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mgmt/examples/lang/hysteresis1.mcl
James Shubin 05d570d250 lang: parser, funcs: Change the logical operators to OR, AND, NOT
This makes it easier to read for some, and easier to parse for us. This
also frees up more characters to use elsewhere.
2023-10-09 17:19:08 -04:00

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import "sys"
file "/tmp/mgmt/systemload" {
state => $const.res.file.state.exists,
content => template("load average: {{ .load }} threshold: {{ .threshold }}\n", $tmplvalues),
}
$tmplvalues = struct{load => $theload, threshold => $threshold,}
$theload = structlookup(sys.load(), "x1")
$threshold = 1.5 # change me if you like
# simple hysteresis implementation
$h1 = $theload > $threshold
$h2 = $theload{1} > $threshold
$h3 = $theload{2} > $threshold
$unload = $h1 or $h2 or $h3
virt "mgmt1" {
uri => "qemu:///session",
cpus => 1,
memory => 524288,
state => "running",
transient => true,
}
# this vm shuts down under load...
virt "mgmt2" {
uri => "qemu:///session",
cpus => 1,
memory => 524288,
state => if $unload { "shutoff" } else { "running" },
transient => true,
}