Hi,
I am new to dovecot and I am trying to prepare a POC environment.
I have dovecot installed with postfix to perform SASL authentication.
I'm using postgresql as auth backend which is working fine. But I am
facing an issue with dovecot's internal auth cache. The internal auth
cache just expires in 5 minutes. There is only one login (it's me
testing) and there are no other logins.
OS version: Almalinux 10
Postfix: postfix-3.8.5-8.el10.x86_64
system memory: 4 GB
CPU: 2
auth_cache_size = 10M
auth_cache_ttl = 1800secs
auth_cache_negative_ttl = 300secs ( I have tried this setting to 0 but
it does not change anything )
Here's the dovecot -n:
# 2.3.21 (47349e2482): /etc/dovecot/dovecot.conf
# OS: Linux 6.12.0-55.9.1.el10_0.x86_64 x86_64 AlmaLinux release 10.0
(Purple Lion)
# Hostname: localhostvm
auth_cache_size = 10 M
auth_cache_verify_password_with_worker = yes
auth_debug = yes
auth_mechanisms = plain login
auth_verbose = yes
login_log_format = %$: %s %f
passdb {
args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
driver = sql
}
protocols =
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
}
ssl = required
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_cipher_list = PROFILE=SYSTEM
ssl_key = # hidden, use -P to show it
userdb {
driver = prefetch
}
Here's the cache hit log:
Jul 14 11:53:35 localhostvm postfix/submission/smtpd[107852]: connect
from remote-server
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client in:
AUTH#0112#011LOGIN#011service=smtp#011nologin#011lip=192.168.100.12#011rip=192.168.100.25
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client
passdb out: CONT#0112#011VXNlcm5hbWU6
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client in:
CONT<hidden>
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client
passdb out: CONT#0112#011UGFzc3dvcmQ6
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client in:
CONT<hidden>
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug:
sql(user@tld,192.168.100.25): Performing passdb lookup
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug:
sql(user@tld,192.168.100.25): cache hit: <hidden>#011user=user@tld
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug:
sql(user@tld,192.168.100.25): cache: validating password on worker
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: Loading modules from directory: /usr/lib64/dovecot/auth
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: Module loaded:
/usr/lib64/dovecot/auth/lib20_auth_var_expand_crypt.so
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: Module loaded: /usr/lib64/dovecot/auth/libdriver_pgsql.so
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: Module loaded: /usr/lib64/dovecot/auth/libdriver_sqlite.so
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: sqlpool(pgsql): Creating new connection
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: sqlpool(pgsql): Creating new connection
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: conn unix:auth-worker (pid=107856,uid=97): Server accepted
connection (fd=15)
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: conn unix:auth-worker (pid=107856,uid=97): Sending version
handshake
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: conn unix:auth-worker (pid=107856,uid=97): auth-worker<1>:
Handling PASSW request
Jul 14 11:53:36 localhostvm dovecot[107739]: auth-worker(107886):
Debug: conn unix:auth-worker (pid=107856,uid=97): auth-worker<1>:
Finished
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug:
sql(user@tld,192.168.100.25): Finished passdb lookup
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug:
auth(user@tld,192.168.100.25): Auth request finished
Jul 14 11:53:36 localhostvm dovecot[107739]: auth: Debug: client
passdb out: OK#0112#011user=user@tld
Jul 14 11:53:37 localhostvm postfix/submission/smtpd[107852]:
81GFE2083CH9: client=remote-server[192.168.100.25], sasl_method=LOGIN,
sasl_username=user@tld
I am not sure what is causing the cache to disappear in 5 min although
I have set it to 1800s.
Thank you.
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