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author | Jeremy Katz <katzj@redhat.com> | 2002-04-19 04:03:26 +0000 |
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committer | Jeremy Katz <katzj@redhat.com> | 2002-04-19 04:03:26 +0000 |
commit | 34e94e67312be97452e79939ae7104afae3c041b (patch) | |
tree | 8d20622fb803780206af9d563ed26e4bec11650e /docs/anaconda-release-notes.txt | |
parent | 0b78cc84fbf808102dbf509000e9ef2b848c4f88 (diff) | |
download | anaconda-34e94e67312be97452e79939ae7104afae3c041b.tar.gz anaconda-34e94e67312be97452e79939ae7104afae3c041b.tar.xz anaconda-34e94e67312be97452e79939ae7104afae3c041b.zip |
more easy merging from hampton branch
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-rw-r--r-- | docs/anaconda-release-notes.txt | 201 |
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diff --git a/docs/anaconda-release-notes.txt b/docs/anaconda-release-notes.txt new file mode 100644 index 000000000..5ace02bce --- /dev/null +++ b/docs/anaconda-release-notes.txt @@ -0,0 +1,201 @@ +Anaconda Release Notes +---------------------- + +Last update: Mar 26 2002 + + +Contents + + - Overview + - Install mechanism summary + - Patching/updating installer + - Invocation options + - Troubleshooting + - More info + + +Overview +-------- + + Anaconda is the name of the install program used by Red Hat Linux. +It is python-based with some custom modules written in C. Being +written in a scripting language makes development quicker, and it is +easier to distribute updates in a non-binary form. The anaconda +installer works on a wide variety of Linux-based computing +architectures (ia32, Itanium, Alpha, S/390, PowerPC), and is designed to make +it easy to add platforms. + + The first stage of the installer is a loader program written in C. +This program is responsible for loading all the kernel modules +required to mount the second stage of the installer, which has a +fairly complete Linux runtime environment. The loader is designed to +be small to fit within the constraints of bootable media (floppies are +small by modern standards). Once the loader has mounted the second +stage image, the python installer is started up, and optionally, a +graphical X Windows based environment. + + The loader can install from local media (harddrive or CDROM), or +from a network source, via FTP, HTTP, or NFS. The installer can pull +updates for bugs or features via several sources as well. Finally, the +installer has an auto-install mechanism called kickstart that allows +installs to be scripted. The script can even be pulls from an HTTP +source that can create kickstart configurations dynamically based on +the machine which is requesting the script. This allows endless +possibilities in automating large sets of servers. + + This document's purpose is to go over technical details that will +make using and customizing the installer, and the distribution, much +easier. The anaconda installer arguably is one of the most flexible +and powerful installers available, and hopefully this document will +allow users to take advantage of this potential. + +Install Mechanism Summary +------------------------- + + The document 'install-methods.txt', which is distributed with the +anaconda package, goes over the various ways the installer can be +used. Essentially, the installer needs to access the contents of the +CD images distributed with the product. The installer can either work +with the CD images one at a time, or else from a single directory (the +install 'tree') which has the contents of all the CD images copied +into it. The later is useful if you are customizing the packages in +the distribution. The first stage of the installation process (the +'loader') is responsible for getting the system to the point it can +access the installation source, whether CD image or installation tree based. + + For CDROM-based installs the loader detects the presence of a CD in a +drive in the system with a distribution on it and jumps straight to the +second stage. For other interactive (non-kickstart) installation methods the +user is prompted for the installation source. For kickstart-based installs +the installation source is specified in the kickstart file, and the user is +not required to be present unless necessary information is missing from the +kickstart script. + + For NFS-based installs the installer mounts the directory specified +and looks for a set of ISO images, or an installation tree. If +present then a filesystem image is loopback-mounted and the second +stage installer is run from this image. For FTP and HTTP installs a +smaller (no graphical install options) second stage image is +downloaded into memory, mounted, and the second stage installer run +from this. On harddrive based installs a similar small second stage +image is put into memory and the second stage installer run from it. +This is necessary because for partitioning to suceed the installer can +not have partitions on the harddrive mounted in order for the kernel +to be able to acknowledge partition table changes. + + The bootable installation images are as follow: + + boot.img - boot image containing kernel modules for installing + on most systems from a CDROM or harddrive. + + bootnet.img - boot iamge containing kernel modules for + installing on most systems from a network source. + + pcmcia.img - boot image for installing on PCMCIA based systems + from a local or network source. + Requires pcmciadd.img driver disk. + + The supplemental driver disk images are: + + drvblock.img - block device drivers (for example, SCSI controllers). + + drvnet.img - extra network device drivers. + + oldcdrom.img - device drivers for non-SCSI, non-ATAPI cdroms. + + +Patching The Installer +---------------------- + + At times there are bugfixes or feature enhancements available for +the installer. These are typically replacement python source files +which override the versions distributed with the release. Python has +a mechanism similar to the command line shell search path for +executables. The installer can be updated by putting patched files in +a location earlier in the search path Python uses to find modules. +The 'install-methods.txt' document describes all the various ways the +installer can be told where to find the updating source files. +Typcially this is done from an 'update disk', which is a floppy with +an ext2 filesytem on it. The updated python source files are put in +the main directory of the floppy. The installer is invoked with an +'updates' option from the boot command line, and the user is prompted +to insert the update disk. The files are copied off into a ramdisk +location which Python has been instructed to look at first of modules. +For NFS installes, any files in the directory 'RHupdates' under the +directory mounted in the loader will also be used before the source +files shipped in the release. If one is customizing the distribution +and the installer then installing over NFS is the fastest way to work. + + The installer will also use an 'updates.img' file to get patched +source files. This is particularly useful for FTP and HTTP based installs. +When the second stage image is retrieved from the server, a download of +the updates.img is also attempted. This file must be an ext2 filesystem image. +It is mounted loopback, then the contents are copied to the ramdisk location +that Python is setup to look at for module updates. This update image will +also work with all the other installation mechanisms, although the exact +location where it is expected does vary. The 'install-methods.txt' file +has the details on this. + +Invocation Options +------------------ + The documentation file 'command-line.txt' has a quick summary of all the +command line options anaconda accepts. + +Troubleshooting +--------------- + +- Cannot get graphical installer working + + On some video hardware (laptops in particular) the graphical + installer will not work. The installer attempts to run at + 800x600, and some hardware does not work in this mode, or the + output looks poor when scaled to this mode. This can be worked + around by specifying the 'vga=xxx' option on the command line when + booting the installer. Here 'xxx' is the VESA mode number for the + video mode which will work on your hardware, and can be one of the + following: + + + | 640x480 800x600 1024x768 1280x1024 <-Resolution + ----+------------------------------------- + 256 | 769 771 773 775 + 32k | 784 787 790 793 + 64k | 785 788 791 794 + 16M | 786 789 792 795 + ^ + | + Number of colors + + Find the row with the number of colors and the column with the resolution + and then use the number at the intersection. For example, to run at + 1024x768 with 64k colors, use 'vga=791' + + Alternately, you can specify "resolution=<mode>", where mode is: + + 640x480 + 800x600 + 1024x768 + 1152x864 + 1280x1024 + 1400x1050 + 1600x1200 + + and the installer will start up in graphical mode in the resolution + specified. + + + +More Info +--------- + + For more info, goto the kickstart-list and anaconda-devel mailing lists +hosted by Red Hat. You can find these at: + + + anaconda-devel-list - + https://listman.redhat.com/mailman/listinfo/anaconda-devel-list + + kickstart-list - + https://listman.redhat.com/mailman/listinfo/kickstart-list + +<end of document> |