|
|
 |
|
| |
NOTE: CentOS Enterprise Linux is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux.
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:
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:
ScriptAlias /cgi-bin/ "/mnt/httpdservice/cgi-bin/"
|
-
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.
-
Click OK.
-
Choose => to save your changes.
|
|
|
