Tagged Questions
0
votes
2answers
89 views
unexpected server power off
Once or twice per day I find a server I have powered off with no apparent reason.
Info and what I've done until now:
Nothing is being reported under /var/log/. Just normal server activity and then ...
0
votes
1answer
107 views
Diagnosing SAN connectivity issues (RHEL5)
We are currently utilizing GFS2 to share a SAN LUN between 3 servers. However due to a feature problem with vendor software we are using, we currently have the volume unmounted on two of the boxes, ...
0
votes
4answers
123 views
Server freeze - how to debug
I am running a Debian virtual server with Apache, PHP, MySQL. There is just 1 website with very low traffic running but the server very often (almost everyday) freezes and does not respond.
When ...
0
votes
2answers
103 views
Server unresponsive, messages shown on console but not in log files
I'm using Ubuntu Server 10.04.4, and once in a while the server hangs (once a month) and is totally unresponsive. The tty is flooded with messages like these. The problem is that these messages are ...
0
votes
1answer
381 views
Trying to bridge NIC. What does this error mean?
I would like to bridge between br0 and tap0 for my OpenVPN server, but I get the error at the bottom of this post.
Background
The server have one physical eth0 with IP xxx.xxx.68.58.
The bridge ...
1
vote
3answers
96 views
Ubuntu 10.04 install is missing /etc/rc0.d, is there a quickfix?
I have no idea how this happened, but /etc/rc.*/ is simply missing.
As a result, aptitude and apt-get don't work right anymore.
Is there a quick-fix for this? I really don't want to reinstall the OS ...
0
votes
4answers
237 views
Ubuntu troubleshooting
I have a computer which keeps becoming unreachable, and a restart fixes the problem. It's under somewhat heavy load (high cpu, and high ram usage), but appears for the most part stable.
What's a good ...
1
vote
2answers
742 views
Server is rebooting unexpectedly, strange kernel messages in log file
I have a server running Ubuntu 10.04 that is rebooting several times a day it seems, and I can't figure out why. It doesn't appear to be a graceful reboot either, because some of the services complain ...
1
vote
2answers
781 views
SSH closes connection when key is accepted
In server's auth.log:
Failed publickey for agladysh from MYIP port 61313 ssh2
In ssh -vvv:
debug1: Offering public key: /Users/agladysh/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a ...
0
votes
2answers
253 views
Troubleshooting firewall and routing on Linux
Are there any tools or API hooks for troubleshooting iptables or routing on Linux? (besides the obvious -j LOG)
In other words: what to do when tables with 200 or 300 firewalling rules after adding a ...
5
votes
3answers
2k views
Troubleshooting linux server reboots?
I have a Linux server I've just set up, debian squeeze, 2.6.32-5-amd64, and over the past week it's rebooted three times, twice in one day. There was no power outage that I am aware of (and it's ...
3
votes
2answers
1k views
Cannot mount /dev/sdc1 on Debian 5.0, special device /dev/sdc1 doesn't exist
I'm trying to fix an odd problem I'm having that I've never seen or heard of before. I have a disk, /dev/sdc and I'm trying to mount it, but cannot.
sudo mount /dev/sdc1 /mnt
mount: you must ...
0
votes
1answer
443 views
Random Ubuntu server network disconnects
After installing Ubuntu Server 10.04.1 on a new x86_64 kvm instance (Debian
6.0 hosted) I'm getting -apparently- ramdon disconnects from the server.
Read from remote host myserver:
Connection ...
8
votes
3answers
7k views
page allocation failure - am I running out of memory?
Lately I've noticing entries like this one in the kern.log of one of my servers:
Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20
This is what I'd like to know:
...
2
votes
6answers
633 views
My Ubuntu 10.04 server kills all WAN bandwidth when it's attached to my LAN. Where do you begin troubleshooting?
First I should say that my Linux knowledge is minimal; just enough to set up some servers (Apache, Tomcat, Couch, etc). I built a MiniITX server to host some simple sites, act as an SSH tunnel while ...
