Intro ===== This document is designed to provide a list of the minimum levels of software necessary to run the 2.6 kernels, as well as provide brief instructions regarding any other "Gotchas" users may encounter when trying life on the Bleeding Edge. If upgrading from a pre-2.4.x kernel, please consult the Changes file included with 2.4.x kernels for additional information; most of that information will not be repeated here. Basically, this document assumes that your system is already functional and running at least 2.4.x kernels. This document is originally based on my "Changes" file for 2.0.x kernels and therefore owes credit to the same people as that file (Jared Mauch, Axel Boldt, Alessandro Sigala, and countless other users all over the 'net). Current Minimal Requirements ============================ Upgrade to at *least* these software revisions before thinking you've encountered a bug! If you're unsure what version you're currently running, the suggested command should tell you. Again, keep in mind that this list assumes you are already functionally running a Linux 2.4 kernel. Also, not all tools are necessary on all systems; obviously, if you don't have any ISDN hardware, for example, you probably needn't concern yourself with isdn4k-utils. o Gnu C 3.2 # gcc --version o Gnu make 3.79.1 # make --version o binutils 2.12 # ld -v o util-linux 2.10o # fdformat --version o module-init-tools 0.9.10 # depmod -V o e2fsprogs 1.29 # tune2fs o jfsutils 1.1.3 # fsck.jfs -V o reiserfsprogs 3.6.3 # reiserfsck -V 2>&1|grep reiserfsprogs o xfsprogs 2.6.0 # xfs_db -V o pcmciautils 004 o pcmcia-cs 3.1.21 # cardmgr -V o quota-tools 3.09 # quota -V o PPP 2.4.0 # pppd --version o isdn4k-utils 3.1pre1 # isdnctrl 2>&1|grep version o nfs-utils 1.0.5 # showmount --version o procps 3.2.0 # ps --version o oprofile 0.9 # oprofiled --version o udev 071 # udevinfo -V Kernel compilation ================== GCC --- The gcc version requirements may vary depending on the type of CPU in your computer. Make ---- You will need Gnu make 3.79.1 or later to build the kernel. Binutils -------- Linux on IA-32 has recently switched from using as86 to using gas for assembling the 16-bit boot code, removing the need for as86 to compile your kernel. This change does, however, mean that you need a recent release of binutils. System utilities ================ Architectural changes --------------------- DevFS has been obsoleted in favour of udev (http://www.kernel.org/pub/linux/utils/kernel/hotplug/) 32-bit UID support is now in place. Have fun! Linux documentation for functions is transitioning to inline documentation via specially-formatted comments near their definitions in the source. These comments can be combined with the SGML templates in the Documentation/DocBook directory to make DocBook files, which can then be converted by DocBook stylesheets to PostScript, HTML, PDF files, and several other formats. In order to convert from DocBook format to a format of your choice, you'll need to install Jade as well as the desired DocBook stylesheets. Util-linux ---------- New versions of util-linux provide *fdisk support for larger disks, support new options to mount, recognize more supported partition types, have a fdformat which works with 2.4 kernels, and similar goodies. You'll probably want to upgrade. Ksymoops -------- If the unthinkable happens and your kernel oopses, you may need the ksymoops tool to decode it, but in most cases you don't. In the 2.6 kernel it is generally preferred to build the kernel with CONFIG_KALLSYMS so that it produces readable dumps that can be used as-is (this also produces better output than ksymoops). If for some reason your kernel is not build with CONFIG_KALLSYMS and you have no way to rebuild and reproduce the Oops with that option, then you can still decode that Oops with ksymoops. Module-Init-Tools ----------------- A new module loader is now in the kernel that requires module-init-tools to use. It is backward compatible with the 2.4.x series kernels. Mkinitrd -------- These changes to the /lib/modules file tree layout also require that mkinitrd be upgraded. E2fsprogs --------- The latest version of e2fsprogs fixes several bugs in fsck and debugfs. Obviously, it's a good idea to upgrade. JFSutils -------- The jfsutils package contains the utilities for the file system. The following utilities are available: o fsck.jfs - initiate replay of the transaction log, and check and repair a JFS formatted partition. o mkfs.jfs - create a JFS formatted partition. o other file system utilities are also available in this package. Reiserfsprogs ------------- The reiserfsprogs package should be used for reiserfs-3.6.x (Linux kernels 2.4.x). It is a combined package and contains working versions of mkreiserfs, resize_reiserfs, debugreiserfs and