10 entropy was available. 临界阈值:50。

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问题
CDH 集群,出现 Entropy 不良问题,原因是系统熵值低于 CDH 检测的阀值引起的, 所以解决思路是需要调大系统熵值。
本文不阐述熵值问题,如需理解 entropy (熵值),需自行 google。

解决
查询系统熵值大小

cat /proc/sys/kernel/random/entropy_avail
安装 rng-tools 工具

yum install rng-tools
修改 /etc/sysconfig/rngd 文件,如没有该文件就创建

cat /etc/sysconfig/rngd
键入如下内容

OPTIONS="-r /dev/urandom"
启动服务,并重新查询熵池

service rngd start

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