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Oracle® Application Server Installation Guide
10g Release 2 (10.1.2) for AIX 5L Based Systems (64-Bit) B25201-01 |
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Oracle® Application Server Installation Guide
10g Release 2 (10.1.2) for AIX 5L Based Systems (64-Bit) B25201-01 |
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This chapter describes how to install Oracle Application Server in OracleAS Disaster Recovery configurations. OracleAS Disaster Recovery is one of the high availability environments supported by Oracle Application Server.
Contents of this chapter:
Section 13.2, "Setting up the OracleAS Disaster Recovery Environment"
Section 13.3, "Installing Oracle Application Server in an OracleAS Disaster Recovery Environment"
Section 13.5, "Patching OracleAS Guard Release 10.1.2.0.0 with Release 10.1.2.0.2"
Use the OracleAS Disaster Recovery environment when you want to have two physically separate sites in your environment. One site is the production site, and the other site is the standby site. The production site is active, while the standby site is passive; the standby site becomes active when the production site goes down.
OracleAS OracleAS Disaster Recovery supports a number of basic topologies for the configuration of the Infrastructure and middle tier on production and standby sites. OracleAS Disaster Recovery supports these basic topologies:
Symmetrical topologies -- strict mirror of the production site with collocated Oracle Identity Management and OracleAS Metadata Repository Infrastructure
Asymmetrical topologies -- simple asymmetric standby topology with collocated Oracle Identity Management and OracleAS Metadata Repository Infrastructure
Separate OracleAS Metadata Repository for OracleAS Portal with collocated Oracle Identity Management and OracleAS Metadata Repository Infrastructure (the Departmental Topology)
Distributed Application OracleAS metadata Repositories with Non collocated Oracle Identity Management and OracleAS Metadata Repository Infrastructure
In a symmetric topology, each node in the standby site corresponds to a node in the production site. This includes the nodes running both OracleAS Infrastructure and middle tiers. In an asymmetric topology, the number of instances required on the standby site are fewer than the number on the production site and the number of instances required on the standby site must be the minimum set of instances required to run your site in the event of a switchover or failover operation.
As a small variation to this environment, you can set up the OracleAS Infrastructure on the production site in an OracleAS Cold Failover Cluster environment. Refer to Section 13.2.4, "If You Want to Use OracleAS Cold Failover Cluster on the Production Site" for details.
For these supported topologies, OracleAS Guard will be installed in every Oracle home on every system that is part of your production and standby topology configured for the OracleAS Disaster Recovery solution.
OracleAS Guard can be installed as a standalone install kit located on OracleAS Utility media #2. Refer to Section 13.4, "Installing the OracleAS 10g (10.1.2.0.2) Standalone Install of OracleAS Guard into Oracle Homes" for more information about when this standalone kit should be installed.
Figure 13-1 shows an example symmetric OracleAS Disaster Recovery environment. Each site has two nodes running middle tiers and a node running OracleAS Infrastructure.
For OracleAS Disaster Recovery to work, data between the production and standby sites must be synchronized so that failover can happen very quickly. Configuration changes done at the production site must be synchronized with the standby site.
You need to synchronize two types of data. The synchronization method depends on the type of data:
Use Oracle Data Guard to synchronize data in the OracleAS Metadata Repository databases on the production and standby sites. You can configure Oracle Data Guard to perform the synchronization.
Use the backup and recovery scripts to synchronize data outside of the database (such as data stored in configuration files).
Refer to Oracle Application Server High Availability Guide for details on how to use Oracle Data Guard and the backup and recovery scripts.
Figure 13-1 OracleAS Disaster Recovery Environment
Before you can install Oracle Application Server in an OracleAS Disaster Recovery environment, you have to perform these steps:
Section 13.2.1, "Ensure Nodes Are Identical at the Operating System Level"
Section 13.2.3, "Set Up Identical Hostnames on Both Production and Standby Sites"
Section 13.2.4, "If You Want to Use OracleAS Cold Failover Cluster on the Production Site"
Ensure that the nodes are identical with respect to the following items:
The nodes are running the same version of the operating system.
The nodes have the same operating system patches and packages.
You can install Oracle Application Server in the same directory path on all nodes.
The same component must use the same port number on the production and standby sites. For example, if Oracle HTTP Server is using port 80 on the production site, it must also use port 80 on the standby site. To ensure this is the case, create a staticports.ini file for use during installation. This file enables you to specify port numbers for each component. Refer to Section 4.5.3, "Using Custom Port Numbers (the "Static Ports" Feature)" for details.
