CentOS 5 :: How To Know What Process Was Busying Before Forced Reboot
Mar 22, 2009
My centos machine suddenly stuck, the hdd LED flashes constantly, and the system reacts to all my operations very slow. I even cannot log in to a native terminal (always timeout). I had no choice, I pressed the power button. Reboot once failed. The system failed to find mount points.
I inserted the installation disk into computer and entered rescue mode. But I found everything was there. And another reboot brought up the system. I wonder what was the process that stuck my system.
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Jan 12, 2010
I am running 9.04 Server (standalone). It had been running fine since I installed in last autumn. Upon reboot, fsck of the root filesystem was forced and it hangs at the same point (16.5%) every time. I was able to break out somehow with cntl-alt-del but the boot was to a read-only filesystem. So I couldn't disable the forced fsck. Instead, I tried to fsck there. It started, but hung. I couldn't do e2fsck -v as it needed the device and, although I worked on UNIX systems for decades, I am not familiar with the /dev/mapper stuff.
Looking at other threads, all involving the desktop GUI Ubuntu, I tried some of the suggestions. Went into the BIOS to see what I could disable. I killed the serial port and similar. (Some said that onboard modems interfered with the checks in /dev.) I also tried to boot from my original installation disk. That does work.The suggestion is to choose "Try without any change to your computer". The problem is that is not available on the server installation, apparently only the desktop (GUI). I had install, check CD for defects, test memory, boot from first hard disk, and something like repair or recover a broken disk. I started the last of them, as it seemed to be the only option. It failed because it couldn't get a dhcp address. I could manually configure it (as it is hard addressed anyway), but I didn't want to start screwing up configurations not knowing where it was going, whayt it would ry to do, and risk losing months of hard work.
Without help, I think I will be forced to install the OS on a second drive, use that install to fsck the original filesystem on the original disk, edit the fstab (or whichever has the config) on the original disk to disable fsck, and return to the original boot.I am building this server for a nonprofit and have put in many hours writing mysql/perl apache cgi code for them as a free service and hate to lose it all and set back everything.
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Mar 18, 2010
When I put my computer running Ubuntu 9.10 into suspend or hibernate the screen goes black with a little flashing underscore in the corner and when I try to bring the computer out of suspend or hibernate nothing happens and I am forced to manually reboot.
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Jun 30, 2009
I had tried to install Centos 5.3 using the graphical interface but it gives me a black screen with no response. I've read into it and installed in text mode but still need a graphical interface. Whats the command/steps I need to take?
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Jul 23, 2010
I am hosting a few customer servers now, all of which are virtual machines running on a CENTOS 5.x host. Each Centos host has a couple of extra drives. When I formatted them ext3 they automatically had a schedule of a full forced fsck after 6 months. Do I really need to do that check regularly? It results in a fairly large outage since my disks are each 1TB and there are up to three extra drives on each server. I try to reboot these servers every 6 months but this part adds a large amount of time to a routine reboot.
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Jul 17, 2011
I had a server with CentOS 5.5 and Asterisk fail today most likely due to the power failure. I guess the stupid electrician turned the power ON and OFF multiple times while changing the burned out fuse without unplugging the PBX. It was set in CMOS to power back on when there is power outage so my two HDDs which were set in RAID-1 now shot.
Trying to start the system and it goes through some check and fixes and then tells me to do Ctrl+D or enter password and run fsck. I have tried both methods and I don't think they yeild anything.
Ctrl+D reboots and same store again with the system fixing and asking me to Ctrl+D again. Putting the password and doing "fsck -y" gives many errors and it fixes it and then it just keeps looping. I am afraid this is making it worst than better. So, after few loops I did few more restarts and just give up. Took out the HDDs and installed new ones and install CentOS+Asterisk so business runs as usual on Monday.
However, I am kind f*ked if I don't get the files out of these HDDs. This is my first time using fsck and also encountering this type of a problem. What is the normal procedure when fixing inodes misplaced in a case like this? and what should I do to at least be able to grab my files?
I have already connected one of the drives to Windows and used Disk Internals (which maps Linux drives) but I see only folders with no contents except for /tmp/ which has contents. While the HDDs were in the system I could actually browse files and they were fine. I am really keen to get the drives fixed but I am also afraid that bad usage of fsck might replace lots of files and burn it all.
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Sep 25, 2009
When I do a forced fsck, I would like to have a log file to look at after boot.
