When you start the loadbalancer.org appliance you will see the following:

Default login:
Username: root
Password: loadbalancer

Access to webclient from an external client is:
http://192.168.1.129:9080
http://192.168.1.129:9443

You can access the web administrator using the IP and ports described onscreen.

For the sri lanka porject we are looking for performance and the network diagram indicates we are happy to have the cluster on the same subnet as the rest of the network.

Direct routing is the fasted performance possible, it has the advantage over NAT that the Loadbalancer does not become a bottleneck for incoming and outgoing packets. With DR the loadbalancer simply examines incoming packets and the servers to route the packets directly back to the requesting user.

The web interfaceis the only way to fully configure the loadbalancer vm. The console tool lbwizard will get it initiallised and any further configurations can then be done via the webinterface.

Using lbwizard for the Sri lanka configuration follow these steps.

On the first Loadbalancer:

//Start

Is this unit part for a HA Pair?
YES

Have you already setup the Slave?
NO

Is this a one-armed configuration?
YES

Enter the IP Address for the interface eth0?
Enter IP address you wish to be assigned to the SLAVE loadbalancer.

Enter the netmask for interface eth0?
Enter netmask for the subnet.

Enter the Floating IP adrress?
Enter the IP address that will be IP assosiacted the the HA-pair of loadbalancers.

//Finish

On the 2nd loadbalancer VM, run the lbwizard.

//Start

Is this unit part of an HA-Pair?
YES

Have you already set up the Slave?
YES

What is the slave units UP address?
Enter the IP which you entered when configuring the other loadbalancer VM.

Is this a one-armed configuration?
YES

Enter the IP Address for the interface eth0?
Enter the IP that will be assigned to the MASTER loadbalancer

Enter the netmask for interface eth0?
Enter the subnet netmask.

Enter the Floating IP address?
Enter the IP address that will be IP assosiacted the the HA-pair of loadbalancers.

Enter the address of the default gateway?
Enter the deafult gateway for the subnet.

Enter the IP of the nameserver?
Enter the dns server.

Enter the port for the first Virtual server?
Enter 22 for ssh

Enter the IP address of the first real server?
Enter the real IP of the first appserver

//Finish

Now this is complete we need to go to the web admin interface to configure the 2nd Real Server. As the lbwizard program will only allow you to configure 1 real server.

Now login to the web admin using the default password:

username: loadbalancer
password: loadbalancer

Note: Connect to the IP you have now set for your master loadbalancer

Goto the edit configuration tab

Now click add a real server:

Enter a label
IP address of the server plus the port of the service i.e. 192.168.1.125:22


Edit Configuration -> Virtual Servers

persistancte -> NO

Scheduler-> LC
LC - Least-Connection: assign more jobs to real servers with
fewer active jobs.

Service to check -> custom1

Check port -> 22

Forwarding Method -> DR

Feedback Method -> Agent

Arp Problem when using DR

Every real server must be configured to respond to the VIP address as well as the RIP
address.

You can use iptables (netfilter) on the real server to re-direct incoming packets destined for the virtual
server IP address.

This is a simple case of adding the following command to your start up script (rc.local):

//replace 10.0.0.21 with the Virtual Server IP
iptables -t nat -A PREROUTING -p tcp -d 10.0.0.21 -j REDIRECT

chkconfig iptables on

• Warnings
• Headers
• Icon set 1
• Icon set 2
• Icon set 3
• Tooltips
• Highlights
• Code
• Unordered lists
• Ordered lists
• Abbrs and acronyms
• Definition lists
• Legends
• Dropcaps
• Floated blocks
• Other span blocks
• Blockquotes
• Tables

Warnings

This is a sample info message. Use <p class="gkInfo1">Your info message goes here!</p>.

This is a sample tips message. Use <p class="gkTips1">Your tips goes here!</p>.

This is a sample warning message. Use <p class="gkWarning1">Your warning message goes here!</p>.

This is a sample info message. Use <p class="gkInfo2">Your info message goes here!</p>.

This is a sample tips message. Use <p class="gkTips2">Your tips goes here!</p>.

This is a sample warning message. Use <p class="gkWarning2">Your warning message goes here!</p>.

This is a sample info message. Use <p class="gkInfo3">Your info message goes here!</p>.

