Hey Kenneth - see, below. I've paired answers with your questions. On Wed, Sep 23, 2009 at 11:47 PM, Kenneth Burgener <[email protected]>wrote:
> My thoughts... > > On 9/23/2009 10:09 PM, William Attwood wrote: > > [Wed Sep 23 21:42:25 2009] [error] [client xx.xx.xx.xx] proxy: DNS lookup > > failure for: web1. domain.com returned by /file.php > > > > Is the web1.domain.com actually having to be resolved by a DNS server? > Maybe the DNS server is being overloaded. Try putting the > web1.domain.com in the /etc/hosts file. > It is in the hosts file. > > > [Wed Sep 23 21:42:47 2009] [error] (70007)The timeout specified has > expired: > > proxy: HTTP: attempt to connect to 10.3.1.30:80 (web1. domain.com) > failed > > [Wed Sep 23 21:42:47 2009] [error] ap_proxy_connect_backend disabling > worker > > for (web1. domain.com) > > This would seem to imply that your web1 server did not respond to the > proxy in a timley manner. Is your web1 server overloaded? Do you have > a buggy, or overloaded, application that is having difficulties in > responding within 300 seconds? What is the your ProxyTimeout directive > set to? If ProxyTimeout is not set, what is your Apache TimeOut value > set to? > There is zero loss on ICMP requests between the servers when these errors occur. > > > The other possibility, if you are getting a lot of traffic, is you have > hit some of the default connection limits. > We are set to 1000 Apache processes and using keepalive. We are at between 100 and 200 when these errors occur. > > Which version of apache are you running? > Server version: Apache/2.2.3 Server built: May 10 2009 11:14:03 > Which distribution are you using and which kernel version? > RHEL 5 > > What are your max file descriptors set to: (includes sockets) > /sbin/sysctl fs.file-max > fs.file-max = 356881 > What are your current file descriptor limit set to: (includes sockets) > ulimit -n > 1024 > > > > > Kenneth > > > > > > > > > /* > PLUG: http://plug.org, #utah on irc.freenode.net > Unsubscribe: http://plug.org/mailman/options/plug > Don't fear the penguin. > */ > -- Take care, William Attwood Idea Extraordinaire [email protected] Ted Turner <http://www.brainyquote.com/quotes/authors/t/ted_turner.html> - "Sports is like a war without the killing." /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
