Pacemaker
De jagfloriano.com
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
- Icecube —
- Nodos Pacemaker
- Nodo1 —
192.168.1.81 - Nodo2 —
192.168.1.82
- Nodo1 —
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 físico:
[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
