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Now, run the command below to start creating your CSR. Some fields may be left blank by pressing the enter key.
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When creating a CSR, you would be asked to provide some information. Your private key will be saved in the current working directory. You can use anything in place of ubuntuserver. But in this case, you are going to sign it by yourself. Firstly, run the command below to generate and save your private key which will be used to sign the SSL certificate. The CSR is what you would normally send to a third-party certificate authority for signing. The next step is to create a Certificate Signing Request (CSR). $ sudo openssl genrsa -out my_key.keyĮxcept you specified another location, your private key will be stored in the current working directory. You can change my_key in the command below to your own value. This private key is required to sign your SSL certificate. Create OpenSSL private keyįirst, run the command below to create and save your private key. In some situations where you have an existing private key and csr, the following steps will suffice. Create a Self-signed certificate using an existing private key and CSR -days - The number of days the certificate is validĬN= - The fully qualified domain name.-x509 - Create an X.509 format certificate.- nodes - Skip the step to create the certificate with a passphrase.-out - Indicates file name to store the new certificate.-keyout - Private key file name where the key will be stored.If not specified, it will create a 2048 bit long key by default -newkey rsa:4096 - This creates a 4096 bit long RSA key.req - Make a certificate signing request.The certificate and the key file will be created in the current directory unless another directory is explicitly specified. This creates a self-signed certificate that will be valid for 365 days. To create a self-signed SSL certificate, type: $ sudo openssl req -x509 -nodes -days 365 -newkey rsa:4096 -keyout my_key.key -out my_cert.crt As we are generating a self-signed certificate it's not really required to output a CSR file, as it's only required if you are sending CSR information to a third-party certificate authority. The openssl command syntax is: openssl command options arguments Create a Self-signed SSL Certificate with OpenSSLĪfter confirming that the OpenSSL tool is installed on your Linux machine, you may proceed to create your self-signed certificate.ĬSR information is required to generate a private key.
#Openssl generate self signed certificate install#
On Ubuntu and Debian based distributions: $ sudo apt install openssl On Red Hat based distributions: $ sudo dnf install openssl $ sudo yum install openssl