On Sat, May 25, 2013 at 11:59 AM, Mark Phillips
<mark@phillipsmarketing.biz> wrote:
I have an old headless server running Linux version 2.6.32-5-686 (Debian 2.6.32-48squeeze1) (
dannf@debian.org) (gcc version 4.3.5 (Debian 4.3.5-4) ). Recently, when I log in using ssh the terminal window freezes for a few seconds, then usually comes back. The command line stops printing the characters I am typing, the cursor stops blinking, and then after a few seconds, it comes back. This happens every few minutes, so it is becoming rather annoying.
Here's the general list (some of which you have done already).
0 - Make sure that it's not swapping with "free".
1 - Check that you have no ethernet errors with "ethtool eth0" (or whatever your interfaces are) and look for errors.
1.5 - Check ' netstat -s -p|grep "segments retransmited" ' for packet loss
2 - Check "netstat -antp" to see what is listening and/or bogging down.
3 - Check "lsof" to see what the system is doing.
4 - Are you accessing SSH via SSH forwarding, a different place/network or VPN? This could be a MTU issue.
5 - Run "nmap $servername" from your system to check what is available and listening.
6 - Look in your logs for security issues; specifically access attempts to open ports; firewall to only allow source and destination for SSH, DNS or other Mail as appropriate.
8 - Use a ping from your system to the server to see if you can see latency.
9 - Use a traceroute/tracert to see latency between any hop.
Use the Source my friend!
When I check the disks, I get
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 182G 42G 131G 25% /
tmpfs 505M 0 505M 0% /lib/init/rw
udev 500M 140K 500M 1% /dev
tmpfs 505M 0 505M 0% /dev/shm
/dev/sdb1 230G 146G 72G 67% /mnt/sdb
So I am not running out of disk space.
When I run top, I get this output:
Tasks: 90 total, 3 running, 87 sleeping, 0 stopped, 0 zombie
Cpu(s): 7.0%us, 3.0%sy, 0.0%ni, 82.7%id, 6.6%wa, 0.3%hi, 0.3%si, 0.0%st
Mem: 1032748k total, 1013748k used, 19000k free, 242992k buffers
Swap: 2017272k total, 1040k used, 2016232k free, 473584k cached
So I am not running a process that is taking over the CPU.
How should I go about diagnosing this problem?
Thanks!
Mark
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