Hello all,
I have a Solaris 10 system that queries a clients openldap server to
deliver a certain service and the client is complaining that my system
sometimes denies services to clients. Well my system only denies
service to clients if the openldap system from the customer fails to
answer.
In this sense I tried to write a script to monitor the openldap server
and its responsiveness but ldapsearch client in Solaris 10 doesn't
work as I expected :(
For example, all ok:
bash# ldapsearch -v -b '' -s base -h 192.168.1.102:7323
<http://192.168.1.102:7323> 'objectclass=top' namingContexts
ldapsearch: started Fri Jun 13 01:51:53 2008
ldap_init( 192.168.1.102:7323 <http://192.168.1.102:7323>, 389 )
filter pattern: objectclass=top
returning: namingContexts
filter is: (objectclass=top)
version: 1
dn:
namingContexts: nodeName=XXXXX
1 matches
Now imagine that the ldap server goes down:
bash# ldapsearch -v -b '' -s base -h 192.168.1.102:7323
<http://192.168.1.102:7323> 'objectclass=top' namingContexts
ldapsearch: started Fri Jun 13 02:11:04 2008
ldap_init( 192.168.1.102:7323 <http://192.168.1.102:7323>, 389 )
filter pattern: objectclass=top
returning: namingContexts
filter is: (objectclass=top)
ldap_search: Can't connect to the LDAP server - Connection refused
Now imagine that the machine hosting LDAP goes down or a problem
somewhere in the network occurs or a firewall blocks traffic (timeout):
bash# ldapsearch -v -b '' -s base -h 192.168.1.102:7323
<http://192.168.1.102:7323> 'objectclass=top' namingContexts
ldapsearch: started Fri Jun 13 02:11:04 2008
ldap_init( 192.168.1.102:7323 <http://192.168.1.102:7323>, 389 )
filter pattern: objectclass=top
returning: namingContexts
filter is: (objectclass=top)
And it just stays here forever. The -l flag only works after the
search is initiated server side. There isn't a switch for a connection
timeout limit. With this behaviour I can't test this as I imagined.
Maybe some of you already have a monitoring script?
Thanks in advance for any tip!
PS: The script I wrote initially:
##############################################################
#!/bin/bash
LDAP_HOST=127.0.0.1:10000 <http://127.0.0.1:10000>
POOLING_INTERVAL=5
LOGFILE=/var/log/ldap_watchdog.log
#
echo "Watchdog started at `date`" >> $LOGFILE
while `/bin/true`; do
ldapsearch -v -b '' -s base -h $LDAP_HOST 'objectclass=top'
namingContexts
if [ $? -ne 0 ]; then
echo "`date`: Could not establish connection to LDAP
server" >> $LOGFILE
fi
sleep $POOLING_INTERVAL
done
##############################################################
Alexandre Vieira - nullpt@gmail.com <mailto:nullpt@gmail.com>