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34 lines
1 KiB
Markdown
34 lines
1 KiB
Markdown
## Power monitoring permissions
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In recent kernel versions, precise power monitoring is only accessible to root users to prevent using it as a side-channel attack.
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In order to get the power monitoring output you'll need to give the palantir user access to this data using the following steps.
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- Create a group using
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```bash
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sudo groupadd powermonitoring
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```
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- Create `/etc/udev/rules.d/99-powermonitoring.rules` with
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```udev
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SUBSYSTEM=="powercap", ACTION=="add", RUN+="/bin/chgrp -R powermonitoring /sys%p", RUN+="/bin/chmod -R g=u /sys%p"
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SUBSYSTEM=="powercap", ACTION=="change", ENV{TRIGGER}!="none", RUN+="/bin/chgrp -R powermonitoring /sys%p", RUN+="/bin/chmod -R g=u /sys%p"
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```
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- Apply the udev rules
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```
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sudo udevadm control --reload-rules && sudo udevadm trigger
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```
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- Add your user to the group
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```
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sudo usermod -a -G powermonitoring palantir
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```
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- Verify that you can read energy usage
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```
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sudo su - palantir -c 'cat /sys/class/powercap/intel-rapl:0:0/energy_uj'
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```
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