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In the above configuration, we configured HTTP caching, which relies on HTTP headers. However, none of the content we’re serving actually has the Expires or Cache-Control headers needed to make intelligent caching decisions. To set these headers, we need to take advantage of a few more modules.

The mod_expires module can set both the Expires header and the max-age option in the Cache-Control header. The mod_headers module can be used to add more specific Cache-Control options to tune the caching policy further. Both of these modules are enabled by default in the CentOS 7 Apache package.

We can go straight to modifying our virtual host file again to begin configuring these items:

• sudo nano /etc/httpd/conf.d/site.conf

The mod_expires module provides just three directives. The ExpiresActive turns expiration processing on in a certain context by setting it to “on”. The other two directives are very similar to each other. TheExpiresDefault directive sets the default expiration time, and the ExpiresByType sets the expiration time according to the MIME type of the content. Both of these will set the Expires and the Cache-Control “max-age” to the correct values.

These two settings can take two different syntaxes. The first is simply “A” or “M” followed by a number of seconds. This sets the expiration in relation to the last time the content was “accessed” or “modified” respectively. For example, these both would expire content 30 seconds after it was accessed.

ExpiresDefault A30
ExpireByType text/html A30

The other syntax allows for more verbose configuration. It allows you to use units other than seconds that are easier for humans to calculate. It also uses the full word “access” or “modification”. The entire expiration configuration should be kept in quotes, like this:

ExpiresDefault "modification plus 2 weeks 3 days 1 hour"
ExpiresByType text/html "modification plus 2 weeks 3 days 1 hour"

For our purposes, we’ll just set a default expiration. We will start by setting it to 5 minutes so that if we make a mistake while getting familiar, it won’t be stored on our clients’ computers for an extremely long time. When we’re more confident in our ability to select policies appropriate for our content, we can adjust this to something more aggressive:

<VirtualHost *:80>
    ServerName server_domain_or_IP
    DocumentRoot /var/www/html

    CacheQuickHandler off

    CacheLock on
    CacheLockPath /tmp/mod_cache-lock
    CacheLockMaxAge 5

    CacheIgnoreHeaders Set-Cookie

    <Location />
        CacheEnable disk
        CacheHeader on

        CacheDefaultExpire 600
        CacheMaxExpire 86400
        CacheLastModifiedFactor 0.5

        ExpiresActive on
        ExpiresDefault "access plus 5 minutes"
    </Location>
</VirtualHost>

This will set our Expires header to five minutes in the future and set Cache-Control max-age=300. In order to refine our caching policy further, we can use the Header directive. We can use the merge option to add additional Cache-Control options. You can call this multiple times and add whichever additional policies you’d like. Check out this guide to get an idea about the caching policies you’d like to set for your content. For our example, we’ll just set “public” so that other caches can be sure that they’re allowed to store copies.

To set ETags for static content on our site (to use for validation), we can use the FileETag directive. This will work for static content. For dynamically generated content, you’re application will be responsible for correctly generating ETags.

We can use the directive to set the attributes that Apache will use to calculate the Etag. This can beINode, MTime, Size, or All depending on if we want to modify the ETag whenever the file’s inodechanges, its modification time changes, its size changes, or all of the above. You can provide more than one value, and you can modify the inherited setting in child contexts by preceding the new settings with a+ or -. For our purposes, we’ll just use “all” so that all changes are registered:

<VirtualHost *:80>
    ServerName server_domain_or_IP
    DocumentRoot /var/www/html

    CacheQuickHandler off

    CacheLock on
    CacheLockPath /tmp/mod_cache-lock
    CacheLockMaxAge 5

    CacheIgnoreHeaders Set-Cookie

    <Location />
        CacheEnable disk
        CacheHeader on

        CacheDefaultExpire 600
        CacheMaxExpire 86400
        CacheLastModifiedFactor 0.5

        ExpiresActive on
        ExpiresDefault "access plus 5 minutes"

        Header merge Cache-Control public
        FileETag All
    </Location>
</VirtualHost>

This will add “public” (separated by a comma) to whatever value Cache-Control already has and will include an ETag for our static content.

