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Patrick Westenberg

2017-Aug-23 11:10 UTC

socketpair failed: Too many open files on Debian 9

Hi @all,

after re-installing one of my two frontends/proxy-servers I get the
following error messages after some time (sometimes after 1h, sometimes
after 24h):


11:23:55 imap-login: Error: socketpair() failed: Too many open files
11:23:55 imap-login: Error: socketpair() failed: Too many open files
11:23:56 imap-login: Error: socketpair() failed: Too many open files
11:23:56 imap-login: Error: socketpair() failed: Too many open files
11:23:57 imap-login: Error: socketpair() failed: Too many open files

11:26:17 imap-login: Error: socket() failed: Too many open files
11:26:17 imap-login: Error: proxy(post at example.com): connect(172.17.1.1,
143) failed: Too many open files (after 0 secs):
user=<post at example.com>, method=PLAIN, rip=x.x.x.x, lip=x.x.x.x, TLS,
session=<FgPWTWhXa8dQjLoi>
11:26:17 imap-login: Error: socketpair() failed: Too many open files
11:26:17 imap-login: Error: proxy: SSL handshake failed to
172.17.1.1:143: user=<post at example.com>, method=PLAIN, rip=x.x.x.x,
lip=x.x.x.x, TLS, session=<HALWTWhXasdQjLoi>
11:26:17 imap-login: Error: socket() failed: Too many open files
11:26:17 imap-login: Error: proxy(post at example.com): connect(172.17.1.1,
143) failed: Too many open files (after 0 secs):
user=<post at example.com>, method=LOGIN, rip=x.x.x.x, lip=x.x.x.x, TLS,
session=<HALWTWhXasdQjLoi>
11:26:17 imap-login: Error: socketpair() failed: Too many open files
11:26:17 imap-login: Error: proxy: SSL handshake failed to
172.17.1.1:143: user=<post at example.com>, method=LOGIN, rip=x.x.x.x,
lip=x.x.x.x, TLS, session=<FgPWTWhXa8dQjLoi>
11:26:17 imap-login: Error: socket() failed: Too many open files


As I switched from KVM to LXC my first idea was that this could be
caused by LXC but this even happens with KVM.
I tried dovecot 2.2.31 and 2.2.32.rc2. OS is Debian 9.

These problems don't occur on my old machine (Debian 7).

Any ideas?

Regards
Patrick




# 2.2.32.rc2 (a350120ca): /usr/local/etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.19 (e5c7051)
# OS: Linux 4.4.67-1-pve x86_64 Debian 9.1
auth_mechanisms = plain login
director_mail_servers = 172.17.1.1 172.17.1.2
director_servers = 172.17.1.32 172.17.1.3
director_user_expire = 5 mins
lmtp_proxy = yes
log_path = /var/log/dovecot.log
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope
encoded-character vacation subaddress comparator-i;ascii-numeric
relational regex imap4flags copy include variables body enotify
environment mailbox date index ihave duplicate mime foreverypart extracttext
protocols = imap pop3 lmtp sieve
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    user = dovecot
  }
}
service director {
  fifo_listener login/proxy-notify {
    mode = 0666
  }
  inet_listener {
    address = 172.17.1.32
    port = 9090
  }
  unix_listener director-userdb {
    mode = 0600
  }
  unix_listener login/director {
    mode = 0666
  }
}
service imap-login {
  executable = imap-login director
  process_min_avail = 1
  service_count = 0
}
service lmtp {
  inet_listener lmtp {
    address = 172.17.1.32
    port = 24
    ssl = yes
  }
  process_min_avail = 20
}
service managesieve-login {
  executable = managesieve-login director
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  executable = pop3-login director
}
ssl_cert = </etc/ssl/certs/certum_wildcard.pem
ssl_cipher_list
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_dh_parameters_length = 2048
ssl_key =  # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
verbose_proctitle = yes
protocol !smtp {
  passdb {
    args = proxy=y nopassword=y starttls=any-cert
    driver = static
    name   }
}
protocol smtp {
  passdb {
    args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
    driver = sql
    name   }
  userdb {
    args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
    driver = sql
    name   }
}
protocol lmtp {
  auth_socket_path = director-userdb
}

