1. Introduction - Documentation
Contents
1. Basic Operations Help Doc Links Zeus Quick Start Guide 1 Introduction 2 Downloading Zeus Software 3 Installing Zeus Software 4 Integrate Zeus Software with WANdisco 5 Basic Operations 6 Setting up IP Sharing 7 Installing the node monitoring script 8 Getting more help 1 Introduction WANdisco SVN MultiSite Cluster Subversion clients Zeus software has been selected to provide a high availability application specific load balancing solution for use in conjunction with WANdisco Clustering products This brief quick start guide shows you how to set up the Zeus software to load balance between nodes in a Subversion MultiSite cluster 1 1 Before you begin D must install configure and start Zeus software as the Root user Root privileges are necessary to bind to the restricted lower ports You may login as the Root user with the following su Password x xx xx xx xxxx D that you have your Zeus license key saved to your installation directory e g usr local zeus before starting We would have sent you the license key via email contact WANdisco sales if you re unable to find your license key See Installing a new Zeus license 2 Downloading Zeus Software This sections shows you how to get the Zeus software 2 1 Download the Zeus software from the WANdisco download website to your installation server Software Download Page Subversion Wullisite v3 T build 2616 evnrep tar az2. External program monitor from the dropdown ilaa SIP monitor RTSP monitor The scope of the monitor does it affect each node separately or does tt affect all the nodes Name Enter a name for the monitor type Select External program monitor and then select the read_only_ monitor pl script from the dropdown scope Select Monitor each node separately then click Create Monitor The page will refresh to confirm that the configuration has been updated 7 6 Click on the Services button localhost localdomain fadmin admin Logout gt 3 O D wm Services Catalogs Diagnose Activity System ae ue Home 7 7 Click on the Pools tab j 7 e u 60rd A 2 localhostlo Home Services Catalogs Diagnose Activity System r Configuring Traffic IP Groups Virtual Servers Poot ji Config Summary Virtual Virtual Servers Unfold All Fold All Servers A virtual server accepts network traffic and processes It It normally gives each connection to a pool the pool then forwards the traffic to a server node 7 8 Click on your chosen pool s Edit link Configuring Traffic IP Groups Virtual Servers Pools Config Summary Pools Unfold All Fold All A pool manages a group of server nodes It routes traffic to the most appropriate node based on load balancing and session persistence cr
3. Header Settings Ha ode retin a Sd or SOF rediret respons code Che Location Meader in the responte can be wnten Tiig may be necessary f the node retums a redirect locaton with tha wrong protocol HTTP HTTPS hogtnaene or post How the wrtual server hands conection Gimeouts amp Comnection Error Settings Hes The wriua sarme manages connection erma Memory Limits The imis on how muuch memar pour virtual server may ude for ach connection om 4 16 Update the connect_timeout keepalive_ timeout and timeout values to 0 Then click Update under the Apply Changes at the bottom of the screen Y Timeout Settings How the virtual server handles connection imeouts A connection that has not received any data should be dosed after this period of tima A value of wall disable this timeout connect_timeout E seconds How long should the virtual server keep an idle keepalve connection before discarding it A value of 0 will mean that the keepalves are never closed by your trafic manager O O 0 Seconds A connection should be dosed fino additional data has been re enred for this pened of time A value of 0 will detable this timeout timeout seconds 4 17 Test that the Zeus software is handling traffic Browse to one of your WANdisco nodes using the port you assigned for load balancing port 80 was used as an example in step 4 5 although it can be any port You ll be able to access the node on the load balancing port
4. group From the Zeus Administration Server go to Services gt Traffic IP Groups 6 11 Under the Create a new Traffic IP Group section fill in as a per this screenshot Create a new Traffic IP Group Name SharedlP Traffic Managers ubuntu 910 build shef wandisco com F 10 f 2 a 6 80 i vzeusload01 shef wandisco com 10 2 2 00 10 22194 O Raise each address on a single machine Single Hosted mode Raise each address on every machine in the group Multi Hosted mode IPv4 only Multicast IP to share data with 239 101 1 2 6 12 Once you have a traffic IP group you can bind services to it as shown below Traffic IP Groups Virtual Servers gt SVN Pools Contig Summary Virtual Server SVN HTTP port 80 SVN Servers Default Poals used by this virtual server Last Modified 25 Mar 2010 14 11 Y v Basic Settings The basic settings specify the internal virtual server protocol that is used for traffic inspection the po default pool for handling traffic Name SVN Internal Protocol HTTP Port 80 Default Traffic Pool SVN Servers Listening on D All IP addresses Traffic IP Groups Traffic IP Group Select Test E J Domain names and IP addresses Notes 6 13 IP Sharing is now set up For more information visit the Zeus Knowledge Hub Troubleshooting The following articles may help you if you problems relating to your Zeus IP Sharing Why Can
