MACROMEDIA COLDFUSION 5-ADVANCED ADMINISTRATION, Manual, Page: 331 / 372

Using Maintenance Mode (Windows only) 313
10 To allow this server to participate in the cluster as normal, select Unrestricted
from the Restriction Status drop-down box.
11 Click OK.
Using Maintenance Mode (Windows only)
Putting a ClusterCATS Server in Maintenance mode lets you remove a server from an
active cluster gracefully so that you can perform necessary updates or maintenance
tasks without disrupting your users. Using the instructions in this section, you can
take a server offline while allowing users to finish their current sessions.
Once in Maintenance mode, you might perform the following tasks that would
normally disrupt users’ experiences:
•
Upgrading server software or applications
•
Change content on the Web site
•
Troubleshooting problems
When a server is in maintenance mode, all inbound HTTP traffic heading for the
affected server is redirected to the most available server in the cluster. After you
complete your maintenance tasks and take the server out of Maintenance mode, the
servers that temporarily assumed the restricted server’s IP address and HTTP traffic
return the IP address back to the affected server so that it can receive and process
HTTP requests.
Note
Allaire recommends that you set up your clusters with ClusterCATS dynamic IP
addressing for using Maintenance mode. For more information, see
“Using Server
Failover” on page 340 .
Once enabled, maintenance performs the following:
•
Clustered Web Server on the system is set to a busy state for user specified period
of time. All new traffic to the Web site will be redirect to another server in the
cluster.
•
If you are running session-aware load-balancing, users who have begun sessions
can continue until the ClusterCATS service is shutdown.
•
Once the timeout period has expired the ClusterCATS service will be shut down.
•
If you are running with ClusterCATS dynamic addressing, the IP addresses
associated with cluster members for this server will be failed over to another
server. Thus allowing the site to continue to function, while maintenance is
performed.