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7978
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 7978
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited


###########################


This machine has no problems:

# 2.2.18: /usr/local/etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.8 (0c4ae064f307+)
# OS: Linux 3.16.0-0.bpo.4-amd64 x86_64 Debian 7.11
auth_mechanisms = plain login
director_mail_servers = 172.17.1.1 172.17.1.2
director_servers = 172.17.1.3 172.17.1.32
director_user_expire = 5 mins
lmtp_proxy = yes
log_path = /var/log/dovecot.log
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope
encoded-character vacation subaddress comparator-i;ascii-numeric
relational regex imap4flags copy include variables body enotify
environment mailbox date index ihave duplicate
protocols = imap pop3 lmtp sieve
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    user = dovecot
  }
}
service director {
  fifo_listener login/proxy-notify {
    mode = 0666
  }
  inet_listener {
    address = 172.17.1.3
    port = 9090
  }
  unix_listener director-userdb {
    mode = 0600
  }
  unix_listener login/director {
    mode = 0666
  }
}
service imap-login {
  executable = imap-login director
  process_min_avail = 1
  service_count = 0
}
service lmtp {
  inet_listener lmtp {
    address = 172.17.1.3
    port = 24
    ssl = yes
  }
  process_min_avail = 20
}
service managesieve-login {
  executable = managesieve-login director
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  executable = pop3-login director
}
ssl_cert = </etc/ssl/certs/certum_wildcard.pem
ssl_cipher_list
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_dh_parameters_length = 2048
ssl_key = </etc/ssl/private/certum_wildcard.key
ssl_prefer_server_ciphers = yes
ssl_protocols = !SSLv3 !SSLv2
verbose_proctitle = yes
protocol !smtp {
  passdb {
    args = proxy=y nopassword=y starttls=any-cert
    driver = static
    name   }
}
protocol smtp {
  passdb {
    args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
    driver = sql
    name   }
  userdb {
    args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
    driver = sql
    name   }
}
protocol lmtp {
  auth_socket_path = director-userdb
}


ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 257548
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 257548
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Aki Tuomi

