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Oracle Linux – How to Increase Entropy Value

APPLIES TO:

Linux OS – Version Oracle Linux 7.0 to Oracle Linux 9.0 [Release OL7 to OL9]

Linux x86_64 on Oracle Public Cloud

UEK5 / UEK6 / UEK7

 

GOAL:

Increase entropy value

Symptoms

[root@ ~]# cat /proc/sys/kernel/random/entropy_avail
256

 

 

SOLUTION:

Recent changes to the kernel's random number generator mean that the maximum value of /proc/sys/kernel/random/entropy_avail is 256.

In fact, its unlikely you'll ever see any value other than 256

 

You can prove you're not low on entropy and about to block by dd'ing a few hundred megabytes out of /dev/random and observing that it's ~400MB/s (depending on CPU speed)

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