following is a paragraph from glassfish 3.1.2.2 administration guide
You can rotate log files manually by using the rotate-log subcommand
in remote mode. The default target of this subcommand is the DAS.
Optionally, you can target a configuration, server, instance, or
cluster.You can rotate log files manually by using the rotate-log
subcommand in remote mode. The default target of this subcommand is
the DAS. Optionally, you can target a configuration, server, instance,
or cluster.
what is the difference between configuration, server, instance and cluster ? i understand cluster is a collection of instances. but what is difference between server and instance and configuration ?
From the Glassfish admin guide:
The default target for these two subcommands is the DAS. However, you
can optionally specify one of the following targets:
Configuration: to target all instances or clusters that share a specific configuration name.
Server: to target only a specific server.
Instance: to target only a specific instance.
Cluster: to target only a specific cluster.
A GlassFish Server instance is a single Virtual Machine for the Java
platform (Java Virtual Machine or JVM machine) on a single node in
which GlassFish Server is running. A node defines the host where the
GlassFish Server instance resides.
and
It is usually sufficient to create a single server instance on a
machine, since GlassFish Server and accompanying JVM are both designed
to scale to multiple processors. However, it can be beneficial to
create multiple instances on one machine for application isolation and
rolling upgrades.
This means you can have multiple instances of glassfish running on a single server, and you can either target a single instance or the whole server.