2017-Aug-23 11:11 UTC

head link

socketpair failed: Too many open files on Debian 9

You probably need to increase ulimit -n

Aki


On 23.08.2017 14:10, Patrick Westenberg wrote:> Hi @all,
>
> after re-installing one of my two frontends/proxy-servers I get the
> following error messages after some time (sometimes after 1h, sometimes
> after 24h):
>
>
> 11:23:55 imap-login: Error: socketpair() failed: Too many open files
> 11:23:55 imap-login: Error: socketpair() failed: Too many open files
> 11:23:56 imap-login: Error: socketpair() failed: Too many open files
> 11:23:56 imap-login: Error: socketpair() failed: Too many open files
> 11:23:57 imap-login: Error: socketpair() failed: Too many open files
>
> 11:26:17 imap-login: Error: socket() failed: Too many open files
> 11:26:17 imap-login: Error: proxy(post at example.com): connect(172.17.1.1,
> 143) failed: Too many open files (after 0 secs):
> user=<post at example.com>, method=PLAIN, rip=x.x.x.x, lip=x.x.x.x,
TLS,
> session=<FgPWTWhXa8dQjLoi>
> 11:26:17 imap-login: Error: socketpair() failed: Too many open files
> 11:26:17 imap-login: Error: proxy: SSL handshake failed to
> 172.17.1.1:143: user=<post at example.com>, method=PLAIN,
rip=x.x.x.x,
> lip=x.x.x.x, TLS, session=<HALWTWhXasdQjLoi>
> 11:26:17 imap-login: Error: socket() failed: Too many open files
> 11:26:17 imap-login: Error: proxy(post at example.com): connect(172.17.1.1,
> 143) failed: Too many open files (after 0 secs):
> user=<post at example.com>, method=LOGIN, rip=x.x.x.x, lip=x.x.x.x,
TLS,
> session=<HALWTWhXasdQjLoi>
> 11:26:17 imap-login: Error: socketpair() failed: Too many open files
> 11:26:17 imap-login: Error: proxy: SSL handshake failed to
> 172.17.1.1:143: user=<post at example.com>, method=LOGIN,
rip=x.x.x.x,
> lip=x.x.x.x, TLS, session=<FgPWTWhXa8dQjLoi>
> 11:26:17 imap-login: Error: socket() failed: Too many open files
>
>
> As I switched from KVM to LXC my first idea was that this could be
> caused by LXC but this even happens with KVM.
> I tried dovecot 2.2.31 and 2.2.32.rc2. OS is Debian 9.
>
> These problems don't occur on my old machine (Debian 7).
>
> Any ideas?
>
> Regards
> Patrick
>
>
>
>
> # 2.2.32.rc2 (a350120ca): /usr/local/etc/dovecot/dovecot.conf
> # Pigeonhole version 0.4.19 (e5c7051)
> # OS: Linux 4.4.67-1-pve x86_64 Debian 9.1
> auth_mechanisms = plain login
> director_mail_servers = 172.17.1.1 172.17.1.2
> director_servers = 172.17.1.32 172.17.1.3
> director_user_expire = 5 mins
> lmtp_proxy = yes
> log_path = /var/log/dovecot.log
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope
> encoded-character vacation subaddress comparator-i;ascii-numeric
> relational regex imap4flags copy include variables body enotify
> environment mailbox date index ihave duplicate mime foreverypart
extracttext
> protocols = imap pop3 lmtp sieve
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     group = postfix
>     mode = 0666
>     user = postfix
>   }
>   unix_listener auth-userdb {
>     user = dovecot
>   }
> }
> service director {
>   fifo_listener login/proxy-notify {
>     mode = 0666
>   }
>   inet_listener {
>     address = 172.17.1.32
>     port = 9090
>   }
>   unix_listener director-userdb {
>     mode = 0600
>   }
>   unix_listener login/director {
>     mode = 0666
>   }
> }
> service imap-login {
>   executable = imap-login director
>   process_min_avail = 1
>   service_count = 0
> }
> service lmtp {
>   inet_listener lmtp {
>     address = 172.17.1.32
>     port = 24
>     ssl = yes
>   }
>   process_min_avail = 20
> }
> service managesieve-login {
>   executable = managesieve-login director
>   inet_listener sieve {
>     port = 4190
>   }
> }
> service pop3-login {
