We are deploying the node_exporter on all of our servers to monitor resources. Some servers are spamming the logs with the following :
/sys/devices/system/cpu/cpu0/cpufreq: permission denied
could not get ARP entries: open /proc/net/arp: permission denied
On these servers I am also getting permission denied when I want to cat /proc/net/arp (as an example) as a regular user. When executing this as sudo, I am able to see the contents. This however is only the case on some of our servers, most of them are able to read the contents of proc and sys as a regular user. The read/write permission and owners of these files are exactly the same on both servers (working and not-working):
-r--r--r-- 1 root root 0 Oct 23 14:04 arp
/proc is mounted the same way on both servers as well (in /etc/fstab). I tried unmounting and remounting /proc on the failing servers but no luck. Anyone has an idea?