Server :: XEN Machine Hung Sometimes Caused By Java?
Jul 23, 2010
I have several xen virtual machines but the issue is occurring only on the one of them. Sometimes (4 times per month) the server hung. I can ping this server on the network but I am not able to login to server using local console or ssh session.
[Code]...
I sounds like the issue is caused by some Java application. But I am not sure is this message is related to root cause or the Java is impacted as a result of issue.
Could you help me with this? I need more details regarding error message described below and I also need to identify the root cause and resolve the issue. Is there any way how to determine which Java application is causing this issue?
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Sep 25, 2010
I was doing a kernel update and can no longer boot into 11.3. I am dual booting with XP. I get Grub screen but no longer see Suse as a boot option, only Windows. I have tried to reinstall, but for some reason I can't get it to boot with DVD. So, is there a way that I can repair my computer without doing a reinstall?
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Jan 23, 2010
Have a McFee Server; SuperMicro 370der, P3 Dual 1 ghz, 256 gig ram, 2 18.2 gig scsi(lvd) drives.Have tried loading 4 versions of ubuntu to my server and get hung on the agp chipset. don't know where to go to get it to work. Tried 6.0 to 9.10.
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Apr 10, 2011
If khungtaskd stopped a hung process is there any way to know what that task was? I.e. does khungtaskd leave any kind of log record?
Or any other way to find out if a task hung.
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Dec 16, 2010
Last week my server crashed. I'm trying to diagnose the cause.
This is the relevant error message in /var/log/messages:
Code:
I'm assuming that I can conclude, then, that apache/httpd was the cause of the memory leak?
Next, I've been tracking my memory usage. Using top, this is an average memory load level for my server:
Code:
I'd like to confirm if my understanding of this data is correct, because Plesk indicates that my memory usage is only 50% or less. (Though I have read a number of reports indicating that Plesk's measurements are frequently wrong.)
Top says: Of the 2,073,156K total memory, 1,982,572K (95.63%) is being used, 90,584K (4.37%) is free. Of that sum, 421,948K (20.35%) are being used as buffers. Additionally, of the 2,096,472K of Swap, 60K is used, and 887,700K (42.34%) is cached.
My questions: Is my memory actually being 95% used? Or is the buffered quantity (20.35%) not a use of physical/virtual memory? (i.e. is it disk usage?) Does the amount of cached Swap influence the percentage of physical/virtual memory being used?
In other words, who is correct? Plesk says I'm using 40-50% of my memory, whereas top says 85-95%.
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Aug 25, 2011
My CUPS server has hung. Doesn't ask login user/pwd any more - goes straight to admin page. When I try to add printer I get an authorisation error. So unable to do any admin functions: add printers, disable Kerberos authentication etc.
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Feb 10, 2010
When power was restored after an outage, my server (running Ubuntu server 9.10) started back up & got stuck in the GRUB menu ("Version 1.97~beta 4" I think) - it didn't do that countdown & auto-select the top item like I'm used to. Just stayed there, and since the server is headless, I had to dig out my monitor & hook it up to see what was wrong.
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Jan 23, 2010
Have a McFee Server; SuperMicro 370der, P3 Dual 1 ghz, 256 gig ram, 2 18.2 gig scsi(lvd) drives. Have tried loading 4 versions of ubuntu to my server and get hung on the agp chipset. don't know where to go to get it to work. Tried 6.0 to 9.10.