The names of the corresponding nodes on the production and standby sites must be identical, so that when you synchronize data between the sites, you do not have to edit the data to fix the hostnames.
For the Infrastructure Nodes
For the node running the infrastructure, set up a virtual name. To do this, specify an alias for the node in the /etc/hosts file.
For example, on the infrastructure node on the production site, the following line in the hosts file sets the alias to asinfra:
138.1.2.111 prodinfra asinfra
On the standby site, the following line sets the node's alias to asinfra.
213.2.2.110 standbyinfra asinfra
When you install OracleAS Infrastructure on the production and standby sites, you specify this alias (asinfra) in the Specify Virtual Hostname screen. The configuration data will then contain this alias for the infrastructure nodes.
For the Middle-Tier Nodes
For the nodes running the middle tiers, you cannot set up aliases like you did for the infrastructure nodes because the installer does not display the Specify Virtual Hostname screen for middle-tier installations. When installing middle tiers, the installer determines the hostname automatically by calling the gethostname() function. You want to be sure that for each middle-tier node on the production site, the corresponding node on the standby site returns the same hostname.
To do this, set up a local, or internal, hostname, which could be different from the public, or external, hostname. You can change the names of the nodes on the standby site to match the names of the corresponding nodes on the production site, or you can change the names of the nodes on both production and standby sites to be the same. This depends on other applications that you might be running on the nodes, and whether changing the node name will affect those applications.
On the nodes whose local names you want to change, reconfigure the node so that the hostname command returns the new local hostname.
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Note: The procedure to change the hostname of a system differs between different operating systems. Contact the system administrator of your system to perform this step. Note also that changing the hostname of a system will affect installed software that has a dependency on the previous hostname. Consider the impact of this before changing the hostname. |
Enable the other nodes in the OracleAS Disaster Recovery environment to be able to resolve the node using the new local hostname. You can do this in one of two ways:
Method 1: Set up separate internal DNS servers for the production and standby sites. This configuration allows nodes on each site (production or standby) to resolve hostnames within the site. Before the internal DNS servers are the corporate, or external, DNS servers. The internal DNS servers forward non-authoritative requests to the external DNS servers. The external DNS servers do not know about the existence of the internal DNS servers. Refer to Figure 13-2.
Method 1 Details
Make sure the external DNS names are defined in the external DNS zone. Example:
prodmid1.us.oracle.com IN A 138.1.2.333 prodmid2.us.oracle.com IN A 138.1.2.444 prodinf.us.oracle.com IN A 138.1.2.111 standbymid1.us.oracle.com IN A 213.2.2.330 standbymid2.us.oracle.com IN A 213.2.2.331 standbyinf.us.oracle.com IN A 213.2.2.110
At the production site, create a new zone at the production site using a domain name different from your external domain name. To do this, populate the zone data files with entries for each node in the OracleAS Disaster Recovery environment.
For the infrastructure node, use the virtual name or alias.
For the middle-tier nodes, use the node name (the value in /etc/niminfo).
The following example uses "asha" as the domain name for the new zone.
asmid1.asha IN A 138.1.2.333 asmid2.asha IN A 138.1.2.444 asinfra.asha IN A 138.1.2.111
Do the same for the standby site. Use the same domain name that you used for the production site.
asmid1.asha IN A 213.2.2.330 asmid1.asha IN A 213.2.2.331 asinfra.asha IN A 213.2.2.110
Configure the DNS resolver to point to the internal DNS servers instead of the external DNS server.
In the /etc/resolv.conf file for each node on the production site, replace the existing name server IP address with the IP address of the internal DNS server for the production site.
Do the same for the nodes on the standby site, but use the IP address of the internal DNS server for the standby site.
Create a separate entry for Oracle Data Guard in the internal DNS servers. This entry is used by Oracle Data Guard to ship redo data to the database on the standby site.
In the next example, the "remote_infra" entry points to the infrastructure node on the standby site. This name is used by the TNS entries on both the production and standby sites so that if a switchover occurs, the entry does not have to be changed.
Figure 13-3 Entry for Oracle Data Guard in the Internal DNS Servers
On the production site, the DNS entries look like this:
asmid1.asha IN A 138.1.2.333 asmid2.asha IN A 138.1.2.444 asinfra.asha IN A 138.1.2.111 remote_infra.asha IN A 213.2.2.110
On the standby site, the DNS entries look like this:
asmid1.asha IN A 213.2.2.330 asmid2.asha IN A 213.2.2.331 asinfra.asha IN A 213.2.2.110 remote_infra.asha IN A 138.1.2.111
Method 2: Edit the /etc/hosts file on each node on both sites. This method does not involve configuring DNS servers, but you have to maintain the hosts file on each node in the OracleAS Disaster Recovery environment. For example, if an IP address changes, you have to update the files on all the nodes, and restart the nodes.
