Kernel Management

Warewulf nodes require a Linux kernel to boot. As of Warewulf v4.6, the kernel you wish to use must be present in the relevant image. Warewulf locates and provisions the kernel automatically for any node configured to use that image.

You can see what kernels are available in imported images by using the wwctl image kernels command:

# wwctl image kernels
Image                Kernel                                              Version          Default  Nodes
-----                ------                                              -------          -------  -----
newroot-test         /boot/vmlinuz-5.14.0-427.37.1.el9_4.aarch64         5.14.0-427.37.1  true     0
newroot-test         /lib/modules/5.14.0-427.37.1.el9_4.aarch64/vmlinuz  5.14.0-427.37.1  false    0
rocky-8              /boot/vmlinuz-4.18.0-372.13.1.el8_6.x86_64          4.18.0-372.13.1  true     2
rocky-8              /lib/modules/4.18.0-372.13.1.el8_6.x86_64/vmlinuz   4.18.0-372.13.1  false    0
rocky-9.3            /lib/modules/5.14.0-362.13.1.el9_3.aarch64/vmlinuz  5.14.0-362.13.1  true     0
rockylinux-9-custom  /lib/modules/5.14.0-427.40.1.el9_4.aarch64/vmlinuz  5.14.0-427.40.1  true     0

Kernel Version

If an image includes multiple kernels, the desired kernel may be selected by specifying the desired version or an explicit path.

# wwctl node set n1 --kernelversion=4.18.0-372.13.1
# wwctl node set n1 --kernelversion=/boot/vmlinuz-4.18.0-372.13.1.el8_6.x86_64