Python sensors not visible

Help
1

For some reason the “new” Python based sensors are not working for me at all. I’m probably missing something silly but I can’t figure it out.

I have tried:

  • a “blank” config for python.d/sensors.conf
  • a config with the specific chips enabled
  • enabling pretty much all settings such as update_every: 1 and such

I’m not using a custom dashboard, everything is pretty much stock and I have even tried completely wiping my netdata install.

What works:
sensors command properly shows the sensors as expected:

# sensors
iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +37.0°C

it8628-isa-0a60
Adapter: ISA adapter
in0:           1.98 V  (min =  +0.00 V, max =  +3.06 V)
in1:           3.06 V  (min =  +0.00 V, max =  +3.06 V)  ALARM
in2:           1.02 V  (min =  +0.00 V, max =  +3.06 V)
+5V:           1.01 V  (min =  +0.00 V, max =  +6.12 V)
in4:           1.97 V  (min =  +0.00 V, max =  +3.06 V)
in5:           1.30 V  (min =  +0.00 V, max =  +3.06 V)
in6:           1.57 V  (min =  +0.00 V, max =  +3.06 V)
3VSB:          3.67 V  (min =  +0.00 V, max =  +6.12 V)
Vbat:          3.41 V
fan1:         875 RPM  (min =   10 RPM)
fan2:        1030 RPM  (min =   10 RPM)
fan3:         772 RPM  (min =   10 RPM)
fan4:           0 RPM  (min =    0 RPM)
fan5:          -1 RPM  (min =    0 RPM)
temp1:        +46.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +50.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp3:        +40.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp4:       -110.0°C
temp5:        +60.0°C
temp6:         +0.0°C
intrusion0:  ALARM

nouveau-pci-0b00
Adapter: PCI adapter
fan1:           0 RPM
temp1:        +44.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +16.8°C  (crit = +20.8°C)

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +52.2°C
Tdie:         +52.2°C
Tccd1:        +36.5°C
Tccd2:        +37.0°C

it8628-isa-0a40
Adapter: ISA adapter
CPU Vcore:       1.43 V  (min =  +0.00 V, max =  +3.06 V)
+3.3V:           2.06 V  (min =  +0.00 V, max =  +3.06 V)
+12V:            2.05 V  (min =  +0.00 V, max =  +3.06 V)
+5V:             2.00 V  (min =  +0.00 V, max =  +3.06 V)
CPU Vcore SOC:   1.01 V  (min =  +0.00 V, max =  +3.06 V)
CPU Vddp:      912.00 mV (min =  +0.00 V, max =  +3.06 V)
DRAM A/B:        1.38 V  (min =  +0.00 V, max =  +3.06 V)
3VSB:            3.34 V  (min =  +0.00 V, max =  +6.12 V)
Battery:         3.19 V
CPU_FAN:       4753 RPM  (min =   10 RPM)
SYS_FAN1:       922 RPM  (min =   10 RPM)
SYS_FAN2:       906 RPM  (min =   10 RPM)
SYS_FAN3:      1220 RPM  (min =   10 RPM)
CPU_OPT:          0 RPM  (min =    0 RPM)
System 1:       +36.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
Chipset:        +33.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
CPU Socket:     +52.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = disabled
PCIEX16:        +46.0°C
VRM MOS:        +42.0°C
VSOC MOS:       +49.0°C
intrusion0:    ALARM

nvme-pci-0400
Adapter: PCI adapter
Composite:    +45.9°C  (low  = -273.1°C, high = +84.8°C)
                       (crit = +84.8°C)
Sensor 1:     +45.9°C  (low  = -273.1°C, high = +65261.8°C)
Sensor 2:     +46.9°C  (low  = -273.1°C, high = +65261.8°C)

Debugging the plugin also shows output:

