udev in initrd

There are new FC3 test packages for udev usage in initrd: http://people.redhat.com/twoerner/UDEV/FC3/ This is a minimal version without udev-persistent support and no busybox. It is using the normal nash initrd environment. U S A G E ========= - Install initscripts, mkinitrd and udev updates - To use udev in initrd, set USE_UDEV and UDEV_INITRD in /etc/sysconfig/udev. udev will then use the normal /dev directory and will generate devices in there. - udev can be started in a clean mounted ramfs on /dev by setting UDEV_RAMFS - To get this ramfs /dev to your system, set UDEV_KEEP_DEV. Setting UDEV_KEEP_DEV also sets UDEV_RAMFS. /dev will be bind-mounted to your root directory, then. - Unset udev_owner in /etc/udev/udev.conf to get normal persimissions. Newer udev packages are not setting device ownerships or permissions, if the device already exists. But this is needed if you are keeping your /dev, because udev will generate devices with root ownership (there is no other user in initrd) and udevstart in rc.sysinit will not set correct permissions, then. - Setting udev_remove will remove devices if the corresponding hardware device is gone e.g. for USB devices. E X A M P L E C O N F I G U R A T I O N ========================================= /etc/sysconfig/udev ------------------- ... USE_UDEV="yes" UDEV_INITRD="yes" UDEV_RAMFS="yes" UDEV_KEEP_DEV="yes" /etc/udev/udev.conf ------------------- ... udev_owner="no" udev_remove="yes" W A R N I N G ============= Do not overwrite your initrd images and make new grub entries, to have a sane fallback. Please be careful if you are using LVM or RAID. These are not tested, yet. Thomas