When I check /var/log/ there are no files there with fsck output
I've run force fsck in these ways:
shutdown -rF now
-and-
touch /forcefsck
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May 21, 2010
I looking for a program for automatic or remote reboot process...
Soon I order a VPS and needs a Call of Duty (or other games too) server restarter, if its crash...
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Mar 5, 2011
I need help adding a nohup command in this command line: su - rhx12 -c "/rhythx/rhythx/bin start /rhythx/rhyth" When I execute the script using root on the command line it works fine. But, when I reboot the server the process doesn't start. This script will go into the etc/init.d and rc2.d directory.
#!/bin/bash
case $i in
start)
su - rhx12 -c "/rhythx/rhythx/bin start /rhythx/rhythx"
;;
[Code]...
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Dec 9, 2010
I installed Ubuntu in my PC alongside winXP. I downloaded the ISO and mounted it using a virtual image software (PowerISO used in winXP). I installed Ubuntu using wubi in a 20GB partition. During installation it asked me how much space should I give, I gave it 11gb. Everything went fine. I rebooted but now the computer hangs during startup. I went to verbose mode to see what the error is and found out that everything is ok. The last line that apears is "Setting sensors limit [OK]" and then nothing happens. I have tried every option (safe graphic mode/ demo mode etc etc) but the computer hangs.
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Jun 2, 2010
it stuck after loading. should got login window. instead it show me a blank page and a blinking courser i can only press ctrl+alt+del it will reboot my laptop n stuck after the loading process
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May 25, 2010
I have a startup script placed in /etc/init.d wherein I make the following call:
nohup sudo -u myuser $CATALINA_HOME/bin/startup.sh 2>&1
This causes Tomcat to be run as myuser, which is expected. However after issuing the reboot command the system starts up and root is now the owner of this process. How can I force the process to be started off as myuser on reboot?
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Mar 17, 2010
I am an old days RH release user(from 6.x) and just switching back from Debian/Ubuntu to CentOS on some servers, but I can not understand the kernel update strategy currently enabled in CentOS.There are two boxes, with almost identical installation, but recently there was an auto update of kernel on one box. This auto update also seems to issue an auto reboot on the machine, which is unacceptable on server machines.
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Mar 28, 2009
I am trying to install CentOS 5.2 on an HP rp5700 desktop unit. These units were originally sold as a Point of Sales unit I believe, but HP also markets it as a high life cycle server for SMB market.I tried to load CentOS on this unit via CD (created from downloaded ISO of course). It presents the initial CentOS banner page and waits for the obligatory "enter" to continue. It begins the boot process up to discovering the PCI stuff and just locks up, no response. I have to power down to restart.Since this does not even get to the point of installing. I am at a loss what to do next. Has anyone had a similar issue with other PCs.The boot stops at the lineACPI: PCI Root Bridge [PCI0] (0000:00)
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Oct 22, 2009
I did a yum clean all then yum update and got all the 5.4 stuff at which point I rebooted it gets to the udev entry and dies. Any one have any sugestions on how to fix this?
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Feb 22, 2011
when I reboot the server with centos 5.5 the SMB deamon doesn't start?
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Aug 6, 2009
After rebooting my centos server I no longer have a /dev/sda entry, nor any /dev/sd* entries. What could have gone wrong?
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May 16, 2011
We are using 1 LSI card on our tester to run massive I/O actions, but it seems that after couple of hours (or something like 1 day) of using the LSI, the tester reboot itself.
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Jul 18, 2011
after the 5.6 update I started loosing the connection to my router. Having had issues with routers before I assumed that the router was on its way out. However I happended to have a laptop handy the other day and thought I would give it a try (after eth0 went down), router was fine(same cable too). I have tried bringing eth0 up/down (gui and ifdown/ifup) and restarted the network(gui and cli) but it will not get an ip(as I recall it does recognize that the cable is connected). If I do a reboot, eth0 comes up immediately. The log just shows repeated dhcp requests. I tried a dhclient -r but it errors out with no link found. It has been doing this since 5.6 came out (roughly once a day) so I THINK that it is not a hardware issue(should have died completely by now if it was). PSU voltages show stable and unchanged. It does use the forcedeath driver. 5.6-64bit fully updated.
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Sep 8, 2011
I was wondering if anyone knew how to add a user/pass and allow them to issue the reboot command. Ideally, I dont want them to be able to see files/directories or anything else for that matter.I was thinking something along the lines of a chroot jail that has a single script that would call the reboot.