5. load balancers you re able to add them automatically to a pre exiting cluster If you add the load balancer to an existing cluster it will automatically inherit the settings of the load balancers already in the cluster 3 10 Select a password to use when logging in to the Zeus Administration Server The Username is automatically admin Please choose a password for the admin server Re enter e 3 11 To set the Zeus software to automatically start when the server boots enter Y Otherwise enter N Zeus Traffic Manager can be installed so that it automatically runs when this computer boots Start script Linked into fetc re5 d S85zeus Configuration successful Starting Zeus Traffic Manager Software J e 3 12 The setup configuration is now complete The Zeus software will start up and you ll be directed to the web interface of the Zeus Administration Server Configuration successful Starting Zeus Traffic Manager Software OK To configure the Zeus Traffic Manager please go to LocaLhost 9090 and Login as admin with your admin password Please read the release notes usr local zeus zxtm RELEASE NOTES root Fed11 ZeusTM 6 r3 Linux x86 2 Open a browser and point it at Herps lt Seivec I Ol MoOSimeame gt S00 When you access the website for the first time you will see an error message because of the invalid SSL certificate Nevertheless the connection is completely encrypted and you ca
6. 07 Oy Oy 07 7 Oy Oy 07 D7 Oy Oy admin 6 6r3 tar CORON LICENSE MANIFEST README RELEASE NOTES feus_6 0 Software_Getting Started pdf feus_6 0_User_Manual pdf zinstall zxtme 6 0r3 tar zxtmadmin 6 6r3 tar zxtmadmin_lLang_en_gb 6 6r3 tar zXtmadmin_lLang_en_us 6 6r3 tar 3 1 From the Zeus install directory see step 2 3 run the installer by entering the command f Maisie ell 3 2 Read through the product license press return to read to the end Type in accept to continue with the installation 12 10 Contracts Rights of Third Parties Act The Contracts Rights of Third Parties Act 1999 shall not apply to this Agreement and nothing in this Agreement confers or purports to confer on any third party any benefit or any right to enforce any term of this Agreement or operates to give any third party the right to enforce any term of this Agreement except as expressly provided herein Enter eccept to accept this License or press retum to abort accept e 3 3 You ll be prompted for an installation path Press Enter to accept the default path usr local zeus Enter accept to accept this License or press retum to abort accept Where should the product be installed usr local zeus D can install the software anywhere on your file system but you should not install it in the same directory as any other Zeus products e 3 4 The Zeus software is now installed you re prompted to continue w
7. INFO Flipper started aa Fedii 2 Examine logs e 4 3 Next add a service using the first option Manage a new service from the Wizards drop down menu Fedl11 2 shef ema O O Wizarde oo l Wizedls Home Sernices Catslogs Diagnose Activity System Slop 4 node draining Traffic En i SSL Oecrypl a samice Managers Joo a cluster Fedil 2 Enabla Disable e nule 10 2 5 62 Backup my conhiguraben Restore trom a backup e 4 4 A pop up window will appear beginning a series of 4 steps for adding a new service virtual server Click Next Manage a new Service step 1 of 4 1 Manage a new Service This wizard will guide you through the process of managing a new service It will require information such as the type of service to be managed and the back end nodes that the service will be balanced to e 4 5 Enter a name for the service and confirm what protocol and port it will use Manage a new Service step 2 of 4 2 Specify the service Please enter a brief name to identify the service you would like to balance Name WANdisco SVN Traffic Please select the protocol that the service uses Protocol HTTP Port a0 4 6 Enter the IP address and port for each of your WANdisco nodes Manage a new Service step 3 of 4 3 Specify the back end nodes Please enter the hostname and port of each node Hostname 10 25 25 Port To remove a node from t
