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Installing CRS and RAC

Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.


Once the DBA can ping and do NSLOOKUP on various addresses, the system is ready to install CRS and RAC as long as the shared disks are configured and ready!

At the end of the RAC installation, the user will be prompted to run root.sh.  When root.sh runs, it automatically invokes the VIPCA.  When this happens, the following steps should be followed:

1. The VIPCA welcome page will be displayed first.  Review the information on the VIPCA Welcome page.  Click Next, and the VIPCA will display the Public Network Interfaces page.  Alsop see using X|VIPCA to configure Virtual IP's.

2. On the Public Network Interfaces page, determine the network interface cards (NICs) to which the public VIP addresses should be assigned.  Click Next, and the VIPCA will display the IP Address page.

3. On the IP Address page, an unused or unassigned public virtual IP address should be assigned for each node displayed and click Next. The VIPCA will display a Summary page. Review the information on the summary page and click Finish. A progress dialog will appear while the VIPCA configures the virtual IP addresses for the network interfaces that were specified. The VIPCA creates and starts the VIPs, GSD, and the Oracle notification Service (ONS) node applications. When the configuration is complete, click OK and the VIPCA will show the session results. Review the information displayed on the Configuration Results page, and click Exit to exit the VIPCA. 

4. Repeat the root.sh procedure on all nodes that are part of this installation. 

5. The VIPCA will not run again on the remote node because the remote node is already configured.

If the VIP's are not set up correctly, the VIPCA will fail with the error CRS-215 Could not start resource for the VIP resource and any resources that depend on the CRS resource such as GSD and ONS.

After VIPCA has been successfully run, the VIP addresses will be visible in IFCONFIG or NETSTAT-IN on HP-UX.  The following is an example of a VIP IFCONFIG output:

 eth0:1    Link encap:Ethernet  HWaddr 00:91:26:BD:D6:9E  
          inet addr:172.1.137.27  Bcast:172.1.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11 Base address:0x9000 

The information is also available via CRS.  Go to the crs_home/bin directory or its equivalent on the current system and run the command CRS_STAT.  The following is an example of the VIP resource information from CRS_STAT:

            NAME=ora.aultlinux1.vip
            TYPE=application
            TARGET=ONLINE
            STATE=ONLINE on aultlinux1

            NAME=ora.aultlinux2.vip
            TYPE=application
            TARGET=ONLINE
            STATE=ONLINE on aultlinux2

This output shows that both of the aultlinux cluster VIP's are online and are assigned to their proper nodes.  In the event of a failover scenario, one or more VIP's will be moved to another node.  This VIP movement is automatically managed by the CRS processes.

When there is a need to change VIP's to a different address, remove the node level applications and recreate them using SRVCTL, for example:

srvctl stop nodeapps
srvctl remove nodeapps 
srvctl add nodeapps

What If There are Issues with VIP?

If there are issues with the VIP setup, review the following files or use the following commands:

* IFCONFIG-A for output from each node

* NSLOOKUP <Virtual Host Name> for each virtual host name

* /etc/hosts file from each node

* output of $ora_crs_home/bin/crs_stat

* output of SRVCTL START NODEAPPS -N <node name> on the node having the issue

In light of the information presented in previous sections, review the output of the above files and commands and correct as needed.

 


 

 
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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