[ << ] [ < ] [ Home ] [ > ] [ >> ] 2. Choosing the Right Installation MediumContent:Before we start, we first list what hardware requirements you need to successfully install Gentoo on your box. This of course depends on your architecture. Check the following requirements before you continue with the Gentoo installation:
Still interested in trying out Gentoo? Well, then it is now time to choose the installation medium you want to use. Yes, you have the choice, no, they are not all equal, and yes, the result is always the same: a Gentoo base system. The installation media we will describe are:
Every single media has its advantages and disadvantages. We will list the pros and cons of every medium so you have all the information to make a justified decision. But before we continue, let's explain our three-stage installation. Gentoo Linux can be installed using one of three stage tarball files. The one you choose depends on how much of the system you want to compile yourself. The stage1 tarball is used when you want to bootstrap and build the entire system from scratch. The stage2 tarball is used for building the entire system from a bootstrapped "semi-compiled" state. The stage3 tarball already contains a basic Gentoo Linux system that has been built for you. As we will explain later, you can also install Gentoo without compiling anything (except your kernel and some optional packages). If you want this, you have to use a stage3 tarball. Now what stage do you have to choose? Starting from a stage1 allows you to have total control over the optimization settings and optional build-time functionality that is initially enabled on your system. This makes stage1 installs good for power users who know what they are doing. It is also a great installation method for those who would like to know more about the inner workings of Gentoo Linux. A stage1 installation can only be performed when you have a working Internet connection.
Stage2 installs allow you to skip the bootstrap process and doing this is fine if you are happy with the optimization settings that we chose for your particular stage2 tarball. A stage2 installation can only be performed when you have a working Internet connection.
Choosing to go with a stage3 allows for the fastest install of Gentoo Linux, but also means that your base system will have the optimization settings that we chose for you (which to be honest, are good settings and were carefully chosen to enhance performance while maintaining stability). stage3 is also required if you want to install Gentoo using prebuilt packages or without a network connection.
Write down (or remember) what stage you want to use. You need this later when you decide what LiveCD (or other installation medium) you want to use. You might be interested to know that, if you decide to use different optimization settings after having installed Gentoo, you will be able to recompile your entire system with the new optimization settings. Now take a look at the available installation media. The Gentoo LiveCDs are bootable CDs which contain a self-sustained Gentoo environment. They allow you to boot Linux from the CD. During the boot process your hardware is detected and the appropriate drivers are loaded. They are maintained by Gentoo developers. All LiveCDs allow you to boot, set up networking, initialize your partitions and start installing Gentoo from the Internet. However, some LiveCDs also contain all necessary source code so you are able to install Gentoo without a working network configuration. Now what do these LiveCDs contain? This is a small, no-nonsense, bootable CD which sole purpose is to boot the system, prepare the networking and continue with the Gentoo installation. It does not contain any stages (or, in some cases, a single stage1 file), source code or precompiled packages. For example the amd64 variant of this LiveCD can be found in the releases/amd64/2004.1/livecd directory and is called install-amd64-minimal-2004.1.iso.
Gentoo's Universal LiveCD is a bootable CD suitable to install Gentoo without networking. It contains a stage1 and a stage3 tarball (optimized for AMD64). For example the amd64 variant of this CD is called install-amd64-universal-2004.1.iso and can be found in the releases/amd64/2004.1/livecd subdirectory. If you take a closer look on our mirrors you will see that we also provide a Gentoo Package CD. This CD (which isn't bootable) only contains precompiled packages and can be used to install software after a succesfull Gentoo Installation. To install Gentoo, you only need the Universal LiveCD, but if you want OpenOffice.org, Mozilla, KDE, GNOME etc. without having to compile every single one of them, you need the Packages CD too. The AMD64 Packages CD is called packages-amd64-2004.1.iso. You only need the Packages CD if you want to perform a stage3 with GRP installation.
2.c. Download, Burn and Boot a Gentoo LiveCD Downloading and Burning the LiveCDs You have chosen to use a Gentoo LiveCD (if not, then you are reading the wrong section). We'll first start by downloading and burning the chosen LiveCD. We previously discussed the several available LiveCDs, but where can you find them? Go to the main Gentoo directory on any of our mirrors. You will find the Gentoo LiveCDs in the releases/amd64/2004.1/livecd directory. Inside that directory you'll find so-called ISO-files. Those are full CD images which you can write on a CD-R. In case you wonder if your downloaded file is corrupted or not, you can check its MD5 checksum and compare it with the MD5 checksum we provide (such as install-amd64-minimal-2004.1.iso.md5). You can check the MD5 checksum with the md5sum tool under Linux/Unix or md5sum for Windows. Another way to check the validity of the downloaded file is to use GnuPG to verify the cryptographic signature that we provide (the file ending with .asc). Download the signature file and obtain the public key:
Now verify the signature:
To burn the downloaded ISO(s), you have to select raw-burning. How you do this is highly program-dependent. We will discuss cdrecord and K3B here; more information can be found in our Gentoo FAQ.