When you are finished, save and close the file. Check the syntax of your changes by typing:

• sudo apachectl configtest

If no errors were found, restart your service to implement your caching policies:

• sudo systemctl restart httpd

Conclusion

Configuring caching with Apache can seem like a daunting job due to how many options there are. Luckily, it is easy to start simple and then grow as you require more complexity. Most administrators will not require each of the caching types.

When configuring caching, keep in mind the specific problems that you’re trying to solve to avoid getting lost in the different implementation choices. Most users will benefit from at least setting up headers. If you are proxying or generating content, setting an HTTP cache may be helpful. Shared object caching is useful for specific tasks like storing SSL sessions or authentication details if you are using a backend provider. File caching can probably be limited to those with slow systems.

With the above bugs and caveats in mind, if you still wish to configure this type of caching in Apache, follow along below.

The method used to set up the key-value cache will depend on what it will be used for and what provider you are using. We’ll go over the basics of both authentication caching and SSL session caching below.

Currently, there is a bug with authentication caching that prevents passing arguments to the cache provider. So any providers that do not provide default settings to fall back on will have issues.

Authentication Caching

Authentication caching is useful if you are using an expensive authentication method, such as LDAP or database authentication. These types of operations can have a significant impact on performance if the backend must be hit every time an authentication request is made.

Setting up caching involves modifying your existing authentication configuration (we will not cover how to set up authentication in this guide). The modifications themselves will be much the same regardless of the backend authentication method. We’ll use mod_socache_shmcb for our demonstration. This module is already enabled in our /etc/httpd/conf.modules.d/00-base.conf file.

Open your main Apache configuration file so that you can specify this shared cache backend for use with authentication:

• sudo nano /etc/httpd/conf/httpd.conf

Inside, towards the top of the file, add the AuthnCacheSOCache directive. Specify that shmcb should be used as the provider. If the bug discussed earlier preventing option passing is fixed by the time you read this, you can specify a location and size for the cache. The number is in bytes, so the commented example will result in a 512 kilobyte cache:

AuthnCacheSOCache shmcb

# If the bug preventing passed arguments to the provider gets fixed,
# you can customize the location and size like this
#AuthnCacheSOCache shmcb:${APACHE_RUN_DIR}/auth_cache(512000)

Save and close the file when you are finished.

Next, open your virtual host configuration page that has authentication configured. We’ll assume you’re using a virtual host config called site.conf located within the /etc/httpd/conf.d directory, but you should modify it to reflect your environment:

• sudo nano /etc/httpd/conf.d/site.conf

A basic virtual host set up with authentication may look something like this:

<VirtualHost *:80>
    ServerName server_domain_or_IP
    DocumentRoot /var/www/html

    <Directory /var/www/html/private>
        AuthType Basic
        AuthName "Restricted Files"
        AuthUserFile /etc/httpd/.htpasswd
        AuthBasicProvider file
        Require valid-user
    </Directory>
</VirtualHost>

In the location where you’ve configured authentication, modify the block to add caching. Specifically, you need to add the AuthnCacheProvideFor to tell it which authentication sources to cache, add a cache timeout with AuthnCacheTimeout, and add socache to the AuthBasicProvider list ahead of your conventional authentication method. The results will look something like this:

<VirtualHost *:80>
    ServerName server_domain_or_IP
    DocumentRoot /var/www/html

    <Directory /var/www/html/private>
        AuthType Basic
        AuthName "Restricted Files"
        AuthUserFile /etc/apache/.htpasswd
        AuthBasicProvider socache file
        AuthnCacheProvideFor file
        AuthnCacheTimeout 300
        Require valid-user
    </Directory>
</VirtualHost>

The above example is for file authentication, which probably won’t benefit from caching very much. However, the implmentation should be very similar when using other authentiation methods. The only substantial difference would be where the “file” specification is in the above example, the other authentication method would be used instead.

