May 26, 2018
Reverse-resolve IP in Apache log files
reslog resolves IPs in Apache8 log files. The result can then be analyzed by another program, like Analog. You can think of it as a replacement of the Apache8 HostNameLookups directive, in the sense that it resolves client IPs altogether once a day.
Resolving takes long time. This is mainly caused by resolving Network packets may be filtered by firewalls; DNS servers may not be correctly configured; may not be up working; may sit in slow network sections; may be old slow machines; may have traffic jam… etc. All these reasons are out of our control.