Once you have burned your installation CDs, it is time to boot them. Remove all CDs from the CD drives, reboot your system and enter the BIOS. This is usually done by hitting DEL, F1 or ESC, depending on your BIOS. Inside the BIOS, change the boot order so that the CD-ROM is tried before the hard disk. This is often found under "CMOS Setup". If you don't do this, your system will just reboot from the hard disk, ignoring the CD-ROM. Now place the installation CD in the CD-ROM drive (duh) and reboot. You should see a fancy boot screen with the Gentoo Linux logo on it. At this screen, you can hit Enter to begin the boot process with the default boot options, or boot the LiveCD with custom boot options by specifying a kernel followed by boot options and then hitting Enter. Specifying a kernel? Yes, we provide several kernels on our LiveCDs. The default one is gentoo. Other kernels are smp, which activates support for multi-cpu systems and the -nofb variants which disable framebuffer. We also provide emachines for emachines m6805/7 laptops. Below you'll find a short overview on the available kernels:
You can also provide kernel options. They represent optional settings you can (de)activate at will. The following code listing explains all available kernel options.
Now boot your CD, select a kernel (if you are not happy with the default gentoo kernel) and boot options. As an example, we show you how to boot the gentoo kernel, with dopcmcia as kernel parameters:
You will then be greeted with another boot screen and progress bar. Once the boot process completes, you will be automatically logged in to the "Live" Gentoo Linux as "root", the super user. You should have a root ("#") prompt on the current console and can also switch to other consoles by pressing Alt-F2, Alt-F3 and Alt-F4. Get back to the one you started on by pressing Alt-F1. If you are installing Gentoo on a system with a non-US keyboard, use loadkeys to load the keymap for your keyboard. To list the available keymaps, execute ls /usr/share/keymaps.
Now load the keymap of your choice:
Now continue with Extra Hardware Configuration. When the Live CD boots, it tries to detect all your hardware devices and loads the appropriate kernel modules to support your hardware. In the vast majority of cases, it does a very good job. However, in some cases (the SPARC LiveCDs don't even do autodetection), it may not auto-load the kernel modules you need. If the PCI auto-detection missed some of your system's hardware, you will have to load the appropriate kernel modules manually. In the next example we try to load the 8139too module (support for certain kinds of network interfaces):
Optional: Tweaking Hard Disk Performance If you are an advanced user, you might want to tweak the IDE hard disk performance using hdparm. With the -tT options you can test the performance of your disk (execute it several times to get a more precise impression):
To tweak, you can use any of the following examples (or experiment yourself) which use /dev/hda as disk (substitute with your disk):
If you plan on giving other people access to your installation environment or you want to chat using irssi without root privileges (for security reasons), you need to create the necessary user accounts and change the root password. To change the root password, use the passwd utility:
To create a user account, we first enter their credentials, followed by its password. We use useradd and passwd for these tasks. In the next example, we create a user called "john".
You can change your user id from root to the newly created user by using su:
Optional: Viewing Documentation while Installing If you want to view the Gentoo Handbook (either from-CD or online) during the installation, make sure you have created a user account (see Optional: User Accounts). Then press Alt-F2 to go to a new terminal and log in. If you want to view the documentation on the CD you can immediately run links2 to read it:
However, it is preferred that you use the online Gentoo Handbook as it will be more recent than the one provided on the CD. You can view it using links2 as well, but only after having completed the Configuring your Network chapter (otherwise you won't be able to go on the Internet to view the document):
You can go back to your original terminal by pressing Alt-F1. Optional: Starting the SSH Daemon If you want to allow other users to access your computer during the Gentoo installation (perhaps because those users are going to help you install Gentoo, or even do it for you), you need to create a user account for them and perhaps even provide them with your root password (only do that if you fully trust that user). To fire up the SSH daemon, execute the following command:
To be able to use sshd, you first need to set up your networking. Continue with the chapter on Configuring your Network. [ << ] [ < ] [ Home ] [ > ] [ >> ] The contents of this document, unless otherwise expressly stated, are licensed under the CC-BY-SA-2.5 license. The Gentoo Name and Logo Usage Guidelines apply. |
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