This is a sample tips message. Use <p class="gkTips3">Your tips goes here!</p>.

This is a sample warning message. Use <p class="gkWarning3">Your warning message goes here!</p>.

This is a sample info message. Use <p class="gkInfo4">Your info message goes here!</p>.

This is a sample tips message. Use <p class="gkTips4">Your tips goes here!</p>.

This is a sample warning message. Use <p class="gkWarning4">Your warning message goes here!</p>.

This is a sample info message. Use <p class="gkInfo5">Your info message goes here!</p>.

This is a sample tips message. Use <p class="gkTips5">Your tips goes here!</p>.

This is a sample warning message. Use <p class="gkWarning5">Your warning message goes here!</p>.

Headers

This is heading 1

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper egestas nunc in volutpat. Fusce adipiscing velit ac eros tempor iaculis. Phasellus venenatis mollis augue, non posuere odio placerat in. Etiam volutpat ultrices lectus. Fusce eu felis erat. Donec congue interdum elit, sed ornare magna convallis lacinia. In hac habitasse platea dictumst. Mauris volutpat consectetur accumsan.

This is heading 2

Cras diam justo, sodales quis lobortis sed, lobortis vel mauris. Sed a mollis nunc. Quisque semper condimentum lectus, eget laoreet ipsum auctor et. Quisque sagittis luctus augue, id fringilla enim euismod quis. Nullam blandit, elit at euismod rutrum, tortor nibh posuere mauris, in volutpat diam ante ac dui. Sed velit massa, imperdiet placerat tristique et, consectetur a lorem. Praesent aliquet turpis in quam tempor eu pulvinar nibh luctus.

This is heading 3

Vivamus rhoncus arcu sit amet est tristique convallis nec vel eros. Vestibulum euismod luctus velit quis porta. Aliquam varius placerat mauris sed vehicula. Integer porta facilisis sapien, in tempus lorem mattis molestie. Suspendisse potenti. Praesent quis diam non dolor convallis mattis eu id nulla.

This is heading 4

Proin urna erat, egestas vel consectetur at, accumsan at purus. Donec est risus, facilisis dignissim placerat nec, euismod lacinia nisi. Nam ac sem sed quam sollicitudin condimentum et eu neque. Nunc enim urna, ultricies ac mollis pretium, imperdiet hendrerit massa. Sed eleifend felis sed tellus cursus lacinia. Aenean venenatis aliquet euismod. Nam quis turpis tellus, vitae malesuada neque.

This is a headline.

This is a subheadline.

Use <p class="gkHeadling">for headline</p>.Use <p class="gkSubHeadline">for subheadline</p>.Proin urna erat, egestas vel consectetur at, accumsan at purus. Donec est risus, facilisis dignissim placerat nec, euismod lacinia nisi. Nam ac sem sed quam sollicitudin condimentum et eu neque. Nunc enim urna, ultricies ac mollis pretium, imperdiet hendrerit massa. Sed eleifend felis sed tellus cursus lacinia. Aenean venenatis aliquet euismod. Nam quis turpis tellus, vitae malesuada neque.

This is a small headline

This is a large headline

Use <p class="gkHeadling">for headline</p>.Use <p class="gkSubHeadline">for subheadline</p>.Proin urna erat, egestas vel consectetur at, accumsan at purus. Donec est risus, facilisis dignissim placerat nec, euismod lacinia nisi. Nam ac sem sed quam sollicitudin condimentum et eu neque. Nunc enim urna, ultricies ac mollis pretium, imperdiet hendrerit massa. Sed eleifend felis sed tellus cursus lacinia. Aenean venenatis aliquet euismod. Nam quis turpis tellus, vitae malesuada neque.

Icon set 1

This is a sample audio message. Use <p class="gkAudio">Your audio message goes here!</p>.

This is a sample webcam message. Use <p class="gkWebcam">Your webcam goes here!</p>.

This is a sample email message. Use <p class="gkEmail">Your email message goes here!</p>.

This is a sample creditcard message. Use <p class="gkCreditcard">Your creditcart message goes here!</p>.

This is a sample feed message. Use <p class="gkFeed">Your feed goes here!</p>.

This is a sample help message. Use <p class="gkHelp">Your help message goes here!</p>.

This is a sample images message. Use <p class="gkImages">Your images message goes here!</p>.

This is a sample lock message. Use <p class="gkLock">Your webcam goes here!</p>.

This is a sample printer message. Use <p class="gkPrinter">Your printer message goes here!</p>.

This is a sample report message. Use <p class="gkReport">Your report message goes here!</p>.

This is a sample script message. Use <p class="gkScript">Your script goes here!</p>.

This is a sample time message. Use <p class="gkTime">Your time message goes here!</p>.

This is a sample user message. Use <p class="gkUser">Your user message goes here!</p>.

This is a sample world message. Use <p class="gkWorld">Your world goes here!</p>.

This is a sample cart message. Use <p class="gkCart">Your cart message goes here!</p>.

This is a sample cd message. Use <p class="gkCd">Your cd message goes here!</p>.

This is a sample chart_bar message. Use <p class="gkChartBar">Your chart_bar goes here!</p>.

This is a sample chart_line message. Use <p class="gkChartLine">Your chart_line message goes here!</p>.

This is a sample chart_pie message. Use <p class="gkChartPie">Your chart_pie message goes here!</p>.

This is a sample clock message. Use <p class="gkClock">Your clock goes here!</p>.

This is a sample cog message. Use <p class="gkCog">Your cog message goes here!</p>.

This is a sample coins message. Use <p class="gkCoins">Your coins message goes here!</p>.

This is a sample compress message. Use <p class="gkCompress">Your compress goes here!</p>.

This is a sample computer message. Use <p class="gkComputer">Your computer message goes here!</p>.

This is a sample cross message. Use <p class="gkCross">Your cross message goes here!</p>.

This is a sample disk message. Use <p class="gkDisk">Your disk goes here!</p>.

This is a sample error message. Use <p class="gkError">Your error message goes here!</p>.

This is a sample exclamation message. Use <p class="gkExclamation">Your exclamation message goes here!</p>.

This is a sample film message. Use <p class="gkFilm">Your film goes here!</p>.

This is a sample folder message. Use <p class="gkFolder">Your folder message goes here!</p>.

This is a sample group message. Use <p class="gkGroup">Your group message goes here!</p>.

This is a sample heart message. Use <p class="gkHeart">Your heart goes here!</p>.

This is a sample house message. Use <p class="gkHouse">Your house message goes here!</p>.

This is a sample image message. Use <p class="gkImage">Your image message goes here!</p>.

This is a sample information message. Use <p class="gkInformation">Your information message goes here!</p>.

This is a sample magnifier message. Use <p class="gkMagnifier">Your magnifier message goes here!</p>.

This is a sample money message. Use <p class="gkMoney">Your money goes here!</p>.

This is a sample new message. Use <p class="gkNew">Your new message goes here!</p>.

This is a sample note message. Use <p class="gkNote">Your note message goes here!</p>.

This is a sample page message. Use <p class="gkPage">Your page goes here!</p>.

This is a sample page_white message. Use <p class="gkPage_white">Your page_white message goes here!</p>.

This is a sample plugin message. Use <p class="gkPlugin">Your plugin message goes here!</p>.

This is a sample accept message. Use <p class="gkAccept">Your accept goes here!</p>.

This is a sample add message. Use <p class="gkAdd">Your add message goes here!</p>.

This is a sample camera message. Use <p class="gkCamera">Your camera message goes here!</p>.

This is a sample brick message. Use <p class="gkBrick">Your brick goes here!</p>.

This is a sample box message. Use <p class="gkBox">Your box message goes here!</p>.

This is a sample calendar message. Use <p class="gkCalendar">Your calendar message goes here!</p>.

Icon set 2

This is a sample audio message. Use <p class="gkAudioIs2">Your audio message goes here!</p>.

This is a sample email message. Use <p class="gkEmailIs2">Your email message goes here!</p>.

This is a sample feed message. Use <p class="gkFeedIs2">Your feed message goes here!</p>.

This is a sample images message. Use <p class="gkImagesIs2">Your images message goes here!</p>.

This is a sample lock message. Use <p class="gkLockIs2">Your lock message goes here!</p>.

This is a sample printer message. Use <p class="gkPrinterIs2">Your printer message goes here!</p>.

This is a sample time message. Use <p class="gkTimeIs2">Your time message goes here!</p>.

This is a sample user message. Use <p class="gkUserIs2">Your calendar message goes here!</p>.

This is a sample world message. Use <p class="gkWorldIs2">Your world message goes here!</p>.

YThis is a sample cart message. Use <p class="gkCartIs2">Your cart message goes here!</p>.

This is a sample cd message. Use <p class="gkCdIs2">Your cd message goes here!</p>.

This is a sample chart line message. Use <p class="gkChartLineIs2">Your chart line message goes here!</p>.

This is a sample chart pie message. Use <p class="gkChartPieIs2">Your calendar message goes here!</p>.

This is a sample clock message. Use <p class="gkClockIs2">Your clock message goes here!</p>.

This is a sample config message. Use <p class="gkCogIs2">Your config message goes here!</p>.

This is a sample computer message. Use <p class="gkComputerIs2">Your computer message goes here!</p>.

This is a sample error message. Use <p class="gkErrorIs2">Your error message goes here!</p>.

This is a sample exclamation message. Use <p class="gkExclamationIs2">Your exclamation message goes here!</p>.

This is a sample movie message. Use <p class="gkFilmIs2">Your movie message goes here!</p>.

This is a sample folder message. Use <p class="gkFolderIs2">Your folder message goes here!</p>.

This is a group calendar message. Use <p class="gkGroupIs2">Your group message goes here!</p>.

This is a sample house message. Use <p class="gkHouseIs2">Your house message goes here!</p>.

This is a sample image message. Use <p class="gkImageIs2">Your image message goes here!</p>.

This is a sample information message. Use <p class="gkInfromationIs2">Your information message goes here!</p>.

This is a sample magnifier message. Use <p class="gkMagnifierIs2">Your magnifier message goes here!</p>.

This is a sample money message. Use <p class="gkMoneyIs2">Your money message goes here!</p>.

This is a sample page message. Use <p class="gkPageIs2">Your page message goes here!</p>.

This is a sample camera message. Use <p class="gkCameraIs2">Your camera message goes here!</p>.

This is a calendar feed message. Use <p class="gkCalendarIs2">Your calendar message goes here!</p>.

This is a sample contact message. Use <p class="gkContactIs2">Your contact message goes here!</p>.

This is a sample facebook message. Use <p class="gkFacebookIs2">Your facebook message goes here!</p>.

This is a sample like it message. Use <p class="gkLikeItIs2">Your like it message goes here!</p>.

This is a sample twitter message. Use <p class="gkTwitterIs2">Your twitter message goes here!</p>.

This is a sample video message. Use <p class="gkVideoIs2">Your video message goes here!</p>.

This is a sample youtube message. Use <p class="gkYoutubeIs2">Your youtube message goes here!</p>.

Icon set 3

This is a sample audio message. Use <p class="gkAudioIs3">Your audio message goes here!</p>.

This is a sample camera message. Use <p class="gkCameraIs3">Your camera message goes here!</p>.

This is a sample lock message. Use <p class="gkLockIs3">Your lock message goes here!</p>.

This is a sample user message. Use <p class="gkUserIs3">Your user message goes here!</p>.

This is a sample cart message. Use <p class="gkCartIs3">Your cart message goes here!</p>.

This is a sample chart bar message. Use <p class="gkChartBarIs3">Your chart bar message goes here!</p>.

This is a sample config message. Use <p class="gkConfigIs3">Your config message goes here!</p>.

This is a sample configuration message. Use <p class="gkConfig2Is3">Your configuration message goes here!</p>.

This is a sample computer message. Use <p class="gkComputerIs3">Your computer message goes here!</p>.

This is a sample coffe message. Use <p class="gkCoffeIs3">Your coffe message goes here!</p>.

This is a sample cross message. Use <p class="gkCrossIs3">Your cross message goes here!</p>.

This is a sample error message. Use <p class="gkErrorIs3">Your error message goes here!</p>.

This is a sample house message. Use <p class="gkHouseIs3">Your house message goes here!</p>.

This is a sample information message. Use <p class="gkInformationIs3">Your inforation message goes here!</p>.

This is a sample magnifier message. Use <p class="gkMagnifierIs3">Your magnifier message goes here!</p>.

This is a sample page message. Use <p class="gkPageIs3">Your page message goes here!</p>.