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Jun 23, 2010
I just recently installed RT Tracker 3.8.8 on a Centos 5 VM install. I've been running 3.6.6 for more than a year now with no issues. But I'm having some serious slowness issues with 3.8.8. When I start the httpd service at least one of the processors go straight to 100%. It also tends to do this when you browse to it for the first time. I've been trying to figure out the problem, but I can't get a grip on this one. This error pop's up in the /var/log/messages log:
Jun 22 11:03:56 helpdesk RT: Apache2::RequestIO::rflush: (103) Software caused connection abort at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/ApacheHandler.pm line 1020 (/opt/rt3/bin/webmux.pl:79)
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Feb 10, 2010
I am running centos 5.4, kernel 2.6.18. Also running httpd (apache2) as a reverse proxy with the following modules
mod_ssl
mod_cache
mod_proxy_*
Recently after updating these modules:
mod_ssl x86_64 1:2.2.3-31.el5.centos.2
httpd x86_64 2.2.3-31.el5.centos.2
distcache x86_64 1.4.5-14.1
I am getting wierd errors in the error logs:
[Wed Feb 10 15:44:18 2010] [error] (103)Software caused connection abort: cache: error returned while trying to return disk cached data
[Wed Feb 10 15:44:45 2010] [error] (103)Software caused connection abort: cache: error returned while trying to return disk cached data
[Wed Feb 10 15:44:48 2010] [error] (103)Software caused connection abort: cache: error returned while trying to return disk cached data .....
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Apr 28, 2010
What's is the most efficient way to install multiple concurrent Java JDK versions on the same Linux machine?
I need Java5 whilst my current Ubuntu 9.10 Karmic comes loaded with Java6.
I know I could setup a VM for this but I am looking for alternatives.
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Sep 17, 2010
I have a centos 5.5 server. When I do a java -version it says command not found. So it means java is not install right. What are the steps for me to install java into my machine?
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Dec 17, 2010
I am trying to run a .jar file, and I have both JDK and JRE installed. This is the error I keep getting.
Code:
jonathan@linux-d0g9:~> cd Downloads
jonathan@linux-d0g9:~/Downloads> java -jar RSBot2.jar
jonathan@linux-d0g9:~/Downloads>
[code].....
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Jan 17, 2010
im trying to install a .sh file for a online game but i get this error Unrecognized option: -XstartOnFirstThread Could not create the Java virtual machine.
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Jul 3, 2011
How to run java programs on linux .Do i have to install any other software to run java program in my virtual linux system.I use Ubantu.
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Apr 9, 2010
I need to access a Windows Server 2000 machine using a Linux machine via KDE, but that will migrate to Gnome. The Linux user to connect to Windows machine, you should open an application 'XYZ' automatically, and only this, denying any unauthorized access. When you close the application 'XYZ' communications (RDP?) Should be terminated. Do I need a log of accesses and possible attempts to circumvent the system and access other application.
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Jul 4, 2011
I have had a Dlink 323 network file server for some time. After first getting it going, it has worked fine on both my Ubuntu computers and my Windows machines including a dual boot Ubuntu machine / Vista box. Recently, a problem has appeared that started at about the same time. The Ubuntu machines give me the "Unable to mount location, Failed to retrieve share list from server" error message. The Windows machines still work fine. This message can be caused by a number of problems. I suspect that this time was caused by a update. The linux machines are 11.04 and 10.10.
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Aug 28, 2010
I think I put this in the wrong place
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Jun 21, 2011
iam trying to sync file server data into backup server machine by command- rsync -avu path/of/data ipaddress-of-backup-server:/path/where/to/save after running it ask for root password and manually it is successful.but i want to make it automatic.for that i also tried cronjob and also generated authentication key but iam not successful in login automatically..anybody know how to authenticate root to login for storing data in backup server.
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Jul 26, 2010
I've just installed java (jre-6u21-linux-i586.bin) on Red Hat 4.4 AS and issued this command to check the java version: java -versionand got :bash :java: command not found
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Feb 2, 2011
I try to config my apache server to list all my files: c/c++, php, java files, like the txt file on my server,
e.g /var/www/mydomain/pub
i want to dump all my c/c++, php, java file under the pub directory and I can access it from my domain name,
if I dump txt file, I have no problem to view it, but when I dump c/c++ or php files under pub directory, then I can't view it like regular txt file,
Q: is there anyway I can configure my apache server to view all the c/C++, php, java file as like txt file?
