[SOLVED] Just FYI: current update seams to break NUT dependancies

[rzr]

@cobordism said:

yum update --disablerepo=* --enablerepo=xcp-ng-base,xcp-ng-updates

It's currently in testing and will move to updates if everything (not only nut) is ok:

yum install --disablerepo=* \
   --enablerepo=xcp-ng-base,xcp-ng-updates,xcp-ng-testing  nut

[FritzGerald]

Hi, I just wanted to comment that the provided packages work for all my server. Thank you!

[Kajetan321]

@FritzGerald Thank you for taking the time to write up the install procedure. I was able to follow it on my end and it seems to be working. What commands do you use to set the three services to start up automatically at boot up? Right now if I reboot and run upsc apc@localhost it throws an error until I manually do:

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

[FritzGerald]

@Kajetan321 Hi, sorry. I am away from office and I can't tell you that off the top of my head right now. I get back to you during the week.

[FritzGerald]

Hi @kajetan321, it has been a little while when setting this up. And I have to admit, that I am not sure weather the upcoming instructions are complete. So please take it as an indication:

#################################
Add Service for ups-driver
#################################

nano /etc/systemd/system/ups-driver.service

[Unit]
Description=NUT UPS Driver
After=network-online.target
Wants=network-online.target
Before=nut-server.service

[Service]
Type=oneshot
ExecStart=/usr/sbin/upsdrvctl start
ExecStop=/usr/sbin/upsdrvctl stop
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

###################################
Add Requirement for nut-server
#################################

mkdir -p /etc/systemd/system/nut-server.service.d
nano /etc/systemd/system/nut-server.service.d/ups-driver.conf

[Unit]
Requires=ups-driver.service
After=ups-driver.service

###################################
Add Requirement for nut monitor
#################################

mkdir -p /etc/systemd/system/nut-monitor.service.d
nano /etc/systemd/system/nut-monitor.service.d/nut-server.conf

[Unit]
Requires=nut-server.service
After=nut-server.service

###################################
Enable services
###################################

systemctl daemon-reload
systemctl enable ups-driver.service
systemctl enable nut-server.service
systemctl enable nut-monitor.service

systemctl start nut-monitor.service

###################################
Anaylze tools
###################################

systemctl list-dependencies nut-monitor.service
systemd-analyze critical-chain nut-monitor.service
systemctl show nut-monitor.service -p Requires -p Wants -p After
systemctl show nut-server.service -p Requires -p Wants -p After

Please let me know if it works, since I then would update my documentation above

[Kajetan321]

@FritzGerald Understood. Thanks for posting. I will get back to this as soon as I have some time.

[Kajetan321]

@FritzGerald I followed the procedure outline above. I did not see any errors when following the procedure however when I rebooted and then ran "upsc apc@localhost" I got "Error: Connection failure: Cannot assign requested address"

When I run "sudo systemctl status nut-server" I get " Active: inactive (dead)"

Running

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

fixes the issue. It looks like nut-server still does not start automatically at boot. How would I troubleshoot this further? I'm not a Linux system admin

Gemini suggested rebooting and running "journalctl -u nut-server.service -b 0" which resulted in "-- No entries --"

[FritzGerald]

@Kajetan321

I looked into my server and I think I forget some points.

First and foremost I have to say, modifying the systemd files can make you system unbootable! It should not happen, but there is chance since we are also modifying some "natively shipped files". So an update can break your working configuration again and that is not the fault of XCP-NG!!!

That said I assume that after a reboot (prior to any of any input of yours) if you enter:

systemctl status ups-driver.service nut-server.service nut-monitor.service

you will see that "ups-driver.service" is loaded and active, but the 2 other services are not. If thats the case I think I can help you since it is related to a dependency problem during boot up. Please do the following:

Remove "nut-driver.target" dependency from "nut-server.service" by calling

nano /lib/systemd/system/nut-server.service

and remove nut-driver.target from routine. I prefer to duplicate and comment the to be modified rows to keep the original code. It then should look like this. DO NOT COPY AND PASTE, read, compare and modify carefully!

[Unit]
Description=Network UPS Tools - power devices information server
#After=local-fs.target network.target nut-driver.target
After=local-fs.target network.target
# We don't Require drivers to be successfully started! This would be
# a change of behavior compared to init SysV, and could prevent from
# accessing successfully started, at least to audit a system.
#Wants=nut-driver.target
Wants=
# The `upsd` is a networked service (even if bound to a `localhost`)
# so it requires that the OS has some notion of networking already.
# Extending the unit does not require *this* file to be edited, you
# can instead drop in an additional piece of configuration, e.g. add
# a `/etc/systemd/system/nut-server.service.d/network.conf` with:
#   [Unit]
#   Requires=network-online.target
#   After=network-online.target
Requires=network.target
Before=nut-monitor.service
PartOf=nut.target

[Service]
EnvironmentFile=-/etc/ups/nut.conf
SyslogIdentifier=%N
# Note: foreground mode by default skips writing a PID file (and
# needs Type=simple); can use "-FF" here to create one anyway:
ExecStart=/usr/sbin/upsd -F
ExecReload=/usr/sbin/upsd -c reload -P $MAINPID

[Install]
WantedBy=nut.target

Afterwards enable nut.target:

systemctl enable nut.target

Then call:

systemctl daemon-reload
systemctl start nut.target
systemctl start nut-monitor.service

Now it should work even after reboot

[Kajetan321]

@FritzGerald Thank you for the follow up. It looks to me like none of the three services are running after a reboot.

Executing

systemctl status ups-driver.service nut-server.service nut-monitor.service

Results in:

● ups-driver.service - NUT UPS Driver
   Loaded: loaded (/etc/systemd/system/ups-driver.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

● nut-server.service - Network UPS Tools - power devices information server
   Loaded: loaded (/usr/lib/systemd/system/nut-server.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/nut-server.service.d
           └─ups-driver.conf
   Active: inactive (dead)

● nut-monitor.service - Network UPS Tools - power device monitor and shutdown controller
   Loaded: loaded (/usr/lib/systemd/system/nut-monitor.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/nut-monitor.service.d
           └─nut-server.conf
   Active: inactive (dead)

[FritzGerald]

@Kajetan321
I think you forgot

systemctl enable --now ups-driver.service