>   executable = pop3-login director
> }
> ssl_cert = </etc/ssl/certs/certum_wildcard.pem
> ssl_cipher_list >
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
> ssl_dh_parameters_length = 2048
> ssl_key =  # hidden, use -P to show it
> ssl_prefer_server_ciphers = yes
> verbose_proctitle = yes
> protocol !smtp {
>   passdb {
>     args = proxy=y nopassword=y starttls=any-cert
>     driver = static
>     name >   }
> }
> protocol smtp {
>   passdb {
>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>     driver = sql
>     name >   }
>   userdb {
>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>     driver = sql
>     name >   }
> }
> protocol lmtp {
>   auth_socket_path = director-userdb
> }
>
> ulimit -a
> core file size          (blocks, -c) 0
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 7978
> max locked memory       (kbytes, -l) 64
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 8192
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 7978
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited
>
>
> ###########################
>
>
> This machine has no problems:
>
> # 2.2.18: /usr/local/etc/dovecot/dovecot.conf
> # Pigeonhole version 0.4.8 (0c4ae064f307+)
> # OS: Linux 3.16.0-0.bpo.4-amd64 x86_64 Debian 7.11
> auth_mechanisms = plain login
> director_mail_servers = 172.17.1.1 172.17.1.2
> director_servers = 172.17.1.3 172.17.1.32
> director_user_expire = 5 mins
> lmtp_proxy = yes
> log_path = /var/log/dovecot.log
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope
> encoded-character vacation subaddress comparator-i;ascii-numeric
> relational regex imap4flags copy include variables body enotify
> environment mailbox date index ihave duplicate
> protocols = imap pop3 lmtp sieve
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     group = postfix
>     mode = 0666
>     user = postfix
>   }
>   unix_listener auth-userdb {
>     user = dovecot
>   }
> }
> service director {
>   fifo_listener login/proxy-notify {
>     mode = 0666
>   }
>   inet_listener {
>     address = 172.17.1.3
>     port = 9090
>   }
>   unix_listener director-userdb {
>     mode = 0600
>   }
>   unix_listener login/director {
>     mode = 0666
>   }
> }
> service imap-login {
>   executable = imap-login director
>   process_min_avail = 1
>   service_count = 0
> }
> service lmtp {
>   inet_listener lmtp {
>     address = 172.17.1.3
>     port = 24
>     ssl = yes
>   }
>   process_min_avail = 20
> }
> service managesieve-login {
>   executable = managesieve-login director
>   inet_listener sieve {
>     port = 4190
>   }
> }
> service pop3-login {
>   executable = pop3-login director
> }
> ssl_cert = </etc/ssl/certs/certum_wildcard.pem
> ssl_cipher_list >
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
> ssl_dh_parameters_length = 2048
> ssl_key = </etc/ssl/private/certum_wildcard.key
> ssl_prefer_server_ciphers = yes
> ssl_protocols = !SSLv3 !SSLv2
> verbose_proctitle = yes
> protocol !smtp {
>   passdb {
>     args = proxy=y nopassword=y starttls=any-cert
>     driver = static
>     name >   }
> }
> protocol smtp {
>   passdb {
>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>     driver = sql
>     name >   }
>   userdb {
>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>     driver = sql
>     name >   }
> }
> protocol lmtp {
>   auth_socket_path = director-userdb
> }
>
>
> ulimit -a
> core file size          (blocks, -c) 0
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 257548
> max locked memory       (kbytes, -l) 64
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 8192
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 257548
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited

Patrick Westenberg

2017-Aug-23 12:21 UTC

head link

socketpair failed: Too many open files on Debian 9

I haven't done this on the old, working machine.

So there must be a difference between Debian 7 and 9 how open files are
handled?

Regards
Patrick



Aki Tuomi schrieb:> You probably need to increase ulimit -n
> 
> Aki
> 
> 
> On 23.08.2017 14:10, Patrick Westenberg wrote:
>> Hi @all,
>>
>> after re-installing one of my two frontends/proxy-servers I get the
>> following error messages after some time (sometimes after 1h, sometimes
>> after 24h):
>>
>>
>> 11:23:55 imap-login: Error: socketpair() failed: Too many open files
>> 11:23:55 imap-login: Error: socketpair() failed: Too many open files
>> 11:23:56 imap-login: Error: socketpair() failed: Too many open files
>> 11:23:56 imap-login: Error: socketpair() failed: Too many open files
>> 11:23:57 imap-login: Error: socketpair() failed: Too many open files
>>
>> 11:26:17 imap-login: Error: socket() failed: Too many open files
>> 11:26:17 imap-login: Error: proxy(post at example.com):
connect(172.17.1.1,
>> 143) failed: Too many open files (after 0 secs):
>> user=<post at example.com>, method=PLAIN, rip=x.x.x.x,
lip=x.x.x.x, TLS,
>> session=<FgPWTWhXa8dQjLoi>
>> 11:26:17 imap-login: Error: socketpair() failed: Too many open files
>> 11:26:17 imap-login: Error: proxy: SSL handshake failed to
>> 172.17.1.1:143: user=<post at example.com>, method=PLAIN,
rip=x.x.x.x,
>> lip=x.x.x.x, TLS, session=<HALWTWhXasdQjLoi>
>> 11:26:17 imap-login: Error: socket() failed: Too many open files
>> 11:26:17 imap-login: Error: proxy(post at example.com):
connect(172.17.1.1,
>> 143) failed: Too many open files (after 0 secs):
>> user=<post at example.com>, method=LOGIN, rip=x.x.x.x,
lip=x.x.x.x, TLS,
>> session=<HALWTWhXasdQjLoi>
>> 11:26:17 imap-login: Error: socketpair() failed: Too many open files
>> 11:26:17 imap-login: Error: proxy: SSL handshake failed to
>> 172.17.1.1:143: user=<post at example.com>, method=LOGIN,
rip=x.x.x.x,
>> lip=x.x.x.x, TLS, session=<FgPWTWhXa8dQjLoi>
>> 11:26:17 imap-login: Error: socket() failed: Too many open files
>>
>>
>> As I switched from KVM to LXC my first idea was that this could be
>> caused by LXC but this even happens with KVM.
>> I tried dovecot 2.2.31 and 2.2.32.rc2. OS is Debian 9.
>>
>> These problems don't occur on my old machine (Debian 7).
>>
>> Any ideas?
>>
>> Regards
>> Patrick
>>
>>
>>
>>
>> # 2.2.32.rc2 (a350120ca): /usr/local/etc/dovecot/dovecot.conf
>> # Pigeonhole version 0.4.19 (e5c7051)
>> # OS: Linux 4.4.67-1-pve x86_64 Debian 9.1
>> auth_mechanisms = plain login
>> director_mail_servers = 172.17.1.1 172.17.1.2
>> director_servers = 172.17.1.32 172.17.1.3
>> director_user_expire = 5 mins
>> lmtp_proxy = yes
>> log_path = /var/log/dovecot.log
>> managesieve_notify_capability = mailto
>> managesieve_sieve_capability = fileinto reject envelope
>> encoded-character vacation subaddress comparator-i;ascii-numeric
>> relational regex imap4flags copy include variables body enotify
>> environment mailbox date index ihave duplicate mime foreverypart
extracttext
>> protocols = imap pop3 lmtp sieve
>> service auth {
>>   unix_listener /var/spool/postfix/private/auth {
>>     group = postfix
>>     mode = 0666
>>     user = postfix
>>   }
>>   unix_listener auth-userdb {
>>     user = dovecot
>>   }
>> }
>> service director {
>>   fifo_listener login/proxy-notify {
>>     mode = 0666
>>   }
>>   inet_listener {
>>     address = 172.17.1.32
>>     port = 9090
>>   }
>>   unix_listener director-userdb {
>>     mode = 0600
>>   }
>>   unix_listener login/director {
>>     mode = 0666
>>   }
>> }
>> service imap-login {
>>   executable = imap-login director
>>   process_min_avail = 1
>>   service_count = 0
>> }
>> service lmtp {
>>   inet_listener lmtp {
>>     address = 172.17.1.32
>>     port = 24
>>     ssl = yes
>>   }
>>   process_min_avail = 20
>> }
>> service managesieve-login {
>>   executable = managesieve-login director
>>   inet_listener sieve {
>>     port = 4190
>>   }
>> }
>> service pop3-login {
>>   executable = pop3-login director
>> }
>> ssl_cert = </etc/ssl/certs/certum_wildcard.pem
>> ssl_cipher_list >>
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
>> ssl_dh_parameters_length = 2048
>> ssl_key =  # hidden, use -P to show it
>> ssl_prefer_server_ciphers = yes
>> verbose_proctitle = yes
>> protocol !smtp {
>>   passdb {
>>     args = proxy=y nopassword=y starttls=any-cert
>>     driver = static
>>     name >>   }
>> }
>> protocol smtp {
>>   passdb {
>>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>>     driver = sql
>>     name >>   }
>>   userdb {
>>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>>     driver = sql
>>     name >>   }
>> }
>> protocol lmtp {
>>   auth_socket_path = director-userdb
>> }
>>
>> ulimit -a
>> core file size          (blocks, -c) 0
>> data seg size           (kbytes, -d) unlimited