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Oct 3, 2010
Normally servers having multiple CPU's I need to found out, which CPU is used by a process. or else from the out put /proc/pid/stat how we can identify used CPU by the process
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May 13, 2010
service xend status returns nothing - simply moves to next line
service xend start does the same thing
xm list
ERROR Internal error: Could not obtain handle on privileged command interface (2 = No such file or directory)
Error: Unable to connect to xend: No such file or directory. Is xend running?
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Apr 1, 2009
At 4:00 pm on 4/1/2009 I accepted the offer to dowload and install a number of small improvements. This has always worked in the past. This time there were a few problems with the install, but I went ahead and rebooted. It stopped at grub, stage2.
I am now trying the rescue feature of my install CD. I will report on this later.
As for the always possible hardware failure, I have a raid setup, so I was not expecting this.
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Jul 15, 2009
I'm running a CentOS 5.2 vm on a W2K8 hyper-v core server. The problem I have is that when I reboot, the system time always resets itself to 6:00 am in the morning. I tried the /sbin/hwclock --systohc command but it hasn't taken hold.
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Aug 5, 2009
I have a strange problem with IpTables.after a server reboot, the complete rule-list of iptables is empty. After a manually start, all my old rules are there again.I checked chkconfig if autostart of iptables is enabled:chkconfig --list iptablesiptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off
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Sep 7, 2009
service xend status returns nothing - simply moves to next line.service xend start does the same thing
xm list
ERROR Internal error: Could not obtain handle on privileged command interface (2 = No such file or directory)
Error: Unable to connect to xend: No such file or directory. Is xend running?
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Sep 16, 2009
Google brought me no love on this one, tried searching here with little luck as well. So I'm hoping somebody vastly more experienced than I can shed some light on my plight.
The situation:
I have a CentOS 5.3 x64 server running the latest cPanel which works fantastic. I issued a graceful reboot and the server came back up (according to the DC) just fine to a login prompt. Apparently the system lost all of its IP address configuration. Primary IP, secondary IP's gateway, you name it and it was gone. Now my secondary IP's were showing in cPanel after I had the DC re-enter my main IP address/gateway. But listed as not active due to the fact that they were not anywhere to be attached to the interface. i.e. eth0:1 eth0:2 etc and so on.
I have no idea where to begin looking for this problem and am afraid to reboot it again (at least until I get my lantronix spider up there). I've never experienced this with any of my other CentOS/cPanel servers either. All similar configurations CentOS 5.3 x64, latest cPanel as well. My hardware is all Supermicro gear as well and has been solid in the past.
Maybe I'm just missing something, granted I've only been managing Linux based servers for about two years now. This is actually the first real problem I've ran into on any Linux distro, they are normally pretty solid. So I assume it's a configuration error on my part somewhere.
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Oct 13, 2009
I'm looking for insite on how it might be possible to grow an existingvolume/partition/filesystem while it's in active use, and without having to add additional luns/partitions to do it.For example the best way I can find to do itcurrently, and am using this in production, is you have a system using LVM managing a connected LUN (iSCSI/FC/etc), with a single partition/filesystem residing on it.To grow this filesystem (while it's active) you have to add a new LUN to the existing volume group, and then expand the filesystem. To date I have not found a way to expand a filesystem that is hosted by a single LUN.
For system context, I'm running a 150 TB SAN that has over 300 spindles, to which about 50 servers are connected. It is an equal mix of Linux, Windows, and VMware hosts connected via both FC & iSCSI... With both Windows & VMware, the aforementioned task of expanding a single LUN and having the filesystem expanded is barely a 1 minute operation that "Just Works".If you can find me a sweet way to seamlessly expand a LUN and have a Linuxfilesystem expanded (without reboot/unmount/etc)I have cycles to test out any suggested methods/techniques, and am more than happy to report the results for anyone else interested. I think this is a subject that many people would like to find that magic method to make all our lives much easier
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Jun 22, 2010
I installed CentOS 5.5. After install, I decided to put 3 identical disk for raid 5. All the disks are IDE disk. Then I put a sata disk and partitioned it to add another partition to the raid 5 array. Everything works fine until I rebooted my system. After reboot, the sata partition I added into raid 5 is showing removed. I had to readd it using "mdadm --add" to make raid 5 array works.
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Sep 22, 2010
I had Oracle install on my machine and there were some ASM partitions. after uninstall of oracle some how it removed the swap space and now is showing:
[Code]...
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