The Linux Installation HOWTO

1.1. Purpose of this document

Linux is a freely-distributable implementation of Unix for inexpensive personal machines (it was developed on 386s, and now supports 486, 586, Pentium, PowerPC, Sun Sparc, ARM and DEC Alpha hardware, and even the IBM System 390 mainframe!). It supports a wide range of software, including X Windows, Emacs, TCP/IP networking (including SLIP), and many applications.

This document assumes that you have heard of and know about Linux, and now want to get it running. It focuses on the Intel base version, which is the most popular, but much of the advice applies on Power PCs, Sparcs and Alphas as well.

1.2. Translations

This document has been translated to Catalan and Slovenian and Czech.

1.3. Other sources of information

If you are new to Linux, there are several sources of basic information about the system. The best place to find these is at the at Linux Documentation Project home page. You can find the latest version of this document there.

You should probably start by browsing the resources under General Linux Information; the Linux INFO-SHEET and the Linux META-FAQ. The `Linux Frequently Asked Questions' document contains many common questions (and answers!) about Linux -- it is a ``must read'' for new users.

The Linux Documentation Project is writing a set of manuals and books about Linux, all of which are freely distributable on the net and available from the LDP home page.

The book ``Linux Installation and Getting Started'' is a complete guide to getting and installing Linux, as well as how to use the system once you've installed it. It contains a complete tutorial to using and running the system, and much more information than is contained here. You can browse it, or download a copy, from the LDP home page.

Finally, there is a rather technical Guide to x86 Bootstrapping. This document is NetBSD- rather than Linux-oriented, but contains useful material on disk configuration and boot managers for multi-OS setups.

Please do not email me asking for installation help. Even if I had the time to handle such requests, troubleshooting by mail is much less efficient than asking help from your local Linux user's group. You can find worldwide contact information for Linux user groups on the LDP site.

1.4. New versions of this document

New versions of the Linux Installation HOWTO will be periodically posted to comp.os.linux.help and comp.os.linux.announce and news.answers. They will also be uploaded to various Linux WWW and FTP sites, including the LDP home page.

You can also view the latest version of this on the World Wide Web via the URL http://www.linuxdoc.org/HOWTO/Installation-HOWTO.html.

1.5. Feedback and Corrections

If you have questions or comments about this document, please feel free to mail Eric S. Raymond, at <esr@thyrsus.com>. I welcome any suggestions or criticisms. If you find a mistake with this document, please let me know so I can correct it in the next version. Thanks.

Please do not mail me questions about how to solve hardware problems encountered during installation. Consult Linux Installation and Getting Started, bug your vendor, or consult the Linux newsgroup comp.os.linux.setup. This HOWTO is intended to be rapid, painless guide to normal installation -- a separate HOWTO on hardware problems and diagnosis is in preparation.

4.1. Hardware requirements

What kind of system is needed to run Linux? This is a good question; the actual hardware requirements for the system change periodically. The Linux Hardware-HOWTO, gives a (more or less) complete listing of hardware supported by Linux. The Linux INFO-SHEET, provides another list.

For the Intel versions, a hardware configuration that looks like the following is required:

Any 80386, 80486, Pentium or Pentium II processor will do. Non-Intel clones of the 80386 and up will generally work. You do not need a math coprocessor, although it is nice to have one.

The ISA, EISA, VESA Local Bus and PCI bus architectures are supported. The MCA bus architecture (found on IBM PS/2 machines) has been minimally supported since the 2.1.x kernels, but may not be ready for prime time yet.

You need at least 4 megabytes of memory in your machine. Technically, Linux will run with only 2 megs, but most installations and software require 4. The more memory you have, the happier you'll be. I suggest an absolute minimum of 16 megabytes if you're planning to use X-Windows; 64 is better.

Of course, you'll need a hard drive and an AT-standard drive controller. All MFM, RLL, and IDE drives and controllers should work. Many SCSI drives and adaptors are supported as well; the Linux SCSI-HOWTO contains more information on SCSI. If you are assembling a system from scratch to run Linux, the small additional cost of SCSI is well worth it for the extra performance and reliability it brings.

You'll want a CD-ROM drive; effectively all Linux distributions are now CD-ROM based. If your machine was built in 1998 or later, you should be able to actually boot your Linux's installer right off the CD-ROM without using a boot floppy.

If your CD-ROM is ATAPI, SCSI, or true IDE you should have no problem making it work (but watch for cheap drives advertising "IDE" interfaces that aren't true IDE). If your CD-ROM uses a proprietary interface card, it's possible the installation kernel you're going to boot from floppy won't be able to see it -- and an inaccessible CD-ROM is a installation show-stopper. Also, CD-ROMs that attach to your parallel port won't work at all. If you're in doubt, consult the Linux CD-ROM HOWTO for a list and details of supported hardware.