>> scheduling priority             (-e) 0
>> file size               (blocks, -f) unlimited
>> pending signals                 (-i) 7978
>> max locked memory       (kbytes, -l) 64
>> max memory size         (kbytes, -m) unlimited
>> open files                      (-n) 1024
>> pipe size            (512 bytes, -p) 8
>> POSIX message queues     (bytes, -q) 819200
>> real-time priority              (-r) 0
>> stack size              (kbytes, -s) 8192
>> cpu time               (seconds, -t) unlimited
>> max user processes              (-u) 7978
>> virtual memory          (kbytes, -v) unlimited
>> file locks                      (-x) unlimited
>>
>>
>> ###########################
>>
>>
>> This machine has no problems:
>>
>> # 2.2.18: /usr/local/etc/dovecot/dovecot.conf
>> # Pigeonhole version 0.4.8 (0c4ae064f307+)
>> # OS: Linux 3.16.0-0.bpo.4-amd64 x86_64 Debian 7.11
>> auth_mechanisms = plain login
>> director_mail_servers = 172.17.1.1 172.17.1.2
>> director_servers = 172.17.1.3 172.17.1.32
>> director_user_expire = 5 mins
>> lmtp_proxy = yes
>> log_path = /var/log/dovecot.log
>> managesieve_notify_capability = mailto
>> managesieve_sieve_capability = fileinto reject envelope
>> encoded-character vacation subaddress comparator-i;ascii-numeric
>> relational regex imap4flags copy include variables body enotify
>> environment mailbox date index ihave duplicate
>> protocols = imap pop3 lmtp sieve
>> service auth {
>>   unix_listener /var/spool/postfix/private/auth {
>>     group = postfix
>>     mode = 0666
>>     user = postfix
>>   }
>>   unix_listener auth-userdb {
>>     user = dovecot
>>   }
>> }
>> service director {
>>   fifo_listener login/proxy-notify {
>>     mode = 0666
>>   }
>>   inet_listener {
>>     address = 172.17.1.3
>>     port = 9090
>>   }
>>   unix_listener director-userdb {
>>     mode = 0600
>>   }
>>   unix_listener login/director {
>>     mode = 0666
>>   }
>> }
>> service imap-login {
>>   executable = imap-login director
>>   process_min_avail = 1
>>   service_count = 0
>> }
>> service lmtp {
>>   inet_listener lmtp {
>>     address = 172.17.1.3
>>     port = 24
>>     ssl = yes
>>   }
>>   process_min_avail = 20
>> }
>> service managesieve-login {
>>   executable = managesieve-login director
>>   inet_listener sieve {
>>     port = 4190
>>   }
>> }
>> service pop3-login {
>>   executable = pop3-login director
>> }
>> ssl_cert = </etc/ssl/certs/certum_wildcard.pem
>> ssl_cipher_list >>
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
>> ssl_dh_parameters_length = 2048
>> ssl_key = </etc/ssl/private/certum_wildcard.key
>> ssl_prefer_server_ciphers = yes
>> ssl_protocols = !SSLv3 !SSLv2
>> verbose_proctitle = yes
>> protocol !smtp {
>>   passdb {
>>     args = proxy=y nopassword=y starttls=any-cert
>>     driver = static
>>     name >>   }
>> }
>> protocol smtp {
>>   passdb {
>>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>>     driver = sql
>>     name >>   }
>>   userdb {
>>     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
>>     driver = sql
>>     name >>   }
>> }
>> protocol lmtp {
>>   auth_socket_path = director-userdb
>> }
>>
>>
>> ulimit -a
>> core file size          (blocks, -c) 0
>> data seg size           (kbytes, -d) unlimited
>> scheduling priority             (-e) 0
>> file size               (blocks, -f) unlimited
>> pending signals                 (-i) 257548
>> max locked memory       (kbytes, -l) 64
>> max memory size         (kbytes, -m) unlimited
>> open files                      (-n) 1024
>> pipe size            (512 bytes, -p) 8
>> POSIX message queues     (bytes, -q) 819200
>> real-time priority              (-r) 0
>> stack size              (kbytes, -s) 8192
>> cpu time               (seconds, -t) unlimited
>> max user processes              (-u) 257548
>> virtual memory          (kbytes, -v) unlimited
>> file locks                      (-x) unlimited

Sven Hartge

2017-Aug-23 13:25 UTC

head link

socketpair failed: Too many open files on Debian 9

Patrick Westenberg <pw at wk-serv.de> wrote:
> 11:23:55 imap-login: Error: socketpair() failed: Too many open files
As root run "systemctl edit dovecot.service". This will create a
drop-in
configuration file in /etc/systemd/system/dovecot.service.d/ which will
be appended to the one in /lib/systemd/system/ during startup.

The content should be 

----paste-below----------8<---------------
[Service]
LimitNOFILE=8192
----paste-above----------8<---------------

Then a swift "systemctl daemon-reload" followed by "systemctl
restart dovecot.service"
should fix your problem.

Attention: Do *NOT* follow anyone advising you to copy the whole
systemd.unit from /lib/systemd/system/dovecot.service to
/etc/systemd/system, as this will/may break your system after an update
to a new Debian version in the future.

Gr??e,
Sven.

-- 
Sigmentation fault. Core dumped.

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