How to increase Linux kernel entropy

轉自： http://my.itwnik.com/how-to-increase-linux-kernel-entropy/

 

First of all you can check amount of entropy that you have

cat /proc/sys/kernel/random/entropy_avail.

To increase Linux kernel entropy you can run nice util called 「rng-tools」.

yum install rng-tools

After installation you can try to start and get such error:

/etc/init.d/rngd start
Starting rngd: can’t open entropy source(tpm or intel/amd rng)
Maybe RNG device modules are not loaded

[FAILED]

Please add extra options:
Edit /etc/sysconfig/rngd

EXTRAOPTIONS=」-r /dev/urandom」

Check your entropy again.

cat /proc/sys/kernel/random/entropy_avail