11-03-2008
FreeBSD - Kernel Queries/Issues
All,
I am a bit of a BSD newbie and haven't really played with it for years, but I have had a recent situation whereby someone attempted to load a custom kernel module and ended up breaking my BSD server.
I managed to fix it by doing the following:
Booting into loader mode:
unload
set kernel="kernel.old"
boot-conf
When I do this the server boots fine and I have a working kernel as follows:
bash-2.05b# uname -a
FreeBSD mrslim 5.4-RELEASE FreeBSD 5.4-RELEASE #2: Fri Oct 31 15:51:10 GMT 2008 root@mrslim:/usr/obj/usr/src/sys/SMP i386
Here are the avaliable kernels:
bash-2.05b# cd /usr/src/sys/i386/conf/
bash-2.05b# ls -al
total 82
drwxr-xr-x 2 root wheel 512 Oct 31 14:55 .
drwxr-xr-x 13 root wheel 512 Jun 21 2005 ..
-rwxr-xr-x 1 root wheel 10005 Oct 31 16:13 GENERIC
-rwxr-xr-x 1 root wheel 1982 Apr 1 2004 GENERIC.hints
-rwxr-xr-x 1 root wheel 9966 Jun 21 2005 KERNEL-MOD1
-rwxr-xr-x 1 root wheel 120 Feb 26 2003 Makefile
-rwxr-xr-x 1 root wheel 33699 May 1 2005 NOTES
-rwxr-xr-x 1 root wheel 469 Jul 13 2004 OLDCARD
-rwxr-xr-x 1 root wheel 1754 Apr 30 2005 PAE
-rwxr-xr-x 1 root wheel 322 Feb 6 2005 SMP
-rwxr-xr-x 1 root wheel 9986 Oct 31 14:59 TOMHKERNEL
I have attempted to complie GENERIC, which seemed to work successfully.
make buildkernel KERNCONF=MYKERNEL
make installkernel KERNCONF=MYKERNEL
When the server is rebooted, none of the network cards are avaliable, the only way round this problem is to go into the loader and do what I mentioned above. I have troubleshooted the network setup and everything is fine, although I can't ping the default gateway, but I am convinced this is caused by my friend not installing his custom module correctly, as everything work perfectly with the current loaded kernel.
Can anyone tell me how I can resolve this issue? It seems I just need the current loaded kernel to be made as the default. I want to be able to restart the server and not have to worry about this failing over and over.. I just want my working setup to be restored permanently!
Thanks in advance.
-D
10 More Discussions You Might Find Interesting
1. UNIX Desktop Questions & Answers
question:
i just installed FreeBSD 4.7 on my laptop, when i log in as root, i can startx no problem at all but when i try to start it as a user, i can't. otiginally it told me i needed to be a member of the group 'wheel' to do startx, no problem, added myself in /etc/group, but for some reason i... (1 Reply)
Discussion started by: Calum
1 Replies
2. UNIX for Advanced & Expert Users
i'm following the, "How to setup and secure Snort, MySQL and Acid on FreeBSD 4.6 Release" off of the snort.org website.
in the documentation it says snort should be installed through the following:
-----
make -DWITH_MYSQL -DWITH_FLEXRESP ; make install
-----
later it says to do the... (13 Replies)
Discussion started by: xyyz
13 Replies
3. UNIX for Dummies Questions & Answers
I have been using Linux for 3 years now, and I think I am getting enough knowledge (and confidence) to try some more 'traditional' unix variants. I installed FreeBSD 5.0-CURRENT. I have a couple of questions for the time being:
1) Frequently when I need to compile software packages they can't... (16 Replies)
Discussion started by: cbkihong
16 Replies
4. BSD
Does anyone know how to enter the Kernel Configuration program in FreeBSD before installation to resolve conflicts of hardware?:confused: (3 Replies)
Discussion started by: Enoch Chan
3 Replies
5. UNIX for Dummies Questions & Answers
I got the freebsd kernel source from the first install CD(in directory:\7.0-RELEASE\src\),isn't right? if so,how can i read it? Is there any tools? (4 Replies)
Discussion started by: zhouq3132
4 Replies
6. Web Development
Server: FreeBSD 7.2-RELEASE
MYSQL Version: MYSQL 5.1.36
PHP Version: 5.2.10 (apache2handler)
IP.Board Version: v3.0.2
Safe Mode: OFF
For the most part previously IP.Board, forum software, has run fine without any issues. Regular web pages and .php pages seem to load fine without any issues.... (2 Replies)
Discussion started by: Dark Severance
2 Replies
7. UNIX for Dummies Questions & Answers
I wrote a script to batch-create directories with .htaccess and .htpasswd files.