This is a sample lock message. Use <p class="gkLockIs3">Your lock message goes here!</p>.

This is a sample camera message. Use <p class="gkCameraIs3">Your camera message goes here!</p>.

This is a sample star message. Use <p class="gkStarIs3">Your star message goes here!</p>.

This is a sample telephone message. Use <p class="gkTelephoneIs3">Your telephone message goes here!</p>.

Tooltips

Here are some examples of a ClassicThis is just an example of what you can do using a CSS tooltip, feel free to get creative and produce your own!, CriticalCriticalThis is just an example of what you can do using a CSS tooltip, feel free to get creative and produce your own!, HelpHelpThis is just an example of what you can do using a CSS tooltip, feel free to get creative and produce your own!, InformationInformationThis is just an example of what you can do using a CSS tooltip, feel free to get creative and produce your own! and WarningWarningThis is just an example of what you can do using a CSS tooltip, feel free to get creative and produce your own! CSS powered tooltip. This is just an example of what you can do so feel free to get creative and produce your own!

Highlights

This is a highlight phrase. Use <span class="gkHighlight1">Your highlight phrase goes here!</span>.

This is a highlight phrase. Use <span class="gkHighlight2">Your highlight phrase goes here!</span>.

This is a highlight phrase. Use <span class="gkHighlight3">Your highlight phrase goes here!</span>.

This is a highlight phrase. Use <span class="gkHighlight4">Your highlight phrase goes here!</span>.

Code

Below is a sample of <pre> or <div class="gkCode1">

#wrapper {
  position: relative;
  float: left;
  display: block;
}

Below is a sample of <div class="gkCode2">

Below is a sample of <div class="gkCode3"><h4>Name of your file</h4>Here goes your code</div>

Unordered lists

Types of unordered lists

Ordered lists

Types of ordered list:

<div class="gkNumber1"><p><span>here goes a number</span>and here text of element</p>

<div class="gkNumber2"><p><span>here goes a number</span>and here text of element</p>

Abbrs and acronyms

This is a sample of an abbreviation Dr. Use <abbr title="Here goes full word or phrase">here goes an abbreviation</abbr>

This is a sample of an acronym NATO. Use <acronym title="Here goes full phrase">here goes an acronym</abbr>

Definition lists

Below are samples of definition lists

<dl class="gkDef1"><dt>Here goes the word you're about to define</dt><dd>Here goes definition</dd></dl>

Butter

it is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications such as baking, sauce making, and frying. Butter consists of butterfat, water and milk proteins.

Dairy milk

is an opaque white liquid produced by the mammary glands of mammals (including monotremes). It provides the primary source of nutrition for newborn mammals before they are able to digest other types of food.

<dl class="gkDef2"><dt>Here goes the word you're about to define</dt><dd>Here goes definition</dd></dl>

Butter

it is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications such as baking, sauce making, and frying. Butter consists of butterfat, water and milk proteins.

Dairy milk

is an opaque white liquid produced by the mammary glands of mammals (including monotremes). It provides the primary source of nutrition for newborn mammals before they are able to digest other types of food.

<dl class="gkDef3"><dt>Here goes the word you're about to define</dt><dd>Here goes definition</dd></dl>

Butter

it is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications such as baking, sauce making, and frying. Butter consists of butterfat, water and milk proteins.

Dairy milk

is an opaque white liquid produced by the mammary glands of mammals (including monotremes). It provides the primary source of nutrition for newborn mammals before they are able to digest other types of food.

Legends

Dropcaps

This is a sample text with Dropcap. Use <p> <span class="gkDropcap1">t</span> to make the first letter larger. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue. Duis quis quam sed purus porta eleifend. Vivamus ullamcorper est id libero aliquam ullamcorper. Donec eget dignissim augue. Donec ante felis, aliquam ut consequat eget, lobortis dapibus risus. Aliquam laoreet enim et lectus ornare hendrerit. Aliquam rhoncus enim libero. Morbi aliquam, nibh mattis feugiat dapibus, nisi massa adipiscing justo, sit amet condimentum urna ipsum et lacus. Nam fermentum, eros quis ullamcorper convallis, libero mauris lacinia eros, sed tempus leo lorem vitae purus. Nunc a malesuada felis. Cras ultrices sapien eu nisi elementum non blandit urna sodales. Duis accumsan cursus massa, eu facilisis diam porta ut..</p>.

