May 2013 - dovecot - dovecot.org

[Dovecot] Slow DNS warnings (proxy/auth)
by Christian Balzer 02 May '13

02 May '13

Hello, I've just finished transiting our proxies from perdition to dovecot (2.1.7-7 Debian). Yesterday 12 messages (all within the same second) like this caught my attention: --- Apr 25 17:19:09 pp11 dovecot: auth: Warning: proxy(redacted(a)gol.com,xx.xx.xx.xx,<26hUEivbfQBlMrMS>): DNS lookup for mb04.dentaku.gol.com took 5.002 s --- Now this machine at that time was handling a load of about 2 logins per second, about 20% of what it previously handled with perdition w/o a hiccup. It also runs a local caching nameserver and the A record for the mailbox server in question was most definitely cached at the time (verified via TTL). The machine in question was very bored and certainly capable of handling hundreds if not thousands of DNS queries per second at that moment. In short, I can't see any reason how the lookup could have taken so long, so my guess is there are some issues with the dns-helper (locking, stepping on each others feet, not being spawned fast enough) causing this. Some general remarks, dovecot as proxy feels "heavier" than perdition. In the CPU area that's probably a more subjective impression, because all the little helper processes make it clear what's going on where. Though the "config" process being rather active is something that perdition definitely doesn't do, it reads the config once at start time and that's it. All the IPC and central processes of course also make dovecot rather file handle hungry. Memory wise it's about 35% bigger than perdition and that's not subjective at all. ^o^ About one MB per proxy process/connection for dovecot in my case. Caveat emptor. ^o^ Regards, Christian -- Christian Balzer Network/Systems Engineer chibi(a)gol.com Global OnLine Japan/Fusion Communications http://www.gol.com/

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Re: [Dovecot] XFS vs EXT4 for mail storage
by Reindl Harald 02 May '13

02 May '13

Am 02.05.2013 17:31, schrieb Charles Marcus: > On 2013-05-02 10:45 AM, Reindl Harald <h.reindl(a)thelounge.net> wrote: >> "man mount" is very generic and doe snot cover any option >> there is also no "man mount.ntfs" while "mount.ntfs" command exists > > ? > > man mount, at least mine, shows first the FILESYSTEM INDEPENDENT MOUNT OPTIONS, then as you scroll down, you'll get > to all of the additional filesystem specific options, ie, for xfs... > > So, not sure what you mean by 'does not cover any option'... typo - meant "does not cover ALL options" someone has to write the manpages, there are millions of options all over the software-world which did it not make into manpages google for "xfs delaylog" leads to http://xfs.org/index.php/XFS_FAQ http://xfs.org/index.php/XFS_FAQ#Q:_I_want_to_tune_my_XFS_filesystems_for_.… For mount options, the only thing that will change metadata performance considerably are the logbsize and delaylog mount options so how can it be redhat-specific if it is mentioned upstream?

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[Dovecot] NTLM authentication with Outlook 2010
by Kevin Bridges 01 May '13

01 May '13

All, I have a Ubuntu 12.04.2 box running Dovecot 2.0.19. I have it configured for our active directory. WBinfo and ntlm_auth work great. I am trying to get sso to work with ntlm. Gssapi with thunderbird works like it should. I just cant get ntlm with outlook 2010 to work for sso. I get prompted for my password each time I open outlook. I have attached my config for dovecot. Any help would be much appreciated. # 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-39-virtual x86_64 Ubuntu 12.04.2 LTS auth_debug = yes auth_debug_passwords = yes auth_mechanisms = gssapi ntlm auth_use_winbind = yes auth_verbose = yes auth_verbose_passwords = plain debug_log_path = /var/log/dovecot_debug.log log_path = /var/log/dovecot.log mail_location = mdbox:~/mdbox passdb { driver = pam } plugin { quota_rule = *:storage=2G quota_warning = storage=95%% quota-warning 95 %u } protocols = " imap" service auth-worker { user = root } service auth { user = root } ssl_cert = </etc/ssl/certs/dovecot.pem ssl_key = </etc/ssl/private/dovecot.pem userdb { driver = passwd } protocol imap { mail_plugins = " quota imap_quota" }

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