Snel.com - Notice history

We introduced monitoring nf_conntrack_count and nf_conntrack_max and alerting at tresholds. This will help us (pro-actively) identify and with faster resolution times in the future.

At 20:50 CEST we received our first alert regarding a hypervisor being unreachable. Upon investigation we found that the nf_conntrack table was full.

We're still investigating what the reason for this is since we have a fairly high value for nf_conntrack_max, and nf_conntrack_count is nowhere near the value of nf_conntrack_max.

We have increased (3x) nf_conntrack_max and rebooted the server.

At 21:31 CEST the server was rebooted and all VM's were being started.