Editando Pacemaker (sección)

== Pacemaker ==
=== Instalación ===


PACEMAKER RHEL9

<syntaxhighlight lang="bash">
[root@nodo1 ~]# subscription-manager repos \
  --enable=rhel-9-for-x86_64-highavailability-rpms
Repository 'rhel-9-for-x86_64-highavailability-rpms' is enabled for this system.

[root@nodo2 ~]# subscription-manager repos \
  --enable=rhel-9-for-x86_64-highavailability-rpms
Repository 'rhel-9-for-x86_64-highavailability-rpms' is enabled for this system.
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo1 ~]# dnf install -y pacemaker pcs fence-agents-all lvm2
[root@nodo2 ~]# dnf install -y pacemaker pcs fence-agents-all lvm2
</syntaxhighlight>

=== Configuración Cluster ===

<syntaxhighlight lang="bash">
[root@nodo1 ~]# systemctl enable --now pcsd
Created symlink /etc/systemd/system/multi-user.target.wants/pcsd.service → /usr/lib/systemd/system/pcsd.service.
[root@nodo1 ~]#

[root@nodo2 ~]# systemctl enable --now pcsd
Created symlink /etc/systemd/system/multi-user.target.wants/pcsd.service → /usr/lib/systemd/system/pcsd.service.
[root@nodo2 ~]#
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo1 ~]# passwd hacluster
Changing password for user hacluster.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@nodo1 ~]#

[root@nodo2 ~]# passwd hacluster
Changing password for user hacluster.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@nodo2 ~]#
</syntaxhighlight>


<syntaxhighlight lang="bash">
root@nodo1 ~]# firewall-cmd --add-service=high-availability --permanent
success
[root@nodo1 ~]# firewall-cmd --reload
success
[root@nodo1 ~]#


[root@nodo2 ~]# firewall-cmd --add-service=high-availability --permanent
success
[root@nodo2 ~]# firewall-cmd --reload
success
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo1 ~]# pcs host auth nodo1 nodo2
Username: hacluster
Password:
nodo1: Authorized
nodo2: Authorized
[root@nodo1 ~]#

[root@nodo2 ~]#  pcs host auth nodo1 nodo2
Username: hacluster
Password:
nodo1: Authorized
nodo2: Authorized
[root@nodo2 ~]#
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs cluster setup iscsi-cluster nodo1 nodo2
No addresses specified for host 'nodo1', using 'nodo1'
No addresses specified for host 'nodo2', using 'nodo2'
Destroying cluster on hosts: 'nodo1', 'nodo2'...
nodo1: Successfully destroyed cluster
nodo2: Successfully destroyed cluster
Requesting remove 'pcsd settings' from 'nodo1', 'nodo2'
nodo2: successful removal of the file 'pcsd settings'
nodo1: successful removal of the file 'pcsd settings'
Sending 'corosync authkey', 'pacemaker authkey' to 'nodo1', 'nodo2'
nodo2: successful distribution of the file 'corosync authkey'
nodo2: successful distribution of the file 'pacemaker authkey'
nodo1: successful distribution of the file 'corosync authkey'
nodo1: successful distribution of the file 'pacemaker authkey'
Sending 'corosync.conf' to 'nodo1', 'nodo2'
nodo2: successful distribution of the file 'corosync.conf'
nodo1: successful distribution of the file 'corosync.conf'
Cluster has been successfully set up.
[root@nodo2 ~]#
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs status
Error: error running crm_mon, is pacemaker running?
  crm_mon: Connection to cluster failed: Connection refused
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs cluster start --all
nodo1: Starting Cluster...
nodo2: Starting Cluster...
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs cluster enable --all
nodo1: Cluster Enabled
nodo2: Cluster Enabled
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs status
Cluster name: iscsi-cluster

WARNINGS:
No stonith devices and stonith-enabled is not false
error: Resource start-up disabled since no STONITH resources have been defined
error: Either configure some or disable STONITH with the stonith-enabled option
error: NOTE: Clusters with shared data need STONITH to ensure data integrity
warning: Node nodo1 is unclean but cannot be fenced
warning: Node nodo2 is unclean but cannot be fenced
error: CIB did not pass schema validation
Errors found during check: config not valid

Cluster Summary:
  * Stack: unknown (Pacemaker is running)
  * Current DC: NONE
  * Last updated: Sat Jan  3 00:28:04 2026 on nodo2
  * Last change:  Sat Jan  3 00:27:58 2026 by hacluster via hacluster on nodo2
  * 2 nodes configured
  * 0 resource instances configured

Node List:
  * Node nodo1: UNCLEAN (offline)
  * Node nodo2: UNCLEAN (offline)

Full List of Resources:
  * No resources

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled
</syntaxhighlight>

<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs property set stonith-enabled=false
</syntaxhighlight>
<syntaxhighlight lang="bash">
[root@nodo2 ~]# pcs status
Cluster name: iscsi-cluster
Cluster Summary:
  * Stack: corosync (Pacemaker is running)
  * Current DC: nodo2 (version 2.1.10-1.el9-5693eaeee) - partition with quorum
  * Last updated: Sat Jan  3 00:34:35 2026 on nodo2
  * Last change:  Sat Jan  3 00:34:28 2026 by root via root on nodo2
  * 2 nodes configured
  * 0 resource instances configured

Node List:
  * Online: [ nodo1 nodo2 ]

Full List of Resources:
  * No resources

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled
[root@nodo2 ~]#
</syntaxhighlight>

=== Configuración LVM ===
==== Crear VG con el disco compartido: ====

<syntaxhighlight lang="bash">
[root@nodo1 ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.
</syntaxhighlight>
<syntaxhighlight lang="bash">
[root@nodo1 ~]# vgcreate vg_shared /dev/sdb
  Physical volume "/dev/sdb" successfully created.
  Volume group "vg_shared" successfully created
</syntaxhighlight>
<syntaxhighlight lang="bash">
[root@nodo1 ~]# lvcreate -n lv_data -l 100%FREE vg_shared
  Logical volume "lv_data" created.
</syntaxhighlight>
<syntaxhighlight lang="bash">
[root@nodo1 ~]# pvs
  PV         VG        Fmt  Attr PSize   PFree
  /dev/sda2  rhel      lvm2 a--  <19.00g    0
  /dev/sdb   vg_shared lvm2 a--   39.96g    0
[root@nodo1 ~]#

[root@nodo2 ~]# pvs
  PV         VG        Fmt  Attr PSize   PFree
  /dev/sda2  rhel      lvm2 a--  <19.00g    0
  /dev/sdb   vg_shared lvm2 a--   39.96g    0
[root@nodo2 ~]#
</syntaxhighlight>