[ale] Sendmail latency
Ryan Fish
FishR at bellsouth.net
Mon Jan 24 23:20:04 EST 2005
> > Make sure that the order is files,dns when you
> > "grep hosts /etc/resolv.conf"
>
> - This results in no output on either server. I know what you are looking
> for though but cannot remember the file to look in at this time...
Were you wanting me to look in /etc/nsswitch.conf instead?
[root at mailserver mail]# grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
hosts: files dns
[root at appserver etc]# grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
hosts: files dns
----- Original Message -----
From: "Ryan Fish" <FishR at bellsouth.net>
To: "Atlanta Linux Enthusiasts" <ale at ale.org>
Sent: Monday, January 24, 2005 11:08 PM
Subject: Re: [ale] Sendmail latency
> > You are correct that sendmail (mail in general too) is heavily dependent
> > upon dns. Ping alone doesn't necessarily test dns. Can you 'host' each
> > machine name and ip successfully?
>
> - When I 'host' the app server from the mail server I only receive
> 192.168.3.0
> - When I 'host' the mail server from the app server I receive the full,
> proper IP address
>
> > Make sure that the order is files,dns when you
> > "grep hosts /etc/resolv.conf"
>
> - This results in no output on either server. I know what you are looking
> for though but cannot remember the file to look in at this time...
>
> > How many emails does the java applet send at once? Are we talking
> > hundreds or thousands?
>
> - Thousands. When I spoke with the client around 8:30P EST tonight there
> were 7500 msgs in the queue used by the Java app on the App server.
> Typically that queue is cleared almost instantly.
>
> > what does 'ps ax | grep sendmail' show?
>
> [root at mailserver root]# ps ax|grep sendmail
> 32048 ? S 4:30 sendmail: accepting connections
> 32057 ? S 0:00 sendmail: Queue runner at 01:00:00 for
> /var/spool/clientmqueue
> 31503 ? S 0:02 sendmail: ./j0L4smUO025948 from queue
> 5617 ? S 0:00 sendmail: ./j0M6rU5i028191 imail.ouhsc.edu.:
user
> open
> 9155 ? S 0:00 sendmail: server [222.175.4.226] cmd read
> 12490 ? S 0:00 sendmail: ./j0O1BNgI002698 angelfire.com.: user
> open
> 15160 ? S 0:00 sendmail: server
> host81-152-84-182.range81-152.btcentralplus.com [81.152.84.182] cmd read
> 15236 ? S 0:00 sendmail: j0P3iEAw015236 216-91-89-130.isp.com
> [216.91.89.130]: MAIL FROM
> 15239 ? S 0:00 sendmail: j0P3iHkj015239 216-91-89-130.isp.com
> [216.91.89.130]: MAIL FROM
> 15242 ? S 0:00 sendmail: j0P3i3dd015221 app02.clientdomain.com
> [192.168.3.220]: DATA
> 15243 ? S 0:00 sendmail: j0P3iD2a015243 app02.clientdomain.com
> [192.168.3.220]: MAIL FROM
> 15248 ? S 0:00 sendmail: startup with 216-91-89-130.isp.com
> 15249 ? S 0:00 sendmail: startup with 216-91-89-130.isp.com
> 15256 pts/2 S 0:00 grep sendmail
>
>
> [root at appserver etc]# ps ax|grep sendmail
> 1453 ? S 0:34 sendmail: accepting connections
> 1462 ? S 0:00 sendmail: Queue runner at 01:00:00 for
> /var/spool/clientmqueue
> 4416 pts/4 S 0:00 grep sendmail
>
>
>
>
> ----- Original Message -----
> From: "Jim Popovitch" <jimpop at yahoo.com>
> To: "Atlanta Linux Enthusiasts" <ale at ale.org>
> Sent: Monday, January 24, 2005 10:08 PM
> Subject: Re: [ale] Sendmail latency
>
>
> > You are correct that sendmail (mail in general too) is heavily dependent
> > upon dns. Ping alone doesn't necessarily test dns. Can you 'host' each
> > machine name and ip successfully?
> >
> > Make sure that the order is files,dns when you
> > "grep hosts /etc/resolv.conf"
> >
> > How many emails does the java applet send at once? Are we talking
> > hundreds or thousands?
> >
> > What format is the email delivered (via the transport class) to the
> > mailserver? Is it direct SMTP or file based?
> >
> > what does 'ps ax | grep sendmail' show?
> >
> > -Jim P.
> >
> > On Mon, 2005-01-24 at 21:50 -0500, Ryan Fish wrote:
> > > Mail server info:
> > > RHEL 3 ES
> > > 2.4.21-27.0.1.ELsmp
> > > sendmail-8.12.11-4.RHEL3.1
> > >
> > > App server info:
> > > RHEL 3 ES
> > > 2.4.21-27.0.1.ELsmp
> > >
> > > The app server dumps messages from a Java API to the mail server using
> > > a transport class. Sendmail is supposed to then pick up the msgs and
> > > send them on their way. However, for the past 10 days sendmail has
> > > been VERY latent in sending these msgs. 10 days ago I rebooted this
> > > app server and three others just like it early in the morning after
> > > installing several updates via up2date. A few hours later when I made
> > > it to the office I found that no mail was being delivered by the mail
> > > server at all. I would receive transient parse errors ("Transient
> > > parse error -- message queued for future delivery") when attempting to
> > > send via the cmd line. I got it going again by starting named on the
> > > three internal servers listed in /etc/resolv.conf on the mail server.
> > > It was still slow to deliver messages but I attributed this to the
> > > backup in the queue since nothing had been sent anywhere for over four
> > > hours. Anyway, mail is still very latent when the Java app dumps its
> > > messages to the mail server so, in my mind, it appears there is some
> > > form of a DNS resolution issue on the part of the mail server which is
> > > causing the hold up. As I am still very new at everything and have
> > > been thrown into my position (I learn best under fire but must ask
> > > tons of questions...) I am in serious need of help with this. I wish
> > > I could offer more info but I really don't know where to start.
> > >
> > > based on the output of 'netstat -an | grep :110', 'netstat -an |
> > > grep :25' and 'netstat -part | grep sendmail' it does not appear the
> > > mail server is being hit by a DOS attack or anything of that nature.
> > >
> > > /var/log/maillog doesn't appear to have anything out of the ordinary.
> > > When I tail it in real time I see msgs flowing through the box
> > > constantly.
> > >
> > > I can successfully send mail from the cmd line with only a slight
> > > delay.
> > >
> > > I can successfully send mail through POP3 with a slightly longer
> > > delay.
> > >
> > > I can successfully send mail through the mail server while connected
> > > to it from another box in the same network via Telnet on port 25.
> > >
> > > I can successfully resolve the app server and the mail server from
> > > each other via ping.
> > >
> > >
> > > As stated before, I am not sure where to start with this so any help
> > > will be greatly appreciated.
> > >
> > > Thanks in advance.
> > >
> > > -Ryan
> > > _______________________________________________
> > > Ale mailing list
> > > Ale at ale.org
> > > http://www.ale.org/mailman/listinfo/ale
> >
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> >
>
>
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