Pacemaker

Creación de un clúster Pacemaker ( EN DESARROLLO)

Introducción

En este laboratorio se configura un clúster Pacemaker utilizando almacenamiento compartido vía iSCSI. Para ello se emplean un mínimo de tres máquinas:

• Dos nodos que formarán el clúster Pacemaker
• Una máquina adicional que actuará como servidor de almacenamiento SAN

El objetivo es simular el uso de discos compartidos de una cabina de almacenamiento en una infraestructura real.

Topología del laboratorio

Máquinas

• Servidor SAN
  • Icecube — 192.168.1.80

• Nodos Pacemaker
  • Nodo1 — 192.168.1.81
  • Nodo2 — 192.168.1.82

Configuración del almacenamiento SAN

Para simular una cabina de almacenamiento se compartirá un disco mediante iSCSI hacia ambos nodos del clúster Pacemaker.

Instalación de paquetes requeridos

En el servidor SAN (target):

[root@icecube ~]# subscription-manager register
Registering to: subscription.rhsm.redhat.com:443/subscription
Username: $USER
Password:
The system has been registered with ID: dddb6e1e-049a-4ea2-8943-403ec63bb06f
The registered system name is: icecube

Activar los repositorios EPEL:

[root@icecube ~]# subscription-manager repos --enable codeready-builder-for-rhel-9-$(arch)-rpms
Repository 'codeready-builder-for-rhel-9-x86_64-rpms' is enabled for this system.
[root@icecube ~]# dnf install \
https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
Updating Subscription Management repositories.
Red Hat CodeReady Linux Builder for RHEL 9 x86_64 (RPMs)                           24 MB/s |  15 MB     00:00
epel-release-latest-9.noarch.rpm                                                   41 kB/s |  19 kB     00:00
Dependencies resolved.
===============================================================================================================================
 Package                                        Architecture           Version                      Repository          Size
===============================================================================================================================
Installing:
 epel-release                                   noarch                 9-10.el9                     @commandline        19 k

Transaction Summary
===============================================================================================================================
Install  1 Package

Total size: 19 k
Installed size: 26 k
Is this ok [y/N]: y
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                               1/1
  Installing       : epel-release-9-10.el9.noarch                                  1/1
  Running scriptlet: epel-release-9-10.el9.noarch                                  1/1
Many EPEL packages require the CodeReady Builder (CRB) repository.
It is recommended that you run /usr/bin/crb enable to enable the CRB repository.

  Verifying        : epel-release-9-10.el9.noarch                                  1/1
Installed products updated.

Installed:
  epel-release-9-10.el9.noarch

Complete!

Instalar paquetes requeridos:

[root@icecube ~]# dnf --enablerepo=epel* install targetcli
Updating Subscription Management repositories.
Last metadata expiration check: 0:02:26 ago on Fri 02 Jan 2026 09:50:24 PM CET.
Dependencies resolved.
======================================================================================================================================================
 Package                                         Architecture          Version                     Repository                            Size
======================================================================================================================================================
Installing:                                                                                  
 targetcli                                       noarch                2.1.57-2.el9                rhel-9-for-x86_64-appstream-rpms      79 k
Installing dependencies:                                                                     
 python3-configshell                             noarch                1:1.1.30-1.el9              rhel-9-for-x86_64-baseos-rpms         76 k
 python3-kmod                                    x86_64                0.9-32.el9                  rhel-9-for-x86_64-baseos-rpms         88 k
 python3-pyparsing                               noarch                2.4.7-9.el9                 rhel-9-for-x86_64-baseos-rpms        154 k
 python3-rtslib                                  noarch                2.1.76-1.el9                rhel-9-for-x86_64-appstream-rpms     104 k
 python3-urwid                                   x86_64                2.1.2-4.el9                 rhel-9-for-x86_64-baseos-rpms        842 k
 target-restore                                  noarch                2.1.76-1.el9                rhel-9-for-x86_64-appstream-rpms      16 k
																							 
Transaction Summary                                                                          
======================================================================================================================================================
Install  7 Packages

Total download size: 1.3 M
Installed size: 5.0 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): python3-pyparsing-2.4.7-9.el9.noarch.rpm                               1.0 MB/s | 154 kB     00:00
(2/7): python3-kmod-0.9-32.el9.x86_64.rpm                                     347 kB/s |  88 kB     00:00
(3/7): python3-configshell-1.1.30-1.el9.noarch.rpm                            683 kB/s |  76 kB     00:00
(4/7): target-restore-2.1.76-1.el9.noarch.rpm                                 145 kB/s |  16 kB     00:00
(5/7): python3-rtslib-2.1.76-1.el9.noarch.rpm                                 900 kB/s | 104 kB     00:00
(6/7): targetcli-2.1.57-2.el9.noarch.rpm                                      677 kB/s |  79 kB     00:00
(7/7): python3-urwid-2.1.2-4.el9.x86_64.rpm                                   318 kB/s | 842 kB     00:02
---------------------------------------------------------------------------------------
Total                                                                         513 kB/s | 1.3 MB     00:02
Red Hat Enterprise Linux 9 for x86_64 - BaseOS (RPMs)                         2.7 MB/s | 3.6 kB     00:00
Importing GPG key 0xFD431D51:                                                 
 Userid     : "Red Hat, Inc. (release key 2) <security@redhat.com>"
 Fingerprint: 567E 347A D004 4ADE 55BA 8A5F 199E 2F91 FD43 1D51
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Is this ok [y/N]: y
Key imported successfully
Importing GPG key 0x5A6340B3:
 Userid     : "Red Hat, Inc. (auxiliary key 3) <security@redhat.com>"
 Fingerprint: 7E46 2425 8C40 6535 D56D 6F13 5054 E4A4 5A63 40B3
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Is this ok [y/N]: y
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                            1/1
  Installing       : python3-urwid-2.1.2-4.el9.x86_64           1/7
  Installing       : python3-pyparsing-2.4.7-9.el9.noarch       2/7
  Installing       : python3-configshell-1:1.1.30-1.el9.noarch  3/7
  Installing       : python3-kmod-0.9-32.el9.x86_64             4/7
  Installing       : python3-rtslib-2.1.76-1.el9.noarch         5/7
  Installing       : target-restore-2.1.76-1.el9.noarch         6/7
  Running scriptlet: target-restore-2.1.76-1.el9.noarch         6/7
  Installing       : targetcli-2.1.57-2.el9.noarch              7/7
  Running scriptlet: targetcli-2.1.57-2.el9.noarch              7/7
  Verifying        : python3-kmod-0.9-32.el9.x86_64             1/7
  Verifying        : python3-pyparsing-2.4.7-9.el9.noarch       2/7
  Verifying        : python3-urwid-2.1.2-4.el9.x86_64           3/7
  Verifying        : python3-configshell-1:1.1.30-1.el9.noarch  4/7
  Verifying        : target-restore-2.1.76-1.el9.noarch         5/7
  Verifying        : python3-rtslib-2.1.76-1.el9.noarch         6/7
  Verifying        : targetcli-2.1.57-2.el9.noarch              7/7
Installed products updated.

Installed:
  python3-configshell-1:1.1.30-1.el9.noarch       python3-kmod-0.9-32.el9.x86_64       python3-pyparsing-2.4.7-9.el9.noarch       python3-rtslib-2.1.76-1.el9.noarch       python3-urwid-2.1.2-4.el9.x86_64       target-restore-2.1.76-1.el9.noarch       targetcli-2.1.57-2.el9.noarch

Complete!

Configuración del iSCSI Target (targetcli)

Configuraciones previas:

Habilitar el servicio target:

[root@icecube ~]# systemctl enable --now target

[root@icecube ~]# systemctl status target
● target.service - Restore LIO kernel target configuration
     Loaded: loaded (/usr/lib/systemd/system/target.service; enabled; preset: disabled)
     Active: active (exited) since Fri 2026-01-02 23:10:39 CET; 2min 44s ago
   Main PID: 5382 (code=exited, status=0/SUCCESS)
        CPU: 49ms

Jan 02 23:10:39 icecube systemd[1]: Starting Restore LIO kernel target configuration...
Jan 02 23:10:39 icecube systemd[1]: Finished Restore LIO kernel target configuration.
[root@icecube ~]#

Verificar que existe un LV para usarlo para crear la LUN:

[root@icecube ~]# lsblk /dev/vg_iscsi/lv_storage
NAME                MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
vg_iscsi-lv_storage 253:2    0  40G  0 lvm
[root@icecube ~]# f

Configurar el Target

Verificar que no existe configuración actualmente en targetcli:

[root@icecube ~]# targetcli ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 0]
  | o- fileio ................................................................................................. [Storage Objects: 0]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 0]
  o- loopback ......................................................................................................... [Targets: 0]
[root@icecube ~]#

Acceder a la consola de configuración y crear una LUN:

[root@icecube ~]# targetcli
targetcli shell version 2.1.57
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/> /backstores/block create lun01 /dev/vg_iscsi/lv_storage
Created block storage object lun01 using /dev/vg_iscsi/lv_storage.

Crear el target y el backstore iSCSI:

/> /iscsi create iqn.2026-01.icecube:storage.target01
Created target iqn.2026-01.icecube:storage.target01.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.

/> /iscsi/iqn.2026-01.icecube:storage.target01/tpg1/luns create /backstores/block/lun01
Created LUN 0.

Configurar ACLs y autenticación CHAP:

/> /iscsi/iqn.2026-01.icecube:storage.target01/tpg1/acls create iqn.2026-01.icecube:node01.initiator01
Created Node ACL for iqn.2026-01.icecube:node01.initiator01
Created mapped LUN 0.

/> /iscsi/iqn.2026-01.icecube:storage.target01/tpg1 set attribute authentication=1
Parameter authentication is now '1'.

/> /iscsi/iqn.2026-01.icecube:storage.target01/tpg1/acls/iqn.2026-01.icecube:node01.initiator01 set auth userid=bonzo
Parameter userid is now 'bonzo'.

/> /iscsi/iqn.2026-01.icecube:storage.target01/tpg1/acls/iqn.2026-01.icecube:node01.initiator01 set auth password=PASSWORD2020
Parameter password is now 'PASSWORD2020'.

Salir y guardar la configuración:

/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup/.
Configuration saved to /etc/target/saveconfig.json

Verificación del fichero de configuracion:

[root@icecube ~]# cat /etc/target/saveconfig.json
{
  "fabric_modules": [],
  "storage_objects": [
    {
      "alua_tpgs": [
        {
          "alua_access_state": 0,
          "alua_access_status": 0,
          "alua_access_type": 3,
          "alua_support_active_nonoptimized": 1,
          "alua_support_active_optimized": 1,
          "alua_support_offline": 1,
          "alua_support_standby": 1,
          "alua_support_transitioning": 1,
          "alua_support_unavailable": 1,
          "alua_write_metadata": 0,
          "implicit_trans_secs": 0,
          "name": "default_tg_pt_gp",
          "nonop_delay_msecs": 100,
          "preferred": 0,
          "tg_pt_gp_id": 0,
          "trans_delay_msecs": 0
        }
      ],
      "attributes": {
        "alua_support": 1,
        "block_size": 512,
        "emulate_3pc": 1,
        "emulate_caw": 1,
        "emulate_dpo": 1,
        "emulate_fua_read": 1,
        "emulate_fua_write": 1,
        "emulate_model_alias": 1,
        "emulate_pr": 1,
        "emulate_rest_reord": 0,
        "emulate_rsoc": 1,
        "emulate_tas": 1,
        "emulate_tpu": 0,
        "emulate_tpws": 0,
        "emulate_ua_intlck_ctrl": 0,
        "emulate_write_cache": 0,
        "enforce_pr_isids": 1,
        "force_pr_aptpl": 0,
        "is_nonrot": 0,
        "max_unmap_block_desc_count": 0,
        "max_unmap_lba_count": 0,
        "max_write_same_len": 65535,
        "optimal_sectors": 65528,
        "pgr_support": 1,
        "pi_prot_format": 0,
        "pi_prot_type": 0,
        "pi_prot_verify": 0,
        "queue_depth": 128,
        "submit_type": 0,
        "unmap_granularity": 0,
        "unmap_granularity_alignment": 0,
        "unmap_zeroes_data": 0
      },
      "dev": "/dev/vg_iscsi/lv_storage",
      "name": "lun01",
      "plugin": "block",
      "readonly": false,
      "write_back": false,
      "wwn": "b1e53820-2d0e-4605-a66e-96ed4d4738a9"
    }
  ],
  "targets": [
    {
      "fabric": "iscsi",
      "parameters": {
        "cmd_completion_affinity": "-1"
      },
      "tpgs": [
        {
          "attributes": {
            "authentication": 1,
            "cache_dynamic_acls": 0,
            "default_cmdsn_depth": 64,
            "default_erl": 0,
            "demo_mode_discovery": 1,
            "demo_mode_write_protect": 1,
            "fabric_prot_type": 0,
            "generate_node_acls": 0,
            "login_keys_workaround": 1,
            "login_timeout": 15,
            "prod_mode_write_protect": 0,
            "t10_pi": 0,
            "tpg_enabled_sendtargets": 1
          },
          "enable": true,
          "luns": [
            {
              "alias": "4937399dfd",
              "alua_tg_pt_gp_name": "default_tg_pt_gp",
              "index": 0,
              "storage_object": "/backstores/block/lun01"
            }
          ],
          "node_acls": [
            {
              "attributes": {
                "authentication": -1,
                "dataout_timeout": 3,
                "dataout_timeout_retries": 5,
                "default_erl": 0,
                "nopin_response_timeout": 30,
                "nopin_timeout": 15,
                "random_datain_pdu_offsets": 0,
                "random_datain_seq_offsets": 0,
                "random_r2t_offsets": 0
              },
              "chap_password": "PASSWORD2020",
              "chap_userid": "bonzo",
              "mapped_luns": [
                {
                  "alias": "612d32f2e4",
                  "index": 0,
                  "tpg_lun": 0,
                  "write_protect": false
                }
              ],
              "node_wwn": "iqn.2026-01.icecube:node01.initiator01"
            }
          ],
          "parameters": {
            "AuthMethod": "CHAP",
            "DataDigest": "CRC32C,None",
            "DataPDUInOrder": "Yes",
            "DataSequenceInOrder": "Yes",
            "DefaultTime2Retain": "20",
            "DefaultTime2Wait": "2",
            "ErrorRecoveryLevel": "0",
            "FirstBurstLength": "65536",
            "HeaderDigest": "CRC32C,None",
            "IFMarkInt": "Reject",
            "IFMarker": "No",
            "ImmediateData": "Yes",
            "InitialR2T": "Yes",
            "MaxBurstLength": "262144",
            "MaxConnections": "1",
            "MaxOutstandingR2T": "1",
            "MaxRecvDataSegmentLength": "8192",
            "MaxXmitDataSegmentLength": "262144",
            "OFMarkInt": "Reject",
            "OFMarker": "No",
            "TargetAlias": "LIO Target"
          },
          "portals": [
            {
              "ip_address": "0.0.0.0",
              "iser": false,
              "offload": false,
              "port": 3260
            }
          ],
          "tag": 1
        }
      ],
      "wwn": "iqn.2026-01.icecube:storage.target01"
    }
  ]
}

Comprobación del servicio iSCSI

Ver estado de configuracion de targetcli:

[root@icecube ~]# targetcli ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 1]
  | | o- lun01 ........................................................... [/dev/vg_iscsi/lv_storage (40.0GiB) write-thru activated]
  | |   o- alua ................................................................................................... [ALUA Groups: 1]
  | |     o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized]
  | o- fileio ................................................................................................. [Storage Objects: 0]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 1]
  | o- iqn.2026-01.icecube:storage.target01 .............................................................................. [TPGs: 1]
  |   o- tpg1 .......................................................................................... [no-gen-acls, auth per-acl]
  |     o- acls .......................................................................................................... [ACLs: 1]
  |     | o- iqn.2026-01.icecube:node01.initiator01 ................................................... [1-way auth, Mapped LUNs: 1]
  |     |   o- mapped_lun0 ................................................................................. [lun0 block/lun01 (rw)]
  |     o- luns .......................................................................................................... [LUNs: 1]
  |     | o- lun0 ...................................................... [block/lun01 (/dev/vg_iscsi/lv_storage) (default_tg_pt_gp)]
  |     o- portals .................................................................................................... [Portals: 1]
  |       o- 0.0.0.0:3260 ..................................................................................................... [OK]
  o- loopback ......................................................................................................... [Targets: 0]

Verificar que el puerto iSCSI está en escucha:

[root@icecube ~]# ss -napt | grep 3260
LISTEN     0      256          *:3260                     *:*
[root@icecube ~]#

[root@icecube ~]# firewall-cmd --add-service=iscsi-target --permanent
success

[root@icecube ~]# firewall-cmd --reload
success

Configuración SELinux del Target

Ajustar contextos SELinux:

[root@icecube ~]# chcon -R -t tgtd_var_lib_t /var/lib/iscsi_disks

[root@icecube ~]# semanage fcontext -a -t tgtd_var_lib_t /var/lib/iscsi_disks

Configuración del iSCSI Initiator en los nodos

Los siguientes pasos deben ejecutarse en todos los nodos del clúster.

Instalación de paquetes

[root@nodo1 ~]# dnf -y install iscsi-initiator-utils
Updating Subscription Management repositories.                                          
Red Hat Enterprise Linux 9 for x86_64 - AppStream (RPMs)                                                                                       43 MB/s |  79 MB     00:01
Red Hat CodeReady Linux Builder for RHEL 9 x86_64 (RPMs)                                                                                       19 MB/s |  15 MB     00:00
Red Hat Enterprise Linux 9 for x86_64 - BaseOS (RPMs)                                                                                          45 MB/s |  95 MB     00:02
Package iscsi-initiator-utils-6.2.1.9-1.gita65a472.el9.x86_64 is already installed.
Dependencies resolved.
=========================================================================================================================================================================
 Package                                               Architecture      Version                                 Repository                                         Size
=========================================================================================================================================================================
Upgrading:                                                                                                                                             
 iscsi-initiator-utils                                 x86_64            6.2.1.11-0.git4b3e853.el9               rhel-9-for-x86_64-baseos-rpms                     392 k
 iscsi-initiator-utils-iscsiuio                        x86_64            6.2.1.11-0.git4b3e853.el9               rhel-9-for-x86_64-baseos-rpms                      81 k
																																					  
Transaction Summary                                                                                                                                    
=========================================================================================================================================================================
Upgrade  2 Packages

Total download size: 473 k
Downloading Packages:
(1/2): iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el9.x86_64.rpm                                                                       1.6 MB/s | 392 kB     00:00
(2/2): iscsi-initiator-utils-iscsiuio-6.2.1.11-0.git4b3e853.el9.x86_64.rpm                                                              330 kB/s |  81 kB     00:00
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                   1.9 MB/s | 473 kB     00:00
Red Hat Enterprise Linux 9 for x86_64 - BaseOS (RPMs)                                                                                   3.1 MB/s | 3.6 kB     00:00
Importing GPG key 0xFD431D51:
 Userid     : "Red Hat, Inc. (release key 2) <security@redhat.com>"
 Fingerprint: 567E 347A D004 4ADE 55BA 8A5F 199E 2F91 FD43 1D51
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Key imported successfully
Importing GPG key 0x5A6340B3:
 Userid     : "Red Hat, Inc. (auxiliary key 3) <security@redhat.com>"
 Fingerprint: 7E46 2425 8C40 6535 D56D 6F13 5054 E4A4 5A63 40B3
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                                 1/1
  Upgrading        : iscsi-initiator-utils-iscsiuio-6.2.1.11-0.git4b3e853.el9.x86_64                                                 1/4
  Running scriptlet: iscsi-initiator-utils-iscsiuio-6.2.1.11-0.git4b3e853.el9.x86_64                                                 1/4
  Upgrading        : iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el9.x86_64                                                          2/4
  Running scriptlet: iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el9.x86_64                                                          2/4
  Running scriptlet: iscsi-initiator-utils-6.2.1.9-1.gita65a472.el9.x86_64                                                           3/4
  Cleanup          : iscsi-initiator-utils-6.2.1.9-1.gita65a472.el9.x86_64                                                           3/4
  Running scriptlet: iscsi-initiator-utils-6.2.1.9-1.gita65a472.el9.x86_64                                                           3/4
  Running scriptlet: iscsi-initiator-utils-iscsiuio-6.2.1.9-1.gita65a472.el9.x86_64                                                  4/4
  Cleanup          : iscsi-initiator-utils-iscsiuio-6.2.1.9-1.gita65a472.el9.x86_64                                                  4/4
  Running scriptlet: iscsi-initiator-utils-iscsiuio-6.2.1.9-1.gita65a472.el9.x86_64                                                  4/4
  Verifying        : iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el9.x86_64                                                          1/4
  Verifying        : iscsi-initiator-utils-6.2.1.9-1.gita65a472.el9.x86_64                                                           2/4
  Verifying        : iscsi-initiator-utils-iscsiuio-6.2.1.11-0.git4b3e853.el9.x86_64                                                 3/4
  Verifying        : iscsi-initiator-utils-iscsiuio-6.2.1.9-1.gita65a472.el9.x86_64             								     4/4
Installed products updated.

