10. Slony-I Path Communications

Slony-I uses PostgreSQL DSNs in three contexts to establish access to databases:

The distinctions and possible complexities of paths are not normally an issue for people with simple networks where all the hosts can see one another via a comparatively "global" set of network addresses. In contrast, it matters rather a lot for those with complex firewall configurations, nodes at multiple locations, and the issue where nodes may not be able to all talk to one another via a uniform set of network addresses.

Consider the attached diagram, which describes a set of six nodes

There is also room for discussion of SSH tunnelling here...