[CentOS] Low random entropy

Sun May 28 03:32:22 UTC 2017
Robert Moskowitz <rgm at htt-consult.com>

On 05/26/2017 08:35 PM, Leon Fauster wrote:
>> Am 27.05.2017 um 01:09 schrieb Robert Moskowitz <rgm at htt-consult.com>:
>> I am use to low random entropy on my arm boards, not an intel.
>> On my Lenovo x120e,
>> cat /proc/sys/kernel/random/entropy_avail
>> reports 3190 bits of entropy.
>> On my armv7 with Centos7 I would get 130 unless I installed rng-tools and then I get ~1300.  SSH into one and it drops back to 30! for a few minutes.  Sigh.
>> Anyway on my new Zotac nano ad12 with an AMD E-1800 duo core, I am seeing 180.
>> I installed rng-tools and no change.  Does anyone here know how to improve the random entropy?
> http://issihosts.com/haveged/
> EPEL: yum install haveged


installed, enabled, and started.

Entropy jumped from ~130 bits to ~2000 bits


Note to anyone running a web server, or creating certs.  You need 
entropy.  Without it your keys are weak and attackable.  Probably even 
known already.