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How to Generate CSR using Openssl in Linux

Before Generating CSR ,let see what is Openssl.

It is nothing but a core library ,which is used for general purpose in cryptography,it is an open source product which work towards the implementation of SSL and TLS protocols.

Talking about openssl, some people called the certificates generated from openssl as "self signed certificate".

lets go towards now,creating CSR and private key using openssl command,

Just log in to any of your Linux box and run following command as root user replacing the required information as per your need .

[root@SVR home]# openssl req -new -newkey  rsa:2048 -nodes -sha256 -out domain_name.csr -keyout domain_name.key -subj "/C=US/ST=state/L=locality/O=organization/OU=organization unit Dept/"

 You will get output like :

Then check whether ,all the information we have entered ,while creating CSR is proper ,by decoding the CSR from some online tool.

First do the cat to the csr file

[root@SVR home]# cat domain_name.csr


Now, to check whether ,you have entered the proper information while creating CSR, we need to check the content of the CSR,for this refer URL

And if you want self signed certificate ,then we can use below openssl command
to get a Certificate using csr and private key we have just created. 
Use below command for this purpose.

openssl x509 -signkey domain_name.key -sha256  -in domain_name.csr -req -days 365 -out domain.crt


domain_name.key ===== is  private key.
domain_name.csr ===== is csr.
-days ===== Number of days of validity ,you want for your cert.


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