Diferencia entre revisiones de «ISCSI»

Revisión del 07:11 3 ene 2026

Introducción

El protocolo iSCSI es un protocolo que proporciona acceso a dispositivos de bloques a través de la red utilizando TCP/IP. A diferencia de otros protocolos de compartición de archivos como NFS o Samba, iSCSI no ofrece ficheros ni directorios, sino acceso directo a dispositivos de bloques completos.

Esto significa que, desde el punto de vista del sistema cliente, el recurso iSCSI se comporta como un disco duro local. El dispositivo se presenta en bruto, sin necesidad de tabla de particiones ni sistema de ficheros, ya que estas tareas quedan bajo el control del cliente que accede al dispositivo.

Una de las características más relevantes de iSCSI es que permite que un mismo dispositivo de bloques sea accedido de forma simultánea por varios clientes. Aunque esto puede provocar problemas de concurrencia si no se gestiona adecuadamente (algo que debe resolverse a otro nivel), el protocolo lo soporta de forma nativa. Todo ello lo convierte en una alternativa mucho más económica frente a tecnologías como Fibre Channel, manteniendo compatibilidad con la mayoría de sistemas operativos actuales.

El protocolo iSCSI se utiliza habitualmente en redes de almacenamiento, donde se busca aislar el tráfico de datos y proporcionar un entorno más seguro. Además, iSCSI incorpora sus propios mecanismos de autenticación y control de acceso, como se verá a lo largo de este laboratorio.

Antes de comenzar con la configuración práctica, es importante familiarizarse con la terminología básica asociada a este protocolo.

Terminología básica

Unidad lógica (LUN): Dispositivo de bloques que se comparte desde el servidor iSCSI. Puede tratarse de discos duros,

 particiones o volúmenes lógicos.

Target: Recurso exportado por el servidor iSCSI que contiene una o varias LUN. Un cliente se conecta a un target

 mediante una única sesión y puede acceder a todos los dispositivos asociados a él.

Initiator: Cliente iSCSI que establece la conexión con el target para acceder a los dispositivos de bloques compartidos.

Multipath: Mecanismo que permite garantizar la disponibilidad del dispositivo remoto cuando existen múltiples rutas

 entre el initiator y el target. Si una ruta falla, el acceso se mantiene a través de otra.

IQN: Identificador único utilizado para nombrar recursos iSCSI. Sigue el formato

 iqn.año-mes.dominio_invertido:nombre.
 

 Ejemplo:
 iqn.2021-02.com.alvarovf:target1

iSNS: Protocolo que permite gestionar y descubrir recursos iSCSI de forma centralizada,

 de manera similar a Fibre Channel.

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

Configuración alternativa del Target (tgt)

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

Configurar el archivo /etc/tgt/targets.conf:

[root@icecube ~]# cat  /etc/tgt/targets.conf |grep -v ^#
default-driver iscsi

<target iqn.2027-04.icecube:storage.target00>
    backing-store /var/lib/iscsi_disks/disk01.img
    initiator-address 192.168.0.81
    initiator-address 192.168.0.82
    incominguser bonzo PASSWORD2020
</target>

Iniciar y habilitar el servicio:

[root@icecube ~]#  systemctl start tgtd
[root@icecube ~]# systemctl enable tgtd
Created symlink from /etc/systemd/system/multi-user.target.wants/tgtd.service to /usr/lib/systemd/system/tgtd.service.
[root@icecube ~]#

Verificación del target:

[root@icecube ~]# tgtadm --mode target --op show
Target 1: iqn.2027-04.icecube:storage.target00
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            SWP: No
            Thin-provisioning: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 8590 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            SWP: No
            Thin-provisioning: No
            Backing store type: rdwr
            Backing store path: /var/lib/iscsi_disks/disk01.img
            Backing store flags:
    Account information:
        bonzo
    ACL information:
        192.168.0.81
        192.168.0.82

Configuración del iSCSI Initiator en los nodos

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

Instalación de paquetes

yum --enablerepo=epel install -y \
scsi-target-utils \
iscsi-initiator-utils

Configuración del iniciador

Comprobar el IQN del iniciador:

