Munin

Install Munin to the server

sudo apt-get install munin

Dynamic graphics

To be able to zoom in the graphics, edit /etc/munin/munin.conf and change:

html_strategy cgi
graph_strategy cgi

If using Nginx, add to your host config (ex. /etc/nginx/sites-enabled/default ):

        location /munin/static/ {
                alias /etc/munin/static/;
                expires modified +1w;
        }

#       location /munin {
#               # auth_basic            "Restricted";
#               # Create the htpasswd file with the htpasswd tool.
#               # auth_basic_user_file  /etc/nginx/htpasswd;
#
#               alias /var/cache/munin/www;
#               expires modified +310s;
#       }

        location /munin/ {
                fastcgi_split_path_info ^(/munin)(.*);
                fastcgi_param PATH_INFO $fastcgi_path_info;
                fastcgi_pass unix:/var/run/munin/fastcgi-html.sock;
                include fastcgi_params;
        }

        location ^~ /munin-cgi/munin-cgi-graph/ {
                fastcgi_split_path_info ^(/munin-cgi/munin-cgi-graph)(.*);
                fastcgi_param PATH_INFO $fastcgi_path_info;
                fastcgi_pass unix:/var/run/munin/fastcgi-graph.sock;
                include fastcgi_params;
        }

Install Munin to a client

First you need to install munin client package using the following commands

   sudo apt-get install munin-node

Now you need to edit the munin-node.conf file to specify that your monitoring server is allowed to poll the client for information.

   sudo vi /etc/munin/munin-node.conf

Search for the section that has the line "allow ^127\.0\.0\.1$". Modify the IP address to reflect your monitoring server's IP address.If your server ip is 172.30.2.100

   allow ^\.172\.30\.2\.100$

Save and exit the file

You need to restart the munin client using the following information

   sudo service munin-node restart

Now you need to login in to your munin server and edit the munin.conf file

   sudo vi /etc/munin/munin.conf

Copy the following section and change the ip address to your remote server client ip address

   [MuninMonitor]
   address 127.0.0.1
   use_node_name yes

to

   [MuninMonitor]
   address 172.30.2.101
   use_node_name yes

Finall you need to restart the apache server using the following command

   sudo service apache2 restart

Add variables

/usr/sbin/munin-node-configure --suggest
/usr/sbin/munin-node-configure --shell | sh
/etc/init.d/munin-node restart

Additional Plugins

The munin-plugins-extra package contains performance checks additional services such as DNS, DHCP, Samba, etc. To install the package run the following command from the terminal

   sudo apt-get install munin-plugins-extra

Make sure you have install this package on both the server and node machines.

Info from: http://www.ubuntugeek.com/install-munin-monitoring-tool-on-ubuntu-14-04-server.html

TCP ping plugin

Create file /usr/share/munin-marti/tcp_multi_ping'

cat tcp_multi_ping
#!/usr/bin/perl

=head1 NAME

multi_tcp_ping - Graphs together the TCP ping results for several hosts

=head1 SYNOPSIS

This plugin is meant to be called from Munin. You should set the
'hosts' environment variable from Munin's configuration (i.e.
/etc/munin/munin.conf) to specify which hosts and ports to query.

=head1 DESCRIPTION

This plugin expects to receive the following environment variables:

=over 4

=item hosts (REQUIRED!)

Comma-separated list of hosts to query. You can specify the TCP port
to connect to on each of the hosts by listing them as host:port - The
port defaults to 80. The following is a valid hosts declaration:

    hosts='192.168.0.15, 192.168.0.18:22'

It will query host 192.168.0.15 on the default port (80), as well as
host 192.168.0.18 on port 22.

=back

If the connection was opened successfully, it gives as the return
value the time it took to establish the connection. If the requested
host is not reachable, a hard-wired '-0.01' will be returned. Why
-0.01? Because giving a negative value is the best way to easily get
-visually- that something failed. Connection establishment times are
usually in the 5-500ms range. 100ms will be not too little (and thus
invisible), not too much (and thus killing the details in our graphs).

