Re: load balancing two qmail servers using nfs
you might consider using rsync to sync your conffiles, instead of sharing them over nfs. this would eliminate alot of problems and latency i'd think. On 06/24/00 @ 12:11AM, Mike Denka wrote: I've got two qmail servers running inside a load balancer. They both access the same /var/mail/username/Maildir directories on an NFS server. They also share many of the same configuration files in /var/qmail/control on the NFS server. The files they share are local symbolic links to the shared volume on the NFS server. A few hours after bringing up the second qmail server, the first one, which had been running fine for two weeks, quit working. The errors I am getting in the syslog file on the failing server are "Can't_connect_to_SMTP_server" and "Can't_chdir_to_Maidir". Anyone have any success with this configuration or have any idea what could be causing the first server to loose its way? Running qmail and NFS on Solaris 2.7 (first server and NFS server) and 2.8 (second qmail server). The first server (the one failing) responds to connections on port 25 but can't send or deliver and is not spawning any qmail processes. The second server is now doing all the work. Thanks, Mike -- Steve J. Kondik [EMAIL PROTECTED] Stargate Industries, LLC - Network Operations Center
Re: load balancing two qmail servers using nfs
Mike, You might make sure that the UID/GIDs map the same on both servers and the NFS machine. i.e.- If the qmaild user is user 500 on the first server, but is a different UID number on the second server or the NFS machine you might have problems. Also, what do your tcpserver init scripts look like for both servers? They should be identical. Regards, Charles Werbick The Wirehouse Mike Denka writes: Hmmm . . . that's a good thought. I really hadn't considered using rsync since NFS seems to be working fine at least in terms of handling large mail volumes. But rsync would have some distinct advantages. However, I don't think that is the source of my problems because I had access problems getting to the control files when first setting up the server and the error messages in /var/log/syslog are pretty clear (e.g., "Can't_read_control", or something to that affect). Thanks for the rsyinc tip. I will try it out. Meanwhile, any other thoughts on why the second server suddenly cannot make smtp connections to the outside world or chdir to Mailbox? Mike -Original Message- From: steve j. kondik [mailto:[EMAIL PROTECTED]] Sent: Saturday, June 24, 2000 12:39 AM To: [EMAIL PROTECTED] Subject: Re: load balancing two qmail servers using nfs you might consider using rsync to sync your conffiles, instead of sharing them over nfs. this would eliminate alot of problems and latency i'd think. On 06/24/00 @ 12:11AM, Mike Denka wrote: I've got two qmail servers running inside a load balancer. They both access the same /var/mail/username/Maildir directories on an NFS server. They also share many of the same configuration files in /var/qmail/control on the NFS server. The files they share are local symbolic links to the shared volume on the NFS server. A few hours after bringing up the second qmail server, the first one, which had been running fine for two weeks, quit working. The errors I am getting in the syslog file on the failing server are "Can't_connect_to_SMTP_server" and "Can't_chdir_to_Maidir". Anyone have any success with this configuration or have any idea what could be causing the first server to loose its way? Running qmail and NFS on Solaris 2.7 (first server and NFS server) and 2.8 (second qmail server). The first server (the one failing) responds to connections on port 25 but can't send or deliver and is not spawning any qmail processes. The second server is now doing all the work. Thanks, Mike -- Steve J. Kondik [EMAIL PROTECTED] Stargate Industries, LLC - Network Operations Center
RE: load balancing two qmail servers using nfs
Both servers are NIS clients from the same master, which happens to be the NFS server. So the user information is identical across all machines involved. The tcpserver init scripts on the second machine were copied from the first machine, and so are also identical. Both good points, but not the problem, I'm afraid. Thanks, Mike -Original Message- From: chuck [mailto:[EMAIL PROTECTED]] Sent: Saturday, June 24, 2000 12:10 PM To: Mike Denka Cc: [EMAIL PROTECTED] Subject: Re: load balancing two qmail servers using nfs Mike, You might make sure that the UID/GIDs map the same on both servers and the NFS machine. i.e.- If the qmaild user is user 500 on the first server, but is a different UID number on the second server or the NFS machine you might have problems. Also, what do your tcpserver init scripts look like for both servers? They should be identical. Regards, Charles Werbick The Wirehouse Mike Denka writes: Hmmm . . . that's a good thought. I really hadn't considered using rsync since NFS seems to be working fine at least in terms of handling large mail volumes. But rsync would have some distinct advantages. However, I don't think that is the source of my problems because I had access problems getting to the control files when first setting up the server and the error messages in /var/log/syslog are pretty clear (e.g., "Can't_read_control", or something to that affect). Thanks for the rsyinc tip. I will try it out. Meanwhile, any other thoughts on why the second server suddenly cannot make smtp connections to the outside world or chdir to Mailbox? Mike -Original Message- From: steve j. kondik [mailto:[EMAIL PROTECTED]] Sent: Saturday, June 24, 2000 12:39 AM To: [EMAIL PROTECTED] Subject: Re: load balancing two qmail servers using nfs you might consider using rsync to sync your conffiles, instead of sharing them over nfs. this would eliminate alot of problems and latency i'd think. On 06/24/00 @ 12:11AM, Mike Denka wrote: I've got two qmail servers running inside a load balancer. They both access the same /var/mail/username/Maildir directories on an NFS server. They also share many of the same configuration files in /var/qmail/control on the NFS server. The files they share are local symbolic links to the shared volume on the NFS server. A few hours after bringing up the second qmail server, the first one, which had been running fine for two weeks, quit working. The errors I am getting in the syslog file on the failing server are "Can't_connect_to_SMTP_server" and "Can't_chdir_to_Maidir". Anyone have any success with this configuration or have any idea what could be causing the first server to loose its way? Running qmail and NFS on Solaris 2.7 (first server and NFS server) and 2.8 (second qmail server). The first server (the one failing) responds to connections on port 25 but can't send or deliver and is not spawning any qmail processes. The second server is now doing all the work. Thanks, Mike -- Steve J. Kondik [EMAIL PROTECTED] Stargate Industries, LLC - Network Operations Center