If your CD-ROM isn't in your machine's boot sequence, you will need a 3.5" floppy drive. While 5.25" floppies are supported under Linux, they are little-enough used that you should not count on disk images necessarily fitting on them. (A stripped-down Linux can actually run on a single floppy, but that's only useful for installation and certain troubleshooting tasks.)

You also need an MDA, Hercules, CGA, EGA, VGA, or Super VGA video card and monitor. In general, if your video card and monitor work under MS-DOS or Windows then they should work under Linux. However, if you wish to run the X window system, there are other restrictions on the supported video hardware. The Linux XFree86-HOWTO, contains more information about running X and its requirements.

If you're running on a box that uses one of the Motorola 68K processors (including Amiga, Atari, or VMEbus machines), see the Linux/m68k FAQ for information on minimum requirements and the state of the port. The FAQ now says m68k Linux is as stable and usable as the Intel versions.

4.2. Space requirements and coexistence

You'll need free space for Linux on your hard drive. The amount of space needed depends on how much software you plan to install. Today most installations require somewhere in the ballpark of a gigabyte of space. This includes space for the software, swap space (used as virtual RAM on your machine), and free space for users, and so on.

It's conceivable that you could run a minimal Linux system in 80 megs or less (this used to be common when Linux distributions were smaller), and it's conceivable that you could use two gigabytes or more for all of your Linux software. The amount varies greatly depending on the amount of software you install and how much space you require. More about this later.

Linux will co-exist with other operating systems, such as MS-DOS, Microsoft Windows, or OS/2, on your hard drive. (In fact you can even access MS-DOS files and run some MS-DOS programs from Linux.) In other words, when partitioning your drive for Linux, MS-DOS or OS/2 live on their own partitions, and Linux exists on its own. We'll go into more detail about such ``dual-boot'' systems later.

You do not need to be running MS-DOS, OS/2, or any other operating system to use Linux. Linux is a completely stand-alone operating system and does not rely on other OSs for installation and use.

In all, the minimal setup for Linux is not much more than is required for most MS-DOS or Windows 3.1 systems sold today (and it's a good deal less than the minimum for Windows 95!). If you have a 386 or 486 with at least 4 megs of RAM, then you'll be happy running Linux. Linux does not require huge amounts of disk space, memory, or processor speed. Matt Welsh, the originator of this HOWTO, used to run Linux on a 386/16 MHz (the slowest machine you can get) with 4 megs of RAM, and was quite happy. The more you want to do, the more memory (and faster processor) you'll need. In our experience a 486 with 16 megabytes of RAM running Linux outdoes several models of expensive workstations.

4.3. Time requirements

Start to finish, a modern Linux installation from CD-ROM can be expected to take from ninety minutes to three hours.

4.4. Choosing a Linux distribution

Before you can install Linux, you need to decide on one of the ``distributions'' of Linux which are available. There is no single, standard release of the Linux software---there are many such releases. Each release has its own documentation and installation instructions. All distributions pretty much share the same underlying codebase, however.

Linux distributions are available both via anonymous FTP and via mail order on diskette, tape, and CD-ROM. There are many checklists and comparative reviews of Linux distributions out there. The Linux Weekly News site, in addition to being an excellent general source of news and information, carries a weekly report on distributions with pointers to many of them.

In the dim and ancient past when this HOWTO was first written (1992-93), most people got Linux by tortuous means involving long downloads off the Internet or a BBS onto their DOS machines, followed by an elaborate procedure which transferred the downloads onto multiple floppy disks. One of these disks would then be booted and used to install the other dozen. With luck (and no media failures) you'd finish your installation many hours later with a working Linux. Or maybe not.

While this path is still possible (and you can download any one of several distributions from Metalab), there are now much less strenuous ways. The easiest is to buy one of the high-quality commercial Linux distributions distributed on CD-ROM, such as Red Hat, Debian, Linux Pro, or WGS. These are typically available for less than $50 at your local bookstore or computer shop, and will save you many hours of aggravation.

You can also buy anthology CD-ROMs such as the InfoMagic Linux Developer's Resource set. These typically include several Linux distributions and a recent dump of major Linux archive sites, such as metalab or tsx-11.

In the remainder of this HOWTO we will focus on the steps needed to install from an anthology CD-ROM, or one of the lower-end commercial Linuxes that doesn't include a printed installation manual. If your Linux includes a paper manual some of this HOWTO may provide useful background, but you should consult the manual for detailed installation instructions.

