Configuring HACMP Application Servers

To configure an application server on any cluster node:
1.Log in to a URL where WebSMIT is installed. The browser window displays the top-level WebSMIT screen.
2.In WebSMIT, select Extended Configuration > Extended Resource Configuration > HACMP Extended Resources Configuration > Configure HACMP Applications > Configure HACMP Application Servers > Add an Application Server and press Continue.
WebSMIT displays the Add an Application Server panel.
3.Enter field values as follows:
Server Name
Enter an ASCII text string that identifies the server. You will use this name to refer to the application server when you define resources during node configuration. The server name can include alphabetic and numeric characters and underscores. Use no more than 64 characters.
Start Script
Enter the pathname of the script (followed by arguments) called by the cluster event scripts to start the application server. (Maximum 256 characters.) This script must be in the same location on each cluster node that might start the server. The contents of the script, however, may differ.
Stop Script
Enter the pathname of the script called by the cluster event scripts to stop the server. (Maximum 256 characters.) This script must be in the same location on each cluster node that may start the server. The contents of the script, however, may differ.
4.Press Continue to add this information to the HACMP Configuration Database on the local node.
5.Add the application start, stop and notification scripts to every node in the cluster.
Verifying Application Servers
Make sure that the application start, stop and notification scripts exist and are executable on every node in the cluster. Use the cllsserv command.
For example:
ppstest2:~ # /usr/es/sbin/cluster/utilities/cllsserv
app_test2_primary /usr/local/app_start /usr/local/app_stop
ppstest2:~ # ls -l /usr/local/app_start
-rwxr--r-- 1 root root 169 May 10 22:54 /usr/local/app_start
Configuring Application Monitors
Once you configured application servers, HACMP for Linux lets you have application monitors that will check the health of the running application process, or check for the successful start of the application.
To configure application monitors:
1.Log in to a URL where WebSMIT is installed. The browser window displays the top-level WebSMIT screen.
2.In WebSMIT, select Extended Configuration > Extended Resource Configuration > HACMP Extended Resources Configuration > Configure HACMP Applications > Configure HACMP Application Monitoring and press Continue. A selector screen appears for Configure Process Application Monitoring and Configure Custom Application Monitoring.
3.Select the type of monitoring you want and press Continue.
4.Select the application server to which you want to add a monitor.
5.Fill in the field values and press Continue.
For additional reference information on application monitoring, its types, modes, and other information, see the HACMP for AIX Administration Guide.
Including Resources into Resource Groups
Once you configure resources to HACMP, you include them in resource groups so that HACMP can manage them as a single set. For example, if an application depends on the service IP label, you can add it to a single resource group.
HACMP manages the resources in a resource group by bringing the resource groups online and offline on their home node(s), or moving them to other nodes, if necessary for recovery.
Note:For detailed instructions on resource groups, see the HACMP for AIX Administration Guide. This guide contains descriptions of procedures in HACMP SMIT, and the options are identical to those used in WebSMIT in HACMP for Linux.
Resource Group Management: Overview
In the Extended Configuration > Extended Resource Configuration > HACMP Extended Resource Group Configuration WebSMIT screen, you can:
•Add a resource group.
•Change/Show a resource group. The system displays all previously defined resource groups. After selecting a particular resource group, you can view and change the group name, node relationship, and participating nodes (nodelist). You can also change the group’s startup, fallover and fallback policies.
•Remove a resource group.
•Change/Show resources for a resource group. Add resources, such as a service IP label for the application, or an application server, to a resource group. HACMP always activates and brings offline these resources on a particular node as a single set. If you want HACMP to activate one set of resources on one node and another set of resources on another node, create separate resource groups for each set.
•Show all resources by node for a resource group.
HACMP for Linux does not allow to change resources dynamically, that is, when HACMP cluster services are running on the nodes. To change the previously added resources, stop the cluster services.
Adding Resources to a Resource Group
To include resources into a resource group:
1.Log in to a URL where WebSMIT is installed. The browser window displays the top-level WebSMIT screen.
2.In WebSMIT, select Extended Configuration > Extended Resource Configuration > HACMP Extended Resources Configuration > Change/Show All Resources and Attributes for a Resource Group and press Continue.
3.Fill in the field values and press Continue. HACMP adds the resources.
For additional information on adding or changing resources in resource groups, and for information on other resource group management tasks, see the Administration Guide.
Synchronizing the HACMP Cluster Configuration
We recommend that you do all the configuration from one node and synchronize the cluster to propagate this information to other nodes.
Use this WebSMIT option to commit and distribute your changes automatically to all of the specified nodes.
To synchronize an HACMP cluster configuration:
1.Log in to a URL where WebSMIT is installed. The browser window displays the top-level WebSMIT screen.
2.In WebSMIT, select Extended Configuration > Extended Verification and Synchronization and press Continue.
If you configured the cluster correctly, HACMP synchronizes the configuration. HACMP issues errors if the configuration is not valid.
Displaying the HACMP Cluster Configuration
You can ask HACMP to show you the status of different configured components. The WebSMIT options for displaying different cluster entities are grouped together with the options for adding them to the cluster.
Here are some examples of the options you have:
•Show HACMP Topology by node, by network name, or by communication interface
•Change/Show Persistent IP Labels
•Show Cluster Applications and change/show application monitors per application
•Change/Show Service IP Labels
•Show all Resources by Node or Resource Groups
•View cluster logs (In WebSMIT, it is under System Management > Log Viewing and Management)
•Show Cluster Services (whether running or not).