Hello,

We are running OpenLDAP 2.4.23. Part of our implementation proxies to an Active Directory server. Whenever connectivity to the AD server is interrupted, queries to the non-proxied portion of our implementation take a very long time and cause many issues with querying services.

I have been looking at timeout options for both slapd.conf and ldap.conf and I have found the following:

ldap.conf:

NETWORK_TIMEOUT <integer>

Specifies the timeout (in seconds) after which the poll(2)/select(2) following a connect(2) returns in case of no activity.

TIMEOUT <integer>

Specifies a timeout (in seconds) after which calls to synchronous LDAP APIs will abort if no response is received. Also used for

any ldap_result(3) calls where a NULL timeout parameter is supplied.

slapd.conf:

idletimeout <integer>

Specify the number of seconds to wait before forcibly closing an idle client connection. A idletimeout of 0 disables this feature. The

default is 0. You may also want to set the writetimeout option.

writetimeout <integer>

Specify the number of seconds to wait before forcibly closing a connection with an outstanding write. This allows recovery from various

network hang conditions. A writetimeout of 0 disables this feature. The default is 0.

I am wondering which timeout values would be best to set in order to speed up queries when proxy connectivity is interrupted. Perhaps there is something else wrong with our config that is causing this issue.

Our ldap.conf file is basically empty (so, using all default)

Our slapd.conf looks something like this (heavily edited to remove specific info):

##########BEGIN SLAPD.CONF##########

include /etc/openldap/schema/core.schema

include /etc/openldap/schema/cosine.schema

include /etc/openldap/schema/nis.schema

include /etc/openldap/schema/inetorgperson.schema

include /etc/openldap/schema/samba3.schema

include /etc/openldap/schema/lockfile.schema

include /etc/openldap/schema/yast.schema

include /etc/openldap/schema/ldap2dns.schema

include /etc/openldap/schema/radius.schema

include /etc/openldap/schema/mail.schema

loglevel 256

allow bind_v2

sasl-host [REMOVED]

sasl-realm [REMOVED]

pidfile /var/run/openldap/slapd.pid

argsfile /var/run/openldap/slapd.args

modulepath /usr/lib64/openldap

moduleload rwm

tool-threads 2

#TLSCipherSuite HIGH:MEDIUM:+SSLv2

#TLSCACertificatePath /etc/ssl/certs/

#TLSCertificateFile [REMOVED]

#TLSCertificateKeyFile [REMOVED]

#TLSVerifyClient demand

access to attrs=[REMOVED]

by anonymous [REMOVED]

by * [REMOVED]

access to attrs=[REMOVED]

by * [REMOVED]

access to [REMOVED]

by * [REMOVED]

access to [REMOVED]

by * [REMOVED]

database [REMOVED]

suffix "[REMOVED]"

checkpoint 20480 5

cachesize 100000

directory [REMOVED]

dbconfig set_cachesize 0 268435456 1

dbconfig set_lg_max 268435456

dbconfig set_lg_bsize 16777216

dbconfig set_lk_max_objects 5000

dbconfig set_lk_max_locks 5000

dbconfig set_lk_max_lockers 50000

dbconfig set_flags DB_LOG_AUTOREMOVE

index [REMOVED]

rootdn [REMOVED]

rootpw [REMOVED]

syncrepl rid=[REMOVED]

provider=[REMOVED]

type=refreshAndPersist

retry="300 +"

searchbase="[REMOVED]"

filter="(objectClass=*)"

sizelimit="unlimited"

timelimit="unlimited"

scope=sub

schemachecking=off

bindmethod=simple

binddn="[REMOVED]"

credentials=[REMOVED]

database [REMOVED]

suffix "[REMOVED]"

checkpoint 20480 5

cachesize 100000

directory [REMOVED]

dbconfig set_cachesize 0 268435456 1

dbconfig set_lg_max 268435456

dbconfig set_lg_bsize 16777216

dbconfig set_lk_max_objects 5000

dbconfig set_lk_max_locks 5000

dbconfig set_lk_max_lockers 50000

dbconfig set_flags DB_LOG_AUTOREMOVE

index [REMOVED]

rootdn "[REMOVED]"

rootpw [REMOVED]

syncrepl [REMOVED]

provider=[REMOVED]

type=refreshAndPersist

retry="300 +"

searchbase="[REMOVED]"

filter="(objectClass=*)"

sizelimit="unlimited"

timelimit="unlimited"

scope=sub

schemachecking=off

bindmethod=simple

binddn="[REMOVED]"

credentials=[REMOVED]

database ldap

suffix "[REMOVED]"

uri "ldap:// [REMOVED]"

rebind-as-user

lastmod off

chase-referrals yes

acl-bind

bindmethod=simple

binddn="[REMOVED]"

credentials="[REMOVED]"

idassert-bind

bindmethod=simple

binddn="[REMOVED]"

credentials="[REMOVED]"

mode=none

flags=prescriptive

idassert-authzFrom "dn.regex:.*"

overlay rwm

rwm-map attribute [REMOVED]

rwm-map objectclass [REMOVED]

database [REMOVED]

##########END SLAPD.CONF##########

Thank You