Server :: Nonzero Characters In Hex Dump After Zeroing Drive?
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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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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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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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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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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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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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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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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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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Feb 13, 2011
I am using Debian Lenny 5.0.3 with a stock 2.6.26-2-amd64 kernel, and have a ~/Documents/HTMLS directory of 273.2MB (21590 files, 1063 sub-folders) which according to konqueror shows 1130 items - 572 files (60.8MB Total) - 558 folders, these were created by 'Save Page As' in Iceweasel 3.5.11. I am trying to copy the contents of this directory to a similar directory on a 2GB USB thumbdrive /dev/sdb1 which was partitioned and formatted as fat32 by Qparted. Problem is that the copying ceases after about 6 files transfer. I found that (as I am sure you know) the named.html files come with a matching named_files folder, and often there are what appear to be invalid characters such as '*','?',and ':' in the filenames in said named_files folders.
After exhaustive googling [I know we all say that] I found an instruction:
Code:
pax -rw -s '/[*?:]/_/gp' stuff /fat32/partition
that changes the name of the files, replacing said characters with '_', but whilst I can get pax from my repos, I really don't want to 'archive' the files - since I understand that pax was created to bridge a war between tar and cpio - because I want to be able to read the html files on an old (not connected to the Internet) WinXP tablet. So, I believe that I need to create a script, that scans all the filenames, greps and seds to replace said 'unacceptable' characters. I am assuming that Firefox on the Tablet PC will be able to open the htmls if I can get them onto the thumb drive. Are there any other known characters in filenames that M$ file systems can't handle?
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Jul 8, 2011
What command could I use in terminal to delete all ASCII characters? That is, delete a-z, A-Z, 0-9, and all punctuation? I have a file containing Chinese characters, and I want to remove everything else and leave just the Chinese.
I can use grep to leave only the lines that have Chinese in them, but this still leaves a lot of non-Chinese stuff on those lines. Does anyone know how I could actually remove everything that isn't Chinese?
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Aug 28, 2011
While modifying the definition of my PS1, I saw that "[" and "]" markers should be added to help bash to compute the right display lenght. Many exemples on the web do not use them or even mention them.I searched for a solution to add them automatically, like with sed, but I didn't find any example.Are they still needed and is there a recommandation not to use sed to define PS1?
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Jun 16, 2010
I have my OpenSuse 11.1 box set up with utf-8, however, every time I try to open a file with utf-8 characters with vi it can't handle those characters properly.
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Jul 8, 2010
I have one java web application deployed in Linux environment by which I am trying to download file's from Linux server. These files have samba mounting from windows server. While downloading any file, if the file name contains simple english characters it works fine but if that file name contain German character's like then file corrupt while downloading. After analysis I found that after samba mounting these Germen characters get replaced with '?' in Linux (May be Linux unable to identify characters).Linux environment is set to LANG=en_US.UTF-8.
And we have done mounting with below options,
iocharset=iso8859-15,codepage=cp850
and also try with iocharset=utf8.
Also try by installing following package,
kde-i18n-German-3.0.0-5.noarch.rpm
but it doesnt help us.
The same application works fine in windows environment. I check it on internet, and I found that for this issue you have to add support for German characters in Linux environment. Anybody know how to add German character support to Linux or How to resolve this issue??
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Sep 14, 2010
Can files/directories have Greek characters? If I selected English when installed Linux?
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Jan 17, 2011
When try to deployed squirrelmail, configured display language to "Chinese Simp" or "Chinese Trad", it could not display mail folder and reported "Reason Given: GB2312 character set is not supported." Checked locale/zh_CN[zh_TW]/LC_MESSAGES/squirrelmail.po, file charset encode is utf-8, also locale/zh_CN[zh_TW]/setup.php charset to utf-8, but at functions/i18n.php, it used charset of zh_CN/zh_TW to gb2312/big5. after changed it to utf-8, it working fine.However, all messages received is corrupted characters in chinese
Either the title is corrupted characters, or information is corrupted characters.
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Jul 20, 2009
When I read man pages using the man command, i.e. 'man find', I am missing characters, like this code...
Is anyone else experiencing this or have any tips on how to solve the issue?
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Mar 30, 2010
The software: Ubuntu Server Edition 9.10.The wetware: A programmer doing his best (read: ignorant, shitty) as an ad-h.When I plug the USB thumb drive in, the install OS gives it a drive letter -- /dev/sdb -- and it pushes the original /dev/sdb down to /dev/sdc. The installation works without a hitch, and GRUB2 installs, dutifully pointing the root at /dev/sdc1 instead of /dev/sdb1.I let GRUB2 start normally ("drive not found"), holding the <shift> key to get to the "rescue>" prompt.From there, I issue "ls" to discover that GRUB can NOT see /dev/sdb, and I can tell that because what is showing up as (hd1) does NOT have three partitions as it should.GRUB2 sees a total of 16 drives, not 26, and one of the drives it sees is "fd0" (there is no floppy drive).Issuing commands like "set prefix=(hdx,y)" and "root=(hdx,y)" have no effect as, I think it's just pointing to the (reiserfs)content drives and this GRUB2 tells me "unknown filesystem".I did try them all in vain, hoping that maybe I'd find a kernel somewhere.I used the "rescue" mode of the Ubuntu installer (the USB thumb drive) to get to a root prompt.From there, I mounted /dev/sdc2 (the "shifted" /dev/sdb2) onto /mnt, I mounted /dev/sdc1 (the "shifted" /dev/sdb1) onto /mnt/boot,and then I chroot'ed to /mnt.I edited /boot/grub/grub.cfg, editing every instance of "root=(hd2,1)" to the appropriate UUID for the "real" /dev/sdb1. Then I issued update-grub2.It refused to work giving me an banal "no such partition" error or something like that.