0
votes
1answer
422 views
Troubleshooting why my SSH sessions hang for a couple of seconds
I'm logged in to my development box via SSH (using PuTTY on my laptop) and periodically, the session would just hang for a couple of seconds then becomes responsive again. I have not been able to ...
1
vote
2answers
426 views
What steps should I take to determine the root cause of linux server failure?
I am sorry if this question has been addressed before, I am assuming it has, but after a half hour of searching I couldn't find anything.
Anyway, to the question:
I am a windows guy and a ...
0
votes
2answers
2k views
How can I diagnose an Ubuntu system freeze after reboot
One of our servers froze yesterday, apparently refusing to serve any HTTP requests. The tech guy on site could not connect remotely to the machine, so he rebooted the (virtual) machine from the VMware ...
0
votes
2answers
658 views
Postfix not actually sending e-mails
So after following the Ubuntu Postfix tutorial, I tried their recommended test
telnet localhost 25
MAIL FROM: person@mydomain.com
RCTP TO: person@gmail.com
DATA
some text here
.
I received a ...
0
votes
2answers
463 views
syslog or splunk forwarding over the internet
I have a web application that is split over a couple of sites in the US and the UK. When we have issues I would like to be able to view the collated error logs from the 2 sites.
So I was thinking ...
2
votes
2answers
1k views
Diagnosing Hardware Problem in Linux Server that's Kernel Panicking
We have a server that has been occasionally kernel panicking for a while now that we believe has a hardware problem. How would you go about troubleshooting hardware that you don't have physical access ...
0
votes
2answers
291 views
Better approach for diagnose web server failure
Yesterday my web sites were down for a short time. I logged on my server and my first reaction was restart the apache web server. After that everything was working fine. So I start to check the ...
0
votes
2answers
2k views
remote connections and mysql on ubuntu?
I have Ubuntu running in VMWare. I installed mysql 5 server and comment out bind-address and restarted the mysql server. I am now trying to connect to mysql but i cannot. I tried using 1) Code and 2) ...
2
votes
4answers
429 views
Tracking down load average
The "load average" on a *nix machine is the "average length of the run queue", or in other words, the average number of processes that are doing something (or waiting to do something). While the ...
2
votes
2answers
6k views
Can someone see why my DNS won't work? I followed everything in the tutorial, but won't work
If anyone can help me troubleshoot this, I would very much appreciate it!!
The tests work. It's just that when I do the manual ping/nslookup test, nothing is working.
By the way, I followed ...
28
votes
8answers
18k views
Environment variables of a running process on Unix?
This is to troubleshoot some problems related to environment variables ..
On Windows, I could do this by using tool such as ProcessExplorer to select particular process and view values of each ...
2
votes
3answers
3k views
Exim taking long time to send emails, how to decrease delay in Exim service?
The linux server where exim service is running is under no load.
The system is sending email successfully but is taking a long time to send each email.
Basically if I telnet to localhost port 25 ...
0
votes
1answer
144 views
FTP connection hanging on 200 Welcome to blabla FTP services
I am having problems when connecting to a remote ftp server that is running on UNIX.When I try to coonect it freezes on the welcome screen and it dos=esnt prompt for password and username.
Connected ...
2
votes
1answer
3k views
clocksource tsc unstable
Ok, now I have real server fault ;)
After some time from booting (about one minute) my server hangs. All I can do is hard reset. Then after restart in /var/log/kern.log I can find:
Jul 29 22:38:57 ...
1
vote
1answer
447 views
linux heartbeat losing packets
I am using linux heartbeat to keep ldirectord running on my webservers.
My logs show heartbeat WARN: 1 lost packet(s) every couple of minutes, and I'm having trouble figuring out why.
I have tried ...
4
votes
7answers
377 views
General tips for interpreting error logs
Reading log files can be pretty frustrating as, by nature, their content says as much about the developer who penned them as the problem itself.
Do you have any general purpose tips for interpreting ...
2
votes
5answers
942 views
How to troubleshoot hanging linux server
I have several Ubuntu Server 8.04 machines at a remote location. Every couple of months or so, one of them would stop responding and need to be power cycled. From looking at my log files it seems that ...