[root@nodo1 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2027-04.icecube:www.icecube

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

Descubrimiento y conexión al target

Descubrir targets disponibles:

[root@nodo1 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.0.80
192.168.0.80:3260,1 iqn.2027-04.icecube:storage.target00

[root@nodo1 ~]# iscsiadm -m node -o show
# BEGIN RECORD 6.2.0.874-19
node.name = iqn.2027-04.icecube:storage.target00
node.tpgt = 1
node.startup = automatic
node.leading_login = No
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <empty>
iface.gateway = <empty>
iface.subnet_mask = <empty>
iface.transport_name = tcp
iface.initiatorname = <empty>
iface.state = <empty>
iface.vlan_id = 0
iface.vlan_priority = 0
iface.vlan_state = <empty>
iface.iface_num = 0
iface.mtu = 0
iface.port = 0
iface.bootproto = <empty>
iface.dhcp_alt_client_id_state = <empty>
iface.dhcp_alt_client_id = <empty>
iface.dhcp_dns = <empty>
iface.dhcp_learn_iqn = <empty>
iface.dhcp_req_vendor_id_state = <empty>
iface.dhcp_vendor_id_state = <empty>
iface.dhcp_vendor_id = <empty>
iface.dhcp_slp_da = <empty>
iface.fragmentation = <empty>
iface.gratuitous_arp = <empty>
iface.incoming_forwarding = <empty>
iface.tos_state = <empty>
iface.tos = 0
iface.ttl = 0
iface.delayed_ack = <empty>
iface.tcp_nagle = <empty>
iface.tcp_wsf_state = <empty>
iface.tcp_wsf = 0
iface.tcp_timer_scale = 0
iface.tcp_timestamp = <empty>
iface.redirect = <empty>
iface.def_task_mgmt_timeout = 0
iface.header_digest = <empty>
iface.data_digest = <empty>
iface.immediate_data = <empty>
iface.initial_r2t = <empty>
iface.data_seq_inorder = <empty>
iface.data_pdu_inorder = <empty>
iface.erl = 0
iface.max_receive_data_len = 0
iface.first_burst_len = 0
iface.max_outstanding_r2t = 0
iface.max_burst_len = 0
iface.chap_auth = <empty>
iface.bidi_chap = <empty>
iface.strict_login_compliance = <empty>
iface.discovery_auth = <empty>
iface.discovery_logout = <empty>
node.discovery_address = 192.168.0.80
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.nr_sessions = 1
node.session.auth.authmethod = CHAP
node.session.auth.username = bonzo
node.session.auth.password = ********
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.auth.chap_algs = MD5
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.tgt_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.session.scan = auto
node.conn[0].address = 192.168.0.80
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxXmitDataSegmentLength = 0
node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
node.conn[0].iscsi.HeaderDigest = None
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD

Iniciar sesión:

[root@nodo1 ~]#  iscsiadm -m node --login

Verificar la sesión activa:

[root@nodo1 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.0.80
192.168.0.80:3260,1 iqn.2027-04.icecube:storage.target00

Verificación del disco compartido

Comprobar que el nuevo disco aparece en el sistema:

[root@nodo1 ~]# iscsiadm -m session -o show
tcp: [1] 192.168.0.80:3260,1 iqn.2027-04.icecube:storage.target00 (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

Inicializar el disco como volumen físico:

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

Diferencia entre revisiones de «ISCSI»

Revisión del 07:11 3 ene 2026

Sumario

Introducción

Terminología básica

Configuración del almacenamiento SAN

Instalación de paquetes requeridos

Configuración del iSCSI Target (targetcli)

Configuraciones previas:

Configurar el Target

Comprobación del servicio iSCSI

Configuración SELinux del Target

Configuración del iSCSI Initiator en los nodos

Instalación de paquetes

Configuración del Initiator

Descubrimiento y conexión al target

Verificación del disco compartido

Configuración alternativa del Target (tgt)

Configuración del iSCSI Initiator en los nodos

Instalación de paquetes

Configuración del iniciador

Descubrimiento y conexión al target

Verificación del disco compartido

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