In one of our slave DNS servers BIND, version bind910-9.10.0P2_3, constantly get killed with the following message in
Jul 30 01:00:10 cinnabar kernel: pid 602 (named), uid 53, was killed: out of swap space
This service runs on a FreeBSD 10.0 VM in XenServer 6.2, it has 512MB of system memory.
At this moment
pstat -m -s return this:
Device 1M-blocks Used Avail Capacity /dev/ada0p3 512 9 502 2%
I don't think it's a swap problem, it appears to be memory leakage, but I'm unsure.
EDIT: Access information.
This is one of two slave DNS servers, they only store the zones from the authoritative server and act as a recursive server for the internal users to the outside world. The number of clients is something between 700-1500 simultaneous users. Since we have a /21 internal space and a /23 public IPv4 space and there's no queries from the outside world, the port 53 is even blocked on the firewall to those machines.