# /usr/libexec/netdata/plugins.d/python.d.plugin sensors debug trace
2021-09-14 23:58:15: python.d INFO: plugin[main] : using python v3
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : looking for '/etc/netdata/python.d.conf'
2021-09-14 23:58:15: python.d INFO: plugin[main] : '/etc/netdata/python.d.conf' was not found
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : looking for '/usr/lib/netdata/conf.d/python.d.conf'
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : '/usr/lib/netdata/conf.d/python.d.conf' is loaded
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : looking for 'pythond-jobs-statuses.json' in /var/lib/netdata
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : loading '/var/lib/netdata/pythond-jobs-statuses.json'
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : '/var/lib/netdata/pythond-jobs-statuses.json' is loaded
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : [sensors] looking for 'sensors.conf' in ['/etc/netdata/python.d', '/usr/lib/netdata/conf.d/python.d']
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : [sensors] loading '/etc/netdata/python.d/sensors.conf'
2021-09-14 23:58:15: python.d DEBUG: plugin[main] : [sensors] '/etc/netdata/python.d/sensors.conf' is loaded
2021-09-14 23:58:15: python.d INFO: plugin[main] : [sensors] built 1 job(s) configs
2021-09-14 23:58:17: python.d INFO: plugin[main] : sensors[sensors] : check success
CHART netdata.runtime_sensors '' 'Execution time for sensors' 'ms' 'python.d' netdata.pythond_runtime line 145000 10 '' 'python.d.plugin' 'sensors'
DIMENSION run_time 'run time' absolute 1 1

2021-09-14 23:58:17: python.d DEBUG: sensors[sensors] : started, update frequency: 10
CHART sensors.iwlwifi_1-virtual-0_temperature '' 'iwlwifi_1-virtual-0 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60000 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'iwlwifi_1-virtual-0_temp1' 'temp1' absolute 1 1000 ' '

BEGIN sensors.iwlwifi_1-virtual-0_temperature 0
SET 'iwlwifi_1-virtual-0_temp1' = 35000
END

CHART sensors.it8628-isa-0a60_temperature '' 'it8628-isa-0a60 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60001 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a60_temp1' 'temp1' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_temp2' 'temp2' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_temp3' 'temp3' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_temp4' 'temp4' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_temp5' 'temp5' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_temp6' 'temp6' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a60_temperature 0
SET 'it8628-isa-0a60_temp1' = 46000
SET 'it8628-isa-0a60_temp2' = 51000
SET 'it8628-isa-0a60_temp3' = 40000
SET 'it8628-isa-0a60_temp4' = -110000
SET 'it8628-isa-0a60_temp5' = 63000
SET 'it8628-isa-0a60_temp6' = -1000
END

CHART sensors.nouveau-pci-0b00_temperature '' 'nouveau-pci-0b00 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60002 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'nouveau-pci-0b00_temp1' 'temp1' absolute 1 1000 ' '

BEGIN sensors.nouveau-pci-0b00_temperature 0
SET 'nouveau-pci-0b00_temp1' = 44000
END

CHART sensors.acpitz-acpi-0_temperature '' 'acpitz-acpi-0 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60003 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'acpitz-acpi-0_temp1' 'temp1' absolute 1 1000 ' '

BEGIN sensors.acpitz-acpi-0_temperature 0
SET 'acpitz-acpi-0_temp1' = 16800
END

CHART sensors.k10temp-pci-00c3_temperature '' 'k10temp-pci-00c3 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60004 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'k10temp-pci-00c3_temp1' 'Tctl' absolute 1 1000 ' '
DIMENSION 'k10temp-pci-00c3_temp2' 'Tdie' absolute 1 1000 ' '
DIMENSION 'k10temp-pci-00c3_temp3' 'Tccd1' absolute 1 1000 ' '
DIMENSION 'k10temp-pci-00c3_temp4' 'Tccd2' absolute 1 1000 ' '

BEGIN sensors.k10temp-pci-00c3_temperature 0
SET 'k10temp-pci-00c3_temp1' = 54375
SET 'k10temp-pci-00c3_temp2' = 54375
SET 'k10temp-pci-00c3_temp3' = 36250
SET 'k10temp-pci-00c3_temp4' = 37000
END

CHART sensors.it8628-isa-0a40_temperature '' 'it8628-isa-0a40 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60005 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a40_temp1' 'System 1' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_temp2' 'Chipset' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_temp3' 'CPU Socket' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_temp4' 'PCIEX16' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_temp5' 'VRM MOS' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_temp6' 'VSOC MOS' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a40_temperature 0
SET 'it8628-isa-0a40_temp1' = 36000
SET 'it8628-isa-0a40_temp2' = 33000
SET 'it8628-isa-0a40_temp3' = 54000
SET 'it8628-isa-0a40_temp4' = 46000
SET 'it8628-isa-0a40_temp5' = 42000
SET 'it8628-isa-0a40_temp6' = 49000
END

