Entropy alarms false positives?

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1

Environment

Linux node1.feldcloud.net 5.4.17-2036.101.2.el7uek.x86_64 #2 SMP Wed Dec 2 17:56:16 PST 2020 x86_64 x86_64 x86_64 GNU/Linux
/etc/oracle-release:Oracle Linux Server release 7.9
/etc/os-release:NAME="Oracle Linux Server"
/etc/os-release:VERSION="7.9"
/etc/os-release:ID="ol"
/etc/os-release:ID_LIKE="fedora"
/etc/os-release:VARIANT="Server"
/etc/os-release:VARIANT_ID="server"
/etc/os-release:VERSION_ID="7.9"
/etc/os-release:PRETTY_NAME="Oracle Linux Server 7.9"
/etc/os-release:ANSI_COLOR="0;31"
/etc/os-release:CPE_NAME="cpe:/o:oracle:linux:7:9:server"
/etc/os-release:HOME_URL="https://linux.oracle.com/"
/etc/os-release:BUG_REPORT_URL="https://bugzilla.oracle.com/"
/etc/os-release:
/etc/os-release:ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7"
/etc/os-release:ORACLE_BUGZILLA_PRODUCT_VERSION=7.9
/etc/os-release:ORACLE_SUPPORT_PRODUCT="Oracle Linux"
/etc/os-release:ORACLE_SUPPORT_PRODUCT_VERSION=7.9
/etc/redhat-release:Red Hat Enterprise Linux Server release 7.9 (Maipo)
/etc/system-release:Oracle Linux Server release 7.9

Netdata version

netdata v1.28.0

Problem/Question

I am getting many times a day low entropy alarms, but looks like false positives.

I geting following warnings

Alarm information: lowest_entropy minimum entries in the random numbers pool in the last 10 minutes
--
Alarm value: 19 entries

but when I login to host immediatelly and run following command I get much higher value

# cat /proc/sys/kernel/random/entropy_avail 
3310

What I expected to happen

No false positives, or missing I something?

2

This is indeed strange @feldsam. I can’t reproduce it on my Ubuntu linux machine, so it might have to do with that particular distribution.

@Austin_Hemmelgarn perhaps can shed some light, seeing that he has participated in early discussions about our entropy collector.

By the way, welcome to our community!

3

This issue was reposted on our GitHub, so part of the discussion started there. Posting here the GitHub issue for posterity: