Difference betwn shared address and logical hostname
Hello,
For cluster 3.2, could someone explain the diff betwn "clreslogicalhostname create" and "clressharedaddress create"? I thought the former was to share a logical hostname (depending on DNS to resolve to the ip address) betwn nodes, and the latter to share ip address (don't need to rely ip address resolution). But examples of the latter use a hostname and not an ip address, which leads to my confusion.
Thank you for clarifying this!
You've got things a little bit confused.
A logical hostname resource is an IP address (and associated hostname) that is placed in a fail-over resource group and used by the application(s) in that resource group. Such a resource group is resident on one node only and thus the IP address only exists, i.e. is plumbed in, on that cluster node too.
An example of such a service would be, say, an NFS service, with the IP address being the one you mount shares from. Alternatively, it could be an HA-Oracle database with the IP address being that of the listener that clients connect to.
A shared address resource is an IP address (and associated hostname) that is placed in a fail-over resource group but is used by applications in a scalable resource group. The shared address IP/hostname becomes a global IP address, such that it is physically plumbed in, e.g. on bge0:1, on the cluster node where the fail-over resource group is mastered and also plumbed in on the loopback interface, e.g. lo:2, of the cluster nodes that run the scalable services that depend on it.
An example of such a service would be a scalable web server, e.g. Apache or Sun Java Web Server, that is run on multiple cluster nodes at once and has requests load-balanced to them directly by the cluster. The scalable IP address would provide a single address that clients could use, yet the requests can be serviced by one of several nodes.
Hope that helps,
Tim
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