We originally had this server functioning by putting / and /boot on the SS SanDisk, which caused no problems during installation because /dev/sda doesn't get shifted.We then figured it was a good idea to put our OS files on something with failover capability. And that started us down this crappy "shifting drive letter" path.Can I control which drive letter the USB thumb drive gets assigned during the install process?If I could make it be /dev/sdc then I wouldn't be facing this problem.An alternate solution would be to know the cryptic GRUB2 commands that I can issue from the command prompt post-install, pre-reboot.But I'm wondering if that will ultimately work at all considering that GRUB2 couldn't see /dev/sdb at all.
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Jul 26, 2010
I am using ubuntu10.04-server 64bit AMD with fluxbox. After I ran Matlab in a shell (without GUI) the shell does not display characters anymore, but will execute any command, I just can't see the characters that I'm typing.. I use aterm and xterm, does anybody know why that is, am I missing a package?
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Jan 18, 2011
Recently I tried to get BGP table dumps from public route servers. I telnetted into one of those public route servers and ran "show ip bgp" command. My question is: how to save the command output to my local machine? I cannot run "show ip bgp > tmp.txt" on the remote route server.
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Apr 21, 2010
is there a way to get GDB to dump memory map so I can see if certain parts of the memory is executable or not (i.e : if heap/stack is executable). Do you know of a way to do this within GDB session?
Just didn't use gdb, and did instead:
cat /proc/$PID/maps
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Apr 30, 2010
While using gdb to debug a C++ program. What I'd like is to be able to enter an address (or an expression yielding an address), and a size, and have it simply do a hex dump. Or maybe even like:
aaaaaaaa 7473839298 29873479898734 this du mp is fa
aaaaaaab 8298...... .............. ke
(I just made up the hex digits above, and didn't even count columns. But you get the idea)
I'm actually using DDD, so a GUI solution is also acceptable.
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Jul 17, 2009
i've got a non-typical problem here. i've got kvm-ed freebsd (its not so important here) stored on a block device - /dev/sdb8. i wanted to install fedora rawhide there but first i thought it's a good idea to do some backup. so here we go dd if=/dev/sdb8 of=freebsd.img bs=4k
theoretically, dd should do the thing without saying a word, but it doesn't. every time it stops after reaching 16GB filesize (partition is about 35GB) and completely locks the system (only reset helps).the dump worked only once, but when i tried to compress this big image 7z got stucked too and the system froze . the problem occurs when copying to the same drive or to different drive. i've got a partial kerneloops logs, but so far i haven't found the answer.
Code:
Kernel failure message 1:
BUG: Bad page state in process bash pfn:14a224
page:ffffe200048377e0 flags:0040000000000000 count:0 mapcount:0 mapping:0000000000000002 index:2a4b (Tainted: P )
Pid: 9711, comm: bash Tainted: P 2.6.29.5-191.fc11.x86_64 #1
Call Trace:
[<ffffffff810a2be0>] bad_page+0x11d/0x130
[Code]....
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Feb 18, 2010
I got a backup file which first 1000 bytes are as follows:
Code:
00000000 54 41 50 45 00 00 03 00 8c 00 0e 01 00 00 00 00 |TAPE............|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000030 02 00 87 05 51 64 50 48 01 00 00 00 01 00 00 00 |....QdPH........|
[code]....
I tried to restore it:
Code:
$ restore -r -f zzz_labxxxx
Checksum error 32615101403, inode 0 file (null)
restore: Tape is not a dump tape
What application could I use or even try? The man who made the backup can't be reached anymore and we had been left with the backup.
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May 27, 2010
To get core dump from my program, I execute the following commands from the terminal:
ulimit -c unlimited
myprogram
After program crash, I see core file in the home directory. How can I make this mode persistent, to have code dump always?
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Dec 7, 2010
I am trying to create a dump log using tcpdump. I want display the top 10 ip addresses sorted numerically showing how many times the ips are hitting the server. I'm getting frustrated because It's not working how I'd like it to.
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Feb 2, 2011
I've been using Linux for about 8 years now, including Red Hat, Debian, Fedora, Mandrake (now Mandriva), Libranet (R.I.P.), and an aborted foray into Gentoo (not my cup of tea). A few years ago, I switched to Ubuntu, and now I use it everywhere. It runs my Mythtv dvr at home, powers my laptop, and my desktop at work. I'm now considering with some reluctance to return to Debian. I like the basic principles of Debian, and now don't feel I need the latest and greatest packages. However, Ubuntu has generally "just worked" in a desktop setting. Anyone with Ubuntu experience tried Squeeze as a desktop OS yet? How does it compare to Ubuntu?
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