ci packages run:

yum install nut --enablerepo=xcp-ng-ci

Most important, check that your USV device is properly connected and found using

lsusb

it should show something like:

...
Bus 002 Device 002: ID 051d:0003 American Power Conversion UPS
...

Grab details then by:

lsusb -s 002:002 -v

which should give you something like

[12:53 xcp-test ~]# lsusb -s 002:002 -v

Bus 002 Device 002: ID 051d:0003 American Power Conversion UPS
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x051d American Power Conversion
  idProduct          0x0003 UPS
  bcdDevice            1.06
  iManufacturer           1 American Power Conversion
  iProduct                2 Smart-UPS 750 FW:UPS 15.1 / ID=18
  iSerial                 3 SERIALXXXXXXXX
  bNumConfigurations      1
...
  Remote Wakeup Enabled

Based upon this data you can add this information to your ups.conf

nano /etc/ups/ups.conf

[apc]
        driver = "usbhid-ups"
        port = "auto"
        vendorid = "051D"
        productid = "0003"
        product = "Smart-UPS 750 FW:UPS 15.1 / ID=18"
        serial = "SERIALXXXXXXXX"
        vendor = "American Power Conversion"
        bus = "002"

Now add users in nano /etc/ups/upsd.users. "upsmon" is for slave connected devices.

[admin]
      password = PWXXXXXX
      actions = SET FSD
      instcmds = ALL
      upsmon master

[upsmon]
      password = SLAVEPW
      upsmon slave

Now add/enable via nano /etc/ups/upsd.conf the required lines. If you want other servers to listen, you need to listen to a non-localhost IP of course.

LISTEN 127.0.0.1 3493

Now enable in nano /etc/ups/upsmon.conf the relevant line:

MONITOR apc@localhost 1 admin PWXXXXXX master

Now restart services:

upsdrvctl start
systemctl start nut-server.service
systemctl start nut-monitor.service

and you should be able to see the USV data by calling:

upsc apc@localhost

It should show:

battery.charge: 100
battery.charge.low: 10
battery.charge.warning: 50
battery.runtime: 3900
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 27.3
battery.voltage.nominal: 24.0
device.mfr: American Power Conversion
device.model: Smart-UPS 750
device.serial: SERIALXXXXX
device.type: ups
driver.name: usbhid-ups
driver.parameter.bus: 002
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 2
driver.parameter.port: auto
driver.parameter.product: Smart-UPS 750 FW:UPS 15.1 / ID=18
driver.parameter.productid: 0003
driver.parameter.serial: SERIALXXXXX
driver.parameter.synchronous: auto
driver.parameter.vendor: American Power Conversion
driver.parameter.vendorid: 051D
driver.version: 2.8.0
driver.version.data: APC HID 0.98
driver.version.internal: 0.47
driver.version.usb: libusb-0.1 (or compat)
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.firmware: UPS 15.1 / ID=18
ups.mfr: American Power Conversion
ups.mfr.date: 2015/08/14
ups.model: Smart-UPS 750
ups.productid: 0003
ups.serial: SERIALXXXXX
ups.status: OL
ups.timer.reboot: -1
ups.timer.shutdown: -1
ups.vendorid: 051d

HINT#1: I experienced that the bus id of the usb device sometimes changes after reboot. Watch out if you restart the server and adapt your ups.conf accordingly!!!

HINT#2: You need to open firewall port 3493 if you want to access it from a monitor!

@rzr: Sorry, first and foremost I totally forgot to say thank you very much. I really appreciate you work and effort for this "non-core" issue.

That said, I can say that it works on my test machines. I could successfully install and connected to a APC Smart-UPS 750 (SMT750RMI2UC) to my test server. Not a single problem whatsoever. I will now monitor it a bit and if I observe anything I will let you know.

Is there maybe anything particular you are interested in for me to test?

@rzr Hi. Thank you very much. I will be setting up a new server within the next 2 weeks and will definitely test it. Then I will give you feedback! Thank you again for picking it up!

@rzr
Hi, thank you for having a look.

Regarding point 1.)
As it was written by Olivier Lambert in post https://xcp-ng.org/forum/topic/10250/what-os-is-xcp-ng-8-3-based-on/8?_=1773671654080 I understand that your focus is on datacenter usage. Nevertheless I still think - and in other posts users mention it as well - there are quite a lot small non-datacenter - installations in place that use xcp-ng in small office structures using and needing an USV, since it simply essential. I love using XCP-NG and believe it would be a goodie that would make a lot small open source supporters like me very happy.

Regarding point 2.)
I am always careful when interfering with "mighty" tools like hypervisors. My experience is that my knowledge is unfortunately to small to see all caveats.

Hello everyone. I tripped over this issue. If someone got another approach I would be interested.

Thanks to @lsouai-vates I had a look at:

https://github.com/vatesfr/xen-orchestra/blob/ab56924b1d046ccf6c09dfe7a4ab47deb5d77f4a/packages/xo-acl-resolver/index.js

and

https://github.com/vatesfr/xen-orchestra/blob/ab56924b1d046ccf6c09dfe7a4ab47deb5d77f4a/packages/xo-server/src/xo-mixins/acls.mjs#L150-L168

To what I understand it is not possible as a Non-Admin user to get information like pools, ... By creating a new admin user limiting the resources via ACLS with viewer right worked around this. However, granting admin rights still looks sort of strange.

Just in case someone struggled as well this information might help.