5.1. First Installation Steps: The Easy Way

If you have an EIDE/ATAPI CDROM (normal these days), check your machine's BIOS settings to see if it has the capability to boot from CD-ROM. Most machines made after mid-1997 can do this.

If yours is among them, change the settings so that the CD-ROM is checked first. This is often in a 'BIOS FEATURES' submenu of the BIOS configuration menus.

Then insert the installation CD-ROM. Reboot. You're started.

If you have a SCSI CDROM you can often still boot from it, but it gets a little more motherboard/BIOS dependent. Those who know enough to spend the extra dollars on a SCSI CDROM drive probably know enough to figure it out.

5.2. First Installation Steps: The Hard Way

• Make installation floppies.

• Boot an installation mini-Linux from the floppies in order to get access to the CD-ROM.

5.3. Continuing the Installation

• Prepare the Linux filesystems. (If you didn't edit the disk partition table earlier, you will at this stage.)

• Install a basic production Linux from the CD-ROM.

• Boot Linux from the hard drive.

• (Optional) Install more packages from CD-ROM.

5.4. Basic Parts of an Installation Kit

Here are the basic parts of an installable distribution:

• The README and FAQ files. These will usually be located in the top-level directory of your CD-ROM and be readable once the CD-ROM has been mounted under Linux. (Depending on how the CD-ROM was generated, they may even be visible under DOS/Windows.) It is a good idea to read these files as soon as you have access to them, to become aware of important updates or changes.

• A number of bootdisk images (often in a subdirectory). If your CD-ROM is not bootable, one of these is the file that you will write to a floppy to create the boot disk. You'll select one of the above bootdisk images, depending on the type of hardware that you have in your system.

The issue here is that some hardware drivers conflict with each other in strange ways, and instead of attempting to debug hardware problems on your system it's easier to use a boot floppy image with only the drivers you need enabled. (This will have the nice side effect of making your kernel smaller.)

• A rescue disk image. This is a disk containing a basic kernel and tools for disaster recovery in case something trashes the kernel or boot block of your hard disk.

• RAWRITE.EXE. This is an MS-DOS program that will write the contents of a file (such as a bootdisk image) directly to a floppy, without regard to format.

You only need RAWRITE.EXE if you plan to create your boot and root floppies from an MS-DOS system. If you have access to a UNIX workstation with a floppy drive instead, you can create the floppies from there, using the `dd' command, or possibly a vendor-provided build script. See the man page for dd(1) and ask your local UNIX gurus for assistance. There's a dd example later in this document.

• The CD-ROM itself. The purpose of the boot disk is to get your machine ready to load the root or installation disks, which in turn are just devices for preparing your hard disk and copying portions of the CD-ROM to it. If your CD-ROM is bootable, you can boot it and skip right to preparing your disk.

6.1. Getting prepared for installation

Linux makes more effective use of PC hardware than MS-DOS, Windows or NT, and is accordingly less tolerant of misconfigured hardware. There are a few things you can do before you start that will lessen your chances of being stopped by this kind of problem.

First, collect any manuals you have on your hardware -- motherboard, video card, monitor, modem, etc. -- and put them within easy reach.

Second, gather detailed information on your hardware configuration. One easy way to do this, if you're running MS-DOS 5.0, or up, is to print a report from the Microsoft diagnostic utility msd.exe (you can leave out the TSR, driver, memory-map, environment-strings and OS-version parts). Among other things, this will guarantee you full and correct information on your video card and mouse type, which will be helpful in configuring X later on.

Third, check your machine for configuration problems with supported hardware that could cause an un-recoverable lockup during Linux installation.

• It is possible for a DOS/Windows system using IDE hard drive(s) and CD ROM to be functional even with the master/slave jumpers on the drives incorrectly set. Linux won't fly this way. If in doubt, check your master-slave jumpers!

• Is any of your peripheral hardware designed with neither configuration jumpers nor non-volatile configuration memory? If so, it may require boot-time initialization via an MS-DOS utility to start up, and may not be easily accessible from Linux. CD-ROMs, sound cards, Ethernet cards and low-end tape drives can have this problem. If so, you may be able to work around this with an argument to the boot prompt; see theLinux Boot Prompt HOWTO for details).

• Some other operating systems will allow a bus mouse to share an IRQ with other devices. Linux doesn't support this; in fact, trying it may lock up your machine. If you are using a bus mouse, see the Linux Bus Mouse HOWTO, for details.

