Server :: How To Create Kernel Dump On RHEL 4.7
Jan 11, 2011
My application team is asking me to generate the kernel-dump.
Here are details about my server.
OS: RHEL 4.7/32 Bit
Kernel Version: 2.6.9-89.0.23.ELsmp
Processor: Intel(R) Xeon(R) CPU E5520@ 2.27GHz
Hardware: HP Proliant 380G6 series server.
I am using Electric Cloud applications. Sometimes it creates some kernel panic and immediately got rebooted. Kernel-debuginfo rpm is not installed. In some thread, I read the kernel-debuginfo rpm's version should match with the kernel version. In my case I couldn't even find the exact version of kernel-debuginfo version.
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Dec 29, 2010
I am using RHEL 4.7 (32bit) on HP Proliant 380G6 series server. We are using Electric Cloud Agents on these servers. Nowadays we are facing some memory issues and its creates some kernel panic and then restarts the server. When i reported the issue to my application team, they asked me to come with the core dump. I googled it enough, then i set ulimit value as unlimited. (previously it was 0, then i made a entry in /etc/profile file as follows
ulimit -c unlimited) But still whenever my server restarts due to that kernel panic, it couldnt generate the core dump. My application was installed on /opt
The attached document has the kernel panic logs
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Jun 5, 2009
I need to discover more detail error kernel panic in my linux box, some body know any way do dump in kernel Linux?
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commands to create a DHCP server in RHEL 5.1
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Dec 7, 2010
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May 20, 2010
I am trying to look at installing the PAE module on a RHEL 5 2.6.18-53 system and I cannot seem to find that around. I had hoped to find out if installing the CentOS 5 2.6.18-128 or 2.6.18-164 kernel-PAE modules would have a lot of negative consequences? Perhaps one of you could direct me to a download site that would provide kernel-PAE for a 2.6.18-53 build?
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Apr 28, 2009
How do I get a full kernel dump?
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Oct 7, 2010
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Mar 12, 2009
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Sep 6, 2010
I have used Dump Command to dump the application files. For Full backup the level 0 is working fine. For incremental backup I used the level 1 or 2 it is getting the error as
DUMP: Only level 0 dumps are allowed on a subdirectory
DUMP: The ENTIRE dump is aborted.
The code I used
===============================
#!/bin/bash
#Full Day Backup Script
#application folders backup
#test is the username
now=$(date +"%d-%m-%Y")
[Code]...
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Oct 7, 2009
I want to generate core dump files from my program when it crashes. Its a pretty big process and has about 10-11 threads in it.I have followed the documentation to enable core dump by setting ulimit to unlimited etc. I quickly tried "A demo program creating a core dump" from the following webpage, which succeeds in Segfault and dumping a core file in the directory that I configured.However, I tried running my original program and caused it to crash. I did this by making calls to kill(), raise() or the same null pointer access as shown in the webpage above. In each case, my program crashed but did not generate a core dump file. Am I missing something?My program is in C++ and my environment is Redhat 9.0 (kernel 2.4.20)
Going through the "Why do I NOT get a core dump?" section on the same webpage as above, I can see two potential problems. One - there are issues with the suid/sgid (bullet # 6). I am not able to change any settings with suid because my system does not contain either /proc/sys/fs/suid_dumpable or /proc/sys/kernel/suid_dumpableTwo, my program has threads in it and the bullet # 8 is the problem.
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Mar 2, 2011
is possible to edited the default RHEL CD to have it automatically install RHEL based off of a kickstart file that I will store locally on the CD. My plan would be to put a cd in a server and have the OS automatically being installed.
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Feb 1, 2011
We are planning to migrate our LINUX server from RHEL 3to RHEL 5. What are the configuration difference between RHEL 3 to RHEL 5 for webserver installations?
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Sep 7, 2010
I am still new in linux (Redhat) i used dump command to backup the root of the linux server: #dump -0u -f /dev/st0 / the command is achieved. how to restore this dump.
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Dec 14, 2010
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Dec 9, 2009
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Apr 14, 2010
I'm quite new to linux, but I've managed to grasp some basics. Now my intention here to create a virtual directory, which I resorted to creating an Image File so that I can mount it and have my folder have a dedicated storage. I will mount this image as a loop device. Well it's not much of a problem, but I would like to know whether this is suitable. Say I want to create a 25GB Image.
Code:
dd if=/dev/zero of=/home/disk-img/25GB.ext3 bs=1G count=25
Is this recommended? I'm using block size as 1G which is really huge, so I was wondering, if this is actually recommended. From what I read, some said that it's only advisable to use 4096k or lower, but what I found was that these suggestions are very dated (year 2003), and it is now 2010, so I would like to know if it makes any big differences.
