Chapter 6: Creating Scalable and Highly Available Web Sites
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the Network icon in the Control Panel). Typically, you or someone else added the Web
site IP addresses to the server’s IP stack before installing ClusterCATS and creating
clusters. You now need to manually remove those IP addresses so that ClusterCATS can
dynamically create them in the IP stack according to server load and availability in the
cluster.
Understanding the roles of static and dynamic IP addresses can be confusing, so let’s
look at an example. Suppose I have a Web site, www.website.com, on my Web server
that I created months ago before I acquired and began using ClusterCATS. I now want
to cluster several Windows NT servers and configure them for maintenance support.
1.
On one of the servers I plan to cluster, I enter a static IP address for the server in its
IP stack (via the NIC) if one doesn’t already exist.
2.
I then remove the Web site’s IP address from the server’s IP stack also via the NIC.
3.
I open the appropriate Web server administration utility (Internet Service
Manager for IIS; Netscape Enterprise Manager for Netscape) and add my Web
site’s IP address in the appropriate IP address field for the site’s properties.
4.
Lastly, I verify that the server’s host name listed on the NIC is not the same name
that the Web site uses. If it is, I change one because the names must be unique.
Typically, it’s easier to change the server’s host name so that you don’t cause DNS
mapping resolution problems for your customers. However, weigh this against
how often the server’s physical location might change. If you relocate the server at
some point from its current location and plug it back into the network, your
configuration may no longer work.
The following diagram illustrates this process.
Summary of Contents for COLDFUSION 4.5-ADMINISTRING COLDFUSION...
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