Date: Thu, 17 Sep 2009 08:49:49 -0400 From: Steve Bertrand <steve@ibctech.ca> To: "Michael K. Smith - Adhost" <mksmith@adhost.com> Cc: questions@freebsd.org Subject: Re: New mail server setup Message-ID: <4AB2306D.1070009@ibctech.ca> In-Reply-To: <17838240D9A5544AAA5FF95F8D52031606AFCA07@ad-exh01.adhost.lan> References: <4AB0584D.3050206@eagle.ca><4AB0844B.5080804@infracaninophile.co.uk><4AB0E97B.4060606@ibctech.ca><4AB0ECE8.2080905@infracaninophile.co.uk> <4AB0F17B.1030400@ibctech.ca> <17838240D9A5544AAA5FF95F8D52031606AFCA07@ad-exh01.adhost.lan>
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This is a cryptographically signed message in MIME format. --------------ms070601010501020207060104 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Michael K. Smith - Adhost wrote: >>> Steve Bertrand wrote: >>> >>>> If anyone has a setup that has redundancy for their IMAP/POP >> services, >>>> and a method to keep the changing data relatively up-to-date, I'd >> love >>>> to hear about it. [ big snip ] > Another approach would be a cluster of Postfix servers and Dovecot > servers behind PF load balancers. We have 3 "POP" servers (IMAP/POP), 9 > Mail Servers, 2 Defer servers and 5 Filter servers that process over 20 > million messages a day without a blip. We can take individual servers > out of the pool for maintenance, etc. Everything is fed to a set of > redundant NAS for the data storage and common configuration files. Thanks Mike, I'm interested to learn a little more about your setup. I was going to take it off-list, but if you can provide some further details, it would probably add long-term value to keep it here. So, a couple of questions: - can your PF load balancers 'sense' when one of the Postfix/Dovecot units are down, or is this a manual change in config to prevent any time-out conditions? I like this load balancer idea. In my environment, it would be trivial to set up a couple of them, throw Quagga on them, and integrate them directly into our iBGP setup. On the other side, I could use VRRP or the like to ensure redundancy from front to back. - do the Postfix/Dovecot servers communicate with each other, or are they simply stand-alone units that don't know/care that they have other peers helping with the workload? - are your filter servers in front of, or behind the load balancers (iow, is all of your inbound email passed through the balancers, and then filtered/processed/delivered in behind them)? - how do all of the pieces communicate with the NAS...NFS? - could you share a small snip of your PF config in relation to load-balancing, so I can get a bit of a better understanding config-wise on how that piece hangs together? (I've never used PF, only IFPW ;) Thanks, and regards, Steve --------------ms070601010501020207060104 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIII/zCC AtowggJDoAMCAQICEEs5xg/J3t77QWJ4SatV1HcwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA5MDUwNzIzMTYxMFoX DTEwMDUwNzIzMTYxMFowQjEfMB0GA1UEAxMWVGhhd3RlIEZyZWVtYWlsIE1lbWJlcjEfMB0G CSqGSIb3DQEJARYQc3RldmVAaWJjdGVjaC5jYTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBAJSTRAjP1RVa87/mnZn+PBTbENgyhhBJ4rWApmaNcthzRdk2DB/49KrXx3EQP60w Lj4KU0DFkiGNVj9BnVxRAx/WDXKxGC3uGGEG6gjyWv8KFMWMsH9mL7y7uNow1HueT6pZUf9o yY8Ewd+01QpGi7FfXOae7lGHhbEwnEJGwz08ytRfLmH0KtEzlZanZZhwDGX5s1kIHnyxdACh 3byXY6Z2bOrx0rcrQHCnHJppxddR60F7igjaMuBFstE51h9XTgXDNKJbglqTug5ghGihNuP6 VsBN7ue62y96UGIE22TvKEcAQ665vQGjHqZeSzZYy+hWNOa27pWFmhlqFjx0x8MCAwEAAaMt MCswGwYDVR0RBBQwEoEQc3RldmVAaWJjdGVjaC5jYTAMBgNVHRMBAf8EAjAAMA0GCSqGSIb3 