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 http://www.nagios.org/
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 http://nginx.org/

php官网地址为 http://www.php.net/

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 http://httpd.apache.org/

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

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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

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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

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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

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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

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tar nagios-plugins-1.4.15.tar.gz
cd nagios-plugins-1.4.15/
./configure --prefix=/usr/local/nagios --with-gd --with-libpng --with-libjpeg
make && make install

安装fast-cgi

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tar FCGI-ProcManager-0.19.tar.gz
cd FCGI-ProcManager-0.19/
./configure --prefix=/usr/local/fcgi
make && make install

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 http://www.nginx.eu/nginx-fcgi/nginx-fcgi.txt 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

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cd /usr/local/nginx/conf
vi nginx.conf

添加如下设置

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server {
listen 80;
server_name nagios.test.com;
root /usr/local/nagios/share;
index index.html index.htm index.php default.html default.htm default.php;

location ~ .*\.php?$ {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fastcgi.conf;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/share$fastcgi_script_name;
auth_basic "nagios admin";
auth_basic_user_file /usr/local/nagios/etc/nagiosAdmin.net;
}
location ~ .*\.cgi$ {
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
fastcgi_pass unix:/tmp/nginx-fcgi.sock;
fastcgi_index index.cgi;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;
include fastcgi.conf;
auth_basic "nagios admin";
auth_basic_user_file /usr/local/nagios/etc/nagiosAdmin.net;

}
location /nagios {
alias /usr/local/nagios/share;
auth_basic "nagios admin";
auth_basic_user_file /usr/local/nagios/etc/nagiosAdmin.net;

}
location ~ .*\.pl$ {
fastcgi_pass unix:/tmp/nginx-fcgi.sock;
fastcgi_index index.pl;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;
include fastcgi.conf;
}
}

其中 auth_basic和auth_basic_user_file用于指定该种URI的访问权限，对应的 /usr/local/nagios/etc/nagiosAdmin.net 需要事先用htpasswd命令生成

后缀为.php的URI用

fastcgi_pass 127.0.0.1:9000;

fastcgi_index index.php;

来指定给spawn-cgi处理

后缀为.cgi的URI用

root /usr/local/nagios/sbin;

rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;

fastcgi_pass unix:/tmp/nginx-fcgi.sock;

fastcgi_index index.cgi;

fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;

include fastcgi.conf;

指定给刚才启动的nginx-fcgi进程处理，注意nagios的php程序都在/usr/local/nagios/share 下，而cgi程序都在/usr/local/nagios/sbin下，别搞错路径

之后就是启动nagios,nginx，在你当前机器设置host后访问 http://nagios.test.com 查看web内容

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 http://nagios-cn.sourceforge.net/nagios-cn/cgiconfig.html
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http://nagios-cn.sourceforge.net/nagios-cn

下面是nginx-fcgi的源码

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#!/usr/bin/perl
#
# author Daniel Dominik Rudnicki
# thanks to: Piotr Romanczuk
# email daniel@sardzent.org
# 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 {1}gt; UID" if $verbose;
print " Perl $]" if $verbose;

# if ( {1}gt; == "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 {1}gt; 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}) &&
(-r $req_params{SCRIPT_FILENAME})
){
foreach $key ( keys %req_params){
$ENV{$key} = $req_params{$key};
}
if ( $verbose ) {
addlog($logfile, "running $req_params{SCRIPT_FILENAME}");
} else {
addlog($logfile, "running $req_params{SCRIPT_FILENAME} fail");
}
# 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 ($cgi_app) {
addlog($logfile, "$cgi_app is ok.\n");
print <$cgi_app>;
close $cgi_app;
} else {
addlog($logfile, "$cgi_app is not ok!\n");
}
} else {
print("Content-type: text/plain\r\n\r\n");
print "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process. File Again!!\n";
addlog($logfile, "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.");
}
}
}