Contents
How do I check what modules are available in Linux?
The easiest way to list modules is with the lsmod command….Listing modules
- “Module” shows the name of each module.
- “Size” shows the module size (not how much memory it is using)
- “Used by” shows each module’s usage count and the referring modules.
Where would you locate kernel modules?
Loadable kernel modules in Linux are loaded (and unloaded) by the modprobe command. They are located in /lib/modules or /usr/lib/modules and have had the extension . ko (“kernel object”) since version 2.6 (previous versions used the .o extension). The lsmod command lists the loaded kernel modules.
Which directory contains the initrd file?
Now that this file is an ext2 file system, mount the file to /mnt/initrd using the loop device. At the mount point, you now have a directory that represents an ext2 file system that you can populate for your initrd. Much of the rest of the script provides this functionality.
How are kernel modules loaded in the initrd?
The RAM disk/kernel image used to boot up Linux holds the initial modules that are used to get the system up; after the initial boot other modules are loaded as needed. In some cases, the kernel modules need to be included in the RAM disk. Examples would include the Fibre Channel Cards, disk controllers and file-system drivers.
How does the boot loader work with initrd?
When using initrd, the system typically boots as follows: the boot loader loads the kernel and the initial RAM disk the kernel converts initrd into a “normal” RAM disk and frees the memory used by initrd
How to write to the initrd file system?
(rw is only necessary if writing to the initrd file system.) With LILO, you add the option INITRD= to either the global section or to the section of the respective kernel in /etc/lilo.conf, and pass the options using APPEND, e.g.: For other boot loaders, please refer to the respective documentation.
When to use / dev / initrd in Linux?
Note: /dev/initrd is read-only and it can only be used once. As soon as the last process has closed it, all data is freed and /dev/initrd can’t be opened anymore. root=/dev/ram0 initrd is mounted as root, and the normal boot procedure is followed, with the RAM disk mounted as root.