CentOS下nginx+nagios 监控平台搭建

随着linux服务器可用性、稳定性逐步增强，企业对线上服务也要求越来越严格，需要有专门的监控系统监控服务的正常运转，并有问题及时发邮件、报警给linux SA。我们大多数nagios、cacti监控都基于apache搭建，今天我们讲一种新平台搭建nginx平台的nagios监控！

一、系统运行环境

服务器系统版本：Centos 5.3 x64
nginx版本：nginx-0.8.54
nagios版本：nagios-3.2.3

二、下载所需包

#所有安装所需的源码包：本站点集成下载：（以下包地址已经失效，请去官方网站下载相应的包）
http://blog.mgcrazy.com/download/nginx-0.8.54.tar.gz
http://blog.mgcrazy.com/download/pcre-8.01.tar.gz
http://blog.mgcrazy.com/download/nagios/FCGI-0.67.tar.gz
http://blog.mgcrazy.com/download/nagios/FCGI-ProcManager-0.18.tar.gz
http://blog.mgcrazy.com/download/nagios/nagios-3.2.3.tar.gz
http://blog.mgcrazy.com/download/nagios/nagios-plugins-1.4.13.tar.gz
http://blog.mgcrazy.com/download/nagios/nrpe-2.8.1.tar.gz
#Nginx 安装请参考：http://blog.mgcrazy.com/?p=792 【nginx安装】
nginx安装完毕后。

三、正式安装nagios

#创建nagios用户和组，并把www加入nagios管理组：
useradd nagios &&groupadd nagcmd && usermod -g nagcmd nagios && usermod -g nagcmd www
cd /usr/scr && tar xzf nagios-3.2.3.tar.gz && cd nagios-3.2.3
./configure --with-command-group=nagcmd --prefix=/usr/local/nagios && make all
make install &&make install-init && make install-config && make install-commandmode
#nagios安装完毕！

验证程序是否被正确安装。切换目录到安装路径（这里是/usr/local/nagios）,看是否存在 etc、bin、 sbin、 share、 var这五个目录，如果存在则可以表明程序被正确的安装到系统了。接下来编译并安装nagios插件 nagios-plugins

cd /usr/src &&tar zxvf nagios-plugins-1.4.13.tar.gz &&cd nagios-plugins-1.4.13
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios
make && make install
#插件安装完毕！
#ls /usr/local/nagios/libexec 会显示安装的插件文件,即所有的插件都安装在libexec这个目录下。

四、创建一个nagiosadmin用户

#用于Nagios的WEB接口登录。
#记下你所设置的登录口令，一会儿你会用到它
这里要借助于apche的htpasswd，在有apache机器上执行下列命令
/usr/local/apache2/bin/htpasswd -c /usr/local/nagios/etc/htpasswd nagiosadmin
输入两次一样的密码即可。
chkconfig –add nagios
#添加到service 中，chkconfig nagios –level 35 on 设置成开机启动。
#把selinux、iptables关闭，或者更改iptables策略需要访问nagios
#然后启动nagios
/etc/init.d/nagios start

五、安装Perl FCGI

#安装php可参考 http://chinaapp.sinaapp.com/thread-627-1-1.html
#安装FCGI
cd /usr/src && tar -zxvf FCGI-0.67.tar.gz &&cd FCGI-0.67 && perl Makefile.PL
make && make install
#安装FCGI-ProcManager:
cd ../ && tar -xzxf FCGI-ProcManager-0.18.tar.gz &&cd FCGI-ProcManager-0.18
perl Makefile.PL &&make && make install
#安装完毕即可。
mkdir -p /usr/local/nagios/share/nagios
ln -s /usr/local/nagios/share/images /usr/local/nagios/share/nagios/images
ln -s /usr/local/nagios/share/stylesheets /usr/local/nagios/share/nagios/stylesheets
#避免无法显示图片。

