Oracle Linux – How to Increase Entropy Value
in Linux
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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