Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.

1. On-demand self-service: every consumer will be able to unilaterally provision multiple computing capabilities like server time, storage, bandwidth, dedicated RAM or CPU without requiring any sort of human interaction from their respective Cloud providers.
2. Rapid elasticity and scalability: all the computing capabilities outlined above can be elastically provisioned and released depending on how much demand my company will have in a specific period of time. Suppose the X company is launching a new product today and it expects a very large number of customers. The X company will add more resources to their Cloud for the very first days (where they suppose the load to be very high) and then it ll scale the resources back as they were before. Elasticity and scalability permit the X company to improve and enhance their infrastructure when they need it with an huge saving in monetary terms.
3. Broad network access: capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms (e.g., mobile phones, tablets, laptops, and workstations).
4. Measured service: Cloud systems allow maximum transparency between the provider and the consumer, the usage of all the resources is monitored, controlled, and reported. The consumer knows how much will spend, when and in how long.
5. Resource pooling: each provider s computing resources are pooled to serve multiple consumers at the same time. The consumer has no control or knownledge over the exact location of the provided resources but may be able to specify location at a higher level of abstraction (e.g., country, state, or datacenter).
6. Resources price: when buying a Cloud service make sure the cost for two units of RAM, storage, CPU, bandwidth, server time is exactly the double of the price of one unit of the same capability. An example, if a provider offers you one hour of bandwitdh for 1 Euro, the price of two hours will have to be 2 Euros.

Compliance with Laws and Law Enforcement Requests; Protection of DropBox s Rights. We may disclose to parties outside Dropbox files stored in your Dropbox and information about you that we collect when we have a good faith belief that disclosure is reasonably necessary to (a) comply with a law, regulation or compulsory legal request; (b) protect the safety of any person from death or serious bodily injury; (c) prevent fraud or abuse of DropBox or its users; or (d) to protect Dropbox s property rights. If we provide your Dropbox files to a law enforcement agency as set forth above, we will remove Dropbox s encryption from the files before providing them to law enforcement. However, Dropbox will not be able to decrypt any files that you encrypted prior to storing them on Dropbox.

• Akismet. This plugin checks your comments against the Akismet web service to see if they look like spam or not and lets you review the spam it catches under your blog s Comments admin screen.
• All in one Favicon. The following plugin adds a Favicon to your site and the WordPress admin pages. It currently supports all three Favicon types (ico,png,gif).
• Digg Digg. This plugin adds a floating bar with several share buttons directly on your posts. Readers will be able to share to Google+, Facebook, Twitter, Reddit, Stumbleupon with just one click. A must have.
• Flexi Pages Widget is a highly configurable WordPress sidebar widget to list pages and sub-pages. Also, if you are using a Child theme and your Home-link doesn t appear in your Pages navigation menu without either modifying the functions.php or adding the page manually through the Pages menu, this plugin will do the work for you. You are one click away from fixing many pages-related problems.
• Google Analyticator, it adds the necessary JavaScript code to enable Google Analytics. Includes widgets for Analytics data display.
• Google Authenticator will add a two-step-authentication for your blog. This will require you to own an Android or an iPhone though. After verifying your phone with the plugin your login prompt will have one more field called Google Authenticator Code , accessing your blog won t be possible without the code generated by the authenticator every 30 seconds.
• Google XML Sitemaps will generate a special XML sitemap which will help search engines to better index your blog.
• WordPress Backup to Dropbox. Your hosting doesn t provide you with a backup solution or it provides it with an excessive cost? Don t worry, this plugin will keep your valuable WordPress website, its media and database backed up to Dropbox. You can select how often the backup should run, you can exclude huge files from being backed up, everything with one single and easy interface.
• Social broadcasts posts to Twitter and/or Facebook, pull in reactions from each (replies, retweets, comments, likes ) as comments. Social will aggregate the various mentions, retweets, @replies, comments and responses and republish them as WordPress comments.
• SEO Ultimate is a powerful all-in-one SEO plugin, available free for WordPress bloggers. You can take control of your on-page SEO with user-friendly settings and tools for optimizing your titles, meta data, robots tags, canonicalization, autolinks, post slugs, and much more.
• Jetpack adds many features that were available to WordPress.com users but they weren t present on self-hosted WordPress installs. Jetpack is a plugin that connects to WordPress.com and enables awesome features. I simply love the combo of Jetpack and the Follow button based on it. Readers will be able to subscribe to your blog and receive mail notifications whenever a new article will be published. Another handy feature is the optimization that Jetpack provides for Mobile phones. Just enable this feature on the admin menu and browsing your blog through a Mobile device will be a pleasant experience.
• Revision Control will give the user more control over the Revision functionality. The plugin allows the user to set a site-global setting (Settings -> Revisions) for pages/posts to enable/disable/limit the number of revisions which are saved for the page/post.
• Speedy Page Redirection adds a meta box to your page and post screens, you can then enter a new destination URL to which the page will be redirected.
• Twenty Eleven Theme Extensions is an easy-to-use plugin designed for use with the latest default WordPress theme, Twenty Eleven. It adds a set of customizable features for the theme, designed to add more flexibility to the theme s design without having to modify the template files.