8. Release Notes EOMB ObLlEelib2 Zeus Load Balancer 6 0 Linu 4G 64 pad Balancer 6 004 LINUK xb By using sotteware of WANdisco Inc or ts subsidiaries ANcisco i you agree to the terms and conditions oft entered inte with WAN disc For more details please refer to that FE CENTE aQrecemens he license agreement you hawe Ensure you download the appropriate 32 bit or 64 bit version o software requires approximately 250MB of disk space during installation Removing temporary installation files cuts the required drive space to about 100MB 2 2 Extract the archive file to the install directory i e usr local zeus where you saved your license key You might use the tar command ieee zxy A c uS WIM 1S One o T Linn oo IES 4 2 3 Change to the new Zeus directory ecd ZeusTM 60r3 Linux x86 total 101048 FW w F 1 ArwWXTWXT X 4 F Eai JJJ ie i ie ee Be RFR ee eee ee ee errre ire a rier evra die ers i i i d4 root root root root root root root root root root root root root SYS 8355840 sys 4096 SyS 24677 sys 1801 sys 5105 sys 122416 sys 838058 sys 3700472 sy5 9008 sys 54358080 sys 1609316480 sys 16246 sys 18503680 3 Installing Zeus Software 2010 01 20 2010 01 20 2010 01 20 2010 01 26 2010 01 20 2010 01 20 2010 01 20 2010 01 20 2010 01 20 2010 01 20 2010 0L 20 2010 01 20 2010 01 20 This section covers the software installation Oy
9. and also see the traffic management details by viewing the Connections tab on the Activity section of the Zeus Administration Server screen a OJO Home Services Catalogs Diagnose Activity System Current Activity Historical Activity Connections Draining Nodes Content Cache View Berens This table shows a summary of the connections currently being processed and also shows se Show connections for All nodes Download dats From Via To State VServer Current Rule Pool No connections are currently established Recent requests 10 2 5 16 60232 10 2 5 41 5000 10 2 5 25 80 WANdisco SVN WANdisco SVN 10 2 5 16 60233 10 2 5 41 5000 10 2 5 25 80 WANdisco SVN WANdisco SVN 10 2 5 16 60233 10 2 5 41 5000 10 2 5 25 80 WANdisco SVN WANdisco SVN 10 2 5 16 60232 10 2 5 41 5000 10 2 5 25 80 WANdisco SVN WANdisco SVN 10 2 5 16 60233 10 2 5 41 5000 10 2 5 25 30 WANdisco SVN WANdisco SVN 10 2 5 16 60233 10 2 5 41 5000 10 2 5 25 80 WANdisco SVN WANdisco SVN 10 2 5 16 60232 10 2 5 41 5000 10 2 5 25 30 WANdisco SVN WANdisco SVN The Zeus software has been successfully set up You should repeat the process for any additional load balancers you wish to add to the cluster 5 Basic Operations Stopping Zeus Software You can stop the software running by running the following command as root lt ZMUSHOME gt SEOD Zeus Starting Zeus Software The Zeus softwar
10. e starts automatically at the end of the configuration sequence Having stopped the software you can restart it using the following command as root lt ZEUSHOME gt start zeus Changing the Zeus Software configuration You can re run the configure script to change any or all of the settings that were chosen in section 4 or you can use it to remove the software cleanly from your machine and any cluster it was in before clearing the installation files from your machine AniOiS OMY zascternh cloaca gure Installing a new Zeus license You don t need to have a valid license installed in order to start the Zeus service or web interface however you should use this procedure to install your license before going into production 1 Open the Zeus web interface and click on the System button on the top menu bar Fal gt zeus localhost localdomain admin admin Logout O 0 O OG 2 Home Services Catalogs Diagnose Acti Help r Cluster OK 2 Click on the Licenses tab gt zeus localhost localdomain admin admin Logout j D 7 Wizards Home Services Catalogs Diagnose Activity System Traffic Traffic Ma nagers Managers System Linux localhost localdomain 2 6 18 164 el5 1 SMP Thu Sep 3 isese tog 03 33 56 EDT 2009 i686 l Software Version 6 0r4 Build date Feb 10 2010 09 17 17 localhost localdomain Architecture x86 10 2 6 60 License Senal 20069 Installed at f
11. he list select it and press Remove node 4 7 The wizard ends with a Summary of your settings In example shown below it confirms that web port80 traffic will be load balanced across the cluster on a selected port in this case port 5000 Click Finish to close the wizard and return to the main screen Manage a new Service step 4 of 4 You have chosen to create a virtual server with the following settings Description Wandisco SVN Traffic Protocol http port 80 This virtual server will balance traffic onto the following nodes Nodes 10 2 5 25 80 To create this service press Finish To change your settings press Back e 4 8 You need to make a change to the default settings of the WANdisco service you just created Click on the title link on the Default Pool Fed11 7 S06f Wandises com admin odmi Logout w 0000 Home Services Catalogs Diagnosa Actiity System Help Managers Fed11 2 10 2 5 652 Services yig Wandisco SVN Traffic v ARN Traffic HTTP S000 Running ee ns All modes are OK o replication technology doesn t support the load balancing of a single session applying IP based session persistence ensures that each client session is pinned to a single node in the cluster e 4 9 On the Pool s settings click Edit on the Session Persistence bar Pools Pool Wandisco SVN Traffic HTTP 1 node Unfold All Fold Al
