Am using Heartbeat to ICMP check 2500+ endpoints, and over double the number of TCP ports.
On a RHEL 6 bare metal server, there are no issues. But on an Ubuntu 18 VM, I'm starting to see a large number of these errors:
write ip4 0.0.0.0->x.y.z.w: sendto: no buffer space available
I tried this first:
sysctl -w net.ipv4.neigh.default.gc_thresh1=6144
sysctl -w net.ipv4.neigh.default.gc_thresh2=8192
sysctl -w net.ipv4.neigh.default.gc_thresh3=12288
I then tried this:
heartbeat.scheduler.limit: 1048576 (Note: /proc/sys/fs/file-max = 1219493)
But still the same error!
Please can someone help here?