Save and close the file. Check your changes for syntax errors by typing:

• sudo apachectl configtest

If no syntax errors are found, restart Apache to implement your caching changes:

• sudo systemctl restart httpd

SSL Session Caching

The handshake that must be performed to establish an SSL connection carries significant overhead. As such, caching the session data to avoid this initialization step for further requests can potentially skirt this penalty. The shared object cache is a perfect place for this.

If you have SSL already configured for your Apache server, mod_ssl will be enabled (if not, use yum to install the mod_ssl module). On CentOS 7, this means that an ssl.conf file will be available in the/etc/httpd/conf.d directory. This actually already sets up caching. Inside, you will see some lines like this:

. . .

SSLSessionCache         shmcb:/run/httpd/sslcache(512000)
SSLSessionCacheTimeout  300

. . .

This is actually enough to set up session caching. To test this, you can use OpenSSL’s connection client. Type:

• openssl s_client -connect 127.0.0.1:443 -reconnect -no_ticket | grep Session-ID

If the session ID is the same in all of the results, your session cache is working correctly. Press CTRL-C to exit back to the terminal.

Caching is a method of improving server performance by allowing commonly requested content to be temporarily stored in a way that allows for faster access. This speeds up processing and delivery by cutting out some resource intensive operations.

By creating effective caching rules, content that is suitable for caching will be stored to improve response times, conserve resources, and minimize load. Apache provides a variety of caches suitable for speeding up different types of operations. In this guide, we will be discussing how to configure Apache 2.4 on CentOS 7 using its various caching modules.

To learn more about developing general caching strategies, check out this article.

An Introduction to Caching in Apache

Apache can cache content with varying levels of sophistication and scalability. The project divides these into three groups according to the method in which the content is cached. The general breakdown is:

• File Caching: The most basic caching strategy, this simply opens files or file descriptors when the server starts and keeps them available to speed up access.
• Key-Value Caching: Mainly used for SSL and authentication caching, key-value caching uses a shared object model that can store items which are costly to compute repeatedly.
• Standard HTTP caching: The most flexible and generally useful caching mechanism, this three-state system can store responses and validate them when they expire. This can be configured for performance or flexibility depending on your specific needs.

A quick look at the above descriptions may reveal that the above methods have some overlap, but also that it may be helpful to use more than one strategy at the same time. For instance, using a key-value store for your SSL sessions and enabling a standard HTTP cache for responses could allow you to take significant load off of your data sources and speed up many content delivery operations for your clients.

Now that you have a broad understanding of each of Apache’s caching mechanisms, let’s look at these systems in more detail.

File Caching

General Overview

• Primary modules involved: mod_file_cache
• Main use cases: storing either file contents or file descriptors when the server starts. These are static representations that cannot reliably be changed until the server is restarted.
• Features: simple, improves performance of slow filesystems
• Drawbacks: experimental feature, does not respond to updates on the filesystem, must be used sparingly to fit within operating system’s limitations, can only be used on static files

The Details

The mod_file_cache module is mainly used to speed up file access on servers with slow filesystems. It provides a choice of two configuration directives, both of which aim to accelerate the process of serving static files by performing some of the work when the server is started rather than when the files are requested.

The CacheFile directive is used to specify the path to files on disk that you would like to accelerate access to. When Apache is started, Apache will open the static files that were specified and cache the file handle, avoiding the need to open the file when it is requested. The number of files that can be opened in this way is subject to the limitations set by your operating system.

The MMapFile directive also opens files when Apache is first started. However, MMapFile caches the file’s contents in memory rather than just the file handler. This allows for faster performance for those pages, but it has some serious limitations. It maintains no record of the amount of memory it has used, so it is possible to run out of memory. Also note that child processes will copy any of the allocated memory, which can result in faster resource depletion than you initially may anticipate. Only use this directive sparingly.

