iscsi使用教程（下）

动态创建目标

安装iscsi服务端

# yum install -y scsi-target-utils.x86_64

修改配置文件

# mkdir -p ~/volumes

# sed -i '$ i include /root/volumes/*' /etc/tgt/tgtd.conf

启动服务

### 有告警是正常的，因为我们现在还没配置目标

# tgtd -f --iscsi portal=92.0.0.14:3260

tgtd: iser_ib_init(3436) Failed to initialize RDMA; load kernel modules?

tgtd: work_timer_start(146) use timer_fd based scheduler

tgtd: bs_init_signalfd(267) could not open backing-store module directory /usr/lib64/tgt/backing-store

tgtd: bs_init(386) use signalfd notification

新增磁盘并创建LV

# pvcreate /dev/sda

# vgcreate cinder-volumes /dev/sda

# lvcreate -n vol cinder-volumes -L 1g

创建目标配置文件

# tee /root/volumes/vol.conf << EOF

<target iqn.2010-10.org.openstack:vol>

    backing-store /dev/cinder-volumes/vol

    driver iscsi

    write-cache on

</target>

EOF

动态更新目标

# tgt-admin --update iqn.2010-10.org.openstack:vol

查询目标信息

# tgtadm --lld iscsi --op show --mode target

Target 1: iqn.2010-10.org.openstack:vol

    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: 1074 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: /dev/cinder-volumes/vol

            Backing store flags:

    ### 允许连接的客户端用户名

    Account information:

    ### 允许连接的客户端地址

    ACL information:

        ALL

安装客户端

# yum install iscsi-initiator-utils.x86_64 -y

发现目标

# iscsiadm -m discovery -t sendtargets -p 92.0.0.14

92.0.0.14:3260,1 iqn.2010-10.org.openstack:vol

连接目标

# iscsiadm -m node -T iqn.2010-10.org.openstack:vol -p 92.0.0.14 -l

Logging in to [iface: default, target: iqn.2010-10.org.openstack:vol, portal: 92.0.0.14,3260] (multiple)

Login to [iface: default, target: iqn.2010-10.org.openstack:vol, portal: 92.0.0.14,3260] successful.

# iscsiadm -m session

tcp: [1] 92.0.0.14:3260,1 iqn.2010-10.org.openstack:vol (non-flash)

断开连接

# iscsiadm -m node -T iqn.2010-10.org.openstack:vol -p 92.0.0.14 -u

Logging out of session [sid: 2, target: iqn.2010-10.org.openstack:vol, portal: 92.0.0.14,3260]

Logout of [sid: 2, target: iqn.2010-10.org.openstack:vol, portal: 92.0.0.14,3260] successful.

# iscsiadm -m session

iscsiadm: No active sessions.