How To Check Expiry Date Of Ssl Certificate In Linux


As a Linux user, I understand the importance of keeping SSL certificates up to date. SSL certificates are crucial for securing websites and ensuring the privacy of user data. One vital aspect of managing SSL certificates is checking their expiry date regularly.

In this article, I will guide you through the process of checking the expiry date of an SSL certificate in Linux. I will provide step-by-step instructions using the command line interface and share some personal insights along the way.

First, open your terminal

To begin, open your terminal application. You can do this by pressing Ctrl + Alt + T or by searching for “terminal” in your application launcher. The terminal is where we will run the commands to check the expiry date of an SSL certificate.

Using OpenSSL to check the expiry date

In Linux, we can use the openssl command-line tool to perform various operations related to SSL certificates. To check the expiry date of a certificate, follow these steps:

  1. Locate the SSL certificate file you want to check. Typically, SSL certificates are stored in the /etc/ssl/certs/ directory. If you are checking a certificate for a specific domain, it may be located in a different directory or bundled with other files.
  2. Once you have located the certificate file, open your terminal and navigate to the directory where the certificate is stored. You can use the cd command to change directories.
  3. Once you are in the correct directory, run the following command to check the expiry date of the certificate:
    openssl x509 -enddate -noout -in certificate.crt

The command will display the expiry date of the certificate in the following format:

notAfter=Dec 31 23:59:59 2022 GMT

By checking the expiry date, you can determine if your SSL certificate is still valid or if it needs to be renewed.

Additional Tips and Insights

Checking the expiry date of an SSL certificate is just one aspect of managing certificates. Here are a few additional tips and insights to keep in mind:

  • Regularly schedule automated checks: Set up a cron job or a scheduled task to automatically check the expiry date of your SSL certificates. This ensures that you are proactively aware of any impending expirations.
  • Consider using a certificate management tool: If you are managing multiple SSL certificates, you may find it beneficial to use a certificate management tool. These tools provide a centralized interface for managing and monitoring SSL certificates, including expiry dates.
  • Stay informed about SSL best practices: SSL technology evolves over time, and best practices change accordingly. Stay up to date with the latest recommendations and guidelines to ensure that your SSL certificates remain secure and properly configured.


Checking the expiry date of an SSL certificate in Linux is a crucial step in maintaining a secure web environment. By regularly monitoring the expiry dates, you can ensure that your certificates are up to date and valid. Remember to automate the process where possible and stay informed about SSL best practices for optimal certificate management.