If possible, get the telephone number of an experienced Linux user you can call in case of emergency. Nine times out of ten you won't need it, but it's comforting to have.

Budget time for installation. That will be about one hour on a bare system or one being converted to all-Linux operation. Or up to three hours for a dual-boot system (they have a much higher incidence of false starts and hangups).

6.2. Creating the boot and root floppies

(This step is only needed if you can't boot from a CD-ROM.)

Your Linux CD-ROM may come with installation aids that will take you through the process of building boot, root, and rescue disks with interactive prompts. These may be an MS-DOS installation program (such as the Red Hat redhat.exe program) or a Unix script, or both.

If you have such a program and can use it, you should read the rest of this subsection for information only. Run the program to do actual installation -- its authors certainly knew more about the specific distribution than I, and you'll avoid many error-prone hand-entry steps.

More detailed information on making bootdisks, see the Linux Bootdisk HOWTO.

Your first step will be to select a boot-disk image to fit your hardware. If you must do this by hand, you'll generally find that either (a) the bootdisk images on your CD-ROM are named in a way that will help you pick a correct one, or (b) there's an index file nearby describing each image.

Next, you must create floppies from the bootdisk image you selected, and optionally from the rescue disk images. This is where the MS-DOS program RAWRITE.EXE comes into play.

Next, you must have two or three high-density MS-DOS formatted floppies. (They must be of the same type; that is, if your boot floppy drive is a 3.5" drive, both floppies must be high-density 3.5" disks.) You will use RAWRITE.EXE to write the bootdisk images to the floppies.

Invoke it with no arguments, like this:

C:\> RAWRITE

Answer the prompts for the name of the file to write and the floppy to write it to (such as A:). RAWRITE will copy the file, block-by-block, directly to the floppy. Also use RAWRITE for the root disk image (such as COLOR144). When you're done, you'll have two floppies: one containing the boot disk, the other containing the root disk. Note that these two floppies will no longer be readable by MS-DOS (they are ``Linux format'' floppies, in some sense).

You can use the dd(1) commands on a UNIX system to do the same job. (For this, you will need a UNIX workstation with a floppy drive, of course.) For example, on a Sun workstation with the floppy drive on device /dev/rfd0, you can use the command:

$ dd if=bare of=/dev/rfd0 obs=18k

You must provide the appropriate output block size argument (the `obs' argument) on some workstations (e.g., Suns) or this will fail. If you have problems the man page for dd(1) may be instructive.

Be sure that you're using brand-new, error-free floppies. The floppies must have no bad blocks on them.

Note that you do not need to be running Linux or MS-DOS in order to install Linux. However, running Linux or MS-DOS makes it easier to create the boot and root floppies from your CD-ROM. If you don't have an operating system on your machine, you can use someone else's Linux or MS-DOS just to create the floppies, and install from there.

6.3. Repartitioning your DOS/Windows drives

On most used systems, the hard drive is already dedicated to partitions for MS-DOS, OS/2, and so on. You'll need to resize these partitions in order to make space for Linux. If you're going to run a dual-boot system, it's strongly recommended that you read one or more of the following mini-HOWTOS, which describe different dual-boot configurations.

• The DOS-Win95-OS2-Linux mini-HOWTO.

• The Linux+Win95 mini-HOWTO.

• The Linux+NT-Loader mini-HOWTO

Even if they are not directly applicable to your system, they will help you understand the issues involved.

Some Linuxes will install to a directory on your MS-DOS partition. (This is different than installing from an MS-DOS partition.) Instead, you use the ``UMSDOS filesystem'', which allows you to treat a directory of your MS-DOS partition as a Linux filesystem. In this way, you don't have to repartition your drive.

I only suggest using this method if your drive already has four partitions (the maximum supported by DOS) and repartitioning would be more trouble than it's worth (it slows down your Linux due to filename translation overhead). Or, if you want to try out Linux before repartitioning, this is a good way to do so. But in most cases you should re-partition, as described here. If you do plan to use UMSDOS, you are on your own -- it is not documented in detail here. From now on, we assume that you are NOT using UMSDOS, and that you will be repartitioning.

A partition is just a section of the hard drive set aside for a particular operating system to use. If you only have MS-DOS installed, your hard drive probably has just one partition, entirely for MS-DOS. To use Linux, however, you'll need to repartition the drive, so that you have one partition for MS-DOS, and one (or more) for Linux.

Partitions come in three flavors: primary, extended, and logical. Briefly, primary partitions are one of the four main partitions on your drive. However, if you wish to have more than four partitions per drive, you need to replace the last primary partition with an extended partition, which can contain many logical partitions. You don't store data directly on an extended partition---it is used only as a container for logical partitions. Data is stored only on either primary or logical partitions.

