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Unable to determine realpath cagefs error | Resolved

by | Nov 13, 2021

Unable to determine realpath cagefs error is no longer a problem with Bobcares by your side. 

At Bobcares, we offer solutions for every query, big and small, as a part of our Server Management Service.

Let’s take a look at how our Support Team came up with an easy solution to resolve a frustrating CageFS error.

How to resolve the “Unable to determine realpath cagefs” error

Have you been coming across the “Unable to determine realpath cagefs” error while trying to have a dedicated mount for the home partition? Well, you are in luck! Our Support Team came up with a solution for this specific issue recently for one of our long-term customers.

Before we take a look at the solution, let’s focus on CageFS. It is a virtualized, per-user file system that has the ability to encapsulate users, thereby preventing them from seeing one another as well as viewing confidential and sensitive information.

Moreover, it contains attacks including information disclosure attacks as well as privilege escalation attacks.

In this particular error scenario, the PHP-FHM error logs had these entries:

/opt/cpanel/ea-php72/root/usr/var/log/php-fpm/error.log

[15-Oct-2021 10:45:23] WARNING: [pool domain_tld] child 84287 said into stderr: "ERROR: [pool domain_tld] CageFS jail error Unable to determine realpath of /home2/$cpanel_user (No such file or directory): No such file or directory (2)"

Interestingly, this error seems to appear when the mounting task is carried out after “lvectl”. This prevents CageFS from locating the mount accurately.

Surprisingly, there is an easy fix for this error. All we have to do is remount via CageFS and restart lvectl with these commands:

cagefsctl --remount-all
systemctl restart lvectl

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Conclusion

To sum up, the skilled Support Engineers at Bobcares demonstrated how to resolve the frustrating CageFS error with ease.

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