The filesystem “/boot” mounted at “/boot” reached “critical” status because you currently use 90% of its available blocks.

Symptoms

You receive a notification containing the following.

CONFIG_TEXT: The filesystem “/boot” mounted at “/boot” reached “critical” status because you currently use 90% of its available blocks.

Description

By default, servers are configured to keep 5 kernels. This can result in servers with small boot partitions filling up. RHEL 7-based systems and earlier can use the package-cleanup command to remove old kernels, while RHEL 8-based systems and later can use the dnf --oldinstallonly command. Each old kernel on Ubuntu systems must be uninstalled manually.

Procedure

1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.

2. Run the following command depending on OS version.

   CentOS / CloudLinux 7

   # package-cleanup --oldkernels --count=2

   AlmaLinux / CloudLinux 8 and higher

   # dnf remove --oldinstallonly --setopt installonly_limit=2 kernel