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Thefollowing proceduredetailshowto setup acontrolprocessformultiplenodesin an OracleRACLinux clusterto run allTimeMachineoperationson each nodesimultaneously. Afterfollowing thesestepsauserwillbeableto enableordisabletheirvirtualclock on each machinewith onecommand.

Step1:Enablershandthexinetddaemonandconfigureitto restartautomatically during eachsystemreboot.

Ifxinetdisnotenabled on yoursystem, followtheappropriatemethod listed belowforyouroperating systemtype.

Notethatwhen anodeisrebooted, thexinetdservicemustberestarted.

Enabling xinetdandrshonRedHat4

To enablexinetdon Red Hatversion 4, performthefollowing steps.

1.

Prepare the Linux host to provide rsh capability:a.

Check that the rsh daemon is installed, using:

chkconfig --list | grep rsh

or

rpm -qa | grep rsh-server

b.

If the rsh daemon does not exist, install the rsh server RPM package, (rsh-server-0.17-

17.i386.rpm).

c. Edit the following configuration files:

/etc/xinetd.d/rexec with DISABLE = NO

/etc/xinetd.d/rsh with DISABLE = NO

/etc/xinetd.d/rlogin with DISABLE = NO

2.

If the /etc/securetty file exists, add the following lines to the end of the file.

rsh

rexec

rlogin

3.

Update the following PAM-related files to allow remote logins from other systems:

a. Edit the /etc/pam.d/rlogin file and comment out the following line by inserting a pound

sign (#):

# auth required /lib/security/pam_securetty.so

b. Edit the /etc/pam.d/rsh file and change the following line:

auth required /lib/security/pam_rhosts_auth.so

to

auth sufficient /lib/security/pam_rhosts_auth.so

4. Restart the xinetd service using /etc/rc.d/init.d/xinetd restart.

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Step2:UserIDsonremotenodes

On each remotenode, thesystemadministratormustsetup auserID, otherthan arootID, foreach useron each remotenodewho willbeexecuting serialorparallel. Both theusernameand userIDmustbethesameon allnodes. Also, theusermustbeamemberofthesamenamed group on thehomenodeand theremotenodes.

Example:[oracle@spb10 ~]$ id

uid=500(oracle)gid=501(dba)groups=501(dba)

Step3:Userauthorization

Each nodeneedsto besetup such thateach userid isauthorized to accessthatnodeorremotelink fromtheinitiating homenode. Edittheusers.rhostsfileon each nodeto specify thisusersauthorization to run commandsfromothernodesin thecluster.

Exampleoffile/home/oracle/.rhosts(thisfilecanandshouldbethesameoneachnode. Inthisexampletherearetwo node, spb10 &spb15)

spb10-intoraclespb15-intoraclespb10 oraclespb15 oracle

Step4:Testthesetup

Afterfollowing theabovestepson each nodein theclusterformthecommand lineon onenodetestthesetup using rsh to runacommand on theothernode:

Example:(Thisexamplewasran frommachinespb10 calling outto machinespb15)[oracle@spb10 ~]$ rshspb15 -loraclelsconnectto address15.170.177.15:ConnectionrefusedTrying krb4 rsh...connectto address15.170.177.15:Connectionrefusedtrying normalrsh(/usr/bin/rsh)file1.txtfoo.barhello.world

[oracle@spb10 ~]$

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Step5:Creating thecontrolscript

Next create an editable script fi le that wi ll allow all the user s Time Machine commands tobeexecutedoneachnode.Thefollowing isanexampleofa scriptthatwilldeterminewhichmachineitisbeing calledfrom, executethepassed-incommandontheremotenodevia remote-shell(rsh)thenimmediately executethesamecommandonthelocalnode.

# CLUSTERTM# ThisLinux shellscriptfiletakesin theentirecommand linestring "$@"and passesitto thedefined RSH# hostsand then executesthesame# command on thelocalhost. Thisfilemustbeexecuted fromthesamenetwork accounton thelocalhostason theremotehost/s.## Asthiswasdesigned forclustermanagementthisfileneedsto residein theusershomedirectory on allmachines## Exampleofuse: [oracle@spb15 ~]$ clusterm tmuser -a -u 500 -x 022812552010 -f## Used asabovetheremotemachineand localhostwillhaveavirtualclock foruseroraclesetto 12:55, Feb 28th 2010.

case$HOSTNAMEinspb10.usa.hp.com)rshspb15.usa.hp.com-loracle$@;echo ------------Nowexecuting commandlocally------------------------$@;;

spb15.usa.hp.com)rshspb10.usa.hp.com-loracle$@;echo ------------Nowexecuting commandlocally------------------------$@;;

esac