Some servers are delay synced...
by Bad Guy
Dear sir,
We have got a N-way master (N=4) openldap running in version 2.4.11 under linux environment.
The 4 servers can be synced immediately. However, after running for several hours, 2 of the servers are synced immediately while the other 2 servers are synced after around 60 mins.
Scenairo :
- Server 1, 2, 3, 4 are synced.
After running for several hours, the following symptoms occur :
- update record in server 3, server 4 will be updated immediately, but server 1 and server 2 got the update 1 hour later.
- update record in server 4, server 3
will be updated immediately, but server 1 and server 2 got the update 1
hour later.
- update record in server 1, server 2
will be updated immediately, but server 3 and server 4 got the update 1
hour later.
- update record in server 2, server 1
will be updated immediately, but server 3 and server 4 got the update 1
hour later.
Server 1 and server 2 are in same LAN segment, server 3 and server 4 in another LAN segment.
There are firewalls between server 1/2 and server 3/4, but for same LAN segment, no firewall in between, only firewall in between different LAN segment.
Any idea for this 1 hour delay synced ?
Every server are config with syncrepl as shown below :
bindmethod=simple
binddn="cn=Manager"
credentials=secret
searchbase="o=ABCDE"
schemachecking=off
type=refreshAndPersist
attrs="*,+"
retry="1 +"
# Performance tuning directives
sizelimit 5000
threads 50
idletimeout 0
cachesize 10000
checkpoint 256 15
Also, from the LDAP log, it shows a lot of "cmp -1, too old" message.
Also, from the log, some error message like the following is found :
server01 slapd[6386]: do_syncrep2: rid=004 (-1) Can't contact LDAP server
server01 slapd[6386]: do_syncrepl: rid=004 retrying
server01 slapd[6386]: syncrepl_entry: rid=004 LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_ADD)
server01 slapd[6386]: syncrepl_entry: rid=004 be_search (0)
server01 slapd[6386]: syncrepl_entry: rid=004 cn=test1,ou=test,o=ABCD
server01 slapd[6386]: syncrepl_entry: rid=004 be_modify (0)
Any idea on this ?
Thanks a lot....
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14 years, 10 months
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