Linux command
haveged 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Start
sudo haveged
Example
sudo haveged -F
Example
sudo haveged -f [path/to/file]
Example
sudo haveged -r [runlevel]
Example
sudo haveged -b [buffersizeinKW]
Example
sudo haveged -d [cachesizeinKW]
Example
sudo haveged -n [byteamount]
说明
haveged is a random number generator daemon that feeds the Linux kernel's entropy pool (/dev/random). It uses the HAVEGE (HArdware Volatile Entropy Gathering and Expansion) algorithm, which harvests entropy from CPU timing variations. The daemon is particularly useful for: - Headless servers lacking traditional entropy sources (keyboard, mouse) - Virtual machines with limited hardware entropy - Systems requiring high-throughput random number generation - Preventing /dev/random blocking during cryptographic operations haveged monitors the kernel entropy pool and automatically feeds it when levels drop.
参数
- -F, --Foreground
- Run in foreground (don't daemonize)
- -f, --file _PATH_
- Write random data to file instead of /dev/random
- -r, --run _LEVEL_
- Set run level (0=run as daemon, 1=display results)
- -b, --buffer _SIZE_
- Collection buffer size in KiB words
- -d, --data _SIZE_
- Cache size in KiB words
- -n, --number _BYTES_
- Number of bytes to write to output
- -w, --write _BYTES_
- Write _BYTES_ to /dev/random at a time
- -v, --verbose _LEVEL_
- Verbosity level
FAQ
What is the haveged command used for?
haveged is a random number generator daemon that feeds the Linux kernel's entropy pool (/dev/random). It uses the HAVEGE (HArdware Volatile Entropy Gathering and Expansion) algorithm, which harvests entropy from CPU timing variations. The daemon is particularly useful for: - Headless servers lacking traditional entropy sources (keyboard, mouse) - Virtual machines with limited hardware entropy - Systems requiring high-throughput random number generation - Preventing /dev/random blocking during cryptographic operations haveged monitors the kernel entropy pool and automatically feeds it when levels drop.
How do I run a basic haveged example?
Run `sudo haveged` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -F, --Foreground do in haveged?
Run in foreground (don't daemonize)