CHART sensors.nvme-pci-0400_temperature '' 'nvme-pci-0400 temperature' 'Celsius' 'temperature' 'sensors.temperature' line 60006 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'nvme-pci-0400_temp1' 'Composite' absolute 1 1000 ' '
DIMENSION 'nvme-pci-0400_temp2' 'Sensor 1' absolute 1 1000 ' '
DIMENSION 'nvme-pci-0400_temp3' 'Sensor 2' absolute 1 1000 ' '

BEGIN sensors.nvme-pci-0400_temperature 0
SET 'nvme-pci-0400_temp1' = 45850
SET 'nvme-pci-0400_temp2' = 45850
SET 'nvme-pci-0400_temp3' = 46850
END

CHART sensors.it8628-isa-0a60_fan '' 'it8628-isa-0a60 fans speed' 'Rotations/min' 'fans' 'sensors.fan' line 60007 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a60_fan1' 'fan1' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_fan2' 'fan2' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_fan3' 'fan3' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_fan4' 'fan4' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_fan5' 'fan5' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a60_fan 0
SET 'it8628-isa-0a60_fan1' = 873000
SET 'it8628-isa-0a60_fan2' = 1035000
SET 'it8628-isa-0a60_fan3' = 772000
SET 'it8628-isa-0a60_fan4' = 0
END

CHART sensors.nouveau-pci-0b00_fan '' 'nouveau-pci-0b00 fans speed' 'Rotations/min' 'fans' 'sensors.fan' line 60008 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'nouveau-pci-0b00_fan1' 'fan1' absolute 1 1000 ' '

BEGIN sensors.nouveau-pci-0b00_fan 0
SET 'nouveau-pci-0b00_fan1' = 0
END

CHART sensors.it8628-isa-0a40_fan '' 'it8628-isa-0a40 fans speed' 'Rotations/min' 'fans' 'sensors.fan' line 60009 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a40_fan1' 'CPU_FAN' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_fan2' 'SYS_FAN1' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_fan3' 'SYS_FAN2' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_fan4' 'SYS_FAN3' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_fan5' 'CPU_OPT' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a40_fan 0
SET 'it8628-isa-0a40_fan1' = 4753000
SET 'it8628-isa-0a40_fan2' = 922000
SET 'it8628-isa-0a40_fan3' = 902000
SET 'it8628-isa-0a40_fan4' = 1222000
SET 'it8628-isa-0a40_fan5' = 0
END

CHART sensors.it8628-isa-0a60_voltage '' 'it8628-isa-0a60 voltage' 'Volts' 'voltage' 'sensors.voltage' line 60010 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a60_in0' 'in0' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in1' 'in1' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in2' 'in2' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in3' '+5V' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in4' 'in4' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in5' 'in5' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in6' 'in6' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in7' '3VSB' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a60_in8' 'Vbat' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a60_voltage 0
SET 'it8628-isa-0a60_in0' = 1968
SET 'it8628-isa-0a60_in1' = 3060
SET 'it8628-isa-0a60_in2' = 1020
SET 'it8628-isa-0a60_in3' = 1416
SET 'it8628-isa-0a60_in4' = 1968
SET 'it8628-isa-0a60_in5' = 1296
SET 'it8628-isa-0a60_in6' = 1560
SET 'it8628-isa-0a60_in7' = 3672
SET 'it8628-isa-0a60_in8' = 3408
END

CHART sensors.it8628-isa-0a40_voltage '' 'it8628-isa-0a40 voltage' 'Volts' 'voltage' 'sensors.voltage' line 60011 10 '' 'python.d.plugin' 'sensors'
DIMENSION 'it8628-isa-0a40_in0' 'CPU Vcore' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in1' '+3.3V' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in2' '+12V' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in3' '+5V' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in4' 'CPU Vcore SOC' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in5' 'CPU Vddp' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in6' 'DRAM A/B' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in7' '3VSB' absolute 1 1000 ' '
DIMENSION 'it8628-isa-0a40_in8' 'Battery' absolute 1 1000 ' '