接下来配置cgi脚本、nginx配置文件： cd /usr/local/nagios/bin/ 下新建文件，并写入以下内容 vi perl-cgi.pl

#!/usr/bin/perl
use FCGI;
#perl -MCPAN -e ‘install FCGI’
use Socket;
#this keeps the program alive or something after exec’ing perl scripts
END()
{
}
BEGIN()
{
}
*CORE::GLOBAL::exit
=
sub
{
die
“fakeexit\nrc=”.shift().”\n”;
};
eval
q{exit};
if
($@)
{
exit
unless
$@
=~
/^fakeexit/;
}
;
&main;
sub main {
#$socket = FCGI::OpenSocket( “:3461″, 10 ); #use IP sockets
$socket
= FCGI::OpenSocket(
“/var/run/nagios.sock”,
10
);
#use UNIX sockets – user running this script must have w access to the ‘nginx’ folder!!
$request
= FCGI::Request(
\*STDIN,
\*STDOUT,
\*STDERR,
\%ENV,
$socket
);
if
($request)
{request_loop()};
FCGI::CloseSocket(
$socket
);
}
sub request_loop {
while(
$request->Accept()
>=
0
)
{
#processing any STDIN input from WebServer (for CGI-GET actions)
$env
=
$request->GetEnvironment();
$stdin_passthrough
=”;
$req_len
=
0
+
$ENV{CONTENT_LENGTH};
if
($ENV{REQUEST_METHOD}
eq
‘GET’){
$stdin_passthrough
.=
$ENV{‘QUERY_STRING’};
}
#running the cgi app
if
(
(-x $ENV{SCRIPT_FILENAME})
&&
#can I execute this?
(-s
$ENV{SCRIPT_FILENAME})
&&
#Is this file empty?
(-r $ENV{SCRIPT_FILENAME})
#can I read this file?
){
#http://perldoc.perl.org/perlipc.html#Safe-Pipe-Opens
open
$cgi_app,
‘-|’,
$ENV{SCRIPT_FILENAME},
$stdin_passthrough
or
print(“Content-type: text/plain\r\n\r\n”);
print
“Error: CGI app returned no output – Executing $ENV{SCRIPT_FILENAME} failed !\n”;
if
($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_len – $ENV{CONTENT_LENGTH} – $ENV{REQUEST_METHOD} – $ENV{SCRIPT_FILENAME} may not exist or is not executable by this process.\n”;
}
}
}
#设置权限chmod +x perl-cgi.pl 即可！

以下是我的nginx.conf文件server内容

server
{
listen 80;
server_name 192.168.2.79;
root /usr/local/nagios/share;
index index.php;
auth_basic “You Name”;
auth_basic_user_file /usr/local/nagios/etc/htpasswd;
log_format nagios ‘$remote_addr – $remote_user [$time_local] “$request” ‘
‘$status $body_bytes_sent “$http_referer” ‘
‘”$http_user_agent” $http_x_forwarded_for’;
access_log /usr/local/nginx/nagios.log nagios;
location ~ .*\.(php|php5)?$
{
#fastcgi_pass unix:/tmp/php-cgi.sock;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
}
location ~ \.cgi$ {
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
fastcgi_index index.cgi;
fastcgi_pass unix:/var/run/nagios.sock;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param REMOTE_USER $remote_user;
#默认没有红色这一句，如果没有，后面nagios页面会报错，具体错误后面给出。
#fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_NAME $server_name;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param SERVER_SOFTWARE nginx;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param HTTP_ACCEPT_ENCODING gzip,deflate;
fastcgi_param HTTP_ACCEPT_LANGUAGE zh-cn;
}

fcgi.conf文件内容如下

fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
# PHP only, required if PHP was built with –enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;

以上可以把nginx中fastcGI部分整合到fcgi.conf中

启动nginx，确定有fastcGI 9000端口。后台启动screen ./perl-cgi.pl >/dev/null
ctrl +a +d 退出screen
然后chmod 777 /var/run/nagios.sock ；并且重启service nagios restart

六、安装完毕，然后访问：

直接访问 http://192.168.2.79 会弹出登录框，输入用户名nagiosadmin 和密码，会看到nagios默认监控localhost！页面如下：而且点击详细服务关闭报警，也不报错:

自此，nginx+nagios 环境搭建完毕！剩下的就是具体监控客户端的配置啦！文章后续给出！

本文环境已经测试通过，搭建的时候，也遇到了好多例如403、502、504等等系列问题，一点一滴的解决。一件事只有你真正做过，你才会感觉到学到很多东西。如下的报错：

#It seems that you have chosen to not use the authentication functionality of the CGIs.
I don't want to be personally responsible for what may happen as a result of allowing
unauthorized users to issue commands to Nagios,so you'll have to disable this safeguard if you
are really stubborn and want to invite trouble.
#It appears as though you do not have permission to view information for any of the hosts you requested...
If you believe this is an error, check the HTTP server authentication requirements for accessing this CGI
and check the authorization options in your CGI configuration file
可参照修改：http://hi.baidu.com/shengit/blog/item/b21b770965c6e8de62d986c0.html

本文参考文章链接

http://bbs.linuxtone.org/thread-4441-1-1.html
http://bbs.linuxtone.org/thread-7404-1-1.html
http://www.comeonsa.com/

本文出自 “吴光科-专注自动化运维” 博客，请务必保留此出处http://wgkgood.blog.51cto.com/1192594/523150

(责任编辑：IT)

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