12. iteria b WANdisco SVN Traffic HTTP 2 nodes 7 9 Click on the Edit link for the Health Monitoring section gt Bandwidth Management Edit A Bandwidth Management Class in a Pool limits the upstream bandwidth to the backend nodes 7 10 Select your new monitor from the dropdown and click Add Monitor Ensure that the Passive monitoring is set to Yes if not select it and click Update Pool WANdisco SVN Traffic HTTP 2 nodes Monitors watch the nodes in a pool and inform the traffic manager if th nodes are functioning correctly Manage monitors in catalog Passive monitoring Should your traffic manager check that real requests i e not those from the monitors appear to be working to this pool of machines This should normally be enabled so that if your traffic manager sees that a node is refusing connections responding too slowly or sending back invalid data it can mark that node as failed and stop sending requests to it If this is disabled you will need to ensure that there are suitable monitors configured to check your servers instead passive_monitoring Ne The monitor script is now installed It s important that if you upgrade your version of the Zeus software that you check back with WANdisco to ensure that the script remains compatible 8 Getting more help Documentation You can download a copy of the Zeus software User Manual for information about advanced configuration function and troub
13. ith the setup Click Enter to proceed This program will install the Zeus Traffic Manager product Installing zxtm 6 0r3 Installing admin 6 0r3 Installing zxtmadmin 6 6r3 Installing zxtmadmin_lang_en_us 6 6r3 Installing zxtmadmin_lang_en_gb 6 0r3 Zeus Traffic Manager is now installed in usr local zeus If you choose to complete the configuration later you can return to this point in the setup by running ZEUS HOME y a e m eon Tur e 3 5 Enter the absolute path to the Zeus software license key we ll have provided this in an email and click Enter Are you ready to perform the initial configuration now Y N Y Y Running usr local zeus zxtm configure Zeus Configuration Program Copyright C Zeus Technology 2010 This program will perform the initial configuration of the Zeus Traffic Manager This product requires a valid License key file to run It will run in unlicensed mode if none is supplied Enter the key filename or Leave blank for unlicensed mode usr local zeus ztm key Copying License key done o you continue to install without referencing a license key you ll complete the installation in unlicensed mode in which the software will start but will not allow you to configure and run any services 3 6 Enter an owning user and group for the zxtm process or click Enter to leave it unrestricted Copying License key done Choose a UNIX user for the zxtm process to run as
14. l Wertual servers that Pools that use this pool a Wandisco SVN Traffic use this pogl as their fadure pool ee Last Modified 5 Mar 2010 16 51 E Basic Settings The basi settings specify the nodes that the pool is balanang traffic to P Load Balancing Edit Load Balancing controls how the pool distributes traffic across its modes Session Persistence controls how the pool ansures that dient sessions are comsrstently cderacted to the same nodes gt Bandwidth Management Edit A Bandwidth Management Class in a Pool limits the upstream bandwidth to the backend nodes Health Monitoring Edit Adding maniters to a pool enables the status of backend nodes to be known more accurately B SSL Settings Edit Enable and configure SSL encryption between the pool and its back end nodes E Connection Management Edit 4 10 Click on the Create New Session Persistence Class link O Wizards x Services Catalogs Diagnose Activity System Configuring Traffic IP Groups Virtual Servers Edit Session Pool Wandisco SWN Traffic HTTP 1 node Persistence Sessor Persistence ensures that all requests from a chent will always get sent to the same mode YOu are not using a Session Persistence dass with this pool Choose Session Persistence Class There are no Session Persistence classes to choose from 4 11 Enter a name such as IP Persistence click on the checkbox to associate the
15. leshooting Knowledge Hub Go to the Zeus Knowledge Hub http knowledgehub zeus com docs for Support Knowledgebase articles and further documentation Copyright 2010 WANdisco All Rights Reserved This product is protected by copyright and distributed under licenses restricting copying distribution and decompilation