=head1 DEPENDS ON

L<Net::Ping>

=head1 SEE ALSO

L<munin>, L<munin-node>

=head1 AUTHOR

Gunnar Wolf <[email protected]>

=head1 COPYRIGHT


Copyright 2008 Gunnar Wolf, Instituto de Investigaciones
Economicas, UNAM. This plugin 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; version 2
dated June, 1991, or any later version (at your choice).

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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

=cut

use strict;
use warnings;

# This evil "eval" is to make Travis CI able to test the plugin syntax
# without having a perl built with threads.
#
# Also: The use of interpreter-based threads in perl is officially
# discouraged.
eval 'use threads; 1;' or die 'Could not use threads';

use Net::Ping;
my (%defaults, @hosts, $cmd_arg, $config_file_name);
%defaults = (port => 80, timeout => 2, unreachable => -0.01);

#$config_file_name = "/usr/share/munin/plugins/hostslist.ip";
$config_file_name = "/usr/share/munin-marti/tcp_multi_ping.ip";



open (IN_FILE,"<$config_file_name") or die "Unable to open file hostslist.ip";
while (<IN_FILE>){
# if (/\d+\.\d+\.\d+\.\d+/){
s/\s//g; push (@hosts,[$_,$defaults{port}]);
# }
}

# @hosts = get_hosts($ENV{hosts});


die "Hosts not set - cannot continue\n" unless @hosts;

$cmd_arg = $ARGV[0] || '';
config() if($cmd_arg eq "config");
autoconf() if ($cmd_arg eq 'autoconf');

for my $host (@hosts) { 
    threads->new(\&ping_host, $host)
}

map {$_->join} threads->list;
exit 0;

sub ping_host {
    my ($host, $addr, $p, $ret, $time, $ip);
    $host = shift;
    $addr = host_label_for($host);

    $p=Net::Ping->new("tcp", $defaults{timeout});
    $p->hires();
    $p->{port_num} = $host->[1] || $defaults{port};

    ($ret, $time, $ip) = $p->ping($host->[0]);

    $time = $defaults{unreachable} if !$ret;
    print "${addr}.value $time\n";
}

sub get_hosts {
    # Hosts are defined in the 'hosts' environment variable. It's a list of
    # hosts (and optionally ports) - We parse the list and arrange it neatly
    # to be easily consumed.
    my ($hostsdef, @hosts);
    $hostsdef = shift;
    return unless $hostsdef;

    for my $host (split(/,/, $hostsdef)) {
        $host =~ s/\s//g;

        $host =~ /^(?:([^:]+))
            (?::(\d+))?$/x;

        push @hosts, [$1, $2 || $defaults{port}];

    }

    return @hosts;
}

sub config {
    my @res = ("graph_title TCP connection times",
               "graph_args --base 1000 -l 0",
               "graph_vlabel seconds",
               "graph_category network",
               "graph_info Shows the time to establish a TCP connection");
    for my $host (@hosts) {
        my $addr = host_label_for($host);
        push @res, "$addr.label $addr";
        push @res, "$addr.draw LINE2";
        push @res, "$addr.info Time to establish TCP connection to " .
            "$host->[0]:$host->[1]";

    }

    print map {"$_\n"} @res;
    exit 0;
}

sub autoconf {
    print "yes\n";
    exit 0;
}

sub host_label_for {
    my ($ip, $port) = @{$_[0]};
    # Periods and colonsare not allowed in variable names
    my $addr = "src_${ip}_${port}";
    $addr =~ s/\./_/g;
    return $addr;
}

Put all your hosts to /usr/share/munin-marti/tcp_multi_ping.ip

google.com
hostssh.com:22

Create link:

ln -s '/usr/share/munin-marti/tcp_multi_ping' '/etc/munin/plugins/tcp_multi_ping'

Restart munin-node