On 2016-09-12 19:23, Rob DeSanno wrote:
The challenge presented to me was to somehow configure notifications
to be sent only when a certain percentage of hosts experience critical
alerts.
For example, instead of sending out a notification when every host
fails a ping check, only send one out if 10%, or more, hosts fail.
We want something a little more complicated than that but the basic
theory should be the same, assuming its possible. Anyone have any
experience or thoughts on how to go about doing this?
I have implemented something like this using check_dummy and Icinga2's
runtime macros.
Behold the following template (the basic idea is borrowed somewhere
else, can't remember where):
template Host "dummy-cluster" {
import "generic-host"
check_command = "dummy"
vars.cluster_nodes = [ ]
vars.dummy_state = {{
var up_count = 0
var down_count = 0
var cluster_nodes = macro("$cluster_nodes$")
for (node in cluster_nodes) {
if (get_host(node).state > 0) {
down_count += 1
} else {
up_count += 1
}
}
if (up_count >= 1 ) {
return 0 //at least one host responded
} else {
return 2 //no host answered
}
}}
vars.dummy_text = {{
var output = "Cluster hosts:\n"
var cluster_nodes = macro("$cluster_nodes$")
for (node in cluster_nodes) {
output += node + ": " + get_host(node).last_check_result.output +
"\n"
}
return output
}}
}
As you can see, the vars.dummy_state is always evaluated at runtime and
takes the last state of all host objects stored in vars.cluster_nodes
into account.
My template always returns UP as long as one host in vars.cluster_nodes
is UP.
You could introduce an additional var where you can define which
percentage at which everything should be considered "UP".
I instantiate the template as follows:
object Host "ClusterA" {
import "dummy-cluster"
vars.cluster_nodes = [ "HostA", "HostB", "HostC", "HostD" ]
}
Kind regards,
Markus
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