#access, #branding .only-search #s, .entry-header .comments-link  
display: none;
 

#branding  
border-top: none;
 

/*** Updates WordPress without FTP credentials. ***/
define('FS_METHOD','direct');

1. Machine A is our main virtualization machine and hosts several virtual machines. (VMs)
2. Each VM has its own VNC port assigned. (usually the port range goes from 5900 to 5910 or even more if the hosted VMs are more than 10)
3. We ll be using libvirt, thus virsh.

sudo virsh
virsh # list
Id   Name   Status
----------------------------------------------------
5    foo    running
6    bar    running
7    foobar running
virsh # vncdisplay foobar
:3

ssh -f -N -L 5910:localhost:5903 user@machine-A.com

1. -N tells SSH to not execute any command after logging in.
2. -f tells SSH to hide into the background just before the command gets executed.
3. -L enables the port forwarding between the local (client) host and the host on the remote side.

Protocol: VNC - Virtual Network Computing
Server: localhost - 127.0.0.1
Port: 5910

1. Machine A is our main virtualization machine and hosts several virtual machines. (VMs)
2. Each VM has its own VNC port assigned. (usually the port range goes from 5900 to 5910 or even more if the hosted VMs are more than 10)
3. We ll be using libvirt, thus virsh.

sudo virsh
virsh # list
Id   Name   Status
----------------------------------------------------
5    foo    running
6    bar    running
7    foobar running
virsh # vncdisplay foobar
:3

ssh -f -N -L 5910:localhost:5903 user@machine-A.com

1. -N tells SSH to not execute any command after logging in.
2. -f tells SSH to hide into the background just before the command gets executed.
3. -L enables the port forwarding between the local (client) host and the host on the remote side.

Protocol: VNC - Virtual Network Computing
Server: localhost - 127.0.0.1
Port: 5910

Deb-o-Matic is an easy to use build machine for Debian source packages based on pbuilder, written in Python. It provides a simple tool to automate build of source packages with limited user interaction and a simple configuration. It has some useful features such as automatic update of pbuilder, automatic scan and selection of source packages to build and modules support.

apt-get install debomatic

[default]
builder: pbuilder
packagedir: /home/john/debomatic # Take note of the following path since we'll need it for later use.
configdir: /etc/debomatic/distributions
pbuilderhooks: /usr/share/debomatic/pbuilderhooks
maxbuilds: 3 # The number of builds you can perform at the same time.
inotify: 1
sleep: 60 # The sleep time between one build and another.
logfile: /var/log/debomatic.log
[gpg]
gpg: 0 # Change to 1 if you want Deb-O-Matic to check the GPG signature of the uploaded packages.
keyring: /etc/debomatic/debomatic.gpg # Add the GPG Keys you want Deb-O-Matic to accept in this keyring.
[modules]
modules: 1 # A list of all the available modules will follow right after.
modulespath: /usr/share/debomatic/modules
[runtime]
alwaysupdate: unstable experimental precise
distblacklist:
modulesblacklist: Lintian Mailer
mapper:  'sid': 'unstable',
'wheezy': 'testing',
'squeeze': 'stable' 
[lintian]
lintopts: -i -I -E --pedantic # Run Lintian in Pedantic mode.
[mailer] # You need an SMTP server running on your machine for the mailer to work. You can have a look at the 'Ssmtp' daemon which is a one-minute-setup MTA, check an example over here.
fromaddr: debomatic@localhost
smtphost: localhost
smtpport: 25
authrequired: 0
smtpuser: user
smtppass: pass
success: /etc/debomatic/mailer/build_success.mail-template # Update the build success or failure mails as you wish by modifying the relevant files.
failure: /etc/debomatic/mailer/build_failure.mail-template
[internals]
configversion = 010a

1. Contents , which acts as a dpkg -c over the built packages.
2. DateStamp , which displays build start and finish times into a file in the build directory.
3. Lintian , which stores Lintian output on top of the built package in the pool directory.
4. Mailer , which sends a reply to the uploader once the build has finished.
5. PrevBuildCleaner , which deletes all files generated by the previous build.
6. Repository , which generates a local repository of built packages.