Method 2 Details
On each node on the production site, include these lines in the /etc/hosts file. The IP addresses resolve to nodes on the production site.
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Note: In thehosts file, be sure that the line that identifies the current node comes immediately after the localhost definition (the line with the 127.0.0.1 address).
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127.0.0.1 localhost 138.1.2.333 asmid1.oracle.com asmid1 138.1.2.444 asmid2.oracle.com asmid2 138.1.2.111 asinfra.oracle.com asinfra
On each node on the standby site, include these lines in the hosts file. The IP addresses resolve to nodes on the standby site.
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Note: In thehosts file, be sure that the line that identifies the current node comes immediately after the localhost definition (the line with the 127.0.0.1 address).
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127.0.0.1 localhost 213.2.2.330 asmid1.oracle.com asmid1 213.2.2.331 asmid2.oracle.com asmid2 213.2.2.110 asinfra.oracle.com asinfra
Ensure that the "hosts=" line in the /etc/netsvc.conf file has "local" as the first item:
hosts=local,bind
The entry specifies the ordering of the name resolution. If another method is listed first, then the node will use the other method to resolve the hostname.
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Note: Restart the nodes after editing these files. |
Verifying that the Nodes Resolve the Hostnames Correctly
After making the changes and restarting the nodes, check that the nodes resolve the hostnames properly by running the following commands:
On the middle-tier nodes on both sites, run the hostname command. This should return the internal hostname. For example, the command should return "asmid1" if you run it on prodmid1 and standbymid1.
prompt> hostname
asmid1
On each node, ping the other nodes in the environment using the internal hostname as well as the external hostname. The command should be successful. For example, from the first midtier node, prodmid1, run the following commands:
prompt> ping the production infrastructure node PING prodinfra: 56 data byes 64 bytes from prodinfra.oracle.com (138.1.2.111): icmp_seq=0. time=0. ms ^C prompt> ping the production infrastructure node PING iasinfra: 56 data byes 64 bytes from iasinfra.oracle.com (138.1.2.111): icmp_seq=0. time=0. ms ^C prompt> ping the second production midtier node PING iasmid2: 56 data byes 64 bytes from iasmid2.oracle.com (138.1.2.444): icmp_seq=0. time=0. ms ^C prompt> ping the second production midtier node PING prodmid2: 56 data byes 64 bytes from prodmid2.oracle.com (138.1.2.444): icmp_seq=0. time=0. ms ^C prompt> ping the first standby midtier node PING standbymid1: 56 data byes 64 bytes from standbymid1.oracle.com (213.2.2.330): icmp_seq=0. time=0. ms ^C
On the production site of a OracleAS Disaster Recovery system, you can set up the OracleAS Infrastructure to run in a OracleAS Cold Failover Cluster configuration. In this case, you have two nodes in a hardware cluster, and you install the OracleAS Infrastructure on a shared disk. Refer to Chapter 11, "Installing in High Availability Environments: OracleAS Cold Failover Cluster" for details.
Figure 13-4 Infrastructure in an OracleAS Cold Failover Cluster Configuration
To set up OracleAS Cold Failover Cluster in this environment, use the virtual IP address (instead of the physical IP address) for asinfra.asha on the production site. The following example assumes 138.1.2.120 is the virtual IP address.
asmid1.asha IN A 138.1.2.333
asmid2.asha IN A 138.1.2.444
asinfra.asha IN A 138.1.2.120 this is a virtual IP address
remote_infra.asha IN A 213.2.2.110
On the standby site, you still use the physical IP address for asinfra.asha, but the remote_infra.asha uses the virtual IP address.
asmid1.asha IN A 213.2.2.330 asmid2.asha IN A 213.2.2.331 asinfra.asha IN A 213.2.2.110 physical IP address remote_infra.asha IN A 138.1.2.120 virtual IP address
Install Oracle Application Server as follows:
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Note: For all of the installations, be sure to use staticports.ini to specify port numbers for the components. Refer to Section 13.2.2, "Set Up staticports.ini File". |
Install OracleAS Infrastructure on the production site.
Install OracleAS Infrastructure on the standby site.
