Apache Tomcat Component Dependencies (Sun Cluster Data Service for Apache Tomcat Guide for Solaris OS)

Sun Cluster Data Service for Apache Tomcat Guide for Solaris OS

Apache Tomcat Component Dependencies

You can configure the Sun Cluster HA for Apache Tomcat data service to protect one or more Apache Tomcat instances. Each instance needs to be covered by one Apache Tomcat resource. The dependencies between the Apache Tomcat resource and other needed resources are described in Table 3, in Table 4, or in Table 5.

Table 3 Dependencies Failover


Component	Description
Storage Resource	This resource can be a `SUNW.HAStoragePlus` or a `SUNW.HAStorage` resource type.
Apache Tomcat`(Mandatory)`	-> `SUNW.HAStoragePlus` resource or `SUNW.HAStorage` resource The Storage resource manages the Apache Tomcat File System Mount points and ensures that Apache Tomcat is not started until they are mounted.
Logical Host`(Mandatory)`	The Apache Tomcat has an implicit dependency on the logical hosts of the resource group, because it is based on the generic data service. On behalf of this reason a logical Host needs to exist, but no explicit dependency is necessary.

Because of the special requirements of a scalable configuration, you need no dependencies to storage or addresses, as long as every Apache Tomcat and its parameter file pfile is stored on the root file system. Otherwise follow Table 4.

Table 4 Dependencies Scalable


Component	Description
Storage Resource	This resource can be a `SUNW.HAStorage` or a `SUNW.HAStoragePlus` resource type.
Apache Tomcat`(Mandatory)`	-> Storage resource The Storage resource manages the Apache Tomcat File System Mount points and ensures that Apache Tomcat is not started until they are mounted.
Shared address`(Mandatory)`	The shared address resource resides in a separate resource group on which the scalable resource group depends.

A multiple master configuration is running on more than one nodes like a scalable configuration, but without a shared address. Because of the special requirements of a multiple masters configuration, you need no dependencies to storage or addresses, as long as every Apache Tomcat and its parameter file pfile is stored on the root file system. Otherwise follow Table 5.

Table 5 Dependencies Multiple Masters


Component	Description
Storage Resource	This resource can be a `SUNW.HAStorage` or a `SUNW.HAStoragePlus` resource type.
Apache Tomcat`(Mandatory)`	-> Storage resource The Storage resource manages the Apache Tomcat File System Mount points and ensures that Apache Tomcat is not started until they are mounted.
Shared address`(Mandatory)`	The shared address resource resides in a separate resource group on which the scalable resource group depends.

Note –

For more detailed information about Apache Tomcat, refer to the http://jakarta.apache.org web page.