These directives are evaluated only when Apache starts. This means that you cannot rely on Apache to pick up changes made after it has started. Only use these on static files that will not change for the lifetime of the Apache session. Depending on how the files are modified, the server may be notified of changes, but this is not expected behavior and will not always work correctly. If changes must be made to files passed to these directives, restart Apache after the changes have been made.

How To Enable File Caching

File caching is provided by the mod_file_cache module. To use this functionality, you’ll need to enable the module.

When running CentOS 7, the module will be installed when you install Apache, but the default configuration does not load the module. To load the module, we’ll create a simple file in our/etc/httpd/conf.modules.d directory to load the module. We’ll call this file 00-cache.conf:

• sudo nano /etc/httpd/conf.modules.d/00-cache.conf

Inside, we need to use the LoadModule directive to enable the functionality we need. Add the following line to the file:

LoadModule file_cache_module modules/mod_file_cache.so

Save and close the file when you’re finished.

Afterwards, you should edit the main configuration file to set up your file caching directives. Open the file by typing:

• sudo nano /etc/httpd/conf/httpd.conf

To set up file handle caching, use the CacheFile directive. This directive takes a list of file paths, separated by spaces, like this:

CacheFile /var/www/html/index.html /var/www/html/somefile.index

When the server is restarted, Apache will open the files listed and store their file handles in the cache for faster access.

If, instead, you wish to map a few files directly into memory, you can use the MMapFile directive. Its syntax is basically the same as the last directive, in that it simply takes a list of file paths:

MMapFile /var/www/html/index.html /var/www/html/somefile.index

In practice, there would be no reason to configure both CacheFile and MMapFile for the same set of files, but you could use both on different sets of files.

When you are finished, you can save and close the files. Check the configuration file syntax by typing:

• sudo apachectl configtest

If the last line reads Syntax OK, you can safely restart your Apache instance:

• sudo systemctl restart httpd

Apache will restart, caching the file contents or handlers depending on the directives you used.

Key-Value Caching

General Overview

• Primary modules involved: mod_socache_dbm, mod_socache_dc, mod_socache_memcache,mod_socache_shmcb
• Supporting modules involved: mod_authn_socache, mod_ssl
• Main use cases: storing SSL sessions or authentication details, SSL stapling
• Features: shared object cache to store complex resources, can assist in SSL session caching and stapling, flexible backends
• Drawbacks: has no validation mechanisms, need to configure separate software for more performant/flexible backends, some bugs in code

The Details

Key-value caching is more complex than file caching and has more focused benefits. Also known as a shared object cache, Apache’s key-value cache is mainly used to avoid repeating expensive operations involved with setting up a client’s access to content, as opposed to the content itself. Specifically, it can be used to cache authentication details, SSL sessions, and to provide SSL stapling.

Currently, there are some issues with every shared object cache provider. References to the issues will be outlined below. Take these into consideration when evaluating whether to enable this feature.

The actual caching is accomplished through the use of one of the shared object caching provider modules. These are:

• mod_socache_dbm: This backend uses the simple dbm database engine, which is a file-based key-value store that makes use of hashing and fixed-size buckets. This provider suffers from some memory leaks, so for most cases it is recommended to use mod_socache_shmcb instead.
• mod_socache_dc: This provider uses the distcache session caching software. This project has not been updated since 2004 and is not even packaged for some distributions, so use with a healthy dose of caution.
• mod_socache_memcache: This uses the memcache distributed memory object cache for storing items. This is the best option for a distributed cache among multiple servers. Currently, it does not properly expire entries, but a patch was committed to the trunk of Apache’s version control that fixes the issue.
• mod_socache_shmcb: Currently, this is the best option for key-value caching. This caches to a cyclic buffer in shared memory, which will remove entries as it becomes full. It currently chokes onentries over 11k in size.