To put this another way, most people use only primary partitions. However, if you need more than four partitions on a drive, you create an extended partition. Logical partitions are then created on top of the extended partition, and there you have it---more than four partitions per drive.

Note that you can easily install Linux on the second drive on your system (known as D: to MS-DOS). You simply specify the appropriate device name when creating Linux partitions. This is described in detail below.

Back to repartitioning your drive. It used to be that there was no way to resize partitions without destroying the data on them. Nowadays there are partitioning utilities that can resize non-destructively; they know about the structure of file systems, can find the free space on a file system, and can move file data around on the partition to move free space where it needs to be in order for a resize to work properly. It's still suggested that you make a full backup before using one of these, in case of program or human error.

Under Linux GNU parted allows you to create, destroy, resize and copy partitions. It supports ext2, FAT16, and FAT32 filesystems, Linux swap devices; it also knows about MS-DOS disk labels. Parted is useful for creating space for new operating systems, reorganising disk usage, copying data between hard disks, and disk imaging. It is relatively new code, but is reported to work well and not trash data.

There is a non-destructive disk repartitioner available for MS-DOS, called FIPS. With FIPS, a disk optimizer (such as Norton Speed Disk), and a little bit of luck, you should be able to resize MS-DOS partitions without destroying the data on them.

The older method of resizing a partition, if you don't have one of these resizing partition editors available, is to delete the partition(s), and re-create them with smaller sizes. If you use this method, you absolutely must make a backup in order to save any of your data.

The classic way to modify partitions is with the program FDISK. For example, let's say that you have an 80 meg hard drive, dedicated to MS-DOS. You'd like to split it in half---40 megs for MS-DOS and 40 megs for Linux. In order to do this, you run FDISK under MS-DOS, delete the 80 meg MS-DOS partition, and re-create a 40 meg MS-DOS partition in its place. You can then format the new partition and reinstall your MS-DOS software from backups. 40 megabytes of the drive is left empty. Later, you create Linux partitions on the unused portion of the drive.

In short, you should do the following to resize MS-DOS partitions with FDISK:

1. Make a full backup of your system.

2. Create an MS-DOS bootable floppy, using a command such as

   FORMAT /S A:

   Copy the files FDISK.EXE and FORMAT.COM to this floppy, as well as any other utilities that you need. (For example, utilities to recover your system from backup.)

3. Boot the MS-DOS system floppy.

4. Run FDISK, possibly specifying the drive to modify (such as C: or D:).

5. Use the FDISK menu options to delete the partitions which you wish to resize. This will destroy all data on the affected partitions.

6. Use the FDISK menu options to re-create those partitions, with smaller sizes.

7. Exit FDISK and re-format the new partitions with the FORMAT command.

8. Restore the original files from backup.

Note that MS-DOS FDISK will give you an option to create a ``logical DOS drive''. A logical DOS drive is just a logical partition on your hard drive. You can install Linux on a logical partition, but you don't want to create that logical partition with MS-DOS fdisk. So, if you're currently using a logical DOS drive, and want to install Linux in its place, you should delete the logical drive with MS-DOS FDISK, and (later) create a logical partition for Linux in its place.

The mechanism used to repartition for OS/2 and other operating systems is similar. See the documentation for those operating systems for details.

6.4. Creating partitions for Linux

After repartitioning your drive, you need to create partitions for Linux. Before describing how to do that, we'll talk about partitions and filesystems under Linux.

6.5. Booting the installation disk

The first step is to boot the bootdisk you generated. Normally you'll be able to boot hands-off; the boot kernel prompt will fill itself in after 10 seconds. This is how you'll normally boot from an IDE disk.

What's actually happening here is this: the boot disk provides a miniature operating system which (because the hard drive isn't prepared) uses a portion of your RAM as a virtual disk (called, logically enough, a `ramdisk').

The boot disk loads onto the ramdisk a small set of files and installation tools which you'll use to prepare your hard drive and install a production Linux on it from your CD-ROM.

(In times past this was a two-stage-process, involving a second disk called a `root disk'; this changed when kernel modules were introduced.)

By giving arguments after the kernel name, you can specify various hardware parameters, such as your SCSI controller IRQ and address, or drive geometry, before booting the Linux kernel. This may be necessary if Linux does not detect your SCSI controller or hard drive geometry, for example.

In particular, many BIOS-less SCSI controllers require you to specify the port address and IRQ at boot time. Likewise, IBM PS/1, ThinkPad, and ValuePoint machines do not store drive geometry in the CMOS, and you must specify it at boot time. (Later on, you'll be able to configure your production system to supply such parameters itself.)