Upgraded:
  iscsi-initiator-utils-6.2.1.11-0.git4b3e853.el9.x86_64    iscsi-initiator-utils-iscsiuio-6.2.1.11-0.git4b3e853.el9.x86_64

Complete!

Configuración del Initiator

Comprobar el IQN del Initiator:

[root@nodo1 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2026-01.icecube:node01.initiator01

Editar el archivo de configuración CHAP:

[root@nodo1 ~]# vim  /etc/iscsi/iscsid.conf

Verificar parámetros de autenticación:

[root@nodo1 ~]# grep -i node.session.auth /etc/iscsi/iscsid.conf|grep -v ^#
node.session.auth.authmethod = CHAP
node.session.auth.username = bonzo
node.session.auth.password = PASSWORD2020

[root@nodo1 ~]# systemctl enable --now iscsid
Created symlink /etc/systemd/system/multi-user.target.wants/iscsid.service → /usr/lib/systemd/system/iscsid.service.

[root@nodo1 ~]# systemctl restart iscsid

Descubrimiento y conexión al target

Descubrir targets disponibles:

[root@nodo1 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.1.80
192.168.1.80:3260,1 iqn.2027-04.icecube:storage.target00

Iniciar sesión:

[root@nodo1 ~]#  iscsiadm -m node --login
Login to [iface: default, target: iqn.2026-01.icecube:storage.target01, portal: 192.168.1.80,3260] successful.

Verificación del disco compartido

Comprobar que el nuevo disco aparece en el sistema:

[root@nodo1 ~]# iscsiadm -m session -o show
tcp: [1] 192.168.1.80:3260,1 iqn.2026-01.icecube:storage.target01 (non-flash)

[root@nodo1 ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0 10.5G  0 disk
├─sda1            8:1    0    1G  0 part /boot
└─sda2            8:2    0  9.5G  0 part
  ├─centos-root 253:0    0  8.4G  0 lvm  /
  └─centos-swap 253:1    0    1G  0 lvm  [SWAP]
sdb               8:16   0    8G  0 disk
sr0              11:0    1 1024M  0 rom

Pacemaker

Instalación

PACEMAKER RHEL9

[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.

[root@nodo1 ~]# dnf install -y pacemaker pcs fence-agents-all lvm2
[root@nodo2 ~]# dnf install -y pacemaker pcs fence-agents-all lvm2

Configuración Cluster

[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 ~]#

[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 ~]#

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

[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 ~]#

[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 ~]#

[root@nodo2 ~]# pcs status
Error: error running crm_mon, is pacemaker running?
  crm_mon: Connection to cluster failed: Connection refused

[root@nodo2 ~]# pcs cluster start --all
nodo1: Starting Cluster...
nodo2: Starting Cluster...

[root@nodo2 ~]# pcs cluster enable --all
nodo1: Cluster Enabled
nodo2: Cluster Enabled

[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

[root@nodo2 ~]# pcs property set stonith-enabled=false

[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 ~]#

Configuración LVM

Crear VG con el disco compartido:

[root@nodo1 ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.

[root@nodo1 ~]# vgcreate vg_shared /dev/sdb
  Physical volume "/dev/sdb" successfully created.
  Volume group "vg_shared" successfully created

[root@nodo1 ~]# lvcreate -n lv_data -l 100%FREE vg_shared
  Logical volume "lv_data" created.

[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 ~]#

Notas finales

• El disco iSCSI queda disponible para ser utilizado como recurso compartido en Pacemaker
• Todos los nodos deben ver el mismo dispositivo
• A partir de este punto se puede continuar con la configuración del clúster