Hi,
after upgrading to Debian 9 (thus Postfix 3.1.8) I'm experiecing an odd
behaviour, which causes slowness on all the infrastructure.
I have a generator server which injects (via smtp) into postfix, the
actual sender, and when burst of delivery happens, the receiving
postfix stuck before answering to the generator, which causes the
generator queues to fill up.
I've logged the smtp session under load from the postfix 3.1.8 server,
and in the following log excerpt you can note a "pause" of ~26 seconds:
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 9 data </td>
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 7 data </tr>
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 36 data </table></
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 279 data <tr><td al
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 503 data You have r
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 18 data </td></tr>
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 67 data <span styl
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 7 data </html>
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 0 data
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 55 data --____=-WW
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type N
len 0 data
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type X
len 0 data
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]: rec_put: type E
len 0 data
Nov 30 09:11:31 postfix01 postfix-main/smtpd[31800]:
vstream_fflush_some: fd 18 flush 2433
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]:
vstream_buf_get_ready: fd 18 got 18
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: public/cleanup
socket: wanted attribute: status
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: input attribute
name: status
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: input attribute
value: 0
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: public/cleanup
socket: wanted attribute: reason
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: input attribute
name: reason
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: input attribute
value: (end)
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: public/cleanup
socket: wanted attribute: (list terminator)
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: input attribute
name: (end)
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: >
gen01.localdomain[192.168.25.135]: 250 2.0.0 Ok: queued as
ECA962EA0B336
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]:
vstream_fflush_some: fd 10 flush 39
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: abort all milters
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: milter8_abort:
abort milter inet:127.0.0.1:12301
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: watchdog_pat:
0x561d4886f850
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]:
vstream_buf_get_ready: fd 10 got 6
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: <
gen01.localdomain[192.168.25.135]: QUIT
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: >
gen01.localdomain[192.168.25.135]: 221 2.0.0 Bye
Nov 30 09:11:58 postfix01 postfix-main/smtpd[31800]: match_hostname:
smtpd_client_event_limit_exceptions: gen01.localdomain ~? 127.0.0.0/8
I can provide the full session log.
postfix01 data/spool are on tmpfs.
Do you have any suggestions? This is unfortunately stopping the upgrade
to postfix 3.x for the whole infrastructure.
Thank for any help you can provide!
Regards,
Christopher
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
bounce_queue_lifetime = 6h
compatibility_level = 2
config_directory = /etc/postfix
connection_cache_ttl_limit = 16s
data_directory = /var/spool/postfix/data
default_destination_concurrency_limit = 200
default_destination_rate_delay = 0s
default_destination_recipient_limit = 50
default_recipient_limit = 40
default_transport = defer
disable_mime_output_conversion = yes
header_checks = regexp:/etc/postfix/header_checks
in_flow_delay = 1
inet_interfaces = 192.168.25.131, 127.0.0.1
inet_protocols = ipv4
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
maximal_backoff_time = 4000s
maximal_queue_lifetime = 3h
milter_default_action = accept
milter_protocol = 6
minimal_backoff_time = 300s
mydestination =
myhostname = postfix01.localdomain
mynetworks = $config_directory/mynetworks
myorigin = /etc/mailname
non_smtpd_milters = $smtpd_milters
qmgr_message_active_limit = 80000
qmgr_message_recipient_limit = 80000
queue_directory = /var/spool/postfix
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_connect_timeout = 3
smtp_connection_cache_on_demand = no
smtp_connection_cache_time_limit = 16s
smtp_connection_reuse_time_limit = 16s
smtp_discard_ehlo_keyword_address_maps = hash:/etc/postfix/busted-
servers
smtp_helo_timeout = 30
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtp_tls_enforce_peername = no
smtp_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtp_tls_loglevel = 0
smtp_tls_mandatory_ciphers = low
smtp_tls_security_level = may
smtp_tls_session_cache_timeout = 0
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_client_connection_count_limit = 8000
smtpd_milters = inet:127.0.0.1:12301
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = no
tls_random_source = dev:/dev/urandom
transport_maps = regexp:/etc/postfix/transport tcp:[127.0.0.1]:23478
--
Christopher R. Gabriel - Senior System Architect
Keyman Technologies Srl - Business Center
Via Conca del Naviglio 18, 20123 Milan - Italy
Phone +39 0287343803
Mobile +39 391 3459671
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