I use telegraf version 1.6.1 to gather vm processes metrics, when install by rpm, num_fds and io metrics are missing in the resulting output. i see telegraf github issues procstat permission denied · Issue #517 · influxdata/telegraf · GitHub, Missing fields in procstat output · Issue #2403 · influxdata/telegraf · GitHub , but that running telegraf as root solves the issue, another ansower to solve this issue?
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I tried setting CAP_SYS_ADMIN to telegraf using setcap but it didn’t work. The only time it worked was when I ran it as root.
Did anyone elver find a fix for this?
There is no fix (at least that I am aware of 
). In Linux, the nubmer of fds comes from the files found under /proc/$PID/fd. That directory is read only for root. Here is an example from my system:
dr-x------ 2 root root 7 May 4 14:08 fd
Meaning you must be root to access this data. Telegraf uses gopsutil to find the number of FDs based on the number of files listed in that directory.
CAP_SYS_ADMIN is used to do a number of “admin” operations and is commonly used for namespace operations. Should not apply here.
