[lvs-users] IPVS error : "no destination available"

Khosrow Ebrahimpour khosrow.ebrahimpour at ec.gc.ca
Fri Sep 14 22:12:28 BST 2012

Hi List,

I run a cluster of ldap servers behind LVS and recently started to see 
connection timeouts from clients that are connected to the loadbalancer. If 
those same clients are connected directly to the realserver, there is no 

The loadbalancer is running LVS-DR with a LC scheduler with two realservers. 
And each time there's a timeout error both realservers are available and 
there's no error logged by the LDAP service.

After looking through various log files, I found that about once a day I get 
this error:

Sep 13 06:27:20 lvs1 kernel: [39885980.112929] IPVS: lc: TCP - 
no destination available

I was unable to find any kernel variables to increase max connections (I looked 
here http://www.kernel.org/doc/Documentation/networking/ipvs-sysctl.txt). 

A thread on the lvs-devel ( http://archive.linuxvirtualserver.org/html/lvs-
 ) list mentions the variable ip_vs_dest_totalconns. Is there a way to 
increase this?

Any help is appreciated.

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