From: [EMAIL PROTECTED] To: "Stephane Raimbault" <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] Subject: Re: Error 49, socket problem? Date: Thu, 14 Oct 2004 10:46:58 +0900
At Wed, 13 Oct 2004 09:36:03 -0600, Stephane Raimbault wrote: > > I doubt it's a DoS attack, however it could very well be. >
Well, probably not, given what you told us below.
> In this particular setup, apache runs on port 80 and 81. A slimed down
> version of apache handles basic http requests on port 80 and on port 81, we
> have a beefier version of apache with php running applications. We proxy
> the request from port 80 to port 81 so the client only ever sees connections
> to port 80.
>
> What I find strange is other applications on the server freak out when this
> is happening in the same manner. such as php not able to make mysql
> connections with a similar error. The errors aren't limited to 127.0.0.1
> either, it seems to be an overall problem with the box, not specifically the
> loopback or apache.
>
> PHP Warning: mysql_connect(): Can't connect to MySQL server on
> 'dbm.xxx.xxx.com' (49) in /www/index.php on line 4060
>
> In this case the above dbm.xxx.xxx.com resolves to 10.0.12.22 which is one
> of the MySQL server's in the cluster.
>
> I've ruled out that it's a problem with the MySQL server in this case,
> because I have 4 other web servers (running apache) able to connect to that
> MySQL server during the same time. All web servers in this cluster seem to
> exhibit the error randomly at diffrent times. Not only during high peak
> traffic times as previously thought.
>
> Are there buffers I could be running out of? What should I be checking?
> Perhaps something in sysctl... If I know what I should probably be looking
> at, I can probably monitor and have certain variables logged / graphed for a
> better idea of what is going on.
>
What version of FreeBSD are you running?
% uname -r 4.9-RELEASE-p11
I would check the interfaces (ifconfig -a), routing table (netstat -rn), and then the rest of the network statistics (man netstat) when this happens. Does it happen reliably or intermittently?
I will see if I can write a script that can be triggered when the errors occur. The errors are randomly intermittent.
Later, George
Thanks, Stephane.
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