我修改了一个现成的 Nagios 插件 perl 脚本，使其（理论上）根据远程 Linux 服务器上文件的存在与否返回 1 或 0。该脚本运行远程 ssh 会话并以 nagios 用户身份登录。远程 Linux 服务器为该用户设置了私钥，在 bash 命令行上，该脚本按预期工作，但当作为插件运行时，即使文件不存在，它也始终返回“1”（真）。如果能提供一些有关逻辑的帮助或关于 Nagios 中为什么事情没有按预期工作的评论，我将不胜感激。我宁愿使用这种 ssh 登录方法，而不愿在所有 Linux 服务器上安装 nrpe。
从命令行运行（假设远程服务器有一个名为 nagios 的用户并具有有效的私钥）：
./check_reboot_required -e ssh -H remote-servers-ip-addr -p 'filename-to-check' -v
哒。
#! /usr/bin/perl -w
#
#
# License Information:
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
############################################################################
use POSIX;
use strict;
use Getopt::Long;
use lib "/usr/lib/nagios/plugins" ;
use vars qw($host $opt_V $opt_h $opt_v $verbose $PROGNAME $pattern $opt_p $mmin $opt_e $opt_t $opt_H $status $state $msg $msg_q $MAILQ $SHELL $device $used $avail $percent $fs $blocks $CMD $RMTOS);
use utils qw(%ERRORS &print_revision &support &usage );
sub print_help ();
sub print_usage ();
sub process_arguments ();
$ENV{'PATH'}='';
$ENV{'BASH_ENV'}='';
$ENV{'ENV'}='';
$PROGNAME = "check_reboot_required";
Getopt::Long::Configure('bundling');
$status = process_arguments();
if ($status){
print "ERROR: processing arguments\n";
exit $ERRORS{'UNKNOWN'};
}
$SIG{'ALRM'} = sub {
print ("ERROR: timed out waiting for $CMD on $host\n");
exit $ERRORS{'WARNING'};
};
$host = $opt_H;
$pattern = $opt_p;
print "Pattern >" . $pattern . "< " if $verbose;
alarm($opt_t);
#$CMD = "/usr/bin/find " . $pattern . " -type f 2>/dev/null| /usr/bin/wc -l";
$CMD = "[ -f " . $pattern . " ] && echo 1 || echo 0";
alarm($opt_t);
## get cmd output from remote system
if (! open (OUTPUT, "$SHELL $host $CMD|" ) ) {
print "ERROR: could not open $CMD on $host\n";
exit $ERRORS{'UNKNOWN'};
}
my $perfdata = "";
my $state = "3";
my $msg = "Indeterminate result";
# only first line is relevant in this iteration.
while (<OUTPUT>) {
my $result = chomp($_);
$msg = $result;
print "Shell returned >" . $result . "< length is " . length($result) . " " if $verbose;
if ( $result == 1 ) {
$msg = "Reboot required (NB: Result still not accurate)" . $result ;
$state = $ERRORS{'WARNING'};
last;
} elsif ( $result == 0 ) {
$msg = "No reboot required (NB: Result still not accurate) " . $result ;
$state = $ERRORS{'OK'};
last;
}
else {
$msg = "Output received, but it was neither a 1 nor a 0" ;
last;
}
}
close (OUTPUT);
print "$msg | $perfdata\n";
exit $state;
#####################################
#### subs
sub process_arguments(){
GetOptions
("V" => \$opt_V, "version" => \$opt_V,
"v" => \$opt_v, "verbose" => \$opt_v,
"h" => \$opt_h, "help" => \$opt_h,
"e=s" => \$opt_e, "shell=s" => \$opt_e,
"p=s" => \$opt_p, "pattern=s" => \$opt_p,
"t=i" => \$opt_t, "timeout=i" => \$opt_t,
"H=s" => \$opt_H, "hostname=s" => \$opt_H
);
if ($opt_V) {
print_revision($PROGNAME,'$Revision: 1.0 $ ');
exit $ERRORS{'OK'};
}
if ($opt_h) {
print_help();
exit $ERRORS{'OK'};
}
if (defined $opt_v ){
$verbose = $opt_v;
}
if (defined $opt_e ){
if ( $opt_e eq "ssh" ) {
if (-x "/usr/local/bin/ssh") {
$SHELL = "/usr/local/bin/ssh";
} elsif ( -x "/usr/bin/ssh" ) {
$SHELL = "/usr/bin/ssh";
} else {
print_usage();
exit $ERRORS{'UNKNOWN'};
}
} elsif ( $opt_e eq "rsh" ) {
$SHELL = "/usr/bin/rsh";
} else {
print_usage();
exit $ERRORS{'UNKNOWN'};
}
} else {
print_usage();
exit $ERRORS{'UNKNOWN'};
}
unless (defined $opt_t) {
$opt_t = $utils::TIMEOUT ; # default timeout
}
unless (defined $opt_H) {
print_usage();
exit $ERRORS{'UNKNOWN'};
}
return $ERRORS{'OK'};
}
sub print_usage () {
print "Usage: $PROGNAME -e <shell> -H <hostname> -p <directory/file pattern> [-t <timeout>] [-v verbose]\n";
}
sub print_help () {
print_revision($PROGNAME,'$Revision: 0.1 $');
print "\n";
print_usage();
print "\n";
print " Checks for the presence of a 'reboot-required' file on a remote host via SSH or RSH\n";
print "-e (--shell) = ssh or rsh (required)\n";
print "-H (--hostname) = remote server name (required)";
print "-p (--pattern) = File pattern for find command (default = /var/run/reboot-required)\n";
print "-t (--timeout) = Plugin timeout in seconds (default = $utils::TIMEOUT)\n";
print "-h (--help)\n";
print "-V (--version)\n";
print "-v (--verbose) = debugging output\n";
print "\n\n";
support();
}