Technical Tip: Change memory space for logging

Description

This article provides commands to increase or decrease the logging space size in memory.

Scope

FortiGate.

Solution

When FortiGate is enabled with memory logging, default specific amount of memory space will be allocated for memory logging.

It is possible to change this default memory space for logging.

config log memory global-setting
    set max-size 21097717   <----- Default value in Bytes.
end

To change the value, use the below commands.

config log memory global-setting
    set max-size ?                            <----- Type '?' to know the minimum and maximum value it is possible to set for logging.

aegon-kvm20 # con log  memory  global-setting
aegon-kvm20 (global-setting) # set max-size ?
min:10485760    max:105488588                 <----- Values are in Bytes.

aegon-kvm20 (global-setting) # set max-size 10485760
aegon-kvm20 (global-setting) # end

The log reaches 95 % in the configured limit it shows a warning message and when it reaches 100 % it will override the existing logs.

Note: Memory logging is not suggested in Lower end firewall, for troubleshooting any specific issue or for monitoring the traffic logs locally, it is possible to enable the memory logging and disable it later.