nagios+nginx从环境搭建到配置

nagios+nginx从环境搭建到配置

   nagios是一个开源免费的系统监控工具，官网地址
    截止2011-07-27    nagios的最新版本是3.x，基于c语言编写，并提供了一个基于php和cgi的web管理界面
    

环境搭建

    nagios需要一个web容器+php的运行环境，由于现在的公司统一使用nginx作为web容器，在这里我选择了nginx+php
    nginx官网地址为    
    php官网地址为    
    
    如果对于nagios的web界面，需要根据用户配置相应的访问权限的话，那还得安装一个apache，没别的用途，就是用htpassword生成账户信息。
    apache官网地址    

    
    我所准备的jar包如下，其中spawn-fcgi是用于nginx重定向到php用的
        lighttpd-1.4.28.tar.gz
        nginx-1.0.5.tar.gz
        php-5.3.6.tar.gz
        spawn-fcgi-1.6.2.tar.gz
        
    安装nginx    

   tar nginx-1.0.5.tar.gz cd nginx-1.0.5/ ./configure --prefix=/usr/local/nginx make && make install

    注意--prefix是在指定软件的安装路径，可以根据个人情况自行修改
    安装php之前最好参考张宴的这篇博客 http://blog.s135.com/post/297/ 安装对应的图形和xml等lib，当然稍后安装也行    

   tar zxvf php-5.3.6.tar.gz cd php-5.3.6/ ./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc l --with-zlib --disable-debug --disable-rpath --enable-discard-path --enable-safe-mode --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --with-curlwrappers --enable-mbregex --enable-fastcgi --enable-force-cgi-redirect make && make install cp php.ini-dist /usr/local/php/etc/php.ini cd ../

    注意，一定要带上--enable-fastcgi --enable-force-cgi-redirect，如果执行 ./configure时 提示缺少某个包，比如zlib,gd等等，安装上即可
    
    解压缩并安装 spawn-fcgi，与张宴博客不同的是，在我写这篇博客时spawn-fcgi已经作为单独的包提供使用了

tar spawn-fcgi-1.6.2.tar.gz cd spawn-fcgi-1.6.2/ ./configure --prefix=/usr/local/spawn-fcgi make && make install

    然后仅仅是把spawn-fcgi这个文件copy去php的bin目录下，为什么仅仅只要一个文件呢？好吧，我也不知道。

cp spawn-fcgi /usr/local/php/bin chmod +x /usr/local/php/bin/spawn-fcgi

   
    启动php cgi进程

/usr/local/php/bin/spawn-fcgi -a 127.0.0.1 -p 9000 -C 250 -u www -f /usr/local/php/bin/php-cgi

  这样一来环境就搭建的差不多了，这中间容易出问题的就是php安装的时候可能会报缺某些工具包
    

安装nagios及其插件nagios-plugin

tar nagios-3.2.3.tar.gz cd nagios-3.2.3/ ./configure --prefix=/usr/local/nagios --with-gd --with-libpng --with-libjpeg make && make install

    注意，在安装gd,libpng,libjpeg时还需要安装对应的devel包才行，即gd-devel,libpng-devel,libjpeg-devel

    安装fast-cgi

    
    在很多nginx+nagios的搭建教程中都提到一个 nginx-fcgi的脚本文件，下载地址是 但当我写这篇博客时该地址已经失效了，脚本文件作为附件奉上
    
    然后启动fcgi

./nginx-fcgi -l /usr/local/logs/nginx-fcgi.log -pid /tmp/nginx-fcgi.pid -S /tmp/nginx-fcgi.sock

    注意， -pid用于指定nginx-fcgi的进程pid， 需要执行以下命令更改运行权限

chmod    777 /tmp/nginx-fcgi.sock

   

配置nginx

nagios的配置

nagios的配置文件都在/usr/local/nagios/etc下，其中    
    nagios.cfg    是主配置文件
    cgi.cfg    用于配置权限之类

    详细配置文件在/usr/local/nagios/etc/object之内，如何配置详见

    

    配置文件修改完毕后，执行命令

/usr/local/nagios/bin/nagios -pv /usr/local/nagios/etc/nagios.cfg

更新缓存，

详见

  下面是nginx-fcgi的源码

#!/usr/bin/perl
#
#    author        Daniel Dominik Rudnicki
#    thanks to:    Piotr Romanczuk
#    email        [e-mail]
#    version        0.4.3
#    webpage        http://www.nginx.eu/
#
#    BASED @ http://wiki.codemongers.com/NginxSimpleCGI
#
#
# use strict;
use FCGI;
use Getopt::Long;
use IO::All;
use Socket;

sub init {
    GetOptions(    "h"    => \$help,
            "verbose!"=>\$verbose,
            "pid=s"    => \$filepid,
            "l=s" => \$logfile,
            "S:s" => \$unixsocket,
            "P:i" => \$unixport) or usage();
        usage() if $help;

    print "    Starting Nginx-fcgi\n" if $verbose;
    print "    Running with $> UID" if $verbose;
    print "    Perl $]" if $verbose;

