Another instance of Certbot is already running – Solved – Linux guru

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Another instance of Certbot is already running

Certbot is a free and open-source software tool for automating the acquisition and renewal of SSL/TLS certificates. SSL/TLS certificates are cryptographic certificates that enable secure communication between a website and its users. The Electronic Frontier Foundation (EFF) created Certbot, which is widely used in the industry In this post I will show How to resolve Another instance of Certbot is already running error. Click on the link If you want to learn how to configure certbot and ssl in ubuntu server.

I got this error while configuring SSL on my website using certbot. So here is the steps which i used to resolve this Another instance of Certbot is already running error.

Understanding the Error:

While configuring SSL on your website using Certbot, you may have encountered the following error:

Reason: when you run certbot form your machine and unexpectedly stop the command, Then cert bot is not running but it left some .certbot.lock files behind.You need to kill the certbot instance form your machine.

Resolving the Error:

1. Identify and Kill the Lingering Certbot Instance:

Run the following command to locate lingering Certbot instances:

find / -type f -name ".certbot.lock"

If the command returns results, it indicates remaining Certbot locks. To remove them, execute:

find / -type f -name ".certbot.lock" -exec rm {} ;

2. Retry Certbot:

After removing the locks, attempt to run Certbot again for SSL configuration. The error should be resolved, allowing you to proceed with certificate acquisition or renewal..You can read more articles on my blog about Let’s Encrypt configuration for Nginx and for Kubernetes SSL.

See also  Secure nginx with Let's Encrypt on Ubuntu 18.04


By understanding the nature of the ‘Another instance of Certbot is already running’ error and following these steps to clear lingering locks, you can successfully overcome this obstacle in your SSL configuration journey. Explore additional articles on our blog for more information on Let us Encrypt configuration for Nginx or SSL setup in Kubernetes.

Note: In the world of SSL/TLS certificates and web security, ongoing learning is key. Stay tuned to our blog for more tutorials, troubleshooting guides, and best practices to improve the security of your web server.

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