Where is linux kernel located

kernel source code location in linux

I am working in Windows and running fedora through VMware. By default, the kernel source tree should be in usr/src/ directory. Instead I could find only an empty directory called kernels. The actual source code is missing there. When browsing I thought it might be in other directories like /boot . But I couldn’t find source tree there as well. I need to modify system call tables for which I should be able to access those source codes.

3 Answers 3

Kernel source is not installed by default. You can follow e.g. the instructions here to install the source and build your kernel.

You probably need to install the kernel-devel package.

On Fedora, all of the software is managed through a system called the Red Hat Package Manager (RPM). Every file (other than user data and other transient files like logs and such) is «owned» by a package. The ls command is from coreutils , the kernel is probably from kernel and BZFlag (the greatest Linux game ever) is provided by the bzflag package.

In the good old days, you would try to install software by using the rpm command (type » man rpm » for more information) and giving it the path to an RPM file that you had downloaded. The rpm command would then dutifully respond by informing you that you first need to satisfy 33 prerequisites. Then you would go download those 33 prerequisites and try to install them, only to find that each of those had their own prerequisites. And so on.

These days, Fedora has a nice set of online repositories of packages (and you can add others for third party software), and a program called yum that can download databases of all the packages, and you tell yum «install package foo for me» (by typing something like » yum install kernel-devel «) and it goes and figures out that in order to install that package, you need a bunch of other prerequisite packages, and so on. It then automatically downloads and installs everything you need, and away you go. For more information on the various incantations that make yum go, see » man yum «).

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Thread: Where is the Ubuntu Linux kernel located?

Quad Shot of Ubuntu

Join Date Jul 2007 Location Salt Lake City, Utah Beans 487 —> Beans 487 Distro Ubuntu 9.10 Karmic Koala

Where is the Ubuntu Linux kernel located?

I am curious because I wanted to play around with Kernel Check, but I ran out of room. I was in the middle of compiling a kernel and completely ran out of space on my /. How can I get rid of kernel that failed?

Also, how much room is required to compile the kernel?

Cake for coffee’s sake

Join Date Jul 2006 Location /usr/share/beer Beans 1,316 —> Beans 1,316 Distro Ubuntu 10.04 Lucid Lynx

Re: Where is the Ubuntu Linux kernel located?

Out of habit, I put the source in /usr/src/*

The running one is loaded from /boot/vmlinuz*

Registered Linux User #419773, Ubuntu User #8473 («It Is What It Is»)
If you type rm -Rf / as root at command line you will get herpes. then die. (okay, it’ll erase ALL your data)

Quad Shot of Ubuntu

Join Date Jul 2007 Location Salt Lake City, Utah Beans 487 —> Beans 487 Distro Ubuntu 9.10 Karmic Koala

Re: Where is the Ubuntu Linux kernel located?

What is usually in /usr/src? Mine currently has several folders totaling about five gigs. What is safe to remove in there?

Cake for coffee’s sake

Join Date Jul 2006 Location /usr/share/beer Beans 1,316 —> Beans 1,316 Distro Ubuntu 10.04 Lucid Lynx

Re: Where is the Ubuntu Linux kernel located?

They should all be labeled, mine currently holds only two directories: the actual kernel source directory and the kernel headers for my running kernel.

Registered Linux User #419773, Ubuntu User #8473 («It Is What It Is»)
If you type rm -Rf / as root at command line you will get herpes. then die. (okay, it’ll erase ALL your data)

Quad Shot of Ubuntu

Join Date Jul 2007 Location Salt Lake City, Utah Beans 487 —> Beans 487 Distro Ubuntu 9.10 Karmic Koala

Re: Where is the Ubuntu Linux kernel located?

total 24 drwxrwsr-x 6 root src 4096 2009-11-16 19:55 . drwxr-xr-x 11 root root 4096 2009-11-16 05:40 .. lrwxrwxrwx 1 root src 21 2009-11-16 05:56 linux -> /usr/src/linux-2.6.31 drwxr-xr-x 25 root root 4096 2009-11-16 19:08 linux-2.6.31 drwxr-xr-x 23 root root 4096 2009-10-27 18:16 linux-headers-2.6.31-14 drwxr-xr-x 7 root root 4096 2009-10-27 18:16 linux-headers-2.6.31-14-generic drwxr-sr-x 2 root src 4096 2009-11-16 05:37 oldpackages

I should be able to remove the following correct?
linux
linux-2.6.31
linux-headers-2.6.31-14
oldpackages

May the Ubuntu Be With You!

Re: Where is the Ubuntu Linux kernel located?

I’m just wondering why this stuff is in the Absolute Beginner Talk section?

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Quad Shot of Ubuntu

Join Date Jul 2007 Location Salt Lake City, Utah Beans 487 —> Beans 487 Distro Ubuntu 9.10 Karmic Koala

Re: Where is the Ubuntu Linux kernel located?

Was there a better place to put it? I didn’t notice a kernel section

So I was being a little slow yesterday. I should have just looked at the time stamps in /usr/src. I did indeed delete the files and folder that I listed above and nothing went wrong.

Also, I find it a little weird that when there is no space left in the / partition. That Gnome says the Power Manager isn’t setup properly and to contact the Admin.

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Location of the kernel binary (when not in /boot)?

However, this is an embedded device not a standard desktop. Is it possible that the kernel binary is located on a different storage location which isn’t mounted. Example: / is mounted on the SD card and the kernel is written on flash? If not, what are the options for locating the kernel binary?

Find out how the device boots, if possible. Conceivably it doesn’t have a local kernel at all and gets it from a tftp server.

3 Answers 3

/boot is the standard location for the kernel in desktop/server distributions, but embedded systems vary greatly. Where the kernel is stored entirely depends on your bootloader, and it may not be a file as embedded bootloaders are often not capable of reading Linux filesystems.

For example, with U-Boot (a popular embedded bootloader), you create an image with mkimage , which may then be written to a separate FAT partition or written in some other system-specific format. If the kernel image is on a FAT partition, that partition is often not mounted under Linux, since Linux never needs to access it (except during upgrades, but most embedded systems don’t upgrade their kernel separately from the bootloader).

The upshot is that you have to look for it. If you need help, you need to describe your system very precisely, and even then we may or may not be able to help depending on how popular your embedded system is. If you can’t find it on your own, consider asking for support from the providers of the embedded system.

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