BEGIN sensors.it8628-isa-0a40_voltage 0
SET 'it8628-isa-0a40_in0' = 1248
SET 'it8628-isa-0a40_in1' = 2064
SET 'it8628-isa-0a40_in2' = 2052
SET 'it8628-isa-0a40_in3' = 2004
SET 'it8628-isa-0a40_in4' = 1008
SET 'it8628-isa-0a40_in5' = 912
SET 'it8628-isa-0a40_in6' = 1380
SET 'it8628-isa-0a40_in7' = 3336
SET 'it8628-isa-0a40_in8' = 3192
END

BEGIN netdata.runtime_sensors 0
SET run_time = 258
END

2021-09-14 23:58:25: python.d DEBUG: sensors[sensors] : update => [OK] (elapsed time: 258, failed retries in a row: 0)
^C2021-09-14 23:58:26: python.d INFO: plugin[main] : exiting from main...

Environment

Installed using the kickstart script and I have attempted a reinstall as well.
Version: v1.31.0-245-nightly
OS: Ubuntu 20.04 LTS

The netdata logs don’t contain any information about sensors. i.e. grep -i sensors /var/log/netdata/*.log returns nothing

Problem/Question

How can I make the sensors show in netdata?

What I expected to happen

Visible sensors in the dashboard
I have also just added a nut (for UPS) chart and I had no issues with that.

1 Like
2

Hi, @wolph. Thanks for the detailed post and using formatting :+1:

Let’s do the following:

  • do ps faxu | grep "[n]etdata" and show the output.
  • restart netdata.service; wait for 2-3 seconds; do grep sensors /var/log/netdata/error.log and show the output.
3

Hah, that’s a cool grep trick to prevent a “grep -v grep” :stuck_out_tongue:

# ps faxu | grep '[n]etdata'
netdata     8873  1.8  0.3 535460 251408 ?       Ssl  Sep15  26:41 /usr/sbin/netdata -P /var/run/netdata/netdata.pid -D
netdata     8893  0.0  0.0  31840  4576 ?        Sl   Sep15   0:00  \_ /usr/sbin/netdata --special-spawn-server
netdata     9174  2.8  0.0  68532 47064 ?        S    Sep15  40:51  \_ /usr/libexec/netdata/plugins.d/apps.plugin 1
netdata     9178  0.0  0.0 725688 15508 ?        Sl   Sep15   0:21  \_ /usr/libexec/netdata/plugins.d/go.d.plugin 1
root        9179  4.1  0.3 1024524 202024 ?      Sl   Sep15  58:57  \_ /usr/libexec/netdata/plugins.d/ebpf.plugin 1
netdata  3181869  0.0  0.0   4244  3192 ?        S    01:37   0:01  \_ bash /usr/libexec/netdata/plugins.d/tc-qos-helper.sh 1

The grep only shows the charts.d sensors, which is disabled as expected. But I don’t see the python.d sensors anywhere.

# grep sensors *
error.log:2021-09-16 02:15:06: charts.d: INFO: sensors: is disabled. Add a line with sensors=force in '/etc/netdata/charts.d.conf' to enable it (or remove the line that disables it).
4

Ok, for some reason python.d.plugin is not running :man_shrugging:

Let’s check grep python.d error.log

5

Here are the logs. I’m seeing some errors, but also success.

# grep 'python\.d' error.log
2021-09-17 01:05:25: netdata INFO  : PLUGINSD[python.d] : thread created with task id 3158879
2021-09-17 01:05:25: netdata INFO  : PLUGINSD[python.d] : set name of thread 3158879 to PLUGINSD[python
2021-09-17 01:05:25: netdata INFO  : PLUGINSD[python.d] : connected to '/usr/libexec/netdata/plugins.d/python.d.plugin' running on pid 3158884
/usr/libexec/netdata/plugins.d/python.d.plugin: line 18: /usr/bin/python: Operation not permitted
2021-09-17 01:05:25: netdata INFO  : WEB_SERVER[static1] : /usr/libexec/netdata/plugins.d/python.d.plugin: line 18: /usr/bin/python: Success
2021-09-17 01:05:25: netdata ERROR : PLUGINSD[python.d] : read failed: end of file (errno 9, Bad file descriptor)
2021-09-17 01:05:25: netdata INFO  : PLUGINSD[python.d] : PARSER ended
2021-09-17 01:05:25: netdata ERROR : PLUGINSD[python.d] : '/usr/libexec/netdata/plugins.d/python.d.plugin' (pid 3158884) disconnected after 0 successful data collections (ENDs).
2021-09-17 01:05:25: netdata ERROR : PLUGINSD[python.d] : child pid 3158884 exited with code 126.
2021-09-17 01:05:25: netdata ERROR : PLUGINSD[python.d] : '/usr/libexec/netdata/plugins.d/python.d.plugin' (pid 3158884) exited with error code 126 and haven't collected any data. Disabling it.
2021-09-17 01:05:25: netdata INFO  : PLUGINSD[python.d] : thread with task id 3158879 finished

