socketpair failed: Too many open files on Debian 9
Aki Tuomi
aki.tuomi at dovecot.fi
Wed Aug 23 14:11:36 EEST 2017
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
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