Создание самоподписного сертификата openssl

Для создания самоподписного сертификата с помощью OpenSSL:

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout server.key -out server.crt

openssl: основной инструмент командной строки для создания и управления сертификатами, ключами и другими файлами OpenSSL.

req: This subcommand specifies that we want to use X.509 certificate signing request (CSR) management. The "X.509" is a public key infrastructure standard that SSL and TLS adheres to for its key and certificate management. We want to create a new X.509 cert, so we are using this subcommand.

-x509: This further modifies the previous subcommand by telling the utility that we want to make a self-signed certificate instead of generating a certificate signing request, as would normally happen.

-nodes: This tells OpenSSL to skip the option to secure our certificate with a passphrase. We need Nginx to be able to read the file, without user intervention, when the server starts up. A passphrase would prevent this from happening because we would have to enter it after every restart.

-days 365: This option sets the length of time that the certificate will be considered valid. We set it for one year here.

-newkey rsa:2048: This specifies that we want to generate a new certificate and a new key at the same time. We did not create the key that is required to sign the certificate in a previous step, so we need to create it along with the certificate. The rsa:2048 portion tells it to make an RSA key that is 2048 bits long.

-keyout: This line tells OpenSSL where to place the generated private key file that we are creating.

-out: This tells OpenSSL where to place the certificate that we are creating.