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Symantec 5 manual About Veritas Cluster Server, About VCS basics

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Chapter 1

Introducing Veritas Cluster Server

This chapter includes the following topics:

■About Veritas Cluster Server

■About VCS basics

■About VCS features

■About VCS optional components

About Veritas Cluster Server

Veritas™ Cluster Server by Symantec is a high-availability solution for cluster configurations. Veritas Cluster Server (VCS) monitors systems and application services, and restarts services when hardware or software fails.

About VCS basics

A single VCS cluster consists of multiple systems that are connected in various combinations to shared storage devices. When a system is part of a VCS cluster, it is a node. VCS monitors and controls applications running in the cluster on nodes, and restarts applications in response to a variety of hardware or software faults.

Applications can continue to operate with little or no downtime. In some cases, such as NFS, this continuation is transparent to high-level applications and users. In other cases, a user might have to retry an operation, such as a Web server reloading a page.

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Symantec 5 manual About Veritas Cluster Server, About VCS basics, This chapter includes the following topics

Contents

Veritas Cluster Server Installation Guide Legal Notice Veritas Cluster Server Installation GuideSymantec Corporation Ellis Street Mountain View, CA Contacting Technical Support Technical SupportLicensing and registration Customer serviceDocumentation feedback Additional enterprise services Maintenance agreement resourcesContents Contents Chapter Configuring VCS clusters for data integrity 121 Chapter Adding and removing cluster nodesIndex 173 171Contents About VCS basics About Veritas Cluster ServerThis chapter includes the following topics About shared storage About multiple nodesExample of a four-node VCS cluster About LLT and GAB See About the LLT and GAB configuration files onAbout network channels for heartbeating About VCS seeding About preexisting network partitionsVeritas Installation Assessment Service About VCS featuresAbout VCS notifications About global clustersAbout I/O fencing About VCS optional componentsYou can add the following optional components to VCS About Symantec Product Authentication Service AT See Installing the Java Console on See Preparing to configure the clusters in secure mode onAbout Cluster Manager Java Console About Veritas Cluster Server Management ConsoleAbout VCS optional components Page Hardware requirements About planning to install VCS1lists the hardware requirements for a VCS cluster Hardware requirements for a VCS cluster Required disk spaceDescription Kernel Architecture Supported operating systemsRhel Required Linux RPMs for VCSSupported software Planning to install VCS Supported software Preparing to configure the clusters in secure mode About preparing to install VCS1depicts the flow of configuring VCS cluster in secure mode Workflow to configure VCS cluster in secure mode Tasks Preparatory tasks to configure a cluster in secure modeThis task See About Symantec Product Authentication Service AT on Installing the root broker for the security infrastructure# ./installer Venus # vssat showprpl --pdrtype root \ Venus # vssat showalltrustedcredsVenus # vssat showbrokerhash Creating encrypted files for the security infrastructureAddprpl command RootBroker # vssat createpkg \ For examplePerforming preinstallation tasks Task Reference Obtaining VCS license keysHttps//licensing.symantec.com You can use network switches instead of hubs Setting up the private networkPage See About installing and configuring VCS on Configuring SuSE network interfacesWhere ethX is the interface name For example Run the command# cd /etc/sysconfig # ifconfig -a# ifconfig eth0 Setting up inter-system communication# cd /etc/sysconfig/network Accept the default location of ~/.ssh/iddsa Setting up ssh on cluster systems# ssh-keygen -t dsa See About setting up disk-based I/O fencing on Setting up shared storage# chmod 755 ~/.ssh # exec /usr/bin/ssh-agent $SHELL # ssh-addSetting the Manpath variable Setting the Path variableFor the C Shell csh or tcsh, type Optimizing LLT media speed settings on private NICs Setting the kernel.panic tunableCase of a panic, the node will reboot after 10 seconds Mounting the product disc Performing automated pre-installation check# mount -o ro /dev/cdrom /mnt/cdrom # ./installvcs -precheck galaxy nebula VCS About installing and configuring VCSExample galaxy, nebula To configure Veritas Cluster Server you needExample vcscluster27 To configure Smtp email notification optional, you need To configure VCS clusters in secure mode optional, you