This is a sample text with Dropcap. Use <p> <span class="gkDropcap2">t</span> to make the first letter larger. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue. Duis quis quam sed purus porta eleifend. Vivamus ullamcorper est id libero aliquam ullamcorper. Donec eget dignissim augue. Donec ante felis, aliquam ut consequat eget, lobortis dapibus risus. Aliquam laoreet enim et lectus ornare hendrerit. Aliquam rhoncus enim libero. Morbi aliquam, nibh mattis feugiat dapibus, nisi massa adipiscing justo, sit amet condimentum urna ipsum et lacus. Nam fermentum, eros quis ullamcorper convallis, libero mauris lacinia eros, sed tempus leo lorem vitae purus. Nunc a malesuada felis. Cras ultrices sapien eu nisi elementum non blandit urna sodales. Duis accumsan cursus massa, eu facilisis diam porta ut..</p>.

This is a sample text with Dropcap. Use <p class="gkDropcap3"> <span class="gkDropcap3">t</span> to make the first letter larger. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue. Duis quis quam sed purus porta eleifend. Vivamus ullamcorper est id libero aliquam ullamcorper. Donec eget dignissim augue. Donec ante felis, aliquam ut consequat eget, lobortis dapibus risus. Aliquam laoreet enim et lectus ornare hendrerit. Aliquam rhoncus enim libero. Morbi aliquam, nibh mattis feugiat dapibus, nisi massa adipiscing justo, sit amet condimentum urna ipsum et lacus. Nam fermentum, eros quis ullamcorper convallis, libero mauris lacinia eros, sed tempus leo lorem vitae purus. Nunc a malesuada felis. Cras ultrices sapien eu nisi elementum non blandit urna sodales. Duis accumsan cursus massa, eu facilisis diam porta ut..</p>.

Floated blocks

Below are samples of text in which part of it is displayed in a separate block

<p> Here goes main part of the text <span class="gkBlockTextLeft">Block of text</span>rest of the text</p>

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue. Duis quis quam sed purus porta eleifend.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue.Donec eget dignissim augue. Donec ante felis, aliquam ut consequat eget, lobortis dapibus risus. Aliquam laoreet enim et lectus ornare hendrerit. Aliquam rhoncus enim libero. Morbi aliquam, nibh mattis feugiat dapibus, nisi massa adipiscing justo, sit amet condimentum urna ipsum et lacus. Nam fermentum, eros quis ullamcorper convallis, libero mauris lacinia eros, sed tempus leo lorem vitae purus. Nunc a malesuada felis. Cras ultrices sapien eu nisi elementum non blandit urna sodales. Duis accumsan cursus massa, eu facilisis diam porta ut. Morbi cursus est vel velit hendrerit dictum.

<p> Here goes main part of the text <span class="gkBlockTextRight">Block of text</span>rest of the text</p>

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue. Duis quis quam sed purus porta eleifend.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum condimentum pulvinar justo, sed faucibus ligula feugiat ac. Morbi quis enim nulla, vel congue augue.Donec eget dignissim augue. Donec ante felis, aliquam ut consequat eget, lobortis dapibus risus. Aliquam laoreet enim et lectus ornare hendrerit. Aliquam rhoncus enim libero. Morbi aliquam, nibh mattis feugiat dapibus, nisi massa adipiscing justo, sit amet condimentum urna ipsum et lacus. Nam fermentum, eros quis ullamcorper convallis, libero mauris lacinia eros, sed tempus leo lorem vitae purus. Nunc a malesuada felis. Cras ultrices sapien eu nisi elementum non blandit urna sodales. Duis accumsan cursus massa, eu facilisis diam porta ut. Morbi cursus est vel velit hendrerit dictum.

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DRBD:
DRBD (Distributed Replicated Block Device) forms the storage redundancy portition of a HA cluster setup. Explained in basic terms DRBD provides a means of achieving RAID 1 behavoir over a network, where whole block devices are mirrored accross the network.

To start off you will need 2 indentically sized raw drives or partitions. Many how-to's on the internet assume the use of whole drives, of course this will be better performance, but if you are simply getting familar with the technology you can repartition existing drives to allow for two eqaully sized raw partitions, one on each of the systems you will be using.