Watch the messages as the system boots. They will list and describe the hardware your installation Linux detects. In particular, if you have a SCSI controller, you should see a listing of the SCSI hosts detected. If you see the message

SCSI: 0 hosts

Then your SCSI controller was not detected, and you will have to figure out how to tell the kernel where it is.

Also, the system will display information on the drive partitions and devices detected. If any of this information is incorrect or missing, you will have to force hardware detection.

On the other hand, if all goes well and your hardware seems to be detected, you can skip to the following section, ``Loading the root disk.''

To force hardware detection, you must enter the appropriate parameters at the boot prompt, using the following syntax:

linux <parameters...>

There are a number of such parameters available; we list some of the most common below. Modern Linux boot disks will often give you the option to look at help screen describing kernel parameters before you boot.

• hd=cylinders,heads,sectors Specify the drive geometry. Required for systems such as the IBM PS/1, ValuePoint, and ThinkPad. For example, if your drive has 683 cylinders, 16 heads, and 32 sectors per track, enter

  linux hd=683,16,32

  tmc8xx=memaddr,irq Specify address and IRQ for BIOS-less Future Domain TMC-8xx SCSI controller. For example,

  linux tmc8xx=0xca000,5

  Note that the 0x prefix must be used for all values given in hex. This is true for all of the following options.

• st0x=memaddr,irq Specify address and IRQ for BIOS-less Seagate ST02 controller.

• t128=memaddr,irq Specify address and IRQ for BIOS-less Trantor T128B controller.

• ncr5380=port,irq,dma Specify port, IRQ, and DMA channel for generic NCR5380 controller.

• aha152x=port,irq,scsi_id,1 Specify port, IRQ, and SCSI ID for BIOS-less AIC-6260 controllers. This includes Adaptec 1510, 152x, and Soundblaster-SCSI controllers.

If you have questions about these boot-time options, please read the Linux SCSI HOWTO, which should be available on any Linux FTP archive site (or from wherever you obtained this document). The SCSI HOWTO explains Linux SCSI compatibility in much more detail.

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6.5.2. Using fdisk and cfdisk

Your first installation step once the root-disk Linux is booted will be to create or edit the partition tables on your disks. Even if you used FDISK to set up partitions earlier, you'll need to go back to the partition table now and insert some Linux-specific information now.

To create or edit Linux partitions, we'll use the Linux version of the fdisk program, or its screen-oriented sibling cfdisk. Note that the argument to the fdisk needs to be the device corresponding to an entire disk (e.g. /dev/sda) rather than any of its partitions (such as /dev/sda1).

Generally the installation program will look for a preexisting partition table and offer to run fdisk or cfdisk on it for you. Of the two, cfdisk is definitely easier to use, but current versions of it are also less tolerant of a nonexistent or garbled partition table.

Therefore you may find (especially if you're installing on virgin hardware) that you need to start with fdisk to get to a state that cfdisk can deal with. Try running cfdisk; if it complains, run fdisk. (A good way to proceed if you're building an all-Linux system and cfdisk complains is to use fdisk to delete all the existing partions and then fire up cfdisk to edit the empty table.)

A few notes apply to both fdisk and cfdisk. Both take an argument which is the name of the drive that you wish to create Linux partitions on. Hard drive device names are:

• /dev/hda First IDE drive

• /dev/hdb Second IDE drive

• /dev/sda First SCSI drive

• /dev/sdb Second SCSI drive

For example, to create Linux partitions on the first SCSI drive in your system, you will use (or your installation program might generate from a menu choice) the command:

cfdisk /dev/sda

If you use fdisk or cfdisk without an argument, it will assume /dev/hda.

To create Linux partitions on the second drive on your system, simply specify either /dev/hdb (for IDE drives) or /dev/sdb (for SCSI drives) when running fdisk.

Your Linux partitions don't all have to be on the same drive. You might want to create your root filesystem partition on /dev/hda and your swap partition on /dev/hdb, for example. In order to do so just run fdisk or cfdisk once for each drive.

In Linux, partitions are given a name based on the drive which they belong to. For example, the first partition on the drive /dev/hda is /dev/hda1, the second is /dev/hda2, and so on. If you have any logical partitions, they are numbered starting with /dev/hda5, /dev/hda6 and so on up.

You should not create or delete partitions for operating systems other than Linux with Linux fdisk or cfdisk. That is, don't create or delete MS-DOS partitions with this version of fdisk; use MS-DOS's version of FDISK instead. If you try to create MS-DOS partitions with Linux fdisk, chances are MS-DOS will not recognize the partition and not boot correctly.

