"James Harper" <james.harper AT bendigoit.com DOT au> kirjoitti viestissä 
news:AEC6C66638C05B468B556EA548C1A77D016DDB79@trantor...
> The default keepalive settings in the Linux kernel are:
> tcp_keepalive_time = 7200 seconds (2 hours)
> tcp_keepalive_intvl = 75 seconds
> tcp_keepalive_probes = 9
>
> So, after 7200 seconds of inactivity on a connection, Linux will send 9
> probes (dummy packets) on the connection, 75 seconds apart.
>
> 7200 + 9 * 75 = 7875 seconds = 2 hours, 11 minutes and 15 seconds. I
> don't think that's a coincidence.
>
> There are 3 TCP connections when a backup runs:
> DIR->SD
> DIR->FD
> FD->SD
>
> The FD->SD one moves a lot of traffic, and one of the DIR->SD or DIR->FD
> ones moves a bit (attributes) but I can't remember which one. The other
> one is probably sitting idle and a firewall somewhere is timing out the
> connection long before the 2 hours that Linux uses as a minimum. When
> that connection drops, the DIR will assume that something has gone wrong
> and kill the job even though traffic is moving around on the other
> connections.
>
> It should be pretty easy to fix, one of the following should do the job:
> . Use bacula's keepalive options (described in the docs I think)


I think the keyword to search from the Bacula docs is "heartbeat interval".
There obviously is more than one setting like this (depending on which
connection needs to be kept alive), so the correct one may be in any
of the conf files.


> . Lower the tcp_keepalive_time (/proc/sys/net/ipv4/tcp_keepalive_time)
> to 90 seconds. This change is global but should only start to cause
> problems if you have hundreds or thousands of mostly-idle TCP
> connections.
> . Change the settings in the firewall
> (okay that last one might be harder and/or undesirable, depending on the
> firewall)
>



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