--On Wednesday, March 01, 2017 8:48 AM +0200 Nick Milas nick@eurobjects.com wrote:
Hello,
I have recently installed two syncrepl consumers using 2.4.44 on CentOS 7 using LTB rpm packages.
I am almost daily facing issues with consumers losing connection to the master. I always have to restart the consumer in order to re-establish connection.
Note 1: These two consumers have replaced two older ones running 2.4.39 LTB (and earlier versions) on CentOS 5 without any such issues.
Note 2: Master is using 2.4.44 version as well (but on CentOS 5).
Is this a known bug or I need to change/add something in the config when using this OpenLDAP version so that the problem gets resolved?
Have you tried setting the "keepalive" parameter in your syncrepl configs?
--Quanah
--
Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: http://www.symas.com
On 2/3/2017 12:17 πμ, Quanah Gibson-Mount wrote:
Have you tried setting the "keepalive" parameter in your syncrepl configs?
Thank you Quanah,
I just added (to syncrepl config):
keepalive=20:100:2
Any suggestions on the selected values? What are the default ones? (I haven't found them in docs.)
I will monitor the situation and I'll let you know of the outcome.
Has such an issue been reported by others in recent versions? Why didn't I have this problem with all versions until 2.4.39 (on CentOS 5)?
Some notes follow:
Interestingly, in the documentation:
http://www.openldap.org/doc/admin24/replication.html http://www.openldap.org/doc/admin24/slapdconfig.html#Configuration%20File%20...
...I don't see any reference to the keepalive parameter.
However, "man slapd.conf" states:
The keepalive parameter sets the values of idle, probes, and interval used to check whether a socket is alive; idle is the number of seconds a connection needs to remain idle before TCP starts sending keepalive probes; probes is the maximum number of keepalive probes TCP should send before dropping the connection; interval is interval in seconds between individual keepalive probes. Only some systems support the customization of these values; the keepalive parameter is ignored otherwise, and system-wide settings are used.
Since "only some systems support the customization of these values; the keepalive parameter is ignored otherwise", how can I make sure that this parameter has been configured successfully and is enabled on my system (CentOS 7)? I enabled "loglevel config stats sync"but I don't see any mention of configured syncrepl parameters during OpenLDAP start.
Please advise.
Thanks, Nick
openldap-technical@openldap.org
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Nick Milas -
Quanah Gibson-Mount