16. module ztrans click to download 6 1 Install Zeus on two machines 6 2 Install the IP Transparency module ztrans 6 3 Ensure the kernel headers package is installed for the kernal distribution you are using 6 4 Unpack the Zeus modules tarball and cd into the directory created e Of toe xz zeus modules installer 2 1 tgz cd zeus_modules_installer 2 1 6 5 To install all modules login as root run the installation script install_modules pl e install_modules pl 6 6 The script will attempt to build and install both the kernel modules and should give you a helpful error message if it fails If you have problems see the Kerne Modules installation guide PDF provided by Zeus 6 7 Restart Zeus on both nodes ae ee lsaaic scl ASS TSS Bue ic 6 8 Check both Zeus nodes are running then from the Zeus Administration Server click on the drop down wizard and select J oin a cluster fount 910 buld shetwandisco com admin admin Logout H Wizards O Wizards Manage a new s enace Drain a node Renae a node Slop a node draining pa Backup my coniguration Restore from a backup anagers Multi Hosted IPs Edit s that are managed by a set of Traffic Managers The Traffic Managers ensure that each IP adi 6 9 Follow the wizard to complete the clustering selecting which other Zeus node you wish to join in the new cluster 6 10 It s now time to configure a traffic IP
17. n Safely confirm the error message 4 Integrate Zeus Software with WANdisco This section covers the software installation e 4 1 Enter the Zeus Administration Server with the Username admin and the password that you provided in step 3 11 Click Login Teus Administration Server Software Zeus Traffic Manager 6 0r3 Use of this software is subject to this End User License Agreement Login to Fed11 2 shef wandisco com Enter a username and password to access the administration server Username admin Password PT Tier y e 4 2 The Zeus Administration Server is broken down into four areas The Menu bar Traffic Managers Bar Services and Events Log Click on the Help button on the menu bar for a brief explanation of what everything does Tews Fedili 2 shef wandisco com admin admin Logout p TEE Cluster oe fanh 24 i Fah paa 000000 ve O a bs Home Services Catalogs Diagnose Activity System Help Managers soe 10 2 5 562 Services You have mot created any virtual servers yet so trafic is not being managed for any services Lise the Manage a new service weard fo cragt e a new Virtual Server and Poal Event Log w O4 Marf2010 17 47 02 0100 INFO Java Java started em Fedil 2 O4 Marf2010 17 17 12 0100 INFO Java Java started a Fodil 2 O4 Mar 2010 17 17 13 0100 INFO Zeus Traffic Manager running ame Fedil 2 O4 Marf2010 17 17 10 0100
18. nobody Choose a UNIX group for the zxtm process to run as nobody o Zeus software must be configured and started as root but it can be run as any user Running the process with no privileges ensures that it can never be used to compromise the security of your system 3 7 The management of the Zeus software can be restricted to a single IP for improved security To restrict management access to a single IP enter Y Otherwise enter N feus Traffic Manager can be configured to only allow management on one specific IP address This restricts all admin server access SOAP management and other control information to this IP This setup is useful if you want to completely separate your public and private networks Would you Like to restrict Zeus Traffic Manager management to one IP Y N NI EY 3 8 If you selected Y in step 3 8 you ll be prompted for the IP address on which the Zeus software can be managed Please enter the IP address to use 10 2 5 62 3 9 For the first installation you ll be creating a new cluster option C J ust press Enter Searching for Zeus Traffic Manager clusters done Which Zeus Traffic Manager cluster should this installation be added to C Create a new cluster 1 Cluster 1 localhost 9090 5 Specify another machine to contact R Refresh the cluster list Select option cl J The Zeus installer is able to detect pre existing Zeus clusters on the network When installing additional
