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update: reduce the max burst of event drops

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This also introduces a threshold configurable value.

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>
This commit is contained in:
Leonardo Di Donato 2021-03-19 12:42:58 +00:00 committed by poiana
parent 7ea80e39b1
commit b8b50932fe
1 changed files with 18 additions and 8 deletions
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26
falco.yaml
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@ -1,5 +1,5 @@
# #
# Copyright (C) 2019 The Falco Authors. # Copyright (C) 2021 The Falco Authors.
# #
# #
# Licensed under the Apache License, Version 2.0 (the "License"); # Licensed under the Apache License, Version 2.0 (the "License");
@ -68,24 +68,34 @@ priority: debug
buffered_outputs: false buffered_outputs: false
# Falco uses a shared buffer between the kernel and userspace to pass # Falco uses a shared buffer between the kernel and userspace to pass
# system call information. When falco detects that this buffer is # system call information. When Falco detects that this buffer is
# full and system calls have been dropped, it can take one or more of # full and system calls have been dropped, it can take one or more of
# the following actions: # the following actions:
# - "ignore": do nothing. If an empty list is provided, ignore is assumed. # - ignore: do nothing (default when list of actions is empty)
# - "log": log a CRITICAL message noting that the buffer was full. # - log: log a CRITICAL message noting that the buffer was full
# - "alert": emit a falco alert noting that the buffer was full. # - alert: emit a Falco alert noting that the buffer was full
# - "exit": exit falco with a non-zero rc. # - exit: exit Falco with a non-zero rc
#
# Notice it is not possible to ignore and log/alert messages at the same time.
# #
# The rate at which log/alert messages are emitted is governed by a # The rate at which log/alert messages are emitted is governed by a
# token bucket. The rate corresponds to one message every 30 seconds # token bucket. The rate corresponds to one message every 30 seconds
# with a burst of 10 messages. # with a burst of one message.
#
# The messages are emitted when the percentage of dropped system calls
# with respect the number of events in the last second
# is greater than the given threshold (a double in the range [0, 1]).
#
# For debugging/testing it is possible to simulate the drops using
# the `simulate_drops: true`. In this case the threshold does not apply.
syscall_event_drops: syscall_event_drops:
threshold: .1
actions: actions:
- log - log
- alert - alert
rate: .03333 rate: .03333
max_burst: 10 max_burst: 1
# Falco continuously monitors outputs performance. When an output channel does not allow # Falco continuously monitors outputs performance. When an output channel does not allow
# to deliver an alert within a given deadline, an error is reported indicating # to deliver an alert within a given deadline, an error is reported indicating