Along with the above provider modules, additional modules will be required depending on the objects being cached. For instance, to cache SSL sessions or to configure SSL stapling, mod_ssl must be enabled, which will provide the SSLSessionCache and SSLStaplingCache directives respectively. Similarly, to set up authentication caching, the mod_authn_socache module must be enabled so that theAuthnCacheSOCache directive can be set.

If you’ve got a spare low end server, you could consider implementing Mumble to facilitate voice chats with those that you invite to connect to your server. There’s several reason you may want to implement the Mumble Server app. Perhaps you’d like to privately communicate with a loved one without paying fees to a telephony provider?

Examining the Core Features of Mumble

If you decide to install Mumble on your VPS, you can expect to get the following:

• Low-latency: This makes Mumble great for talking and gaming
•  Encrypted communications – Mumble uses Public/private-key authentication by default
•  Recognize your friends across different servers
•  In-game Overlay / See which user is talking
•  Positional Audio – Hear the players from where they are located
•  Wizards to guide you through the setup (ex. configuring your microphone)

We will now go through the installation looking both at the server side and at the client side.

How to Install the Mumble Server

Mumble is available in the software repositories of each of the major Linux distributions. This makes Mumble very easy to install and setup. We will concentrate on how to install the server on a Ubuntu VPS.
First step consists in connecting to the server from your client using SSH:

ssh username@SERVER-IP

You will be asked for the password and then you will be logged in. Once inside the server you will need to gain root access:

sudo bash

Type in your root password and then run the following command to install the mumble server:

apt-get install mumble-server

Once the server is installed you will need to setup Mumble running the following command:

dpkg-reconfigure mumble-server

You will be now asked if you want the mumble-server to be started automatically when the servers start. Pick “Yes”.
The following questions will pop-up, asking if you wish to run Mumble in a high- priority mode to ensure lower latency. It’s a good idea to run it in this mode so pick “Yes”.

You will now have to choose a password for the administrative user of your new Mumble server. This password will be needed later to log-in so you better take note of it.

Congratulations! We have now finished installing the server-side of the Mumble app.

How To Install the Mumble Client on Ubuntu

Let’s move on to the client. The client can be installed on all the major platforms (Windows, Mac OS X and Linux). We will go through the installation and configuration on Ubuntu Linux.

Once again you will need to open a terminal and type the following command in order to gain root access:

sudo bash

You will be asked for your root password of your workstation and after that your prompt will be ready for the next command that actually installs the mumble client:

apt-get install mumble

Once the installation process is done, you can exit the root mode using the following command:

exit

You will now be ready to start Mumble using the following command:

mumble

Since it will be the first time you run that program, it will present you with a wizard to help you configure your audio input and output.
It will give you a short introduction where you will have to press “Next” to reach the sound device selection window.
It will first ask you which sound device and microphone to use.

Once you will have selected the right input and output devices pressing “Next”, you will reach the window where you will be able to calibrate the devices and set the right level for each of them. After you’ve finished the audio setup process, you will be asked to create a certificate since Mumble will encrypt all the communications.
Leave the “Automatic Certificate Creation” option selected and press “Next”.

Press “Finish” in the next window, you’ll be on your way to finishing up the installation.

Final Step: Test Out Your Mumble Server

The last step is to select which server you want to connect to. You can choose one from the list or press the “Add New…” button on the low part of the window.

In this case we will press “Add New…” because we will want to connect to our own server.

First enter a label to help you identifying your server, next add the address and port of the server and finally use “SuperUser” as user and the password you chose when you configured the Mumble server.

Congratulations!

You will now be able connect to the server and enjoy all of the features while you play online or talk to your friends.

