6.5. Update the Configuration

⁠6.5. Update the Configuration

At this point, Apache is ready to go, all that needs to be done is to add it to the cluster. Lets call the resource WebSite. We need to use an OCF script called apache in the heartbeat namespace ⁠^[12] , the only required parameter is the path to the main Apache configuration file and we’ll tell the cluster to check once a minute that apache is still running.

pcs resource create WebSite ocf:heartbeat:apache  \
      configfile=/etc/httpd/conf/httpd.conf \
      statusurl="http://localhost/server-status" op monitor interval=1min

By default, the operation timeout for all resource’s start, stop, and monitor operations is 20 seconds. In many cases this timeout period is less than the advised timeout period. For the purposes of this tutorial, we will adjust the global operation timeout default to 240 seconds.

# pcs resource op defaults timeout=240s
# pcs resource op defaults
timeout: 240s

After a short delay, we should see the cluster start apache

# pcs status

Last updated: Fri Sep 14 10:51:27 2012
Last change: Fri Sep 14 10:50:46 2012 via crm_attribute on pcmk-1
Stack: corosync
Current DC: pcmk-2 (2) - partition with quorum
Version: 1.1.8-1.el7-60a19ed12fdb4d5c6a6b6767f52e5391e447fec0
2 Nodes configured, unknown expected votes
2 Resources configured.

Online: [ pcmk-1 pcmk-2 ]

Full list of resources:

 ClusterIP      (ocf::heartbeat:IPaddr2):       Started pcmk-2
 WebSite        (ocf::heartbeat:apache):        Started pcmk-1

Wait a moment, the WebSite resource isn’t running on the same host as our IP address!

Note

If, in the pcs status output, you see the WebSite resource has failed to start, then you’ve likely not enabled the status URL correctly. You can check if this is the problem by running:

wget http://127.0.0.1/server-status

If you see Connection refused in the output, then this is indeed the problem. Check to ensure that Allow from 127.0.0.1 is present for the <Location /server-status> block.

^[12] Compare the key used here ocf:heartbeat:apache with the one we used earlier for the IP address: ocf:heartbeat:IPaddr2