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Jul 7, 2010
Using CentOS 5.5. I have a handful of users that I need to have connect to my server via sftp and start in the same directory. for example, user1, user2, user3, etc.. will connect via sftp and upon connection will all be in the /some/dir/path/ftp-root directory.I know one way is to create these users all with the same 'home' directory, since by default a user starts in their home directory when connecting via sftp, but before just doing that, I wanted to find out if that is really the appropriate method to use? alternatives? Is there some setting on the sftp server end that could direct all users to one starting directory so that these users don't have to have the same 'home' dir? I'm using the sshd daemon that comes with CentOS 5.5 (with all current updates/patches)
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Mar 15, 2010
Having done a short DoD wipe of hard drive (Dareks Boot & Nuke),I installed Windows XP on the first half of the drive and again zeroed the other half of drive for installing Debian.Please see attachment of screen shot for command lines input and output.After doing a grep for non zero characters on the second half of the drive(sda2)I was puzzled to find a grep command line search for non zero characters actually turned some up. I have no idea why they are there or what if anything they mean
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Oct 18, 2010
Is there any command available inorder to read the server crash dump files?
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Jan 12, 2010
Need confirmation if the following scenario works for making my client and server as identical?
My local(source) Linux server @192.168.0.2
My remote Linux client @192.168.0.70
On the local system :
#df -m
Filesystem Mounted on
/dev/hda3 /
/dev/hda1 /boot
tmpfs /dev/shm
On the local system , issue the followings to make client and server as identical :
#dump -0uvf - /dev/hda3 | ssh root@192.168.0.70 -c "restore -rf - /"
#dump -0uvf - /dev/hda1 | ssh root@192.168.0.70 -c "restore -rf - /boot"
#dump -0uvf - /dev/shm | ssh root@192.168.0.70 -c "restore -rf - /tmpfs"
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Apr 14, 2011
One of my clients needs a backup of his svn repository. I see that this is possible using svadmin dump command. I see where the location of the source repository is, but I don't see anything in documentation as to where the actual dump file is located. I need to know where the dump file is so I can scp or rsync the file to another server for backup.
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Nov 12, 2009
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Apr 22, 2010
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Apr 18, 2011
I am trying to build an tk.8.4.19 with the rpmbuild command. In the spec file there is a make command that uses the supplied Makefile that builds tk and untars it to the build directory /usr/src/redhat/BUILD/tk_8.4.19/unix .
The issue is that /usr/bin/wish is compiled with the make command and renamed to wish8.4, , and when the rpm does build it does not contain the link /usr/bin/wish -> /usr/bin/wish8.4 and there are other custom rpms on our systems (built by other people) that call /usr/bin/wish.
I have tried adding the ldconfig ln -sf /usr/bin/wish8.4 /usr/bin/wish in the %install and %build directives, it is in the tar file. I have tested it by creating the tar with the link and creating a null file call wish but it never gets built into the rpm. Whenever I call out /usr/bin/wish in the %file directive the rpm wont build.
I believe it will install and create the link if I tell it to ignore or skip the prereq check. That requires options to the yum command but it creates a problem because I need to to work with yum -y install <tk> or yum -y upgrade <tk> through a unattended script.
Bottom line is that I need the file to exist in the rpm or after the install and yum needs to be aware that /usr/bin/wish link is there so it doesn't require an override option during install.
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May 18, 2011
I use putty to get to my RHEL 5.3 workstation from my Windows laptop.
Typically, if I want a new terminal on my windows 7 workstation from another terminal or mc, I have to type start and I will see a new terminal window running the default shell.
QUESTION : What is the equivalent command in RHEL 5.3 (and or solaris) to create a new terminal window from the command line ? I will be entering this command from the shell prompt or mc's command line.
In Windows, if I want to start another terminal and in that terminal, I want to run a program, I can do "start program.exe arg1 arg2". this will create a new terminal window and runs program.exe in that terminal window. I don't have to create a terminal and then in a separate step run the program. How can I do this in Linux ?
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Jan 11, 2010
Was upgrading to the newest kernel in RHEL5 from 2.6.18-164 to 2.6.18-164.10.1 but when I rebooted the machine it gave me these errors.
Unable to access resume device(/dev/VolGroup00/LogVol01)
mount: could not find filesystem /dev/root
setuproot: moving /dev failed: no such file or directory
setuproot: error mounting /proc no such file or directory
setuproot: error mounting /sys no such file or directory
switchroot: mount failed: no such file or directory
kenel panic - not syncing Attempted to kill init!
So I rebooted the machine and picked the old kernel to boot up (2.6.18-164) and everything came back up fine. I don't understand why it keeps failing when trying to boot to the new kernel. I am using the yum upgrade command, is there a different command I should be using?
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