needVar/tmp/privatedir/roothash To configure global clusters optional, you need To configure Snmp trap notification optional, you needOptional VCS RPMs Optional features of the installvcs program About the VCS installation programVRTSvcsmn Manual pages for VCS commands See About preparing to install VCS onAbout installvcs program command options Interacting with the installvcs programInstallvcs command usage takes the following form Optional action ReferenceInstallvcs system1 system2... options Nooptionalpkgs Option and Syntax DescriptionConfiguring VCS using configure option Installing VCS using installonly optionSee Configuring the basic cluster on Installing and configuring VCS 5.0 RU33lists the installation and the configuration tasks Overview of tasksStarting the software installation Start the installvcs program Specifying systems for installation# ./installvcs -rsh # cd /clusterserverSee Checking licensing information on the system on Licensing VCSEnter keys for additional product features Choosing VCS RPMs for installationChoosing to install VCS RPMs or configure VCS See Configuring VCS using configure option on Starting the software configurationConfiguring the basic cluster Specifying systems for configuration# ./installvcs -configure # cd /dvdrom/clusterserverPage Configuring the cluster in secure mode Symantecexample.com East.symantecexample.comRoot@east.symantecexample.com Root/roothashEnter the user’s name, password, and level of privileges Configuring Smtp email notificationAdding VCS users To add a user, enter y at the promptSee Configuring Snmp trap notification on See Configuring global clusters on Configuring Snmp trap notificationIf you do not want to add, answer n Verify and confirm the Smtp notification informationVerify and confirm the Snmp notification information Configuring global clustersSee Creating VCS configuration files on Installing VCS RPMsVerifying the NIC configuration Creating VCS configuration filesStarting VCS Completing the installationSet the Persistentname for all the NICs File description VCS node authentication broker Software requirements for the Java Console Installing the Java ConsoleHardware requirements for the Java Console See Software requirements for the Java Console onInstalling the Java Console on a Windows system Installing the Java Console on Linux for IBM PowerNavigate to the folder that contains the RPMs # cd /mnt/cdrom/distarch/clusterserver/rpmsInstalling VCS Simulator on Unix systems Installing VCS SimulatorInstalling VCS Simulator on Windows systems Software requirements for VCS SimulatorReviewing the installation See About verifying the VCS installation on Verifying the cluster after installationVerifying and updating licenses on the system Checking licensing information on the systemReplacing a VCS demo license with a permanent license Updating product licenses using vxlicinst# cd /opt/VRTS/bin # hastop -all -forceTo access the VCS documentation Accessing the VCS documentationStart VCS on each node # hastartAbout configuring VCS clusters for data integrity Configuring VCS clusters for data integrityAbout data disks About I/O fencing componentsAbout coordination points See About data disks on1illustrates the tasks involved to configure I/O fencing About setting up disk-based I/O fencingWorkflow to configure disk-based I/O fencing I/O fencing configuration files include Preparing to configure disk-based I/O fencing # fdisk -l Initializing disks as VxVM disksLibnamevidpid # vxddladm listsupport allChecking shared disks for I/O fencing Identifying disks to use as coordinator disksExample specifies the CDS format Testing the shared disks for SCSI-3 Verifying that the nodes have access to the same diskSee Testing the disks using vxfentsthdw utility on See Removing permissions for communication on Testing the disks using vxfentsthdw utility# /opt/VRTSvcs/vxfen/bin/vxfentsthdw # /opt/VRTSvcs/vxfen/bin/vxfentsthdw -n If you use rsh for communicationDev/sdr Setting up coordinator disk groups Setting up disk-based I/O fencing manually# vxdg init vxfencoorddg sdx sdy sdz # vxdg -g vxfencoorddg set coordinator=onFor raw device configuration Creating I/O fencing configuration filesDeport the coordinator disk group Make a backup copy of the main.cf file Modifying VCS configuration to use I/O fencingStop VCS on all nodes # hacf -verify /etc/VRTSvcs/conf/config Verifying I/O fencing configurationStart VCS # /etc/init.d/vxfen start# vxfenadm -d Removing permissions for communicationPage About the LLT and GAB configuration files About verifying the VCS installationGalaxy Nebula About the VCS configuration file main.cf Sample main.cf file for VCS clusters Page Sample main.cf file for global clusters ClusterAddress = Wac requires gcoip Gcoip requires csgnicApplication wac IP gcoip NIC csgnic Verify the content of the configuration files