Here's an example of using fdisk. Here, we have a single MS-DOS partition using 61693 blocks on the drive, and the rest of the drive is free for Linux. (Under Linux, one block is 1024 bytes. Therefore, 61693 blocks is about 61 megabytes.) We will create just two partitions in this tutorial example, swap and root. You should probably extend this to four Linux partitions in line with the recommendations above: one for swap, one for the root filesystem, one for system software, and a home directory area.

First, we use the ``p'' command to display the current partition table. As you can see, /dev/hda1 (the first partition on /dev/hda) is a DOS partition of 61693 blocks.

Command (m for help): p Disk /dev/hda: 16 heads, 38 sectors, 683 cylinders Units = cylinders of 608 * 512 bytes Device Boot Begin Start End Blocks Id System /dev/hda1 * 1 1 203 61693 6 DOS 16-bit >=32M Command (m for help):

Next, we use the ``n'' command to create a new partition. The Linux root partition will be 80 megs in size.

Command (m for help): n Command action e extended p primary partition (1-4) p

Here we're being asked if we want to create an extended or primary partition. In most cases you want to use primary partitions, unless you need more than four partitions on a drive. See the section ``Repartitioning'', above, for more information.

Partition number (1-4): 2 First cylinder (204-683): 204 Last cylinder or +size or +sizeM or +sizeK (204-683): +80M

The first cylinder should be the cylinder AFTER where the last partition left off. In this case, /dev/hda1 ended on cylinder 203, so we start the new partition at cylinder 204.

As you can see, if we use the notation ``+80M'', it specifies a partition of 80 megs in size. Likewise, the notation ``+80K'' would specify an 80 kilobyte partition, and ``+80'' would specify just an 80 byte partition.

Warning: Linux cannot currently use 33090 sectors of this partition

If you see this warning, you can ignore it. It is left over from an old restriction that Linux filesystems could only be 64 megs in size. However, with newer filesystem types, that is no longer the case... partitions can now be up to 4 terabytes in size.

Next, we create our 10 megabyte swap partition, /dev/hda3.

Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 3 First cylinder (474-683): 474 Last cylinder or +size or +sizeM or +sizeK (474-683): +10M

Again, we display the contents of the partition table. Be sure to write down the information here, especially the size of each partition in blocks. You need this information later.

Command (m for help): p Disk /dev/hda: 16 heads, 38 sectors, 683 cylinders Units = cylinders of 608 * 512 bytes Device Boot Begin Start End Blocks Id System /dev/hda1 * 1 1 203 61693 6 DOS 16-bit >=32M /dev/hda2 204 204 473 82080 83 Linux native /dev/hda3 474 474 507 10336 83 Linux native

Note that the Linux swap partition (here, /dev/hda3) has type ``Linux native''. We need to change the type of the swap partition to ``Linux swap'' so that the installation program will recognize it as such. In order to do this, use the fdisk ``t'' command:

Command (m for help): t Partition number (1-4): 3 Hex code (type L to list codes): 82

If you use ``L'' to list the type codes, you'll find that 82 is the type corresponding to Linux swap.

To quit fdisk and save the changes to the partition table, use the ``w'' command. To quit fdisk WITHOUT saving changes, use the ``q'' command.

After quitting fdisk, the system may tell you to reboot to make sure that the changes took effect. In general there is no reason to reboot after using fdisk---modern versions of fdisk and cfdisk are smart enough to update the partitions without rebooting.

Filesystem         1024-blocks  Used Available Capacity Mounted on
/dev/sda1              30719   22337     6796     77%   /
/dev/sda3             595663  327608   237284     58%   /usr
/dev/sda4            1371370    1174  1299336      0%   /home
/dev/sdb1            1000949  643108   306130     68%   /home2

6.6. Installing software packages

Once you've gotten past preparing your partitions, the remainder of the installation should be almost automatic. Your installation program (whether EGA or X-based) will guide you through a series of menus which allow you to specify the CD-ROM to install from, the partitions to use, and so forth.

Here we're not going to document many of the specifics of this stage of installation. It's one of the parts that varies most between Linux distributions (vendors traditionally compete to add value here), but also the simplest part. And the installation programs are pretty much self-explanatory, with good on-screen help.

6.7. After package installations

After installation is complete, and if all goes well, the installation program will walk you through a few options for configuring your system before its first boot from hard drive.

