Pinger

+--------+
| pinger |
+--------+

Ubuntu 14.04.1 Server amd64

Install OpenSSH server
# apt-get install openssh-server

SSH into the Pinger server using Putty (or another SSH client)

Become root
# sudo su

Create necessary files and folders
# mkdir /pinger
# cd /pinger
# mkdir logs
# mkdir old_logs
# mkdir unreachable
# touch nodes
# nano pinger.sh
Copy and Paste the following:

#!/bin/bash
to_address='email@domain.com'
timestamp=date +%m-%d_%H:%M:%S
while read node; do
response=$(ping -c1 $node |head -2 |tail -1)
if [ -z "$response" ]; then
response="Unreachable"
echo $timestamp > /pinger/unreachable/$node
mail -s "unreachable - $node" $to_address <<< $timestamp
elif [ -e "/pinger/unreachable/$node" ]; then
if [[ $response =~ "Unreachable" ]]; then
response="Unreachable"
else
rm /pinger/unreachable/$node
response=$(echo "$response" |awk -F "time=" '{ print $2 }')
mail -s "reachable again - $node" $to_address <<< $timestamp
fi
else
response=$(echo "$response" |awk -F "time=" '{ print $2 }')
fi
log="$timestamp - $response"
echo $log >> /pinger/logs/$node
done </pinger/nodes

  Ctrl-X
  Y
  Enter

# nano rotatelogs.sh
#!/bin/bash
new_dir=date +%m-%d-%y
mkdir /pinger/old_logs/$new_dir
mv /pinger/logs/* /pinger/old_logs/$new_dir

Make pinger.sh and rotatelogs.sh executable
# chmod u+x pinger.sh
# chmod u+x rotatelogs.sh

Add a node to be pinged
# echo "dnsname" >> nodes
# echo "ipaddress" >> nodes

Install msmtp
# apt-get install msmtp-mta
# nano ~/.msmtprc
defaults
logfile ~/msmtp.log
account gmail
auth on
host smtp.gmail.com
from your_address@gmail.com
auth on
tls on
tls_trust_file /usr/share/ca-certificates/mozilla/Equifax_Secure_CA.crt
user your_address@gmail.com
password your_gmail_password
port 587
account default : gmail
# chmod 600 ~/.msmtprc

Install mailx
# apt-get install heirloom-mailx
# nano ~/.mailrc
set sendmail="/usr/bin/msmtp"
set message-sendmail-extra-arguments="-a gmail"

Create Cron to run pinger.sh (every minute) and rotatelogs.sh (every week)
# crontab -e
* * * /pinger/pinger.sh
0 0 * * 0 /pinger/rotatelogs.sh

==========
Optional
==========

Install Apache
# apt-get install apache2
# echo "ServerName localhost" | sudo tee /etc/apache2/conf-available/fqdn.conf && sudo a2enconf fqdn

Install PHP5
# libapache2-mod-php5

Restart Apache
# service apache2 restart

Create necessary HTML and PHP files
# cd /var/www/html
# rm index.html
# nano index.html


<title>pinger</title>
<script><br> function init(){<br> getData("nodes");<br> }<br> function getData(type,node){<br> var ajax = new XMLHttpRequest();<br> var url = "getData.php?type=" + type;<br> if (node)<br> url += "&amp;node=" + node;<br> ajax.open("GET", url, false);<br> ajax.send();<br> var text = ajax.responseText;<br> if (type == "nodes"){<br> var json = JSON.parse(text);<br> var size = json.nodes.length;<br> var node = "";<br> text = "";<br> for (i=0;i&lt;size;i++){<br> node = json.nodes<a class="alink notfound" href="i">[i]</a>.name;<br> text += "<a id=\"" + node + "\" href=\"javascript:getData('logs','" + node + "')\" onmouseover=\"getData('logs','" + node + "')\" onmouseout=\"clearLogs()\">" + node + "</a></br>";<br> }<br> getID(type).innerHTML = text;<br> if (json.unreachable){<br> size = json.unreachable.length;<br> for (i=0;i&lt;size;i++)<br> getID(json.unreachable<a class="alink notfound" href="i">[i]</a>.name).style.color = "red";<br> }<br> setTimeout("getData(\"nodes\")",30000);<br> }<br> else<br> getID(type).innerHTML = text;<br> }<br> function clearLogs(){getID("logs").innerHTML = "";}<br> function getID(id){return document.getElementById(id);}<br> </script>
<style><br> body {background-color:black;color:#009bd5;font-family:arial;font-size:14}<br> a {color:#009bd5;text-decoration:none}<br> a:hover {color:white}<br> #logs {position:fixed;top:8;left:250;color:white}<br> </style>

# nano getData.php
<?php
if ($_GET["type"] == "nodes"){
$nodes = file('/pinger/nodes', FILE_IGNORE_NEW_LINES);
sort($nodes);
$json = "{\"nodes\":[";]
foreach ($nodes as $node)
$json .= "{\"name\":\"" . $node . "\"},";
$json = rtrim($json, ",");
$unreachable = array_slice(scandir('/pinger/unreachable'), 2);
if (count($unreachable)){
$json .= ",\"unreachable\":[";]
foreach ($unreachable as $node)
$json .= "{\"name\":\"" . $node . "\"},";
$json = rtrim($json, ",");
}
$json .= "}";
echo $json;
}
else {
$logs = file("/pinger/logs/" . $_GET["node"], FILE_IGNORE_NEW_LINES);
if (count($logs) > 30)
$logs = array_slice($logs, -30);
foreach ($logs as $log)
echo substr($log, 6) . "
";
}
?>

Go to IP Address of "pinger" server in a browser
Reachable nodes are "blue"
Unreachable nodes are "red"
Hover over node name to see last 30 minutes of response times
Page refreshes every 30 seconds automatically