mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-31 16:21:11 +03:00
69 lines
3.3 KiB
Plaintext
69 lines
3.3 KiB
Plaintext
|
Troubleshooting udev for dev on Red Hat distro
|
||
|
|
|
||
|
|
1) Make sure you have a rescue disk/cd in case you hose your machine. You've
|
||
|
|
been forewarned.
|
||
|
|
2) Grab latest udev tarball or clone udev bitkeeper tree
|
||
|
|
(bk://linuxusb.bkbits.net.udev)
|
||
|
|
3) Follow README and HOWTO-udev_for_dev documents
|
||
|
|
|
||
|
|
The following is some additional help to get udev for dev up and running on RH.
|
||
|
|
|
||
|
|
Q. I login as my normal self from the login screen and RH just hangs on an
|
||
|
|
empty blue screen. What's wrong?
|
||
|
|
|
||
|
|
A. You have some wrong permissions. I'm guessing you can probably log in as root
|
||
|
|
but not as your normal user. Basically you need to edit the
|
||
|
|
/etc/udev/udev.permissions file to set the correct permissions to the nodes
|
||
|
|
in /dev. I added the following:
|
||
|
|
|
||
|
|
null:root:users:0666
|
||
|
|
urandom:root:users:0644
|
||
|
|
|
||
|
|
setting the correct permissions to null and urandom allowed me to login
|
||
|
|
as myself and not at root.
|
||
|
|
|
||
|
|
While you are there you might want to set the permissions to ptmx as well
|
||
|
|
or you may have trouble getting a bash prompt in an xterm. i.e.
|
||
|
|
ptmx:root:users:0666 Also refer to the next question.
|
||
|
|
|
||
|
|
Q. I'm having trouble getting a bash prompt from my xterm. i.e. I bring up a
|
||
|
|
terminal and all I have is a blank screen with a blinking cursor.
|
||
|
|
|
||
|
|
A. First make sure you have the correct permissions set for ptmx. See above
|
||
|
|
Q&A for help on this. But I'm guessing that something is wrong with your
|
||
|
|
/dev/pts, thanks Captain Obvious, heh:) You probably have devpts mounted
|
||
|
|
to /dev/pts from /etc/fstab. I'm also guessing that you have sysfs mounted
|
||
|
|
to /sys from /etc/fstab as well. If this is the case then the line in
|
||
|
|
/etc/rc.sysinit
|
||
|
|
|
||
|
|
action $"Mounting local filesystems:" mount -a -t nonfs,smbfs,ncpfs -O no_netdev
|
||
|
|
|
||
|
|
will have mounted these for you. As a result you placed your call to
|
||
|
|
start_udev directly after this because the HOWTO-udev_for_dev document
|
||
|
|
told you to insert start_udev after /proc and /sys have been mounted.
|
||
|
|
Well start_udev actually overwrites /dev thus anything you had mounted in
|
||
|
|
/dev prior to start_udev being called will be blown away. So basically,
|
||
|
|
you mounted devpts to /dev/pts because everything in /etc/fstab was mounted
|
||
|
|
and then it was blown away by calling start_udev. A simple fix is to remove
|
||
|
|
the mount devpts line from /etc/fstab and mount it after calling start_udev.
|
||
|
|
I did the following:
|
||
|
|
|
||
|
|
action $"Mounting local filesystems:" mount -a -t nonfs,smbfs,ncpfs -O no_netdev
|
||
|
|
/etc/rc.d/start_udev
|
||
|
|
action $"Mounting devpts: " mount -t devpts none /dev/pts
|
||
|
|
|
||
|
|
After doing so I rebooted and was able to get my prompt from my xterm.
|
||
|
|
|
||
|
|
Q. I'm getting some error messages during boot. How do I get rid of them?
|
||
|
|
|
||
|
|
A. For me it was a matter of setting up Symlinks. Basically, some /dev entries
|
||
|
|
were being looked for and not being found so an error was thrown. For example,
|
||
|
|
/dev/cdrom was needed but udev had named it /dev/hdc by default. Basically I
|
||
|
|
edited my /etc/udev/udev.rules file to create a symlink from /dev/cdrom to
|
||
|
|
/dev/hdc and my error went away.
|
||
|
|
|
||
|
|
These are some of the things I ran into. NOTE: I hosed my machine more than once
|
||
|
|
trying to figure this out and a rescue disk was my best friend. If you have any
|
||
|
|
other experiences and would like to add to this Q&A list feel free to send me a
|
||
|
|
patch (ogasawara@osdl.org). Hopefully this helped someone. Thanks.
|