DQEBBQUAA4GBAMOmjxjp2Xzk6ZHLwTgFDzVhm98RjRT3UXotKjNIR7SgwfWF5wkJrx4I+dXu ui5ztMEq4bTTRgJ344MqE6uZiZlg+tBIFHZGCJfKdzsX4QuV2jmw0sR5dMaYxG6tlDB0YUMv gTqzV7ZDpiusTMOZe9pP1PdxFhOcIJXtMQDj5LhuMIIC2jCCAkOgAwIBAgIQSznGD8ne3vtB YnhJq1XUdzANBgkqhkiG9w0BAQUFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3Rl IENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0EwHhcNMDkwNTA3MjMxNjEwWhcNMTAwNTA3MjMxNjEwWjBCMR8wHQYD VQQDExZUaGF3dGUgRnJlZW1haWwgTWVtYmVyMR8wHQYJKoZIhvcNAQkBFhBzdGV2ZUBpYmN0 ZWNoLmNhMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlJNECM/VFVrzv+admf48 FNsQ2DKGEEnitYCmZo1y2HNF2TYMH/j0qtfHcRA/rTAuPgpTQMWSIY1WP0GdXFEDH9YNcrEY Le4YYQbqCPJa/woUxYywf2YvvLu42jDUe55PqllR/2jJjwTB37TVCkaLsV9c5p7uUYeFsTCc QkbDPTzK1F8uYfQq0TOVlqdlmHAMZfmzWQgefLF0AKHdvJdjpnZs6vHStytAcKccmmnF11Hr QXuKCNoy4EWy0TnWH1dOBcM0oluCWpO6DmCEaKE24/pWwE3u57rbL3pQYgTbZO8oRwBDrrm9 AaMepl5LNljL6FY05rbulYWaGWoWPHTHwwIDAQABoy0wKzAbBgNVHREEFDASgRBzdGV2ZUBp YmN0ZWNoLmNhMAwGA1UdEwEB/wQCMAAwDQYJKoZIhvcNAQEFBQADgYEAw6aPGOnZfOTpkcvB OAUPNWGb3xGNFPdRei0qM0hHtKDB9YXnCQmvHgj51e66LnO0wSrhtNNGAnfjgyoTq5mJmWD6 0EgUdkYIl8p3OxfhC5XaObDSxHl0xpjEbq2UMHRhQy+BOrNXtkOmK6xMw5l72k/U93EWE5wg le0xAOPkuG4wggM/MIICqKADAgECAgENMA0GCSqGSIb3DQEBBQUAMIHRMQswCQYDVQQGEwJa QTEVMBMGA1UECBMMV2VzdGVybiBDYXBlMRIwEAYDVQQHEwlDYXBlIFRvd24xGjAYBgNVBAoT EVRoYXd0ZSBDb25zdWx0aW5nMSgwJgYDVQQLEx9DZXJ0aWZpY2F0aW9uIFNlcnZpY2VzIERp dmlzaW9uMSQwIgYDVQQDExtUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgQ0ExKzApBgkqhkiG 9w0BCQEWHHBlcnNvbmFsLWZyZWVtYWlsQHRoYXd0ZS5jb20wHhcNMDMwNzE3MDAwMDAwWhcN MTMwNzE2MjM1OTU5WjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRp bmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3Vp bmcgQ0EwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMSmPFVzVftOucqZWh5owHUEcJ3f 6f+jHuy9zfVb8hp2vX8MOmHyv1HOAdTlUAow1wJjWiyJFXCO3cnwK4Vaqj9xVsuvPAsH5/Ef kTYkKhPPK9Xzgnc9A74r/rsYPge/QIACZNenprufZdHFKlSFD0gEf6e20TxhBEAeZBlyYLf7 AgMBAAGjgZQwgZEwEgYDVR0TAQH/BAgwBgEB/wIBADBDBgNVHR8EPDA6MDigNqA0hjJodHRw Oi8vY3JsLnRoYXd0ZS5jb20vVGhhd3RlUGVyc29uYWxGcmVlbWFpbENBLmNybDALBgNVHQ8E BAMCAQYwKQYDVR0RBCIwIKQeMBwxGjAYBgNVBAMTEVByaXZhdGVMYWJlbDItMTM4MA0GCSqG SIb3DQEBBQUAA4GBAEiM0VCD6gsuzA2jZqxnD3+vrL7CF6FDlpSdf0whuPg2H6otnzYvwPQc UCCTcDz9reFhYsPZOhl+hLGZGwDFGguCdJ4lUJRix9sncVcljd2pnDmOjCBPZV+V2vf3h9bG CE6u9uo05RAaWzVNd+NWIXiC3CEZNd4ksdMdRv9dX2VPMYIDZDCCA2ACAQEwdjBiMQswCQYD VQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UE AxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEEs5xg/J3t77QWJ4SatV 1HcwCQYFKw4DAhoFAKCCAcMwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0B CQUxDxcNMDkwOTE3MTI0OTQ5WjAjBgkqhkiG9w0BCQQxFgQUK2PLYNbkuHvL6gSluhVDL97a 7VQwUgYJKoZIhvcNAQkPMUUwQzAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZI hvcNAwICAUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgYUGCSsGAQQBgjcQBDF4MHYwYjEL MAkGA1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAq BgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAhBLOcYPyd7e+0Fi eEmrVdR3MIGHBgsqhkiG9w0BCRACCzF4oHYwYjELMAkGA1UEBhMCWkExJTAjBgNVBAoTHFRo YXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBG cmVlbWFpbCBJc3N1aW5nIENBAhBLOcYPyd7e+0FieEmrVdR3MA0GCSqGSIb3DQEBAQUABIIB AA/Rgulay2EUnBqcRjWFxgwkLQUl+hXeGjZI2C+t0mrcqfLnyOZ8dKFnjfdz5zsTkv4GkWTg 6Qlp4Wi6izzciJ7xR1UXeWf8viawMXjLON9K6mV1Fujt4Ntoth/36dEb58b/KbbJZnkiVAzT XnNaatBJK0gDMeTcueotI3f3037VddxxmcqG1YXGA9GE10AdGsKKvYjfMlOLh1rsAg5MfSrq t7QuI0eRvZGzxKfP9J8uq+M5dztnn0TnAYxx2GjLE8915tvrsXYCBiWYZpW9HGD9MZIFvPhY vX+py3+Yk50Ba2pvxJDwTiV97z95W7KDvuBEf8WiXpqVLVvdcjH6JScAAAAAAAA= --------------ms070601010501020207060104--
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