#    if ( $> == "0" ) {
#        print "\n\tERROR\tRunning as a root!\n";
#        print "\tSuggested not to do so !!!\n\n";
#        exit 1;
#    }

        if ( ! $logfile ) {
        print "\n\tERROR\t log file must declared\n"
            . "\tuse $0 with option -l filename\n\n";
        exit 1;
    }
    print "    Using log file $logfile\n" if $verbose;
    "\n\n" >> io($logfile);
    addlog($logfile, "Starting Nginx-cfgi");
    addlog($logfile, "Running with $> UID");
    addlog($logfile, "Perl $]");
    addlog($logfile, "Testing socket options");

    if ( ($unixsocket && $unixport) || (!($unixsocket) && !($unixport)) ) {
        print "\n\tERROR\tOnly one option can be used!\n";
        print "\tSuggested (beacuse of speed) is usage UNIX socket -S \n\n";
        exit 1;
    }

    if ($unixsocket) {
        print "    Daemon listening at UNIX socket $unixsocket\n" if $versbose;
        addlog($logfile, "Deamon listening at UNIX socket $unixsocket");
    } else {
        print "    Daemon listening at TCP/IP socket *:$unixport\n" if $verbose;
        #
        addlog($logfile, "Daemon listening at TCP/IP socket *:$unixport");
    }

    if ( -e $filepid ) {
        print "\n\tERROR\t PID file $filepid already exists\n\n";
        addlog($logfile, "Can not use PID file $filepid, already exists.");
        exit 1;
    }

    if ( $unixsocket ) {
        print "    Creating UNIX socket\n" if $verbose;
        $socket = FCGI::OpenSocket( $unixsocket, 10 );
        if ( !$socket) {
            print "    Couldn't create socket\n";
            addlog($logfile, "Couldn't create socket");
            exit 1;
        }
        print "    Using UNIX socket $unixsocket\n" if $verbose;
    } else {
        print "    Creating TCP/IP socket\n" if $verbose;
        $portnumber = ":".$unixport;
        $socket = FCGI::OpenSocket( $unixport, 10 );
        if ( !$socket ) {
            print "    Couldn't create socket\n";
            addlog($logfile, "Couldn't create socket");
            exit 1;
        }
        print " Using port $unixport\n" if $verbose;
    }
    addlog($logfile, "Socket created");

    if ( ! $filepid ) {
        print "\n\tERROR\t PID file must declared\n"
            . "\tuse $0 with option -pid filename\n\n";
        exit 1;
    }
    print "    Using PID file $filepid\n" if $verbose;
    addlog($logfile, "Using PID file $filepid");

    my $pidnumber = $$;
    $pidnumber > io($filepid);
    print " PID number $$\n" if $verbose;
    addlog($logfile, "PID number $pidnumber");

}

sub addzero {
    my ($date) = shift;
    if ($date < 10) {
        return "0$date";
    }
       return $date;
}

sub logformat {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$iddst) = localtime(time);
    my $datestring;
    $year += 1900;
    $mon++;
    $mon = addzero($mon);
    $mday = addzero($mday);
    $min = addzero($min);
    $datestring = "$year-$mon-$mday $hour:$min";
    return($datestring);
}

sub addlog {
    my ($log_file, $log_message) = @_;
    my $curr_time = logformat();
    my $write_message = "[$curr_time] $log_message";
    $write_message >> io($log_file);
    "\n" >> io($log_file);
}

sub printerror {
    my $message = @_;
    print "\n    Nginx FastCGI\tERROR\n"
        . "\t $message\n\n";
    exit 1;
}

sub usage {
    print "\n    Nginx FastCGI \n"
        . "\n\tusage: $0 [-h] -S string -P int\n"
        . "\n\t-h\t\t: this (help) message"
        . "\n\t-S path\t\t: path for UNIX socket"
        . "\n\t-P port\t\t: port number"
        . "\n\t-p file\t\t: path for pid file"
        . "\n\t-l file\t\t: path for logfile"
        . "\n\n\texample: $0 -S /var/run/nginx-perl_cgi.sock -l /var/log/nginx/nginx-cfgi.log -pid /var/run/nginx-fcgi.pid\n\n";
    exit 1;
}


init;
#
END() { } BEGIN() { }
*CORE::GLOBAL::exit = sub { die "fakeexit\nrc=".shift()."\n"; }; eval q{exit};
if ($@) {
    exit unless $@ =~ /^fakeexit/;
} ;

# fork part
my $pid = fork();

if( $pid == 0 ) {
    &main;
    exit 0;
}

print " Forking worker process with PID $pid\n" if $verbose;
addlog($logfile, "Forking worker process with PID $pid");
print " Update PID file $filepid\n" if $verbose;
addlog($logfile, "Update PID file $filepid");
$pid > io($filepid);
print "    Worker process running.\n" if $verbose;
addlog ($logfile, "Parent process $$ is exiting");
exit 0;

sub main {
    $request = FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%req_params, $socket );
    if ($request) { request_loop()};
        FCGI::CloseSocket( $socket );
}

sub request_loop {
    while( $request->Accept() >= 0 ) {
        # processing any STDIN input from WebServer (for CGI-POST actions)
        $stdin_passthrough = '';
        $req_len = 0 + $req_params{'CONTENT_LENGTH'};
        if (($req_params{'REQUEST_METHOD'} eq 'POST') && ($req_len != 0) ){
            while ($req_len) {
                $stdin_passthrough .= getc(STDIN);
                $req_len--;
            }
        }
        # running the cgi app
        if ( (-x $req_params{SCRIPT_FILENAME}) &&
            (-s $req_params{SCRIPT_FILENAME}) &&
            (-r $req_params{SCRIPT_FILENAME})
        ){
            foreach $key ( keys %req_params){
                $ENV{$key} = $req_params{$key};
            }
            if ( $verbose ) {
                addlog($logfile, "running $req_params{SCRIPT_FILENAME}");
            }
            # http://perldoc.perl.org/perlipc.html#Safe-Pipe-Opens
            #
            open $cgi_app, '-|', $req_params{SCRIPT_FILENAME}, $stdin_passthrough or print("Content-type: text/plain\r\n\r\n"); print "Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !\n"; # addlog($logfile, "Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !");

            if ($cgi_app) {
                print <$cgi_app>;
                close $cgi_app;
            }
        } else {
            print("Content-type: text/plain\r\n\r\n");
            print "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.\n";
            addlog($logfile, "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.");
        }
    }
}