I am using the following line to create the .htpasswd file:
htpasswd -cb .htpasswd $USER $PASS
However, I keep getting this message in return:
Usage: htpasswd passwordfile username
The -c flag creates a new... (1 Reply)
Discussion started by: Spetnik
1 Replies
8. BSD
Hi!
I have a major issue with FreeBSD 7.1 i386.
We did a change in our Unix env where we exchanged home storage from a NetAPP running udp to a NetAPP running tcp.
Now I cant mount homedirs since NFS/AMD seem to fallback to udp :(
Trying to force it with amd options nfs_proto=tcp and so on.
... (0 Replies)
Discussion started by: Esaia
0 Replies
9. AIX
(1) Hi, Am working on FreeBSD 7.4/i386 and installed Opera 11.01 through ports collection manually... But when I run first time am getting "opera: cannot connect X server. Error: Unknown error: 0" What is this error all about???? Please help me to sort out this issue!!!
(2) Hi, currently am... (12 Replies)
Discussion started by: Priya Amaresh
12 Replies
10. BSD
I just got FreeBSD up and running with an XFCE desktop on an old Gateway laptop. It works great, except the wireless setup is scaring me. I can connect to my home WiFi fine most of the time, but I'm concerned about other WiFi that I will need to connect to away from home.
I understand that I can... (1 Reply)
Discussion started by: BrentBANKS
1 Replies
LEARN ABOUT LINUX
pam_wheel
PAM_WHEEL(8) Linux-PAM Manual PAM_WHEEL(8)
NAME
pam_wheel - Only permit root access to members of group wheel
SYNOPSIS
pam_wheel.so [debug] [deny] [group=name] [root_only] [trust]
DESCRIPTION
The pam_wheel PAM module is used to enforce the so-called wheel group. By default it permits root access to the system if the applicant
user is a member of the wheel group. If no group with this name exist, the module is using the group with the group-ID 0.
OPTIONS
debug
Print debug information.
deny
Reverse the sense of the auth operation: if the user is trying to get UID 0 access and is a member of the wheel group (or the group of
the group option), deny access. Conversely, if the user is not in the group, return PAM_IGNORE (unless trust was also specified, in
which case we return PAM_SUCCESS).
group=name
Instead of checking the wheel or GID 0 groups, use the name group to perform the authentication.
root_only
The check for wheel membership is done only.
trust
The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the user is a member of the wheel group (thus with a little play
stacking the modules the wheel members may be able to su to root without being prompted for a passwd).
MODULE TYPES PROVIDED
The auth and account module types are provided.
RETURN VALUES
PAM_AUTH_ERR
Authentication failure.
PAM_BUF_ERR
Memory buffer error.
PAM_IGNORE
The return value should be ignored by PAM dispatch.
PAM_PERM_DENY
Permission denied.
PAM_SERVICE_ERR
Cannot determine the user name.
PAM_SUCCESS
Success.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non-root applicants.
su auth sufficient pam_rootok.so
su auth required pam_wheel.so
su auth required pam_unix.so
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_wheel was written by Cristian Gafton <gafton@redhat.com>.
Linux-PAM Manual 05/31/2011 PAM_WHEEL(8)