Start the OracleAS Infrastructure in each site before installing the middle tiers for that site.
Install middle tiers on the production site.
Install middle tiers on the standby site.
You must install the Oracle Identity Management and the OracleAS Metadata Repository components of OracleAS Infrastructure on the same node. You cannot distribute the components over multiple nodes.
The installation steps are similar to that for OracleAS Cold Failover Cluster. Refer to Section 11.3, "Installing an OracleAS Cold Failover Cluster (Infrastructure) Configuration" for the screen sequence. Note the following points:
Select Configuration Options screen: Select High Availability and Replication. Refer to Table 11-2, step 9.
Specify Virtual Hostname screen: Enter an alias as the virtual address (for example, asinfra.oracle.com). Refer to Table 11-2, step 13.
You can install any type of middle tier that you like:
For installing J2EE and Web Cache, see Section 7.9, "Installing J2EE and Web Cache in a Database-Based Farm Repository and with Oracle Identity Management Access".
For installing Portal and Wireless or Business Intelligence and Forms, see Section 7.13, "Installing Portal and Wireless or Business Intelligence and Forms".
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Note: When the installer prompts you to register with Oracle Internet Directory, and asks you for the Oracle Internet Directory hostname, enter the alias of the node running OracleAS Infrastructure (for example, asinfra.oracle.com). |
OracleAS 10g (10.1.2.0.2) standalone install of OracleAS Guard is located on Utilities Disk 2. This standalone install of OracleAS Guard can be installed in the following environments:
In its own home in the case when you are cloning an instance or topology to a new standby system (see the section on standby site cloning in Oracle Application Server High Availability Guide for more information).
Oracle database server home for an OracleAS Metadata Repository configuration created using OracleAS Metadata Repository Creation Assistant.
OracleAS Disaster Recovery full site upgrade from OracleAS 10g (9.0.4) to OracleAS 10g (10.1.2.0.2) (see the chapter on OracleAS Disaster Recovery site upgrade procedure in Oracle Application Server High Availability Guide for more information).
OracleAS Guard patch upgrade from OracleAS 10g (10.1.2.0.0) to OracleAS 10g (10.1.2.0.2) (see Section 13.5, "Patching OracleAS Guard Release 10.1.2.0.0 with Release 10.1.2.0.2" for more information).
If this is an upgrade installation of OracleAS Guard, make a copy of your dsa.conf configuration file to save your current settings for your OracleAS Guard environment. After running the OracleAS 10g (10.1.2.0.2) standalone install kit of OracleAS Guard, you can restore your saved dsa.conf configuration file with your settings to continue using the same settings for the upgraded OracleAS Guard environment.
To run the OracleAS 10g (10.1.2.0.2) standalone install kit of OracleAS Guard, run the kit in the following directory path:
/Disk2/asg/install/runInstaller
Choose the type of install that you want. Choose Typical for most installations. Choose Custom or Reinstall for upgrading from an older release of OracleAS Guard to the current release.
Enter the ias_admin account password to continue the installation.
If you already have an OracleAS Disaster Recovery environment set up using OracleAS Guard Release 10.1.2.0.0, you can patch OracleAS Guard in your environment to take advantage of new features and support for the topologies described in Section 13.1, "OracleAS Disaster Recovery: Introduction". To patch your OracleAS Disaster Recovery environment, follow these basic steps:
Stop the OracleAS Guard server in all OracleAS 10.1.2.0.0 Oracle homes on both production and standby sites using the following opmnctl command:
ORACLE_HOME/opmn/bin/opmnctl stopall
Install the OracleAS 10g (10.1.2.0.2) standalone install of OracleAS Guard into each Oracle home on the production and standby sites.
If multiple Oracle homes exist on the same system, ensure that different ports are configured for each of the OracleAS Guard servers in this configuration file.
Because this is an upgrade installation of OracleAS Guard, make a copy of your dsa.conf configuration file to save your current settings for your OracleAS Guard environment. After running the OracleAS 10g (10.1.2.0.2) standalone install kit of OracleAS Guard, you can restore your saved dsa.conf configuration file with your settings to continue using the same settings for the upgraded OracleAS Guard environment.
ORACLE_HOME/dsa/dsa.conf
Start the OracleAS Guard server in all OracleAS 10.1.2.0.0 Oracle homes on both production and standby sites using the following opmnctl command:
ORACLE_HOME/opmn/bin/opmnctl startallORACLE_HOME/opmn/bin/opmnctl startproc ias-component=DSA
