Server Connection Loss

carlosinfl · 02-23-2009, 02:17 PM

I can't understand what is causing me to constantly lose connection with a new server I just build on my LAN. I created a new server:

OS = CentOS 5.2 x64
Hostname = mysql.domain.com
IP = 192.168.0.78
SM = 255.255.0.0
GW = 192.168.0.1
Static IP

Every 30 minutes the server has a connection issue as my SSH session to that machine is frozen. I can't see the page Apache is running nor can I ping that machine from my box. Now when I login to the machine directly via the console or just run a 'ls -l' from the console of that server, it suddenly comes back to life and everything works for a limited period of time. This is driving my nuts. I need this to be a production machine and I don't know what is causing this. I have re-imaged the machine so that leads me to beleive its something more serious. I replaced the Cat5e cable, I have no problems connecting for days/months to servers connecting to the same switch / subnet as the server in question.

Anyone have any suggestions?

kentyler · 02-24-2009, 07:19 AM

Check what mii-tool shows to see if you have a 100full connection. Also what is the output of ifconfig? Are there any errors? Did you check the log for apm events?

carlosinfl · 02-24-2009, 08:43 AM

I have never used 'mii-tool' before. Am I doing it wrong?

Code:

[root@mysql log]# mii-tool
SIOCGMIIPHY on 'eth0' failed: Operation not supported
SIOCGMIIPHY on 'eth1' failed: Operation not supported
no MII interfaces found

Here is my 'ifconfig' output:

Code:

[root@mysql ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:13:72:69:AF:34  
          inet addr:192.168.0.78  Bcast:192.168.255.255  Mask:255.255.0.0
          inet6 addr: fe80::213:72ff:fe69:af34/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:49586 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21323 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7459556 (7.1 MiB)  TX bytes:3562816 (3.3 MiB)
          Base address:0xdcc0 Memory:fe7e0000-fe800000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:26 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1988 (1.9 KiB)  TX bytes:1988 (1.9 KiB)

I am looking in /var/log/ and don't see anything particular that helps me. I really don't see anything for 'apm' just listed in /var/log...

theNbomr · 02-24-2009, 11:03 AM

Just speculation, but it sounds like the system may be going into some kind of 'sleep' mode due to lack of activity on the local console/desktop. You might consider researching ACPI online for some clues.
--- rod.