Verifying the LLT, GAB, and VCS configuration filesSee Setting the Path variable on Verifying LLT, GAB, and cluster operationSee Verifying the cluster on Verifying LLTOutput on galaxy resembles Output on nebula resemblesEth1 UP Output resembles Verifying GABVerifying the cluster Verifying the cluster nodes Current Eth1 UP eth2 UP Adding a node to a cluster About adding and removing nodesSee Adding a license key on Setting up the hardwarePreparing for a manual installation when adding a node See Mounting the product disc on Installing VCS RPMs for a manual installationChecking licensing information on the system Adding a license keySLES10/ppc64, required Rpms See Configuring LLT and GAB on Setting up the node to run in secure modeSee Configuring the authentication broker on node saturn on See Setting up VCS related security configuration onConfiguring the authentication broker on node saturn Setting up VCS related security configuration Configuring LLT and GAB# /sbin/lltconfig -c On the new system, run the commandIf the file on one of the existing nodes resembles Adding the node to the existing cluster To verify GAB On the new node, run the commandAdd the new system to the cluster Starting VCS and verifying the cluster Removing a node from a clusterStop VCS on the new node Start VCS on the new nodeVerifying the status of nodes and service groups Check the status of the systems and the service groups Deleting the departing node from VCS configuration# hastatus -summary # hagrp -dep # hagrp -switch grp3 -to nebula# haconf -makerw # hagrp -unlink grp4 grp1 Check the status Save the configuration, making it read onlyDelete the node from the cluster # hagrp -delete grp4Removing security credentials from the leaving node Modifying configuration files on each remaining nodeTo determine the RPMs to remove, enter Stop GAB and LLT# /etc/init.d/gab stop # /etc/init.d/llt stop # rpm -qa grep Vrts# rm /etc/llttab # rm /etc/gabtab # rm /etc/llthosts Remove the LLT and GAB configuration filesCreating a single-node cluster using the installer program About installing VCS on a single nodeStarting the installer for the single node cluster Preparing for a single node installationTasks to create a single-node cluster using the installer See Starting the software installation onCreating a single-node cluster manually Installing the VCS software manually on a single nodeSee Licensing VCS on Set the path variableModifying the startup files Renaming the LLT and GAB startup filesVerifying single-node operation # hastart -onenodeAdding a node to a single-node cluster Installing VxVM or VxFS if necessary Setting up a node to join the single-node clusterSee Setting up shared storage on Configuring the shared storageDisplay the service groups currently configured Bringing up the existing nodeFreeze the service groups Configuring LLTStop VCS on Node a Rename the GAB and LLT startup files so they can be usedSetting up /etc/llttab Setting up /etc/llthostsLLT directives See LLT directives onLLT directives Additional considerations for LLTDirective Description Reconfiguring VCS on the existing node Configuring GAB when adding a node to a single node clusterReconfigure VCS on the existing nodes Starting LLT and GABVerifying configuration on both nodes Implement the new two-node configuration Unfreeze the service groupsStart the VCS on Node B Verify that VCS is up on both nodesPage Preparing to uninstall VCS About the uninstallvcs programSee About adding and removing nodes on # cd /opt/VRTS/install # ./uninstallvcs Uninstalling VCS 5.0 RU3Removing VCS 5.0 RU3 RPMs Running uninstallvcs from the VCS 5.0 RU3 disc Uninstallvcs program is not available in /opt/VRTS/install When to use LLT over UDP Using the UDP layer for LLTConfiguring LLT over UDP Following checklist is to configure LLT over UDPSee Sample configuration links crossing IP routers on Link command in the /etc/llttab fileBroadcast address in the /etc/llttab file See Broadcast address in the /etc/llttab file onTable A-2describes the fields of the set-addr command Set-addr command in the /etc/llttab fileSelecting UDP ports Configuring the netmask for LLT# setparms ipaddress Sample configuration direct-attached links Configuring the broadcast address for LLTFor second network interface # cat /etc/llttabFile for Node 1 resembles UDPFigure A-2 Sample configuration links crossing IP routers/etc/llttab file on Node 0 resembles Performing automated VCS installationsExample response file Syntax in the response fileOr, in the case of an integer value Or, in the case of a listTable A-3 Response file variables Variable Description Response file variable definitions$CPICFGOPTLICENSE $CPICFGOPTPKGPATH $CPICFGKEYS Table A-3 $CPICFGOPTUNINSTALL See Installing and configuring VCS 5.0 RU3 on# ./installvcs -responsefile /tmp/installvcs-uui.response Index GAB RAM VCS