{"id":1833,"date":"2010-07-08T06:14:31","date_gmt":"2010-07-08T10:14:31","guid":{"rendered":"http:\/\/onlineappsdba.com\/index.php\/2010\/07\/08\/whole-server-migration\/"},"modified":"2011-02-23T09:13:33","modified_gmt":"2011-02-23T13:13:33","slug":"whole-server-migration","status":"publish","type":"post","link":"https:\/\/onlineappsdba.com\/index.php\/2010\/07\/08\/whole-server-migration\/","title":{"rendered":"Whole Server Migration"},"content":{"rendered":"

WSM is the process of moving the entire server instance from one physical machine to another upon failure or scheduled maintenance. All the services being hosted by that particular instance will also be migrated along with it to another healthy server.<\/p>\n

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Machine configuration for WSM<\/u><\/strong><\/p>\n

1.<\/strong> Identify two machines on the same sub net for running Server Migration.<\/p>\n

2.<\/strong> Create a local directory for the user. Ensure same directory structure on both the machines.<\/p>\n

3.<\/strong> User need to have access to some shared disk between these two boxes (e.g. NFS).<\/p>\n

4.<\/strong> Obtain Floating IP addresses that can be shared between the two machines.<\/p>\n

5.<\/strong> Establish trust between Machines (SSH\/RSH). SSH version should be of same version and needs to be available on both the boxes. Use following commands for that –<\/p>\n

cd .ssh<\/p>\n

ssh -keygen -t rsa<\/p>\n

cat id_rsa.pub >> authorized_keys<\/p>\n

Copy authorized_keys dir to .ssh directory of another machine.<\/p>\n

6. <\/strong>Get Super-User privileges to add\/remove floating IPs.<\/p>\n

7. <\/strong>Note the interface name and Netmask of each machine<\/p>\n

8.<\/strong> Install WebLogic server on both the machines in the user local home directory.<\/p>\n

9.<\/strong> Modify wlscontrol.sh<\/strong> under WL_HOME\/common\/bin directory to add interface and NetMask.<\/p>\n

10.<\/strong> Change Interface=${WLS_Interface:-“”} to Interface=en0
\nand NetMask=$WLS_NetMask:-“”} to NetMask=255.255.255.0<\/p>\n

11.<\/strong> Modify wlsifconfig.sh<\/strong> to hard code value of Sudo. For e.g. SUDO=\/usr\/bin\/sudo<\/p>\n

12.<\/strong> Copy wlscontrol.sh<\/strong> and wlsifconfig.sh<\/strong> to \/usr\/bin (these two files need to be in system path and \/usr\/bin is always in system path).<\/p>\n

<\/p>\n

Configuring Whole Server Migration<\/strong><\/p>\n

1. Creating clustered domain<\/strong><\/font><\/p>\n

Create a multi machine clustered domain with following configuration:<\/p>\n

1. Admin server<\/p>\n

2. Two managed servers (here ms1 and ms2) with floating IP addresses assigned to them.<\/p>\n

3. A cluster with managed servers assigned to it.<\/p>\n

4. Two machines (machine1 and machine2). Assign IP address of one of the machines (physical machine) to Node manager listen address<\/em> of machine1 and IP address of other machine as Node manager listen address<\/em> of machine2.<\/p>\n

5. Assign Admin server and managed server1 to machine1 and managed server2 to machine2.<\/p>\n

2. Packing and unpacking of domain <\/strong><\/font><\/p>\n

Now pack this domain and unpack it under same directory structure in second machine.<\/p>\n

Execute Following command under $WL_HOME\/common\/bin dir to pack this domain.<\/p>\n

pack.sh \u2013managed=true \u2013domain=<domain name> -template=<domain_name.jar> -template_name=\u201d<description>\u201d<\/em><\/p>\n

\u00a0Now copy the jar file under some location in another machine where we have to unpack it. For unpacking execute following command under $WL_HOME\/common\/bin<\/p>\n

unpack.sh \u2013domain=<domain name> -template=<jar file name><\/em><\/p>\n

For more details on packing and unpacking of domain, please click here<\/a><\/p>\n

3. Configuring Automatic Migration<\/strong><\/font><\/p>\n

After you are done with creating domain, and packing\/unpacking of domain, run admin server as well as node managers in both machines. Open admin console and configure for automatic server migration. The steps are as follows:<\/p>\n