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Doc: Clusters from Scratch: Update Apache chapter.
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‎doc/sphinx/Clusters_from_Scratch/apache.rst‎

Lines changed: 54 additions & 58 deletions
Original file line numberDiff line numberDiff line change
@@ -65,7 +65,7 @@ it fails. On both nodes, configure this URL as follows:
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# cat <<-END >/etc/httpd/conf.d/status.conf
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<Location /server-status>
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SetHandler server-status
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Require local
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Require all granted
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</Location>
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END
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@@ -105,7 +105,6 @@ tutorial, we will adjust the global operation timeout default to 240 seconds.
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.. code-block:: console
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[root@pcmk-1 ~]# pcs resource op defaults
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No defaults set
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[root@pcmk-1 ~]# pcs resource op defaults update timeout=240s
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Warning: Defaults do not apply to resources which override them with their own defined values
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[root@pcmk-1 ~]# pcs resource op defaults
@@ -135,10 +134,10 @@ After a short delay, we should see the cluster start Apache.
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[root@pcmk-1 ~]# pcs status
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Cluster name: mycluster
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Cluster Summary:
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* Stack: corosync
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* Current DC: pcmk-1 (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum
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* Last updated: Wed Jul 27 00:47:44 2022
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* Last change: Wed Jul 27 00:47:23 2022 by root via cibadmin on pcmk-1
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* Stack: corosync (Pacemaker is running)
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* Current DC: pcmk-1 (version 3.0.1-3.el10-6a90427) - partition with quorum
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* Last updated: Tue Feb 24 16:34:07 2026 on pcmk-1
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* Last change: Tue Feb 24 16:33:50 2026 by root via root on pcmk-1
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* 2 nodes configured
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* 3 resource instances configured
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@@ -148,7 +147,7 @@ After a short delay, we should see the cluster start Apache.
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Full List of Resources:
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* fence_dev (stonith:some_fence_agent): Started pcmk-1
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* ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-2
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* WebSite (ocf:heartbeat:apache): Started pcmk-2
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Daemon Status:
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corosync: active/disabled
@@ -211,20 +210,18 @@ is not active anywhere, ``WebSite`` will not be permitted to run.
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.. code-block:: console
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[root@pcmk-1 ~]# pcs constraint colocation add WebSite with ClusterIP INFINITY
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[root@pcmk-1 ~]# pcs constraint colocation add WebSite with ClusterIP score=INFINITY
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[root@pcmk-1 ~]# pcs constraint
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Location Constraints:
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Ordering Constraints:
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Colocation Constraints:
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WebSite with ClusterIP (score:INFINITY)
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Ticket Constraints:
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resource 'WebSite' with resource 'ClusterIP'
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score=INFINITY
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[root@pcmk-1 ~]# pcs status
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Cluster name: mycluster
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Cluster Summary:
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* Stack: corosync
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* Current DC: pcmk-1 (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum
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* Last updated: Wed Jul 27 00:49:33 2022
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* Last change: Wed Jul 27 00:49:16 2022 by root via cibadmin on pcmk-1
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* Stack: corosync (Pacemaker is running)
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* Current DC: pcmk-1 (version 3.0.1-3.el10-6a90427) - partition with quorum
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* Last updated: Tue Feb 24 16:37:25 2026 on pcmk-1
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* Last change: Tue Feb 24 16:36:36 2026 by root via root on pcmk-1
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* 2 nodes configured
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* 3 resource instances configured
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@@ -234,7 +231,7 @@ is not active anywhere, ``WebSite`` will not be permitted to run.
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Full List of Resources:
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* fence_dev (stonith:some_fence_agent): Started pcmk-1
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* ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-1
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Daemon Status:
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corosync: active/disabled
@@ -275,12 +272,11 @@ also implies that the recovery of ``ClusterIP`` will trigger the recovery of
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[root@pcmk-1 ~]# pcs constraint order ClusterIP then WebSite
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Adding ClusterIP WebSite (kind: Mandatory) (Options: first-action=start then-action=start)
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[root@pcmk-1 ~]# pcs constraint
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Location Constraints:
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Ordering Constraints:
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start ClusterIP then start WebSite (kind:Mandatory)
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Colocation Constraints:
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WebSite with ClusterIP (score:INFINITY)
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Ticket Constraints:
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resource 'WebSite' with resource 'ClusterIP'
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score=INFINITY
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Order Constraints:
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start resource 'ClusterIP' then start 'WebSite'
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.. NOTE::
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@@ -324,21 +320,19 @@ how strongly we'd like the resource to run at this location.
