Security News > 2021 > September > How to utilize openssl in Linux to check SSL certificate details
Learn tips on how you can use the Linux openssl command to find critical certificate details.
It's important to not only keep an eye on upcoming SSL certificate expirations but to completely verify the success of renewing/replacing these certificates.
Certificate files in Linux are generally in the /etc/pki/tls/certs folder or possibly within an application-specific folder such as /etc/httpd for Apache.
It's also equally useful to run a check against the port associated with an SSL certificate.
You can run this command to check the expiration date of a certificate.
Either use this command on the host system itself or run it remotely against that system, substituting for "Localhost" the fully qualified domain name of the host you wish to check and changing the port 443 as needed to match the open port associated with the SSL certificate.