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Found at: raymii.org:70/Bash_PHP_Server_Status_Monitor.txt

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Title       : 	Ray-Mon - PHP and Bash server status monitoring
Author      : 	Remy van Elst
Date        : 	22-10-2012
URL         : 	https://raymii.org/s/software/Bash_PHP_Server_Status_Monitor.html
Format      : 	Markdown/HTML

I'm developing an open source monitoring app called Leaf Node Monitoring, for windows, linux & android. Go check it out!

Consider sponsoring me on Github. It means the world to me if you show your appreciation and you'll help pay the server costs.

You can also sponsor me by getting a Digital Ocean VPS. With this referral link you'll get $100 credit for 60 days.

Ray-Mon is a linux server monitoring script written in PHP and Bash, utilizing
JSON as data storage. It requires only bash and a webserver on the client side,
and only php on the server side. The client currently supports monitoring
processes, uptime, updates, amount of users logged in, disk usage, RAM usage and
network traffic.
#### Features
  * Ping monitor
  * History per host
  * Threshold per monitored item.
  * Monitors: 
    * Processes (lighttpd, apache, nginx, sshd, munin etc.) 
    * RAM
    * Disk
    * Uptime
    * Users logged on
    * Updates
    * Network (RX/TX)
#### Download
Either _git clone_ the github repo:
    git clone git://github.com/RaymiiOrg/raymon.git
Or download the zipfile from github:
Or download the zipfile from Raymii.org
This is the github page: 
#### Changelog
##### v0.0.2
  * Server side now only requires 1 script instead of 2.
  * Client script creates the json better, if a value is missing the json file doesn't break.
  * Changed the visual style to a better layout.
  * Thresholds implemented and configurable.
  * History per host now implemented.
##### v0.0.1
  * Initial release
#### Install
##### Client
The client.sh script is a bash script which outputs JSON. It requires root
access and should be run as root. It also requires a webserver, so that the
server can get the json file.
Software needed for the script:
  * bash 
  * awk 
  * grep 
  * ifconfig
  * package managers supported: apt-get, yum and pacman (debian/ubuntu, centos/RHEL/SL, Arch)
Setup a webserver (lighttpd, apache, boa, thttpd, nginx) for the script output.
If there is already a webserver running on the server you dont need to install
another one.
Edit the script:
Network interfaces. First one is used for the IP, the second one is used for
bandwidth calculations. This is done because openVZ has the "venet0" interface
for the bandwidth, and the venet0:0 interface with an IP. If you run bare-metal
or KVM or vserver etc. you can set these two to the same value (eth0 eth1 etc).
    # Network interface for the IP address
    # network interface for traffic monitoring (RX/TX bytes)
The IP address of the server, this is used by me when deploying this script via
chef or ansible. You can set it, but it is not required.
Services are checked by doing a _ps_ to see if the process is running. The last
service should be defined without a comma, for valid JSON. The code below
monitors "sshd", "lighttpd", "munin-node" and "syslog".
    if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n ""$SERVICE" : "running","; else echo -n ""$SERVICE" : "not running","; fi
    if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n ""$SERVICE" : "running","; else echo -n ""$SERVICE" : "not running","; fi
    if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n ""$SERVICE" : "running","; else echo -n ""$SERVICE" : "not running","; fi
    if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n ""$SERVICE" : "running""; else echo -n ""$SERVICE" : "not running""; fi
To add a service, copy the 2 lines and replace the SERVICE=processname with the
actual process name:
    if ps ax | grep -v grep | grep $SERVICE > /dev/null; then echo -n ""$SERVICE" : "running","; else echo -n ""$SERVICE" : "not running","; fi
And, make sure the last service montiored does not echo a comma at the end, else
the JSON is not valid and the php script fails.
Now setup a cronjob to execute the script on a set interval and save the JSON to
the webserver directory.
As root, create the file /etc/cron.d/raymon-client with the following contents:
    */5 * * * * root /root/scripts/client.sh | sed ':a;N;$!ba;s/n//g' > /var/www/stat.json
In my case, the client script is in _/root/scripts_ , and my webserver directory
is _/var/www_. Change this to your own setup. Also, you might want to change the
time interval. */5 executes every 5 minutes. The sed line is in there to remove
the newlines, this creates a shorter JSOn file, saves some KB's. The _root_
after the cron time is special for a file in _/etc/cron.d/_ , it tells cron as
which user it has to execute the crontab file.
When this is setup you should get a stat.json file in the /var/www/ folder
containing the status json. If so, the client is setup correctly.
##### Server
The status server is a php script which fetches the json files from the clients
every 5 minutes, saves them and shows them. It also saves the history, but that
is defined below.
  * Webserver with PHP (min. 5.2) and write access to the folder the script is located.
Create a new folder on the webserver and make sure the webserver user (www-data)
can write to it.
Place the php file "stat.php" in that folder.
Edit the host list in the php file to include your clients:
The first parameter is the filename the json file is saved to, and the second is
the URL where the json file is located.
                    'example1.org.json' => 'http://example1.org/stat.json',
                    'example2.nl.json' => 'http://example2.nl/stat.json',
                    'special1.network.json' => 'http://special1.network.eu:8080/stat.json',
                    'special2.network.json' => 'https://special2.network.eu/stat.json'
Edit the values for the ping monitor:
    $pinglist = array(
Edit the threshold values:
    ## Set this to "secure" the history saving. This key has to be given as a parameter to save the history.
    $historykey = "8A29691737D";
    #the below values set the threshold before a value gets shown in bold on the page.
    # Max updates available
    $maxupdates = "10";
    # Max users concurrently logged in
    $maxusers = "3";
    # Max load.
    $maxload = "2";
    # Max disk usage (in percent)
    $maxdisk = "75";
    # Max RAM usage (in percent)
    $maxram = "75";
###### History
To save the history you have to setup a cronjob to get the status page with a
special "history key". You define this in the stat.php file:
    ## Set this to "secure" the history saving. This key has to be given as a parameter to save the history.
    $historykey = "8A29691737D";    
And then the cronjob to get it:
    ## This saves the history every 8 hours. 
    30 */8 * * * wget -qO /dev/null http://url-to-status.site/status/stat.php?action=save&&key=8A29691737D
The cronjob can be on any server which can access the status page, but
preferably on the host where the status page is located.
   [1]: http://i.imgur.com/AccDKyZ.png
   [2]: https://www.digitalocean.com/?refcode=7435ae6b8212
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