(Tutorial written by a contributor)

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Here’s how to install mr-kloxo for CentOS 5, CentOS 6:

A. pre-install -- better for fresh install

    cd /

    # update centos to latest version
    yum update -y
    # install some packages like package-cleanup, etc
    yum install yum-utils yum-priorities vim-minimal subversion curl zip unzip -y
    yum install telnet wget -y

    cd /

B. Install Kloxo-MR
   - Install/reinstall/upgrade -- data not destroyed with this fork
     for existing Kloxo (6.1.x), run 'sh /script/update' first.

B.1. Fresh Install

    B.1.1. for version 6.5.0 (rpm naming as kloxomr-6.5.0-*.rpm)

        # move to /
        cd /tmp

        # remove old rpm
        rm -f mratwork*

        # get repo file -- no need for 6.5.0.c and after
        wget https://github.com/mustafaramadhan/kloxo/raw/rpms/release/neutral/noarch/mratwork-release-0.0.1-1.noarch.rpm --no-check-certificate
        rpm -ivh mratwork-release-0.0.1-1.noarch.rpm

        # move to /
        cd /

        # update
        yum clean all

        yum update mratwork-* -y

        yum install kloxomr -y

        sh /script/upcp
  
    B.1.2. for version 7.0.0 (rpm naming as kloxomr7-7.0.0-*.rpm)

        # move to /
        cd /tmp

        # remove old rpm
        rm -f mratwork*

        # get repo file -- no need for 6.5.0.c and after
        wget https://github.com/mustafaramadhan/kloxo/raw/rpms/release/neutral/noarch/mratwork-release-0.0.1-1.noarch.rpm --no-check-certificate
        rpm -ivh mratwork-release-0.0.1-1.noarch.rpm

        # move to /
        cd /

        # update
        yum clean all

        yum update mratwork-* -y

        yum install kloxomr7 -y

        sh /script/upcp

B.2. update from 6.5.0 to 7.0.0

    yum replace kloxomr --replace-with=kloxomr7 -y
	
    # '-y' mean force
    sh /script/upcp -y
	
B.3. update from Kloxo Official 6.1.19

    ## follow step B.1.1 or B.1.2 and read 'WARNING' below before next step

    # '-y' mean force
    sh /script/upcp -y

WARNING:

1. Need running 'sh /script/backup-patch' in Kloxo Official (6.1.12) before backup data.

    - In Kloxo offical run:

        cd /script
        wget https://github.com/mustafaramadhan/kloxo/raw/dev/kloxo/pscript/backup-patch
        sh ./backup-patch

2. Need remove certain rpms in Kloxo Official after 6.1.12 (testing in 6.1.19)

	# remove packages from Kloxo Official
    yum remove kloxo* -y
    
3. Since 6.5.0.f-20130701, Kloxo-MR using MySQLi API instead MySQL API. Need update mysql 5.0.x to 5.1.x or above for Centos 5.

    - Check mysql version with:

        mysql -V|awk '{print $5}'

    - Update with 'yum replace mysql --replace-with=mysql55' (ask to forum for update to MariaDB)

4. Make sure all MySQL databases in MyISAM storage-engine (especially upgrade to version 6.5.0) with execute:

   ## convert to MyISAM storage-engine
   sh /script/mysql-convert --engine=myisam

Server virtualization is implemented in a way from a single physical machine can create multiple independent virtual machines. Each virtual machine has a system set up separate sources, its own operating system and applications separately. There are two forms of server virtualization.

Virtualization Management Layer: This is the original form of virtualization of servers. We are often called “hosted”. As the figure below shows, virtualization functionality is built on a common platform OS. Some common products: Microsoft’s Virtual PC, Workstation and VMWare’s.
Dedicated Virtualization: Virtualization mode often called “bare-metal”, which is run directly on the server hardware. So you will use server resources than is optimal form of “hosted” faster processing speed. The popular products: Vsphere (ESX), Xen, and Hyper-V…

Disadvantage of traditional solutions
To meet these requirements are constantly on the implementation and development of new services and applications, organizations need to continue to increase the number of servers. However, as more and more servers, the problem is even clearer:

Increased costs: more purchasing new servers will include the cost of purchasing servers and other costs: power, cooling, space in the server room, …

Low investment efficiency: with each one dedicated server for x86 applications (low load) operations will yield only about 5-15% of CPU.

