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74 lines
2.6 KiB
Text
74 lines
2.6 KiB
Text
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Slackware initrd mini HOWTO
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by Patrick Volkerding, volkerdi@slackware.com
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Thu Nov 14 19:43:44 UTC 2024
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This document describes how to create and install an initrd.
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Also see "man mkinitrd".
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1. What is an initrd?
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2. Why to I need an initrd?
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3. How do I build the initrd?
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4. Now that I've built an initrd, how do I use it?
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1. What is an initrd?
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Initrd stands for "initial ramdisk". An initial ramdisk is a very small
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Linux filesystem that is loaded into RAM and mounted as the kernel boots,
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and before the main root filesystem is mounted.
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2. Why do I need an initrd?
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The usual reason to use an initrd is because you need to load kernel
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modules before mounting the root partition, or because you need additional
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userspace support for doing so (as with LVM). Modern Linux is practically
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expected to be using an initrd, so even in cases where it *works* to boot
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without one, you're probably less likely to run into bugs by using one.
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3. How do I build the initrd?
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Just installing the kernel package will automatically run the geninitrd
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script to produce an initrd, so normally you won't need to build one --
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it will be done for you. However, if you need to generate an initrd you
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can do so by just running "geninitrd" which will build an initrd for the
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newest kernel in /boot. You can also specify the kernel to build an initrd
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for on the command line, like this:
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geninitrd /boot/vmlinuz-6.11.7
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If you need specific modules, or you'd like to use a different initrd
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generator than Slackware's mkinitrd, or to make other adjustments, see
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the /etc/default/geninitrd configuration file. You can also disable
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automatic initrd generation if you don't want it.
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4. Now that I've built an initrd, how do I use it?
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Now that you've got an initrd (/boot/initrd.gz), you'll want to load
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it along with the kernel at boot time. If you use LILO for your boot
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loader you'll need to edit /etc/lilo.conf and add a line to load the
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initrd. Here's an example section of lilo.conf showing how this is
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done:
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# Linux bootable partition config begins
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image = /boot/vmlinuz-generic
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initrd = /boot/initrd-generic.img
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root = /dev/sda6
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label = Slackware
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read-only
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# Linux bootable partition config ends
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The initrd is loaded by the "initrd = /boot/initrd-generic.img" line.
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Just add the line right below the line for the kernel image you use.
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Save the file, and then run LILO again ('lilo' at the command line).
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You'll need to run lilo every time you edit lilo.conf or rebuild the
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initrd.
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Other bootloaders also support the use of an initrd.
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See the documentation for those programs for details on using an
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initrd with them.
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---------
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Have fun!
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