8.1. Beginning System Administratration

Depending on how the installation phase went, you may need to create accounts, change your hostname, or (re)configure X at this stage. There are many more things you could set up and configure, including backup devices, SLIP/PPP links to an Internet Service Provider, etc.

A good book on UNIX systems administration should help. (I suggest Essential Systems Administration from O'Reilly and Associates.) You will pick these things up as time goes by. You should read various other Linux HOWTOs, such as the NET-3-HOWTO and Printing-HOWTO, for information on other configuration tasks.

8.2. Custom LILO Configuration

LILO is a boot loader, which can be used to select either Linux, MS-DOS, or some other operating system at boot time. Chances are your distribution automatically configured LILO for you during the installation phase (unless you're using OS/2, this is what you should have done). If so, you can skip the rest of this section.

If you installed LILO as the primary boot loader, it will handle the first-stage booting process for all operating systems on your drive. This works well if MS-DOS is the only other operating system that you have installed. However, you might be running OS/2, which has its own Boot Manager. In this case, you want OS/2's Boot Manager to be the primary boot loader, and use LILO just to boot Linux (as the secondary boot loader).

An important gotcha for people using EIDE systems: due to a BIOS limitation, your boot sectors for any OS have to live on one of the first two physical disks. Otherwise LILO will hang after writing "LI", no matter where you run it from.

If you have to configure LILO manually, this will involve editing the file /etc/lilo.conf. Below we present an example of a LILO configuration file, where the Linux root partition is on /dev/hda2, and MS-DOS is installed on /dev/hdb1 (on the second hard drive).

# Tell LILO to install itself as the primary boot loader on /dev/hda.
boot = /dev/hda
# The boot image to install; you probably shouldn't change this
install = /boot/boot.b

# The stanza for booting Linux. 
image = /vmlinuz       # The kernel is in /vmlinuz
  label = linux        # Give it the name "linux"
  root = /dev/hda2     # Use /dev/hda2 as the root filesystem
  vga = ask            # Prompt for VGA mode
  append = "aha152x=0x340,11,7,1"  # Add this to the boot options,
   # for detecting the SCSI controller

# The stanza for booting MS-DOS
other = /dev/hdb1      # This is the MS-DOS partition
  label = msdos        # Give it the name "msdos"
  table = /dev/hdb     # The partition table for the second drive

Once you have edited the /etc/lilo.conf file, run /sbin/lilo as root. This will install LILO on your drive. Note that you must rerun /sbin/lilo anytime that you recompile your kernel in order to point the boot loader at it properly (something that you don't need to worry about just now, but keep it in mind).

Note how we use the append option in /etc/lilo.conf to specify boot parameters as we did when booting the bootdisk.

You can now reboot your system from the hard drive. By default LILO will boot the operating system listed first in the configuration file, which in this case is Linux. In order to bring up a boot menu, in order to select another operating system, hold down shift or ctrl while the system boots; you should see a prompt such as

Boot:

Here, enter either the name of the operating system to boot (given by the label line in the configuration file; in this case, either linux or msdos), or press tab to get a list.

Now let's say that you want to use LILO as the secondary boot loader; if you want to boot Linux from OS/2's Boot Manager, for example. In order to boot a Linux partition from OS/2 Boot Manager, unfortunately, you must create the partition using OS/2's FDISK (not Linux's), and format the partition as FAT or HPFS, so that OS/2 knows about it. (That's IBM for you.)

In order to have LILO boot Linux from OS/2 Boot Manager, you only want to install LILO on your Linux root filesystem (in the above example, /dev/hda2). In this case, your LILO config file should look something like:

boot = /dev/hda2
install = /boot/boot.b
compact

image = /vmlinuz
  label = linux
  root = /dev/hda2
  vga = ask

Note the change in the boot line. After running /sbin/lilo you should be able to add the Linux partition to Boot Manager. This mechanism should work for boot loaders used by other operating systems as well.

9.1. Terms of Use

This document is copyright 1998 by Eric S. Raymond. You may use, disseminate, and reproduce it freely, provided you:

• Do not omit or alter this copyright notice (you may translate it)

• Do not omit or alter or omit the version number and date.

• Do not omit or alter the document's pointer to the current WWW version.

• Clearly mark any condensed, or altered versions as such.

These restrictions are intended to protect potential readers from stale or mangled versions. If you think you have a good case for an exception, ask me.

9.2. Acknowledgements

My grateful acknowledgement to Matt D. Welsh, who originated this HOWTO. I removed much of the Slackware-specific content and refocused the remainder of the document on CD-ROM installation, but a substantial part of the content is still his.

The 4.1 version was substantially improved by some suggestions from David Shao <dshao@best.com>.