There are 3 DRBD replication modes:
• Protocol A: Write I/O is reported as completed as soon as it reached local disk and local TCP send buffer
• Protocol B: Write I/O is reported as completed as soon as it reached local disk and remote TCP buffer cache
• Protocol C: Write I/O is reported as completed as soon as it reached both local and remote disks.

If we were installing the HA cluster on a slow LAN or if the geogrphical seperation of the systems involved was great, then I recommend you opt for asyncronous mirroring (Protocol A) where the notifcation of a completed write operation occurs as soon as the local disk write is performed. This will greatly improve performance.

As we are setting up our HA cluster connected via a fast LAN, we will be using DRBD in fully syncronous mode, protocol C.
Protocol C involves the file system on the active node only being notified that the write operation was finished when the block is written to both disks of the cluster. Protocol C is the most commonly used mode of DRBD.

/etc/drbd.conf

global { usage-count yes; }
common { syncer { rate 10M; } }
resource r0 {
protocol C;
net {
max-buffers 2048;
ko-count 4;
}
on bailey {
device    /dev/drbd0;
disk      /dev/sda4;
address   192.168.1.125:7789;
meta-disk internal;
}
on giskard {
device    /dev/drbd0;
disk      /dev/sda3;
address   192.168.1.127:7789;
meta-disk internal;
}
}

drbd.conf explained:

Global section, usage-count. The DRBD project keeps statistics about the usage of DRBD versions. They do this by contacting a HTTP server each time a new DRBD version is installed on a system. This can be disabled by setting usage-count no;.

The common seciton contains configurations inhereted by all resources defined.
Setting the syncronisation rate, this is accoimplished by going to the syncer section and then assigning a value to the rate setting. The syncronisation rate refers to rate in which the data is being mirrored in the background. The best setting for the syncronsation rate is related to the speed of the network with which the DRBD systems are communicating on. 100Mbps ethernet supports around 12MBps, Giggabit ethernet somewhere around 125MBps.

in the configuration above, we have a resource defined as r0, the nodes are configured in the "on" host subsections.
"Device" configures the path of the logical block device that will be created by DRBD
"Disk" configures the block device that will be used to store the data.
"Address" configures the IP address and port number of the host that will hold this DRBD device.
"Meta-disk" configures the location where the metadata about the DRBD device will be stored.
You can set this to internal and DRBD will use the physical block device to store the information, by recording the metadata within the last sections of the disk.
Once you have created your configuration file, you must conduct the following steps on both the nodes.

Create device metadata.

$ drbdadm create-md r0
v08 Magic number not found
Writing meta data...
initialising activity log
NOT initialized bitmap
New drbd meta data block sucessfully created.
success

Attach the backing device.
$ drbdadm attach r0

Set the syncronisation parameters.
$ drbdadm syncer r0

Connect it to the peer.
$ drbdadm connect r0

Run the service.
$ service drbd start

Heartbeat:

Heartbeat provides the IP redundancy and the service HA functionailty.
On the failure of the primary node the VIP is assigned to the secondary node and the services configured to be HA are started on the secondary node.

Heartbeat configuration:

/etc/ha/ha.conf

## /etc/ha.d/ha.cf on node1
## This configuration is to be the same on both machines
## This example is made for version 2, comment out crm if using version 1
// replace the node variables with the names of your nodes.

crm no
keepalive 1
deadtime 5
warntime 3
initdead 20
bcast eth0
auto_failback yes
node bailey
node giskard

/etc/ha.d/authkeys
// The configuration below set authentication off, and encryption off for the authentication of nodes and their packets.
//Note make sure the authkeys file has the correct permisisions chmod 600

## /etc/ha.d/authkeys
auth 1
1 crc

/etc/ha.d/haresources
//192.168.1.40 is the VIP (Virtual IP) assigned to the cluster.
//the "smb" in the configuration line represents the service we wish to make HA
// /devdrbd0 represents the resource name you configured in the drbd.conf

## /etc/ha.d/haresources
## This configuration is to be the same on both nodes

bailey 192.168.1.40 drbddisk Filesystem::/dev/drbd0::/drbdData::ext3 smb