How to create a Self-Signed SSL Certificate in Linux?

You can create a self-signed SSL certificate in Linux by following these instructions:

1. Open your VPS console from the Power Management control panel.
2. Log in to your VPS by entering your username and password.
3. Create an SSL private key using the following command:

   # openssl genrsa -des3 -out self-ssl.key 2048

   The output should look like this:

   Generating RSA private key, 1024 bit long modulus
   ...++++++
   ...............++++++
   e is 65537 (0x10001)
   Enter pass phrase for self-ssl.key: Type-Your-PassPhrase-Here
   Verifying - Enter pass phrase for self-ssl.key: Retype-Your-PassPhrase-Here
   

4. Create a Certificate Signing Request (CSR) using the following command:

   # openssl req -new -key self-ssl.key -out self-ssl.csr

   The output should look like this:

   Enter pass phrase for self-ssl.key: Type-Your-PassPhrase-Here
   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.
   -----
   Country Name (2 letter code) [XX]:AU
   State or Province Name (full name) []:WA
   Locality Name (eg, city) [Default City]:Perth
   Organization Name (eg, company) [Default Company Ltd]:samplecompany pty
   Organizational Unit Name (eg, section) []:IT
   Common Name (eg, your name or your server's hostname) []:myserver.example.com
   Email Address []:admin@myserver.example.com
   Please enter the following 'extra' attributes
   to be sent with your certificate request
   A challenge password []:
   An optional company name []:

5. Generate the SSL certificate using the following command:

   # openssl x509 -req -days 365 -in self-ssl.csr -signkey self-ssl.key -out self-ssl.crt

   The output should look like this:

   Signature ok
   subject=/C=AU/ST=WA/L=Perth/O=samplecompany pty LTD/OU=IT/CN=myserver.example.com/emailAddress=
   admin@myserver.example.com
   Getting Private key

Congratulations, you have сreated self-signed SSL certificate in Linux.