Databases Reference
In-Depth Information
The gateway, on the other hand, is a centralized policy enforcement point. The
service endpoint exposed is that of the gateway, not of the machine on which the
service resides. All requests potentially incur an additional network hop as they
must go through the machine on which the gateway resides. Although physically,
the gateway is just another machine on the network, logically it sits in front of the
services for which it enforces policies.
Note that in a production deployment, it is possible to have multiple gateways
deployed so that a single gateway does not become a single point of failure in the
service infrastructure.
Distinctive benefits of gateways and agents
Gateways and agents both achieve the same result of securing and monitoring
services, but the different approaches they have provide different benefits. Both
gateways and agents can be used together, with some endpoints protected by agents
and others protected by gateways.
Benefits of gateways
Can protect services running on platforms for which no agent is available, for
example, a service implemented in Perl
Does not require modification of service endpoints
Less intrusive in an endpoint platform
Supports message routing
Supports failover
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