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50 lines
1.2 KiB
Perl
Executable File
50 lines
1.2 KiB
Perl
Executable File
#!/usr/bin/env perl
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# File: vm-watchdog
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#
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# Purpose: Monitors pbot-vm cpu usage. Resets vm to snapshot if cpu exceeds
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# threshold limits.
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# SPDX-FileCopyrightText: 2021 Pragmatic Software <pragma78@gmail.com>
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# SPDX-License-Identifier: MIT
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use warnings;
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use strict;
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use Proc::ProcessTable;
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use IO::Socket;
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my $SLEEP = 15;
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my $MAX_PCTCPU = 25;
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my $QEMU = 'qemu-system-x86';
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my $DOMAIN = 'pbot-vm';
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my $last_pctcpu = 0;
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sub reset_vm {
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print "Resetting vm\n";
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system("virsh snapshot-revert $DOMAIN 1");
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print "Reset vm\n";
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}
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while (1) {
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my $t = Proc::ProcessTable->new(enable_ttys => 0);
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foreach my $p (@{$t->table}) {
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if ($p->fname eq $QEMU and $p->cmndline =~ m/guest=\Q$DOMAIN\E/) {
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# $p->pctcpu never updates? so we use top instead.
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my $pctcpu = `top -b -n 1 -p $p->{pid} | tail -n 1 | awk '{print \$9}'`;
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$pctcpu =~ s/^\s+|\s+$//g;
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print scalar localtime, " :: Got $DOMAIN qemu pid: $p; using $pctcpu cpu\n" if $pctcpu > 0;
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if ($pctcpu >= $last_pctcpu and $last_pctcpu >= $MAX_PCTCPU) {
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reset_vm;
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$last_pctcpu = 0;
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} else {
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$last_pctcpu = $pctcpu;
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}
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}
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}
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sleep $SLEEP;
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}
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