240e5b34d0
1.) Handle installation of the script to determine the amount of free
memory and swap space on the local machine automatically.
2.) Fix the NetBSD implementation of the above script.
3.) Create a wrapper shell script for invoking Cacti's poller.
4.) Simplify the installation instrunctions using the above enhancements.
5.) Don't included the log file in the package list. It doesn't belong
there and "pkg_delete" will correctly complain that it has been
modified.
ToDo:
- The log file and the "rrdtool" database still need to be moved to
a directory under "${VARBASE}".
- "config.php" should really be a config file to allow using a
non-default password for the MySQL database. But the file would have
to be readable by both the user of the webserver and that cacti user.
99 lines
3.1 KiB
Perl
99 lines
3.1 KiB
Perl
#!/usr/bin/perl
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#
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# $NetBSD: netbsd_memory.pl,v 1.2 2014/01/16 21:10:00 tron Exp $
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#
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# Copyright (c) 2014 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Matthias Scheler.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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use warnings;
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use strict;
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use POSIX;
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# Use vmstat(1) to get memory usage information. "vmstat -s" produces
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# output lines like these:
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#
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# 2034763 pages managed
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# 28953 pages free
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#
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# This function creates a hash using the description as a key to the value.
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sub get_vm_stats()
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{
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my %vm_stats;
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my $vmstat_fh;
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if (!open($vmstat_fh, '-|', '/usr/bin/vmstat -s')) {
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die('Cannot start vmstat.');
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}
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while (my $line = <$vmstat_fh>) {
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$line =~ s/^\s+//;
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$line =~ s/\s+$//;
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my @words = split(/\s+/, $line, 2);
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if (scalar(@words) < 2) {
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next;
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}
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my ($value, $descr) = @words;
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$vm_stats{$descr} = $value;
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}
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close($vmstat_fh);
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return %vm_stats;
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}
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if (scalar(@ARGV) < 1) {
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die('Please provide a field name');
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}
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my $page_size = POSIX::sysconf(&POSIX::_SC_PAGESIZE);
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my %vm_stats = get_vm_stats();
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# Calculate metrics using the stats reported by vmstat(1).
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# Cacti only uses "MemFree" and "SwapFree" at the moment.
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my $value = 0;
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if ($ARGV[0] =~ 'MemTotal') {
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$value = $vm_stats{'pages managed'};
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} elsif ($ARGV[0] =~ 'MemFree') {
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$value = $vm_stats{'pages free'};
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} elsif ($ARGV[0] =~ 'Buffers') {
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$value = $vm_stats{'cached file pages'};
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} elsif ($ARGV[0] =~ 'Cached') {
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$value = $vm_stats{'anonymous pages'} +
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$vm_stats{'cached file pages'} +
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$vm_stats{'cached executable pages'};
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} elsif ($ARGV[0] =~ 'SwapTotal') {
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$value = $vm_stats{'swap pages'};
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} elsif ($ARGV[0] =~ 'SwapFree') {
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$value = $vm_stats{'swap pages'} -
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$vm_stats{'swap pages in use'};
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}
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print $value * ($page_size / 1024);
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exit(0);
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