Frank Elsner
2007-Dec-13 13:15 UTC
[Dovecot] SYN flooding / pipe() failed: Too many open files
Hello *,
I've the following problem with dovecot 1.0.7:
/var/log/messages shows
| Dec 13 13:48:27 mailbox kernel: possible SYN flooding on port 143. Sending
cookies.
and /var/log/maillog shows (Please note: nearly the same time):
| Dec 13 13:48:28 mailbox dovecot: pipe() failed: Too many open files
This leads to an unresponsive mail service and requires a dovecot restart.
What can be done to prevent this?
BTW, this is my dovecot -n:
# 1.0.7: /usr/local/dovecot/etc/dovecot.conf
base_dir: /var/run/dovecot/
protocols: imap imaps pop3 pop3s
ssl_cert_file: /usr/local/dovecot/etc/mailbox.pem
ssl_key_file: /usr/local/dovecot/etc/mailbox.key
disable_plaintext_auth: no
login_dir: /var/run/dovecot//login
login_executable(default): /usr/local/dovecot/libexec/dovecot/imap-login
login_executable(imap): /usr/local/dovecot/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3-login
login_greeting: TU-Berlin.DE POP3-/IMAP Service ready
login_log_format_elements: %u %r %c
login_processes_count: 24
login_max_processes_count: 512
verbose_proctitle: yes
mail_location: maildir:/var/Mail/Boxes/%1u/%u
mailbox_idle_check_interval: 15
maildir_copy_with_hardlinks: yes
maildir_copy_preserve_filename: yes
mail_executable(default): /usr/local/dovecot/libexec/dovecot/imap
mail_executable(imap): /usr/local/dovecot/libexec/dovecot/imap
mail_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/local/dovecot/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/dovecot/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/dovecot/lib/dovecot/pop3
mail_log_prefix: %Ls(%u):
imap_client_workarounds(default): delay-newmail outlook-idle netscape-eoh
tb-extra-mailbox-sep
imap_client_workarounds(imap): delay-newmail outlook-idle netscape-eoh
tb-extra-mailbox-sep
imap_client_workarounds(pop3): outlook-idle
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
mechanisms: plain login anonymous
count: 32
passdb:
driver: ldap
args: /usr/local/dovecot/etc/dovecot-ldap.conf
userdb:
driver: static
args: uid=777 gid=12
plugin:
quota: maildir:ignore=Trash
Kind regards ______________________________________________________________
Frank Elsner / c/o Technische Universitaet Berlin |
____________/ tubIT [BD], Sekr. E-N 50 |
| Einsteinufer 17 |
| Phone: +49 30 314 23897 D-10587 Berlin |
| eMail: Frank.Elsner at TU-Berlin.DE Germany
__________________|
|_________________________________________________________| in dubio pro exim
Charles Marcus
2007-Dec-13 13:21 UTC
[Dovecot] SYN flooding / pipe() failed: Too many open files
On 12/13/2007, Frank Elsner (Frank.Elsner at TU-Berlin.DE) wrote:> and /var/log/maillog shows (Please note: nearly the same time): > > | Dec 13 13:48:28 mailbox dovecot: pipe() failed: Too many open filesDidn't 1.0.9 fix this? -- Best regards, Charles
Timo Sirainen
2007-Dec-13 13:29 UTC
[Dovecot] SYN flooding / pipe() failed: Too many open files
On Thu, 2007-12-13 at 14:15 +0100, Frank Elsner wrote:> | Dec 13 13:48:28 mailbox dovecot: pipe() failed: Too many open files..> login_max_processes_count: 512One fd is required for each child process. Your ulimit -n was probably too low when starting Dovecot. v1.1 warns about this at startup. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://dovecot.org/pipermail/dovecot/attachments/20071213/7777d43c/attachment-0002.bin>