Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

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7
votes
2answers
8k views

console-kit-daemon Hogging CPU and RAM

We have a system that's been a bit sluggish. top reports that console-kit-daemon takes anywhere from 18-30% CPU and about 50% memory. There are only two users logged in, one on X and one via ssh. Any ...
1
vote
1answer
400 views

Encfs error: `/bin/umount: unrecognized option `--no-canonicalize'`

I just installed encfs from source on a synology disk-station (DSM 4.1) and it seems to work fine. But when I try to unmount my encfs directory via fusermount -u I get the error message: fusermount ...
2
votes
1answer
188 views

Diagnose unplanned shutdowns

I have a problem with a server that is shutting down for some unknown reason. I check the logs each time it happens and cannot find anything of particular interest which would suggest why its going ...
3
votes
1answer
192 views

Slow ecryptfs mount

If I create an encrypted share (internally done via ecryptfs) on a synology disk station DS109 (DSM 4.1), mounting is very slow (approx 40 seconds). It doesn't matter if I do it via the ...
1
vote
1answer
463 views

Killed `rm` and `cp` on nfs share

I am just testing an rsnapshot installation on my laptop which should backup to a NAS mounted via nfs on my laptop. On one test rsnapshot died with a cp -al problem (i.e. a problem with hard links) ...
2
votes
1answer
62 views

How might I detect memory errors if I do not have root or physical access to a Linux system?

The background to my question is as follows. I currently rent a virtual private server from a major hosting company, which I use to run a minecraft server. I have a suspicion that there may be bad ...
2
votes
1answer
3k views

Gnome 3 “broken” after upgrades, kind of looks like gnome 2 . . .?

I'm running debian wheezy ( testing ) and after some upgrades my gnome 3 is broken. It's not exactly broken, but it's completey different. Almost like it's no longer actually gnome 3; most of the UI ...
1
vote
1answer
236 views

Accidentally set /lib permissions to 644

Long story short, I've got an Ubuntu server box that was recently compromised (I believe through a known exploit of an older version of Tomcat, which has already been updated). Part of the exploit ...
2
votes
1answer
576 views

Problem with java3d

I want to play this java simulation: http://www.compadre.org/OSP/items/detail.cfm?ID=9640 in java 3d mode on a linux (ubuntu) system. But it doesn't work. If I switch to java 3d-mode it complains ...
16
votes
3answers
20k views

Linux network troubleshooting and debugging

From time to time Linux and Unix users faced with various network problems. Many of these problems are presented here and at some others troubleshooting forums, but the are very concrete and contains ...
6
votes
2answers
2k views

Debugging hanging bash process

After some bad performance today, I checked top: 1 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14229 myuser 20 0 8776 5264 1684 R 99 0.2 1383:47 bash 98-100% ...
6
votes
3answers
4k views

Remote-Accesible Live-Distribution (aka Live CD)

I'm looking for a live distribution (Live CD or the likes) which comes - per default - with sshd running at startup. I want to check the components of my laptop whose graphics has died ...
2
votes
0answers
485 views

can't open netbeans IDE in Fedora 17

my linux version is: Fedora 17 I installed Netbeans IDE 7.1.2 and it was working fine, but now, when I try to open it, nothing happens after double clicking on it. I think updating the kernel may be ...
2
votes
1answer
3k views

how to troubleshoot a network adapter on an AIX 4.3.3 machine

I'm trying to brush up my skills on AIX. I have an ancient RS/6000 43P-133 which I'm trying to resurrect before investing in anything more sophisticated. I used to do automation and scripting on AIX ...
1
vote
2answers
132 views

Non-distro specific, linux tweaking, hacking and learning support IRC

Distro-specific support channels are good only if you run their clean stable versions out of the box and basically don't install anything other than what you get out of the box. But what about those ...
3
votes
1answer
2k views

Trouble booting CentOS

I switched from an Ubuntu to the CentOS yesterday. But it seems I have messed my installation somehow, since OS will only start correctly if the USB with the installation is plugged in. Long story: ...
2
votes
1answer
161 views

Missing entries from messages file

I have a CentOS server that has been working well until recently. The virtualized instance of the server encountered some type of issue earlier today and required it to be hard rebooted in order for ...
7
votes
1answer
369 views

Where should I look for error messages after a freeze-up and reboot in Linux?

I was forced to shutdown (using the power button) and reboot after my laptop froze with just a black screen. After such an incident, where should I look for error messages etc. that might indicate ...
3
votes
1answer
3k views

Why does my mouse stop working a short time into my session?

Running Easy Peasy 1.6 clean installation. Hardware - EEE PC 900-HA. About 10 or so minutes into a new session after a reboot my mouse will stop working. It will still move the pointer, but it will ...
4
votes
2answers
894 views

How to troubleshoot the old X applications working incorrectly on modern X servers?

I have an old X application provided as a part of a complicated signal processing package. The application resides on the display-less server, and clients having different X-servers connect to it. On ...
2
votes
2answers
58 views

How can I determine which service run during bootup is responsible for a certain behaviour?

On my Fedora 14 system, some strange bind mounts have appeared in the list of mounts. They appear on every bootup. I can unmount them with umount -l, but I would like to find which package is mounting ...
6
votes
2answers
775 views

Suggestions needed to debug why ps -ef gets stuck

A few of my processes consume 100% cpu. I'm trying to figure out which scripts are causing it I tried running strace ps -ef: open("/proc/PID/status", O_RDONLY) = 6 read(6, "Name:\textract\nState:\tR ...
3
votes
1answer
565 views

good unix troubleshooting book [closed]

I've been trying to learn *nix and I think I'm doing pretty good as far as basic commands, and I think I understand a lot of the "monitoring" type commands etc... in short, I think I'm doing okay with ...
2
votes
2answers
4k views

How do I reinstall software properly in Debian?

I got myself into trouble with mysql on debian lenny (details). I tried these commands: dpkg-reconfigure mysql dpkg --purge mysql-server apt-get install mysql-server mysql_install_db and variants ...
1
vote
2answers
280 views

How come I suddenly don't have any audio?

Just a few minutes ago my sound was working, and then it stopped! I suspect it was caused by me checking out some video editors. How do I go about troubleshooting this? What I've so far tried: I ...
6
votes
1answer
1k views

What would cause “crossover” between two USB2 webcams when using motion?

I am using the Motion package for linux to act as a security system with two Microsoft LifeCam HD-5000 webcams. In general it's working very well but I'm experiencing a weird issue. Every now and then ...
7
votes
3answers
1k views

Best practise to diagnose problems [closed]

As Linux/Unix users, we run into problems frequently. And after long hours of problem solving, we develop the skill of debugging. Now, what are good principles, methods or best practises when trying ...