19. on failure occurs should the session be deleted Note a failuremode of choosing a new node implicitly deletes the session A note used to describe this class note e 4 13 Click the Update button to Apply Changes A note used to describe this class note Apply Changes Save As New Class 4 14 Confirm that the configuration update has been accepted Catalogs Rules Java Monitors SSL Protection Persistence gt IP Persistence Bz o Your configuration has been updated Persistence Catalog Class IP Persistence Rules that use this Pools that Sra ie Wandisco SVN Traffic use this The Zeus software has been successfully set up You should repeat the process for any additional load balancers you wish to add to the cluster 4 15 Back on the Pool s settings screen edit the Timeout Settings ramsinadti shef wandesca com tadmin admin Logout Home Serces Catalogs Dispose actriby Sistem Helo Configuring Tralfic IP Groups Virtual Serr gt SVN gt Connie chon Managenent Connection Virtual Server SYN HTTP port 41 Uniold All y Fold AN Management Connection management setongs control how the virtual server manages conmectons from the remote dient E HTTP Specie Selling Hen the virtual server handles HTIF traffic b Cookie Settings These settings define how cookies are handed E Location
20. persistence with the WANdisco pool then click the Create Class button Zeus 6 0r3 m Fedii 2 shef wandisco O cuserox Ol 7 p Home Services Catalogs Diagnose Activity System Catalogs Rules Java Monitors SSL Protection Persistence Bandwidth SLM Session Session Persistence Catalog Persistence Catalog The Session Persistence Catalog contains a set of classes which control how to identify s the same node Your Session Persistence catalog is empty Create new Session Persistence class Name IP Persistence Create Class and associate it with pool Wandisco SVN Traffic 4 12 Set the basic settings of the Persistence by assigning the following values using the radio buttons o Which session method should be used IP based persistence o What action should the pool take if the session data Is invalid or cannot contact the node specified by the session Choose a new node to use o When a session failure occurs should the session be deleted Yes Name IP Persistence Which session persistence method should be used IP based persistence Send all requests from the same source address to the same node What action should the pool take if the session data is invalid or it cannot contact the node specified by the session O Redirect the user to a given URL O Close the connection using rror_fil on Pools gt Edit gt Connection Management When a sessi
21. t users connect to my multi host Multi hosted IP addresses with Zeus Software Zeus Timeout Settings 7 Installing the node monitoring script We provide a script zeus_read_only_monitor pl that can be used to monitor the status of your cluster nodes should a node become read only the Zeus software will then drop the node from the pool to ensure continued load balancing of the remaining nodes Once you have the script follow this procedure to install it The monitoring script has been tested on Zeus Software up to version 3 7 10 Contact us if you need to run the monitor on a later version 7 1 Copy the script zeus_read_only_monitor pl to your Zeus server placing it here usr local zeus lt zxlb version or zxtm version gt conf scripts e g usr local zeus zxtm 6 0r4 conf scripts 7 2 Go to the Zeus web interface e g neepa oe e IP NOt hesemame 2000 7 3 Click on the Catalogs link 0 OQO l Home Services Diagnose Actwity System Help 7 4 Click on the Monitors tab Catalogs contain sets of objects which you can use when configuring the services your traffic managers handle 7 5 Go to the bottom of the Monitors screen and complete the Create new monitor form Create new monitor Monitor name Name ReadOnhCheck The actual internal monitor type to use type Ping monitor TCP Connect monitor HTTP monitor TCP transaction monitor 10 ER Select the script
22. usr local zeus 3 Click on Browse and find your license key file Then Click Install Key Remove Selected Keys Install new License Key Install Key 4 You can now view your license details by clicking on the small triangle next to the license entry Should you need to you can remove the license by clicking on the checkbox and clicking the Removed Selected Keys button The following license keys are installed on your traffic manager License Serial Details Remove 200 v Used by traffic managers localhost localdomain Product Zeus Traffic Manager Platforms Linux Issued Wed Feb 24 00 00 00 2010 Expires Tue Aug 31 11 00 00 2010 7 Cluster size unlimited Additional Info j gt Customer Info NFR License Customer ID CEPI Remove Selected Keys 6 Setting up IP Sharing With IP sharing you can ensure that the multi hosted IP module shares incoming data traffic for an IP address across multiple hosts in a cluster This has the advantage of evening out the load distributed across every active node even when some nodes have failed Single hosted traffic IPs often end up with an uneven distribution of load when failure occurs as an entire IP s load is transferred to a single machine when the original host fails Requirements e Operating system Linux e Kernal Versions 2 6 8 1 2 6 31 e Zeus Software Version o IP Transparency 4 0 or higher o Multi hosted IPs 6 0 or greater e IP Transparency
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