It seems that this line is not working fully: exec "$pybinary" "$0" "${filtered[@]}"
But I don’t see why… when I manually execute the command it’s working fine. Also when logged in as the netdata user. The /usr/bin/python symlink points to the system python 3.8 install

6

Does it work when you run it manually as “netdata” user?

7

Yes, that works perfectly.

So I guess we can narrow it down to something with how systemd is running it and/or environmental settings. I’ve patched the python.d file to log the environmental settings, and these are the differences:

23d22
< PIDFILE=/run/netdata/netdata.pid
39,40d37
< INVOCATION_ID=0a503e558f6d47d8baf87195a2b9b5a6
< RUNTIME_DIRECTORY=/run/netdata
48a46
> TERM=screen-256color
51a50
> LIBVIRT_DEFAULT_URI=qemu:///system
63d61
< JOURNAL_STREAM=8:29849974
65c63,64
< PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
---
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
> MAIL=/var/mail/netdata

The right one is working, the left one isn’t. I don’t see anything that jumps out honestly…
I’ve also compared the limits between them and nothing useful in that area either:

7c7
< max locked memory       (kbytes, -l) 64
---
> max locked memory       (kbytes, -l) 65536

Is there anything else different from when systemd launches it?

8

I am not sure what the issue is :thinking:

@Austin_Hemmelgarn any ideas, see the log lines

9

I just had a different idea. Perhaps it’s related to the capabilities that systemd sets when starting the application.

Diffing capsh --print (with some post-processing) gives me:


0a1
> cap_chown
4c5,8
< cap_net_raw
---
> cap_fsetid
> cap_kill
> cap_setgid
> cap_setuid
6c10,18
< cap_sys_admin
---
> cap_linux_immutable
> cap_net_bind_service
> cap_net_broadcast
> cap_net_admin
> cap_net_raw
> cap_ipc_lock
> cap_ipc_owner
> cap_sys_module
> cap_sys_rawio
8a21,24
> cap_sys_pacct
> cap_sys_admin
> cap_sys_boot
> cap_sys_nice
9a26,38
> cap_sys_time
> cap_sys_tty_config
> cap_mknod
> cap_lease
> cap_audit_write
> cap_audit_control
> cap_setfcap
> cap_mac_override
> cap_mac_admin
> cap_syslog
> cap_wake_alarm
> cap_block_suspend
> cap_audit_read

So that’s a likely contender… but I don’t really have a clue which could be causing the difference.

Any clue which of these could be causing this? I’m not sure how the sensors module reads the data, I’ve already attempted to look at the capabilities for /usr/bin/sensors but that didn’t yield anything.

10

After a bit of a binary search (enabling half, half again and again) I found the culprit. Apparently we need the CAP_NET_BIND_SERVICE in /etc/systemd/system/multi-user.target.wants/netdata.service for sensors to work

Since that’s a capability that’s required to allow binding ports below 1024, I assume this is a bug somewhere. But I really have no clue why or how sensors would need to bind to a “low” port.

11

Wait, so the python.d.plugin starts working after you add CAP_NET_BIND_SERVICE to the Netdata’s systemd unit capability bound set?

reminder: we got
/usr/libexec/netdata/plugins.d/python.d.plugin: line 18: /usr/bin/python: Operation not permitted

12

Yes, exactly. After adding that capability to the systemd file it works flawlessly. If I remove it again it stops working.

13

Hi,

I ran into the exact same issue, also on Ubuntu 20.04 LTS (Same messages in error.log, manually debugging the plugin as netdata user works).

The issue was that I used setcap to give /usr/bin/python3.8 the capabilities cap_net_raw and cap_net_admin for running a script that accesses Bluetooth low energy devices. Removing these capabilities from the python executable fixed the issue. The netdata service could now execute python3 successfully.

Maybe this helps others who run into the same issue.

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