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Simplify SSL Expiration Monitoring with GCP Uptime

Aamir Shahab
Aamir Shahab
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In today’s interconnected world, website security is of paramount importance. One crucial aspect of maintaining a secure website is ensuring that SSL certificates are up to date. Failure to renew SSL certificates in a timely manner can lead to security vulnerabilities and potential disruptions to your online services. To streamline this process, Google Cloud Platform (GCP) offers a powerful tool called Uptime, which can be utilised to create SSL expiration alerts. In this blog post, we will explore how you can leverage GCP Uptime to monitor SSL certificate expiration and receive timely notifications.

What is an Uptime check?

A GCP (Google Cloud Platform) Uptime Check is a service provided by Google Cloud that allows you to monitor the availability and performance of your applications or services hosted on Google Cloud. It periodically sends requests to your application or service from multiple locations around the world and checks if it responds within a specified time frame.

Step 1: Setting up Uptime Check

To begin, you need to configure an Uptime Check for your website. Uptime Check is a GCP service that periodically sends requests to a given URL and checks if it responds successfully. Follow these steps to create an Uptime Check:

  1. Go to the GCP Console and navigate to the Uptime Checks page.
  2. Click on “Create Uptime Check” and provide the necessary details, including the URL of your website.
  3. Configure the check frequency and other settings according to your requirements.
  4. To configure SSL certificates, authentication, headers, and ports for HTTP and HTTPS checks, click More target options:

Step 2: Defining Alerting Policy

Now that the Uptime Check is in place, you need to define an alerting policy to receive notifications when SSL expiration is approaching. To create an alerting policy that notifies you when an uptime check fails, do the following:

  1. In the Google Cloud console, select Monitoring or click the following button:
    Go to Monitoring
  2. In the navigation pane, click Uptime checks.
  3. Locate the uptime check that you want to monitor, click  More , and select Add alert policy.The alerting policy configuration dialog opens and the Condition is pre-configured.
  4. In the navigation pane of the dialog, select Notifications and name.
  5. Add your notification channels, enter a name for the alerting policy. You can also add documentation that you want included in notifications.

Step 3: Testing and Fine-tuning

Once you’ve set up the Uptime Check and alerting policy, it’s crucial to test the configuration and fine-tune the settings. Perform the following actions:

  1. Manually trigger a certificate expiration by letting it expire or setting a test expiration date.
  2. Monitor the alerts received through the configured notification channels.
  3. Adjust the alerting policy as needed, considering factors like lead time for certificate renewal and your organisation’s specific requirements.

Step 4: Remediation and Certificate Renewal

Receiving alerts about SSL certificate expiration is essential, but it’s equally important to have a clear plan for remediation and certificate renewal. When you receive an alert indicating an impending expiration, take the following actions:

  1. Identify the specific SSL certificate that is expiring by checking the details provided in the alert.
  2. Contact your certificate authority (CA) or follow your organization’s certificate management process to initiate the renewal process.
  3. Obtain the renewed certificate from the CA and ensure it is properly installed on your web server or load balancer.
  4. Update the configuration of your Uptime Check to use the new certificate for future monitoring.

Step 5: Monitoring and Continuous Improvement

SSL expiration alerts are an essential part of maintaining website security, but monitoring SSL certificates should be an ongoing process. Continuously monitor the validity of your SSL certificates and periodically review your alerting policies to ensure they align with your organization’s requirements. Consider the following best practices:

  1. Regularly review the expiry thresholds set in your alerting policies to ensure they provide sufficient lead time for certificate renewal.
  2. Monitor the success of your Uptime Checks to ensure they are accurately detecting SSL certificate expiration and triggering alerts.
  3. Perform periodic audits of your SSL certificate inventory to identify any certificates that may have been overlooked or manually installed on servers without proper monitoring.

Benefits of Using GCP Uptime for SSL Expiration Alerts

  1. Automation: By leveraging Uptime Checks and alerting policies, you automate the process of monitoring SSL certificate expiration, saving time and reducing the risk of oversight or human error.
  2. Proactive Security: Timely alerts enable you to take proactive measures to renew SSL certificates before they expire, minimizing the risk of security vulnerabilities and ensuring uninterrupted service.
  3. Centralized Monitoring: GCP Uptime provides a centralized platform to monitor the status of SSL certificates across multiple websites or services, making it easier to manage and maintain security standards.
  4. Integration with Other GCP Services: Uptime integrates seamlessly with other GCP services, such as Stackdriver Logging and Monitoring, enabling you to have a comprehensive view of your website’s performance and security.


Monitoring SSL certificate expiration is a critical aspect of website security, and GCP Uptime offers a powerful solution for simplifying this process. By setting up Uptime Checks and alerting policies, you can automate the monitoring of SSL certificates and receive timely notifications when expiration is approaching. This allows you to proactively renew certificates and maintain a secure online presence. Remember to regularly review and fine-tune your alerting policies to align with your organization’s requirements. With GCP Uptime, you can enhance your website security posture and ensure a smooth and secure user experience.
For your next reading I would recommend to “Harnessing the Power of GCP Committed Use” by Rahul Miglani, it let you know the concept of GCP Committed Use and explore how it can be effectively utilised to maximise the benefits of cloud computing while optimising costs.


Aamir Shahab

Aamir Shahab

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