[Dovecot] Dovecot 2, Imap service, client_limit
I see back in November of last year, a thread about using client_limit in the imap service (not imap-login) that would allow each imap process serve more than one connection. Sounded good, until I tried it!
When I did, unlike the OP of that thread, I got:
dovecot: imap(submit.user): Fatal: setuid(503(submit.user) from userdb lookup) failed with euid=501(links): Operation not permitted (This binary should probably be called with process user set to 503(submit.user) instead of 501(links))
So, it would appear that this does not work. Still, the thread was posting results of their testing even that showed it worked.
Sample message within the thread, read for more:
http://www.dovecot.org/list/dovecot/2010-November/054893.html
I'd love to be able to use a single imap process for more than one connection. Is this still possible, or, not? If so, how?
Steve
On Tue, Jul 19, 2011 at 3:56 PM, Steve Fatula <compconsultant@yahoo.com> wrote:
I see back in November of last year, a thread about using client_limit in the imap service (not imap-login) that would allow each imap process serve more than one connection. Sounded good, until I tried it!
When I did, unlike the OP of that thread, I got:
dovecot: imap(submit.user): Fatal: setuid(503(submit.user) from userdb lookup) failed with euid=501(links): Operation not permitted (This binary should probably be called with process user set to 503(submit.user) instead of 501(links))
So, it would appear that this does not work. Still, the thread was posting results of their testing even that showed it worked.
Sample message within the thread, read for more:
http://www.dovecot.org/list/dovecot/2010-November/054893.html
I'd love to be able to use a single imap process for more than one connection. Is this still possible, or, not? If so, how?
Steve
In my case, we use a single shared user for all mailboxes, so there's no UID issue. The imap process is always running as that one UID, so it doesn't ever try to setuid to something else.
Timo, is there some way/setting to only let client_limit != 1 apply to processes running as the same user? I.e. if a imap process (with client_limit > 1) was running as UID 501 (to use the OP's uids), and imap-login needed to send UID 503 to an imap process, it wouldn't send it to the one running as UID 501, but rather either create new imap proc or if UID 503 already had a imap proc running, then send UID 503 to that one. (I realize that makes almost no grammatical sense, but hopefully you know what I mean).
Mark Moseley <moseleymark <at> gmail.com> writes:
Timo, is there some way/setting to only let client_limit != 1 apply to processes running as the same user? I.e. if a imap process (with client_limit > 1) was running as UID 501 (to use the OP's uids), and imap-login needed to send UID 503 to an imap process, it wouldn't send it to the one running as UID 501, but rather either create new imap proc or if UID 503 already had a imap proc running, then send UID 503 to that one.
That would be wonderful since then, clients with 5 connections say, would all go to one imap process instead of 5.
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-----Original Message----- From: dovecot-bounces@dovecot.org [mailto:dovecot-bounces@dovecot.org] On Behalf Of Mark Moseley Sent: Wednesday, July 20, 2011 4:38 AM Cc: dovecot@dovecot.org Subject: Re: [Dovecot] Dovecot 2, Imap service, client_limit
On Tue, Jul 19, 2011 at 3:56 PM, Steve Fatula <compconsultant@yahoo.com> wrote:
I see back in November of last year, a thread about using client_limit
in the imap service (not imap-login) that would allow each imap process serve more than one connection. Sounded good, until I tried it!
When I did, unlike the OP of that thread, I got:
dovecot: imap(submit.user): Fatal: setuid(503(submit.user) from userdb
lookup) failed with euid=501(links): Operation not permitted (This binary should probably be called with process user set to 503(submit.user) instead of 501(links))
So, it would appear that this does not work. Still, the thread was posting results of their testing even that showed it worked.
Sample message within the thread, read for more:
http://www.dovecot.org/list/dovecot/2010-November/054893.html
I'd love to be able to use a single imap process for more than one connection. Is this still possible, or, not? If so, how?
Steve
In my case, we use a single shared user for all mailboxes, so there's no UID issue. The imap process is always running as that one UID, so it doesn't ever try to setuid to something else.
Timo, is there some way/setting to only let client_limit != 1 apply to processes running as the same user? I.e. if a imap process (with client_limit > 1) was running as UID 501 (to use the OP's uids), and imap-login needed to send UID 503 to an imap process, it wouldn't send it to the one running as UID 501, but rather either create new imap proc or if UID 503 already had a imap proc running, then send UID 503 to that one. (I realize that makes almost no grammatical sense, but hopefully you know what I mean).
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participants (4)
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Guruprasad S N
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Mark Moseley
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Steve
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Steve Fatula