Enterprise Server Concepts
TheEnterprise Server consists of one or more domains. A domain is an administrative
boundaryor context. Each domain has an administration server (also called Domain
AdministrationServer or DAS) associated with it and consists of zero or more standalone
instancesand/or clusters. Each cluster has one or more homogeneous server instances. A server
instanceis a single Java Virtual Machine (JVM) that runs the Application Server on a single
physicalmachine. Server instances (whether standalone or clustered) in a domain can run on
dierentphysical hosts.
Thissection contains the following topics:
■“Domain”on page 26
■“DomainAdministration Server (DAS)” on page 26
■“UsageProles” on page 27
■“Cluster”on page 28
■“NodeAgent” on page 28
■“ServerInstance” on page 29

Domain

Adomain is a group of instances that are administered together. However, an application server
instancecan belong to just one domain. In addition to the administration boundary, a domain
providesthe basic security structure whereby dierent administrators can administer specic
groups(domains) of application server instances. By grouping the server instances into separate
domains,dierent organizations and administrators can share a single Enterprise Server
installation.Each domain has its own conguration, log les, and application deployment areas
thatare independent of other domains. If the conguration is changed for one domain, the
congurationsof other domains are not aected.
TheSun GlassFish Enterprise Server installer creates the default administrative domain (named
domain1).It also creates an associated domain administration server (named server). You
mustprovide the administration server port number. The default administration server port is
4848.The installer also queries for the administration username and master password. After
installation,additional administration domains can be created.

Domain AdministrationSer ver(DAS)

Eachdomain has its own Domain Administration Server (DAS) with a unique port number.
TheAdmin Console communicates with a specic DAS to administer the associated domain.
EachAdmin Console session allows you to congure and manage the specic domain.
TheDomain Administration Server (DAS), is a specially-designated application server instance
thathosts the administrative applications. The DAS authenticates the administrator, accepts
requestsfrom administration tools, and communicates with server instances in the domain to
EnterpriseServer Concepts
SunGlassFishEnterprise Ser ver2.1 Administration Guide • December 200826