Hi

I am running quite a few redhat 8 servers and sometimes they start to really grind when asked for a TCP/IP connection. I have a mysql server and it takes 30 seconds to connect to it.

I've turned IPTables off, but in any event it had no packet matching enabled, so it shouldn't have affected it.

When I run netstat, it sits there for about 30 - 60 seconds and then spits all of the information out in one go.

The servers seem to go slow, and a reboot doesn't speed them up. They seem to get better by themselves.

gnome-system-monitor is saying that the CPU usage is about 0 - 2 % while I'm waiting for these connections.

I have tried restarting the xinetd and networking itself, but to no avail.

Once a connection is made, there are no problems. The machines are different types, but they all run redhat 8.

Please help!! I'm having real problems

Welcome to LQ.

From what you are saying it could be a dns problem, perhaps you are logging all requests and the services are trying to lookup dns entries for all the connecting hosts, this could delay a connection if the dns is slow to respond.

The next time you see the connections becoming slow put your IP address next to a host entry in the servers hosts file and see if it speeds the connections up for you compared to everyone else. Note that the IP you need to use is the one you identify your self with to the server, this may not be your private IP address.

My friend,

You are an absolute life saver. Thank you very much indeed

No problem - I assume that it was DNS?

Yes it was. Populating /etc/hosts is something that I hadn't got round to because (stupidly) i assumed that things wouldn't do a DNS query on a private address. But obviously if you have an internal DNS server then it will.