iSCSI 구성 방법¶

iSCSI Target 설치¶

1. yum install targetcli
2. systemctl enable target --now

Target 설정¶

1. targetcli
2. backstore/block/ create dev=/dev/mapper/maptha name=lun0
3. iscsi/ create wwn=iqn.2025-10.xxx.yyy
4. iscsi/iqn.2025-10.xxx.yyy/tpg1/luns create /backstores/block/lun0
5. iscsi/iqn.2025-10.xxx.yyy/tpg1/portals create 서비스IP ip_port=포트번호

DRBD + iSCSI 구성 방법¶

iSCSI Target 설치¶

1. yum install targetcli
2. systemctl enable target --now

DRBD 설치¶

다운로드¶

1. wget https://linbit.gateway.scarf.sh//downloads/drbd/9/drbd-9.2.14.tar.gz
2. wget https://linbit.gateway.scarf.sh//downloads/drbd/utils/drbd-utils-9.32.0.tar.gz
3. tar -xvf drbd-9.2.14.tar.gz
4. tar -xvf drbd-utils-9.32.0.tar.gz

DRBD 빌드 및 설치¶

1. yum install -y kernel-devel kernel-headers gcc flex
2. cd drbd-9.2.14
3. make
4. make install
5. modprobe drbd
6. cd -

DRBD util 빌드 및 설치¶

1. cd drbd-utils-9.32.0
2. ./configure
3. make
   • Userland tools build was successful 나오면 빌드 자체는 성공
4. make install

DRBD 구성¶

모든 노드에서 vim /usr/local/etc/drbd.d/test.res 아래 내용 작성

resource test {
    protocol C;
    startup {
        wfc-timeout       0;      ## Infinite!
        degr-wfc-timeout  120;    ## 2 minutes.
    }   
    disk {
        on-io-error detach;
        resync-rate 300M;
    }   
    net {
        timeout             30;     #  3 seconds  (unit = 0.1 seconds)
        connect-int         5;     # 5 seconds  (unit = 1 second)
        ping-int            5;     # 5 seconds  (unit = 1 second)
        max-buffers         20000;
        max-epoch-size      20000;
    }   

    on iSCSITest-1 {
        device /dev/drbd1;
        disk /dev/sdb;
        address 31.31.31.1:7788;
        meta-disk internal;
    }   
    on iSCSITest-2 {
        device /dev/drbd1;
        disk /dev/sdb;
        address 31.31.31.2:7788;
        meta-disk internal;
    }   
}

1. 모든 노드에서 drbdadm create-md test
2. 모든 노드에서 drbdadm up test
3. 1번 노드에서 drbdadm primary test --force

Pacemaker 구성¶

Web-UI 에서 service 템플릿까지 생성 후 진행

# 템플릿 생성 후 환경

 Clone Set: rsc_bond1-group-clone [rsc_bond1-group]
     Started: [ iSCSItest-1 iSCSItest-2 ]
 Clone Set: Service-group-clone [Service-group]
     Started: [ iSCSItest-1 iSCSItest-2 ]
 Resource Group: VIP-group-1
     vip_32.32.32.1     (ocf::heartbeat:IPaddr2):       Started iSCSItest-2

리소스 생성¶

1. pcs resource create drbd ocf:linbit:drbd drbd_resource=test ignore_missing_notifications=true drbdconf='/usr/local/etc/drbd.conf'
2. pcs resource create target ocf:heartbeat:iSCSITarget iqn='iqn.2025-09.com.test' portals='32.32.32.1:1444'
3. pcs resource create lun0 ocf:heartbeat:iSCSILogicalUnit lun=0 path=/dev/drbd1 target_iqn=iqn.2025-09.com.test

그룹화¶

1. pcs resource master drbd
   • 이때 생성되는 Master/Slave 클론은 drbd-master
2. pcs resource group add iscsi target lun0

제약조건 추가¶

1. pcs constraint colocation add started VIP-group-1 with master drbd-master
   • VIP 그룹이 올라가 있는 노드가 Master
2. pcs constraint colocation add master drbd-master with started iscsi
   • drbd Master 노드에서 iscsi target 제공

최종 구성¶

[root@iSCSItest-2 ~]# pcs status
Cluster name: iSCSItest
Stack: corosync
Current DC: iSCSItest-1 (version 2.0.0-4.el7-8cf3fe749e) - partition with quorum
Last updated: Mon Sep 22 17:31:27 2025
Last change: Mon Sep 22 17:29:15 2025 by root via cibadmin on iSCSItest-1

2 nodes configured
15 resources configured

Online: [ iSCSItest-1 iSCSItest-2 ]

Full list of resources:

 Clone Set: rsc_bond1-group-clone [rsc_bond1-group]
     Started: [ iSCSItest-1 iSCSItest-2 ]
 Clone Set: Service-group-clone [Service-group]
     Started: [ iSCSItest-1 iSCSItest-2 ]
 Resource Group: VIP-group-1
     vip_32.32.32.1     (ocf::heartbeat:IPaddr2):       Started iSCSItest-2
 Master/Slave Set: drbd-master [drbd]
     Masters: [ iSCSItest-2 ]
     Slaves: [ iSCSItest-1 ]
 Resource Group: iscsi
     target     (ocf::heartbeat:iSCSITarget):   Started iSCSItest-2
     lun0       (ocf::heartbeat:iSCSILogicalUnit):      Started iSCSItest-2

standby / unstandby 확인 완료

추가 고려 사항¶

DRBD를 사용하지 않을 경우¶

• 위에서 DRBD 와 관련된 내용을 수행하지 하지 않음
• ocf:heartbeat:iSCSILogicalUnit 리소스 에이전트 생성시 path 값을 SAN에서 받아온 LUN 경로로 변경

DRBD + LVM 환경 설정 시¶

현재 Web-UI 에서는 설정 불가
추가적인 constraint 설정 필요 할 것으로 예상됨

1. pcs constraint colocation add master drbd-master with started Filesystem_RA