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[root@pcmk-1 ~]# pcs constraint location WebSite prefers pcmk-2=50
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[root@pcmk-1 ~]# pcs constraint
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Location Constraints:
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Resource: WebSite
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Enabled on:
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Node: pcmk-2 (score:50)
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Ordering Constraints:
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start ClusterIP then start WebSite (kind:Mandatory)
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resource 'WebSite' prefers node 'pcmk-2' with score 50
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Colocation Constraints:
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WebSite with ClusterIP (score:INFINITY)
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Ticket Constraints:
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resource 'WebSite' with resource 'ClusterIP'
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score=INFINITY
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Order Constraints:
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start resource 'ClusterIP' then start 'WebSite'
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[root@pcmk-1 ~]# pcs status
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Cluster name: mycluster
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Cluster Summary:
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* Stack: corosync
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* Current DC: pcmk-1 (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum
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* Last updated: Wed Jul 27 00:51:13 2022
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* Last change: Wed Jul 27 00:51:07 2022 by root via cibadmin on pcmk-1
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* Stack: corosync (Pacemaker is running)
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* Current DC: pcmk-1 (version 3.0.1-3.el10-6a90427) - partition with quorum
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* Last updated: Tue Feb 24 16:44:43 2026 on pcmk-1
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* Last change: Tue Feb 24 16:43:35 2026 by root via root on pcmk-1
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* 2 nodes configured
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* 3 resource instances configured
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@@ -348,7 +342,7 @@ how strongly we'd like the resource to run at this location.
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Full List of Resources:
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* fence_dev (stonith:some_fence_agent): Started pcmk-1
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* ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-1
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Daemon Status:
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corosync: active/disabled
@@ -367,18 +361,22 @@ To see the current placement scores, you can use a tool called
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.. code-block:: console
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[root@pcmk-1 ~]# crm_simulate -sL
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[ pcmk-1 pcmk-2 ]
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fence_dev (stonith:some_fence_agent): Started pcmk-1
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ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-1
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WebSite (ocf:heartbeat:apache): Started pcmk-1
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pcmk__native_allocate: fence_dev allocation score on pcmk-1: 100
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pcmk__native_allocate: fence_dev allocation score on pcmk-2: 0
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pcmk__native_allocate: ClusterIP allocation score on pcmk-1: 200
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pcmk__native_allocate: ClusterIP allocation score on pcmk-2: 50
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pcmk__native_allocate: WebSite allocation score on pcmk-1: 100
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pcmk__native_allocate: WebSite allocation score on pcmk-2: -INFINITY
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Current cluster status:
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* Node List:
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* Online: [ pcmk-1 pcmk-2 ]
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* Full List of Resources:
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* ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-1
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* fence_dev (stonith:some_fence_agent): Started pcmk-1
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* WebSite (ocf:heartbeat:apache): Started pcmk-1
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Assignment Scores:
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* pcmk__native_allocate: ClusterIP allocation score on pcmk-1: 200
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* pcmk__native_allocate: ClusterIP allocation score on pcmk-2: 50
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* pcmk__native_allocate: fence_dev allocation score on pcmk-1: 100
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* pcmk__native_allocate: fence_dev allocation score on pcmk-2: -INFINITY
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* pcmk__native_allocate: WebSite allocation score on pcmk-1: 100
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* pcmk__native_allocate: WebSite allocation score on pcmk-2: -INFINITY
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.. index::
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single: resource; moving manually
@@ -407,21 +405,19 @@ as before.
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resource 'WebSite' is running on node 'pcmk-2'
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[root@pcmk-1 ~]# pcs constraint
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Location Constraints:
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Resource: WebSite
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Enabled on:
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Node: pcmk-2 (score:50)
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Ordering Constraints:
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start ClusterIP then start WebSite (kind:Mandatory)
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resource 'WebSite' prefers node 'pcmk-2' with score 50
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Colocation Constraints:
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WebSite with ClusterIP (score:INFINITY)
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Ticket Constraints:
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resource 'WebSite' with resource 'ClusterIP'
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score=INFINITY
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Order Constraints:
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start resource 'ClusterIP' then start 'WebSite'
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[root@pcmk-1 ~]# pcs status
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Cluster name: mycluster
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Cluster Summary:
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* Stack: corosync
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* Current DC: pcmk-1 (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum
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* Last updated: Wed Jul 27 00:54:23 2022
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* Last change: Wed Jul 27 00:53:48 2022 by root via cibadmin on pcmk-1
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* Stack: corosync (Pacemaker is running)
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* Current DC: pcmk-1 (version 3.0.1-3.el10-6a90427) - partition with quorum
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* Last updated: Tue Feb 24 16:56:37 2026 on pcmk-1
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* Last change: Tue Feb 24 16:54:28 2026 by root via root on pcmk-1
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* 2 nodes configured
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* 3 resource instances configured
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@@ -431,7 +427,7 @@ as before.
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Full List of Resources:
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* fence_dev (stonith:some_fence_agent): Started pcmk-1
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* ClusterIP (ocf:heartbeat:IPaddr2): Started pcmk-2
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* WebSite (ocf:heartbeat:apache): Started pcmk-2
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* WebSite (ocf:heartbeat:apache): Started pcmk-2
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Daemon Status:
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corosync: active/disabled

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