[debomatic]
method = local
incoming = /home/john/debomatic

[debomatic]
login = john
fqdn = debomatic.example.net
method = scp
incoming = /debomatic

<VirtualHost *:80>
ServerAdmin john@example.net
ServerName debomatic.example.net
DocumentRoot /home/john/debomatic
<Directory /home/john/debomatic>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
</Directory>
</VirtualHost>

sudo /etc/init.d/debomatic start

deb http://debomatic.example.net/ unstable main contrib non-free

- [ -x "$DAEMON" ]   exit 0
- [ "$DEBOMATIC_AUTOSTART" = 0 ] && exit 0
+ [ -x "$DAEMON" ]   exit 0
+ [ "$DEBOMATIC_AUTOSTART" = 1 ] && exit 0

update-rc.d debomatic defaults

1. You need multiple people to access the static content of your website and you also want to maintain all the history of changes together with all the Git s magic.
2. You think using an FTP server is not secure enough.
3. You think giving out SSH access or more permissions on the server to multiple users it s not what you want. (also using scp will overwrite the files directly with all its consequences)

cd /srv/www.domain.com/http && sudo git clone http://git.example.com/git/domain.git

apt-get install fishpolld or yum install fishpolld

#!/bin/bash
PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"
WEBSITEDIR="/srv/www.domain.com/http"
if [ -d "$ WEBSITEDIR " ]; then
cd "$ WEBSITEDIR "
else
echo "Unable to access theme directory. Failing."
exit 1
fi
git pull

[fishpoll]
on_start = True

-A INPUT -m state --state NEW -m tcp -p tcp -s server-B-IP --dport 27527 -j ACCEPT

sudo /etc/init.d/fishpolld start or sudo systemctl start fishpolld.service or sudo /usr/sbin/fishpolld -D

apt-get install fishpoke or yum install fishpoke

#!/bin/sh
echo "Triggering update of configuration on server A"
fishpoke server-A-IP-or-DNS website_update

apt-get install supybot or yum install supybot
mkdir /home/$user/nagbot && cd /home/$user/nagbot
supybot-wizard (follow the directions to get the bot initially configured)

git clone git://git.fedorahosted.org/supybot-notify.git && cd supybot-notify
mkdir -p /home/$user/nagbot/plugins/notify && cp -r * /home/$user/nagbot/plugins/notify

# 'notify-by-ircbot' command definition
define command 
    command_name    notify-by-ircbot
    command_line    /usr/bin/printf "%b" "#channel $NOTIFICATIONTYPE$ - $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$: $SERVICEOUTPUT$ ($$(hostname -s))"   nc -w 1 localhost 5050
     
# 'host-notify-by-ircbot' command definition
define command 
	command_name	host-notify-by-ircbot
	command_line	/usr/bin/printf "%b" "#channel $NOTIFICATIONTYPE$ - $HOSTALIAS$ is $HOSTSTATE$: $HOSTOUTPUT$ ($$(hostname -s))"   nc -w 1 localhost 5050
	 

-A INPUT -m state --state NEW,ESTABLISHED -m tcp -p tcp --dport 5050 -j ACCEPT

define contact 
 	contact_name    nagbot
   	use             generic-contact
        alias		Nagios IRC Bot
        email           example@example.com
        service_notification_commands   notify-by-ircbot
 	host_notification_commands      host-notify-by-ircbot
 

sudo /etc/init.d/nagios3 reload

 PROBLEM - $hostalias/load average is CRITICAL: CRITICAL - load average: 30.45, 16.24, 7.16 (nagioshost)
 RECOVERY - $hostalias/load average is OK: OK - load average: 0.06, 0.60, 3.65 (nagioshost)

#!/usr/bin/python -tt
import warnings
warnings.simplefilter("ignore")
import xmpp
from xmpp.protocol import Message
from optparse import OptionParser
import ConfigParser
import sys
import os
parser = OptionParser()
opts, args = parser.parse_args()
if len(args) < 1:
    print "xmppsend message [to whom, multiple args]"
    sys.exit(1)
msg = args[0]
msg = msg.replace('\\n', '\n')
# Connect to the server
c  =  xmpp.Client('gmail.com')
c.connect( ( 'talk.google.com', 5223 ) )
# Authenticate to the server
jid  =  xmpp.protocol.JID( 'example@gmail.com' )
c.auth( jid.getNode( ), 'yourgmailpassword' )
if len(args) < 2:
    r = c.getRoster()
    for user in r.keys():
        if user == username:
            continue
        c.send(Message(user, '%s' % msg))
else:
    for user in args[1:]:
        c.send(Message(user, '%s' % msg))

define command 
        command_name    host-notify-by-xmpp
        command_line    /home/user/bin/xmppsend "Host '$HOSTALIAS$' is $HOSTSTATE$ - Info : $HOSTOUTPUT$" $CONTACTPAGER$
         
define command 
        command_name    notify-by-xmpp
        command_line    /home/user/bin/xmppsend "$NOTIFICATIONTYPE$ $HOSTNAME$ $SERVICEDESC$ $SERVICESTATE$ $SERVICEOUTPUT$ $LONGDATETIME$" $CONTACTPAGER$
         

define contact  
        contact_name    admin
        use             generic-contact
        alias           Full Name
        email           example@gmail.com
        pager           example@gmail.com
        service_notification_commands   notify-by-xmpp
        host_notification_commands      host-notify-by-xmpp
 

sudo /etc/init.d/nagios3 reload

[xmpp_nagios]
username=example@gmail.com
password=yourgmailpassword

xmppsend -a config.ini