vyos@vyos:/config/my-easy-rsa-config$ sudo ./easyrsa build-ca

Note: using Easy-RSA configuration from: ./vars

Using SSL: openssl OpenSSL 1.1.1n  15 Mar 2022

Enter New CA Key Passphrase:
Re-Enter New CA Key Passphrase:
Generating RSA private key, 2048 bit long modulus (2 primes)
.............................................+++++
........................+++++
e is 65537 (0x010001)
Can't load /config/my-easy-rsa-config/pki/.rnd into RNG
140039105021120:error:2406F079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:98:Filename=/config/my-easy-rsa-config/pki/.rnd
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----

$ sed -i 's/^RANDFILE/#RANDFILE/g' pki/openssl-easyrsa.cnf

ii  easy-rsa                             3.0.6-1                        all          Simple shell based CA utility