Difference between revisions of "Haveged"

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  # cat /proc/sys/kernel/random/entropy_avail
 
  # cat /proc/sys/kernel/random/entropy_avail
 
This command shows you how much entropy your server has collected.
 
This command shows you how much entropy your server has collected.
If it is rather low (<1000), you should probably install haveged. Otherwise cryptographic applications will block until there is enough entropy available, which eg. could result in slow wlan speed, if your server is a [[Software Access Point]].
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If it is rather low (<1000), you should probably install haveged. Otherwise cryptographic applications will block until there is enough entropy available, which eg. could result in slow wlan speed, if your server is a [[Software access point]].
  
 
You should use this command again to verify how much haveged boosted your entropy pool after the installation.
 
You should use this command again to verify how much haveged boosted your entropy pool after the installation.

Revision as of 12:12, 15 February 2014

The haveged project is an attempt to provide an easy-to-use, unpredictable random number generator based upon an adaptation of the HAVEGE algorithm. Haveged was created to remedy low-entropy conditions in the Linux random device that can occur under some workloads, especially on headless servers.[1]

List available entropy

If you're not sure, whether you need haveged, run:

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

This command shows you how much entropy your server has collected. If it is rather low (<1000), you should probably install haveged. Otherwise cryptographic applications will block until there is enough entropy available, which eg. could result in slow wlan speed, if your server is a Software access point.

You should use this command again to verify how much haveged boosted your entropy pool after the installation.

Installation

Install the haveged package from the official repositories.

Service

The package provides haveged.service, see systemd for details.