Reduce management capabilities: management more difficult as more and more servers and applications in a complex environment with a variety of operating systems, hardware, different types of servers.

The effectiveness of the reduction: IT staff will focus more time for server deployment, configuration, monitoring and maintenance. So no longer focus on the activities and projects to help improve the level of information infrastructure.

Benefits of virtualization solutions cannon
Virtualization solution to solve the problem of cost and performance of the server operating costs by reducing hardware and operating more than 50%, the optimal use of resources through virtualization. It also helps deploy servers quickly, easily and automatically manage the resources in a more optimal server as:

– Simplify infrastructure management by centralized management.

– Automate the management of server resources to help IT staff no longer spend so much time on the management server that will focus on new applications and services to benefit the people users and organizations.

– Up to 50% of the cost of new equipment devices such as servers, power, cooling system … by increasing the operational efficiency of the current server.

High Availability & Disaster Prevention
IT is increasingly important contribution to operations of businesses and organizations. The IT system stops working for whatever reason: maintenance, backup, equipment failure, natural disaster will affect very large businesses and organizations. Virtualization solutions will help protect data effectively, can recover lost data quickly and easily; providing fault tolerance, ensuring applications and services continues to operate if something goes wrong; while allowing the system to restore effective IT disaster with lower costs such as:

Protect your data safe
Virtualization solutions ensure the backup, restore data, applications and services quickly, easily and flexibly to meet the requirements of time and data recovery needs such as:

– Data Recovery Fast and simple

– Simplify data protection in a comprehensive

– Enables centralized backup virtual machines without affecting users, applications

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– Solution complex and take time to recover: need many tools, recovery process for each type of application, each type of data. At the same time the recovery process is consuming too much time, can not meet the requirements of the RTO (recovery time objective).

– Ability to restore unreliable: Need to regularly inspect and evaluate the solution to ensure the ability to recover when the problem. However, the current solution is hard to test because of the complexity and time for recovery.
Virtualization solutions provide a DR plan with a completely new approach – based on the concept of virtualization – to bring the advantages compared to existing solutions:

– Recovery Actions: Virtualization makes it easy to copy, clone the system resources should be time for the lake is improved significantly.

– Solution recovery after a disaster is always ready and achieves high reliability for easy inspection and evaluation more.

– Reduce the cost of building a solution Disaster

Recovery using the virtual machine is hardware independent and can run on any x86 physical servers typically without editing, reconfiguration, so can use any server in the DR site that is not required to purchase hardware like in production site.

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Smart Devices – New Generation
The concept of “wearable computing” is increasingly popular with smart devices more compact that you can wear as jewelry. Imagine a pair of contact lenses can help you weather or update Facebook. Closer to home, a pair of 3D glasses, clocks and personal devices have been and will change the way you approach the world around them. This will be a potential market is no less present in the smartphone market.

Production of beer and alcoholic beverages
Forget the spirits go! The craft brewing and manufacturing base retail alcoholic beverage is to make food. The traditional formula, the meticulous and exquisite artisan have high quality drinks and formed a popular trend in the US. Sales of individual manufacturers in the US rose 29% in 2012 and with the winemakers, the rate is 32%. With the huge amount of beer consumed in Vietnam every year, you can be confident that you’re not missing the opportunity to get rich.

Tourist boats
Travel by train has always been a symbol of expensive and spiritual discovery. However, the demand for this industry is growing and the demands of increasing customer. Not only segment of luxury cruise ship that river travel or romantic ride in the bay, lake with exceptional service.