nagios从apache平台转nginx配置

刚装好nagios，和cacti整合起来了。cacti使用的是nginx，所以现在想把nagios从apache平台上转到nginx上。

nginx需要perl cgi支持才能保证nagios的运行，所以要安装perl cgi环境

1、装PERL的FCGI模块

#perl -MCPAN -e 'install FCGI'
#perl -MCPAN -e 'install FCGI::ProcManager'

2、编写perl启动脚本，运行这个脚本生成的sock文件就是我们需要的。

#vi /usr/local/bin/fastcgi.pl

#!/usr/bin/perl

use FCGI;
#perl -MCPAN -e 'install FCGI'
use Socket;
use POSIX qw(setsid);
#use Fcntl;

require 'syscall.ph';

&daemonize;

#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 daemonize() {
chdir '/'                 or die "Can't chdir to /: $!";
defined(my $pid = fork)   or die "Can't fork: $!";
exit if $pid;
setsid                    or die "Can't start a new session: $!";
umask 0;
}

sub main {
#$socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 ); #use IP sockets
$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock", 10 ); #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!
$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) ){
my $bytes_read = 0;
while ($bytes_read < $req_len) {
my $data = '';
my $bytes = read(STDIN, $data, ($req_len - $bytes_read));
last if ($bytes == 0 || !defined($bytes));
$stdin_passthrough .= $data;
$bytes_read += $bytes;
}
}

#running the cgi app
if ( (-x $req_params{SCRIPT_FILENAME}) &&  #can I execute this?
(-s $req_params{SCRIPT_FILENAME}) &&  #Is this file empty?
(-r $req_params{SCRIPT_FILENAME})     #can I read this file?
){
pipe(CHILD_RD, PARENT_WR);
my $pid = open(KID_TO_READ, "-|");
unless(defined($pid)) {
print("Content-type: text/plain\r\n\r\n");
print "Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !\n";
next;
}
if ($pid > 0) {
close(CHILD_RD);
print PARENT_WR $stdin_passthrough;
close(PARENT_WR);

while(my $s = <KID_TO_READ>) { print $s; }
close KID_TO_READ;
waitpid($pid, 0);
} else {
foreach $key ( keys %req_params){
$ENV{$key} = $req_params{$key};
}
# cd to the script's local directory
if ($req_params{SCRIPT_FILENAME} =~ /^(.*)\/[^\/]+$/) {
chdir $1;
}

close(PARENT_WR);
close(STDIN);
#fcntl(CHILD_RD, F_DUPFD, 0);
syscall(&SYS_dup2, fileno(CHILD_RD), 0);
#open(STDIN, "<&CHILD_RD");
exec($req_params{SCRIPT_FILENAME});
die("exec failed");
}
}
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";
}

}
}

3、给文件加执行权限。

chmod +x  /usr/local/bin/fastcgi.pl

执行之前先确认/var/run/nginx/这个文件夹存在，没有mkdir /var/run/nginx/

否则执行会报错：bind/listen: 没有那个文件或目录

执行之后查看/var/run/nginx目录下是不是多了一个perl_cgi-dispatch.sock文件

4、到nginx配置文件里添加，下面是我的配置

server
{
listen 80;
server_name nagios.zdworks.com;
root /usr/local/nagios/share;
index index.php;
#设置编码方式，我没有加上这个的话界面部分乱码。很奇怪为什么不是全部乱码
charset utf-8;

location ~ .*\.(php|php5)?$
{
#root /usr/local/nagios/share;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
fastcgi_param HTTP_ACCEPT_LANGUAGE zh-cn;
#fastcgi_params文件以自己的路径为准，我使用了绝对路径
include      /etc/nginx/fastcgi_params;
auth_basic "Nagios Login pain";
#认证的文件名和路径按自己的修改
auth_basic_user_file /usr/local/nagios/etc/htpasswd.users;
}
location ~ .*\.cgi$ {
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
#这个就是前面生成的sock文件，这个设置错误cgi文件就没有办法显示
fastcgi_pass unix:/var/run/nginx/perl_cgi-dispatch.sock;
fastcgi_index index.cgi;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin/$fastcgi_script_name;
include      /etc/nginx/fastcgi_params;
fastcgi_param AUTH_USER $remote_user;
fastcgi_param REMOTE_USER $remote_user;
auth_basic "Nagios Login pain";
auth_basic_user_file /usr/local/nagios/etc/htpasswd.users;
}
location /nagios {
alias /usr/local/nagios/share/;
}
}

没有装cgi前我nginx日志错误

[error] 13964#0: *27 FastCGI sent in stderr: "PHP Warning:  Unexpected character in input:  ' in /usr/local/nagios/sbin/status.cgi on line 194
PHP Parse error:  syntax error, unexpected '<' in /usr/local/nagios/sbin/status.cgi on line 194" while reading response header from upstream, client: 192.168.1.180, server: nagios.com, request: "GET /nagios/cgi-bin/status.cgi?hostgroup=all&style=summary HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "nagios.com", referrer: "http://nagios.com/side.php"

这个是cgi没有装好才会报的错。