When you issue a sudo fcli commit command, you restart FastNetMon. It leads to a complete drop of all information accumulated by FastNetMon, and you may notice a drop on graphs in Grafana when such events happen.
Before using this capability, you need to have subsystems which handle such logic:
sudo fcli set main keep_traffic_counters_during_restart true sudo fcli commit
We offer an option which can be used to avoid traffic drops during restart, and you can enable it this way from fcli:
sudo fcli set save_traffic_counters
After that, FastNetMon will create traffic dumps in the cache folder:
sudo ls -l /var/cache/fastnetmon/ total 35872 -rw-rw-rw- 1 root root 2192900 Sep 9 20:39 speed_counters_local_ipv4_hosts.dat -rw-rw-rw- 1 root root 3456 Sep 9 20:39 speed_counters_local_ipv4_networks.dat -rw-rw-rw- 1 root root 569 Sep 9 20:39 speed_counters_local_ipv6_hosts.dat -rw-rw-rw- 1 root root 569 Sep 9 20:39 speed_counters_local_ipv6_networks.dat -rw-rw-rw- 1 root root 8145 Sep 9 20:39 speed_counters_total_hostgroups.dat -rw-rw-rw- 1 root root 1620 Sep 9 20:39 speed_counters_total_ipv4.dat -rw-rw-rw- 1 root root 1531 Sep 9 20:39 speed_counters_total_ipv6.dat
And then you can apply a commit command, which will not lead to drops on graphs:
sudo fcli commit
You may confirm that it happened successfully using these log entries:
cat /var/log/fastnetmon/fastnetmon.log|grep 'Start loading' 2022-09-09 19:54:26,584 [INFO] Start loading local IPv4 hosts traffic counters from disk 2022-09-09 19:54:26,630 [INFO] Start loading local IPv4 networks traffic counters from disk 2022-09-09 19:54:26,630 [INFO] Start loading local IPv6 hosts traffic counters from disk 2022-09-09 19:54:26,630 [INFO] Start loading local IPv6 networks traffic counters from disk 2022-09-09 19:54:26,630 [INFO] Start loading total hostgroup traffic counters from disk 2022-09-09 19:54:26,631 [INFO] Start loading total IPv4 traffic counters from disk 2022-09-09 19:54:26,631 [INFO] Start loading total IPv6 traffic counters from disk 2022-09-09 20:39:37,933 [INFO] Start loading local IPv4 hosts traffic counters from disk 2022-09-09 20:39:37,983 [INFO] Start loading local IPv4 networks traffic counters from disk 2022-09-09 20:39:37,983 [INFO] Start loading local IPv6 hosts traffic counters from disk 2022-09-09 20:39:37,983 [INFO] Start loading local IPv6 networks traffic counters from disk 2022-09-09 20:39:37,983 [INFO] Start loading total hostgroup traffic counters from disk 2022-09-09 20:39:37,984 [INFO] Start loading total IPv4 traffic counters from disk 2022-09-09 20:39:37,984 [INFO] Start loading total IPv6 traffic counters from disk
In the current version, FastNetMon can save / load traffic for the following types of counters:
- Total traffic
- Per network IPv4, per network /24 IPv4, IPv6
- Per host IPv4, IPv6 traffic
- Total hostgroups traffic
- Per ASN traffic
In case of really large networks time required to save/load all counters may be significant, and you will benefit from an NVME/SSD-based storage system to speed up this process.