linux 生成证书错误

在安装 openssl 证书时提示如下报错：

Can't load /root/.rnd into RNG
140496635077056:error:2406F079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:88:Filename=/root/.rnd
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解决办法
cd /root
openssl rand -writerand .rnd