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Feb 23, 2011
config my apache server to list all my files: c/c++, php, java files, like the txt file on my server, e.g /var/www/mydomain/pub i want to dump all my c/c++, php, java file under the pub directory and I can access it from my domain name, if I dump txt file, I have no problem to view it, but when I dump c/c++ or php files under pub directory, then I can't view it like regular txt file, Q: is there anyway I can configure my apache server to view all the c/C++, php, java file as like txt file?
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Jan 4, 2010
If you hadn't guessed it from my last 3000(ish) java-related posts, I'm a Java n00b writing a Java Applet for a work project. I got to the part was I was about to write the applet code that would send HTTP requests to my CGI scripts. But I read some paragraphs in a book praising Java servlets as better that CGI because they are easier to use and give much better performance server side. My server load isn't very big, though, and I was wondering if it would be worth taking the time to learn about Java servlets and how to set up the server side configuration on my Fedora web server.
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Nov 17, 2010
My problem is laptop is always hung what can i do?
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Jan 22, 2010
I recently installed Ubuntu on my computer, and today after hooking up the internet for the first time it asked me to update. I clicked install, then restarted the computer.
While booting up it hangs up after the following is displayed:
fsck from util-linux-ng 2.16
/dev/sda1: clean, 149460/2400256 files, 984175/9582764 blocks
I've tried ctrl-alt-delete, it restarts, asks me how I want to reboot, and whether I choose generic or recovery mode it still hangs up here. What can I do to be able to access my computer again.
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Jun 13, 2010
my mother woke up and came in here to get online and when I hit her name on the sign in screen its just stuck with her name on the screen So she woke up me and I hit CANCEL SIGN IN and now its stuck on CANCELING..... And its been like that for 10 min I am too scared to do ctrl alt backspace because its going to log me off of everything
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Oct 31, 2010
I upgraded a machine this morning from 9.04 to 9.10 and it went off without a hitch. I then began another upgrade from 9.10 to 10.04 and it appears to have hung. Everything worked fine up through getting new packages, but when installing the upgrades; it got to Unpacking replacement javascript-common ... it opened a terminal window and stopped. It still says about 20 minutes remaining but it's been saying that for about half an hour. Is there any way I can get it to resume? What do I do now?
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Feb 11, 2010
Hello, im running ubuntu 9.10 on my laptop and im trying to make a win xp vbox and when it gets to the part where is is creating the virtual hard drive (30GB in my case) it just stays at 0%. I left it running last night and went to bed, in the morning it was still at 0%. Now iv just tryd it again and its been sitting for about 2 hours now and still at 0%.
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Aug 9, 2010
My computer was getting slow. I know I had a problem with flash for sure. I was thinking it was because I haven't done a dist-upgrade in a while and there were a lot of updates.
So last night I backed up all my important data and did a dist-upgrade. Well now IceWM no longer shows and it just boots to command line. Not the first time I've done that.
Anyway, when I run 'apt-get -f install' I get hung up with errors on Samba.
Errors were encountered : /var/cache/XXX...samba_2%3a3.4.8~dfsg-2_i386.deb
I tried to remove samba but was unable to and 'dpkg -r --force-all samba' returns a processing error.
The error states that it can't locate File/Temp.pm in @INC.
I am sure someone with more knowledge could easily salvage this. Funny, I have been running sid for 5-7 years now and it has given me very few problems. And pretty much every problem has originated from my hand. Typing the wrong thing, accepting the wrong option, or accidentally deleting the wrong folder.
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May 26, 2011
I opened a VM in VirtualBox and it hung up (I think that the VM itself hung up, not the OS inside) and it can't be killed, it just sits there, consuming 100% of one CPU core and not redrawing itself.The worst part is that it causes any program that lists running processes to hang up the same way. When I run, for example, ps or ksysguard from the command line, they hang up and can't be killed using ^C.I wonder if there's a way to fix this other than rebooting (not that I have much apps open, but I'm still curious what happened here)?
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