reiserfsck. These utils work on both i386 and alpha platforms. Xfsprogs -------- The latest version of xfsprogs contains mkfs.xfs, xfs_db, and the xfs_repair utilities, among others, for the XFS filesystem. It is architecture independent and any version from 2.0.0 onward should work correctly with this version of the XFS kernel code (2.6.0 or later is recommended, due to some significant improvements). PCMCIAutils ----------- PCMCIAutils replaces pcmcia-cs (see below). It properly sets up PCMCIA sockets at system startup and loads the appropriate modules for 16-bit PCMCIA devices if the kernel is modularized and the hotplug subsystem is used. Pcmcia-cs --------- PCMCIA (PC Card) support is now partially implemented in the main kernel source. The "pcmciautils" package (see above) replaces pcmcia-cs for newest kernels. Quota-tools ----------- Support for 32 bit uid's and gid's is required if you want to use the newer version 2 quota format. Quota-tools version 3.07 and newer has this support. Use the recommended version or newer from the table above. Intel IA32 microcode -------------------- A driver has been added to allow updating of Intel IA32 microcode, accessible as both a devfs regular file and as a normal (misc) character device. If you are not using devfs you may need to: mkdir /dev/cpu mknod /dev/cpu/microcode c 10 184 chmod 0644 /dev/cpu/microcode as root before you can use this. You'll probably also want to get the user-space microcode_ctl utility to use with this. Powertweak ---------- If you are running v0.1.17 or earlier, you should upgrade to version v0.99.0 or higher. Running old versions may cause problems with programs using shared memory. udev ---- udev is a userspace application for populating /dev dynamically with only entries for devices actually present. udev replaces devfs. FUSE ---- Needs libfuse 2.4.0 or later. Absolute minimum is 2.3.0 but mount options 'direct_io' and 'kernel_cache' won't work. Networking ========== General changes --------------- If you have advanced network configuration needs, you should probably consider using the network tools from ip-route2. Packet Filter / NAT ------------------- The packet filtering and NAT code uses the same tools like the previous 2.4.x kernel series (iptables). It still includes backwards-compatibility modules for 2.2.x-style ipchains and 2.0.x-style ipfwadm. PPP --- The PPP driver has been restructured to support multilink and to enable it to operate over diverse media layers. If you use PPP, upgrade pppd to at least 2.4.0. If you are not using devfs, you must have the device file /dev/ppp which can be made by: mknod /dev/ppp c 108 0 as root. If you use devfsd and build ppp support as modules, you will need the following in your /etc/devfsd.conf file: LOOKUP PPP MODLOAD Isdn4k-utils ------------ Due to changes in the length of the phone number field, isdn4k-utils needs to be recompiled or (preferably) upgraded. NFS-utils --------- In 2.4 and earlier kernels, the nfs server needed to know about any client that expected to be able to access files via NFS. This information would be given to the kernel by "mountd" when the client mounted the filesystem, or by "exportfs" at system startup. exportfs would take information about active clients from /var/lib/nfs/rmtab. This approach is quite fragile as it depends on rmtab being correct which is not always easy, particularly when trying to implement fail-over. Even when the system is working well, rmtab suffers from getting lots of old entries that never get removed. With 2.6 we have the option of having the kernel tell mountd when it gets a request from an unknown host, and mountd can give appropriate export information to the kernel. This removes the dependency on rmtab and means that the kernel only needs to know about currently active clients. To enable this new functionality, you need to: mount -t nfsd nfsd /proc/fs/nfs before running exportfs or mountd. It is recommended that all NFS services be protected from the internet-at-large by a firewall where that is possible. Getting updated software ======================== Kernel compilation ****************** gcc --- o Make ---- o Binutils -------- o System utilities **************** Util-linux ---------- o Ksymoops -------- o Module-Init-Tools ----------------- o Mkinitrd -------- o E2fsprogs --------- o JFSutils -------- o Reiserfsprogs ------------- o Xfsprogs -------- o Pcmciautils ----------- o Pcmcia-cs --------- o Quota-tools ---------- o DocBook Stylesheets ------------------- o XMLTO XSLT Frontend ------------------- o Intel P6 microcode ------------------ o Powertweak ---------- o udev ---- o FUSE ---- o Networking ********** PPP --- o Isdn4k-utils ------------ o NFS-utils --------- o Iptables -------- o Ip-route2 --------- o OProfile -------- o NFS-Utils --------- o