|
I am having a problem with what appears (to me) to be ‘stale’
TCP connections for syncrepl between the master and a pair of slaves.
After restarting all, I see changes on the master replicated to both
slaves. BUT, if I wait about 30 minutes or more, then make a change, the
replication fails (most of the time). netstat on the LDAP port show the
connections still established, but queued packets at the master server.
After about 15 minutes, the master server drops the connection. An
overnight tcpdump on the master showed LDAP occasionally sending a keep-alive,
with 2hrs between the keep-alive messages (these keep-alives are inconsistent,
though, some nights I see none). I am running Red Hat EL5 and Openldap 2.3.43 on all servers with
no TLS or SASL (in our integration/test facility). I don’t see anything in the documentation pertaining
to keep-alives, other than ITS#4708 for 2.3.38. Here’s the syncrepl for one slave: syncrepl
rid=004
type=refreshAndPersist
provider=ldap://172.24.1.191
retry="30 10 300 3"
searchbase="o=partner_x,dc=ourcompany-int,dc=net"
filter="(objectClass=*)"
scope=sub
schemachecking=off
bindmethod=simple
binddn="cn=syncRepl,o=partner_x,dc=ourcompany-int,dc=net "
credentials="secret" updateref
ldap://172.24.1.191 The other slave’s slapd.conf is indentical except
rid=002. On the master I have: overlay
syncprov syncprov-checkpoint
100 30 syncprov-sessionlog
100 Note: The 2 slaves are running on blades in an IBM
chassis, and the master is on a 1U Linux server, just ‘one-hop’
away. Prior to this, when I had a master/slave pair running on the
blades, syncRepl was working fine for several months. It was not until I
moved the master to the another server did the failures start. Thanks in advance for any help or info. John Kane This message is confidential to Prodea Systems, Inc unless otherwise indicated or apparent from its nature. This message is directed to the intended recipient only, who may be readily determined by the sender of this message and its contents. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient:(a)any dissemination or copying of this message is strictly prohibited; and(b)immediately notify the sender by return message and destroy any copies of this message in any form(electronic, paper or otherwise) that you have.The delivery of this message and its information is neither intended to be nor constitutes a disclosure or waiver of any trade secrets, intellectual property, attorney work product, or attorney-client communications. The authority of the individual sending this message to legally bind Prodea Systems is neither apparent nor implied,and must be independently verified. |