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Asked: 2026-06-07T16:25:27+00:00

Can anybody point me to some good tutorial about openssl and how generate correct

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Can anybody point me to some good tutorial about
openssl and how generate correct sertificate for development
Application contain several subdomains so it shoul be wildcard subdomain certificate
as far as I know.
I find some good tutorial here http://www.akadia.com/services/ssh_test_certificate.html
But I want real world example for several subdomains.

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1 Answer

  1. Editorial Team

    If you want a simple wildcard – then follow that very example – but instead of entering {{{public.akadia.com}}} enter {{{*.akadia.com}}}.

    That should be it. Try. If it works (it usually does) for your user communtity then you are done.

    If you also want this value in the subject alternative name as a DNS field – then you’ll need to do a bit more. http://therowes.net/~greg/2008/01/08/creating-a-certificate-with-multiple-hostnames/ has a good example.

    The short of it is that you need to find the openssl.conf file which came with your openssl install (locate openss.cnf) and then edit/ensure it has these entries:

     ....
 [ v3_req ]
 basicConstraints = CA:FALSE
 keyUsage = nonRepudiation, digitalSignature, keyEncipherment
 ....
 subjectAltName          = @altdns

 ...
 [altdns]
 DNS.1   = *.arkadia.com
 DNS.2   = arkadia.com

    and then follow the instructions of akadia.com with the provisio that you pass a parameter 

    openssl req -config aboveedited.openssl.cf

    to the openssl commands pointing to above

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