The Apache HTTP Server must be installed and configured on all nodes in the
assigned failover domain, if used, or in the cluster. The basic server
configuration must be the same on all nodes on which it runs for the
service to fail over correctly. The following example shows a basic
Apache HTTP Server installation that includes no third-party modules or performance
tuning.
On all node in the cluster (or nodes in the failover domain, if used),
install the httpd RPM package. For example:
rpm -Uvh httpd-<version>.<arch>.rpm
To configure the Apache HTTP Server as a cluster service, perform the following
tasks:
Edit the /etc/httpd/conf/httpd.conf
configuration file and customize the file according to your
configuration. For example:
Specify the directory that contains the HTML files. Also
specify this mount point when adding the service to the cluster
configuration. It is only required to change this field if the
mountpoint for the website's content differs from the default
setting of /var/www/html/. For example:
DocumentRoot "/mnt/httpdservice/html"
Specify a unique IP address to which the service will listen
for requests. For example:
Listen 192.168.1.100:80
This IP address then must be configured as a cluster
resource for the service using the
Cluster Configuration Tool.
If the script directory resides in a non-standard location,
specify the directory that contains the CGI programs. For
example:
Specify the path that was used in the previous step, and set
the access permissions to default to that directory. For
example:
<Directory /mnt/httpdservice/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
</Directory>
Additional changes may need to be made to tune the Apache HTTP Server
or add module functionality. For information on setting up other
options, refer to the Red Hat Enterprise Linux System Administration Guide and the
Red Hat Enterprise Linux Reference Guide.
The standard Apache HTTP Server start script,
/etc/rc.d/init.d/httpd is also used within the
cluster framework to start and stop the Apache HTTP Server on the active
cluster node. Accordingly, when configuring the service, specify
this script by adding it as a Script resource
in the Cluster Configuration Tool.
Copy the configuration file over to the other nodes of the
cluster (or nodes of the failover domain, if configured).
Before the service is added to the cluster configuration, ensure that
the Apache HTTP Server directories are not mounted. Then, on one node, invoke the
Cluster Configuration Tool to add the service, as
follows. This example assumes a failover domain named
httpd-domain was created for this service.
Add the init script for the Apache HTTP Server service.
Select the Resources tab and
click Create a Resource. The
Resources Configureation properties dialog
box is displayed.
Select Script form the drop down
menu.
Enter a Name to be associated with the
Apache HTTP Server service.
Specify the path to the Apache HTTP Server init script (for example,
/etc/rc.d/init.d/httpd) in the
File (with path) field.
Click OK.
Add a device for the Apache HTTP Server content files and/or custom scripts.
Click Create a Resource.
In the Resource Configuration dialog,
select File System from the drop-down menu.
Enter the Name for the resource (for
example, httpd-content.
Choose ext3 from the File
System Type drop-down menu.
Enter the mount point in the Mount
Point field (for example,
/var/www/html/).
Enter the device special file name in the
Device field (for example,
/dev/sda3).
Add an IP address for the Apache HTTP Server service.
Click Create a Resource.
Choose IP Address from the
drop-down menu.
Enter the IP Address to be
associatged with the Apache HTTP Server service.
Make sure that the Monitor Link
checkbox is left checked.
Click OK.
Click the Services property.
Create the Apache HTTP Server service.
Click Create a Service. Type a
Name for the service in the
Add a Service dialog.
In the Service Management dialog,
select a Failover Domain from the
drop-down menu or leave it as None.
Click the Add a Shared Resource to this
service button. From the available list, choose
each resource that you created in the previous steps. Repeat
this step until all resources have been added.
