Debian 11 Bullseye
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Create SSL Certificate (Self Signed)
  Create your server's self signed SSL Certificate.
If you use your server as a business, it had better buy and use Formal Certificate.
cd /etc/ssl/private

openssl genrsa -aes128 -out server.key 2048

Generating RSA private key, 2048 bit long modulus (2 primes)
e is 65537 (0x010001)
Enter pass phrase for server.key:              # set passphrase
Verifying - Enter pass phrase for server.key:  # confirm

# remove passphrase from private key

openssl rsa -in server.key -out server.key

Enter pass phrase for server.key:  
# input passphrase

writing RSA key
openssl req -new -days 3650 -key server.key -out server.csr

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) [AU]:JP                             # country code
State or Province Name (full name) [Some-State]:Hiroshima        # state
Locality Name (eg, city) []:Hiroshima                            # city
Organization Name (eg, company) [Internet Widgits Pty Ltd]:GTS   # company
Organizational Unit Name (eg, section) []:Server World           # department
Common Name (e.g. server FQDN or YOUR name) []     # server's FQDN
Email Address []                                  # admin email address

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:

openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650

Signature ok
subject=C = JP, ST = Hiroshima, L = Hiroshima, O = GTS, OU = Server World, CN =, emailAddress =
Getting Private key

total 12
-rw-r--r-- 1 root root 1334 Aug 19 19:31 server.crt
-rw-r--r-- 1 root root 1062 Aug 19 19:30 server.csr
-rw------- 1 root root 1675 Aug 19 19:30 server.key
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