手动模拟attach cinder volume的过程

我们首先启动一台机器，启动的时候attach一个volume

创建一个空的cinder volume

root:~# cinder create --display-name emptyvolume11g 11
+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
| availability_zone |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2014-07-01T22:22:22.802708      |
| display_description |                 None                 |
|     display_name    |            emptyvolume11g            |
|      encrypted      |                False                 |
|          id         | f6ba87f7-d0b6-4fdb-ac82-346371e78c48 |
|       metadata      |                  {}                  |
|         size        |                  11                  |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |                 None                 |
+---------------------+--------------------------------------+

nova --debug boot --flavor 2 --image d96b0e41-8264-41de-8dbb-6b31ce9bfbfc --key-name openstack --security-groups default --block-device source=volume,id=f6ba87f7-d0b6-4fdb-ac82-346371e78c48,dest=volume,shutdown=preserve myInstanceWithVolume

如果我们ssh到虚拟机里面可以看到attached volume

root@myinstancewithvolume:/home/ubuntu# fdisk -l

Disk /dev/vda: 21.5 GB, 21474836480 bytes
4 heads, 32 sectors/track, 327680 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c917a

Device Boot Start End Blocks Id System
/dev/vda1 * 2048 41943039 20970496 83 Linux

Disk /dev/vdb: 11.8 GB, 11811160064 bytes
16 heads, 63 sectors/track, 22885 cylinders, total 23068672 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/vdb doesn't contain a valid partition table

通过virsh dumpxml，也可以看到

在cinder volume节点上可以看到Logic volume

root# lvdisplay
--- Logical volume ---
LV Path                /dev/cinder-volumes/volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
LV Name                volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
VG Name                cinder-volumes
LV UUID                PKRR9B-nUCI-Ob1Y-U97W-b1Rh-RhuH-Ow4h5P
LV Write Access        read/write
LV Creation host, time escto-bj-hp-z620, 2014-07-02 06:22:23 +0800
LV snapshot status     source of
                         _snapshot-138e677d-721a-435e-b945-fbd6009f3b2a [active]
LV Status              available
# open                 1
LV Size                11.00 GiB
Current LE             2816
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:2
--- Logical volume ---
LV Path                /dev/cinder-volumes/_snapshot-138e677d-721a-435e-b945-fbd6009f3b2a
LV Name                _snapshot-138e677d-721a-435e-b945-fbd6009f3b2a
VG Name                cinder-volumes
LV UUID                uTu3GB-J1Nb-1G6Z-xroP-nUmk-394l-KHVYIk
LV Write Access        read/write
LV Creation host, time escto-bj-hp-z620, 2014-07-02 19:14:40 +0800
LV snapshot status     active destination for volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
LV Status              available
# open                 0
LV Size                11.00 GiB
Current LE             2816
COW-table size         11.00 GiB
COW-table LE           2816
Allocated to snapshot 0.00%
Snapshot chunk size    4.00 KiB
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:3

在cinder volume节点上用tgt查看iscsi target

root# tgtadm --mode target --op show
Target 1: iqn.2010-10.org.openstack:volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
        I_T nexus: 1
            Initiator: iqn.1993-08.org.debian:01:f7337e3e61e4 alias: escto-bj-hp-z620
            Connection: 0
                IP Address: 16.158.166.197
    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: 11811 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/volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
            Backing store flags:
    Account information:
    ACL information:
        ALL

下面我们手工attach一个volume

在cinder volume上创建一个iscsi target

tgtadm --lld iscsi --op new --mode target --tid 2 -T iqn.2010-10.org.openstack:volume-cliu8-test

创建一个Logic volume

lvcreate -L 14G -n lv_cliu8_test cinder-volumes
--- Logical volume ---
LV Path                /dev/cinder-volumes/lv_cliu8_test
LV Name                lv_cliu8_test
VG Name                cinder-volumes
LV UUID                Fg1uLV-Rdfc-p33c-1m03-GMrn-QgJ4-mpMelP
LV Write Access        read/write
LV Creation host, time escto-bj-hp-z620, 2014-07-02 23:20:27 +0800
LV Status              available
# open                 0
LV Size                14.00 GiB
Current LE             3584
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           252:6

将Logic Volume加入刚才创建的iscsi target

tgtadm --lld iscsi --op new --mode logicalunit --tid 2 --lun 1 -b /dev/cinder-volumes/lv_cliu8_test

Target 2: iqn.2010-10.org.openstack:volume-cliu8-test
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            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     00020001
            SCSI SN: beaf21
            Size: 15032 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/lv_cliu8_test
            Backing store flags:
    Account information:
    ACL information:

配置iscsi target监听链接

tgtadm --lld iscsi --op bind --mode target --tid 2 -I ALL

root@escto-bj-hp-z620:/var/lib/cinder/volumes# netstat -tulpn | grep 3260
tcp 0 0 0.0.0.0:3260 0.0.0.0:* LISTEN 22569/tgtd
tcp6 0 0 :::3260 :::* LISTEN 22569/tgtd

在虚拟机运行的节点上discover这个iscsi target

iscsiadm --mode discovery --type sendtargets --portal 16.158.166.197

root# iscsiadm --mode discovery --type sendtargets --portal 16.158.166.197
16.158.166.197:3260,1 iqn.2010-10.org.openstack:volume-f6ba87f7-d0b6-4fdb-ac82-346371e78c48
16.158.166.197:3260,1 iqn.2010-10.org.openstack:volume-cliu8-test

连接那个iscsi target

root# iscsiadm --mode node --targetname iqn.2010-10.org.openstack:volume-cliu8-test --portal 16.158.166.197:3260 --login
Logging in to [iface: default, target: iqn.2010-10.org.openstack:volume-cliu8-test, portal: 16.158.166.197,3260] (multiple)
Login to [iface: default, target: iqn.2010-10.org.openstack:volume-cliu8-test, portal: 16.158.166.197,3260] successful.

这个时候fdisk可以看到disk已经出现在host上了

Disk /dev/sdf: 15.0 GB, 15032385536 bytes
64 heads, 32 sectors/track, 14336 cylinders, total 29360128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdf doesn't contain a valid partition table

将这个disk attach到虚拟机上

root:~# virsh attach-disk instance-0000000b --source /dev/mapper/cinder--volumes-lv_cliu8_test --target vdc
Disk attached successfully

ssh到虚拟机里面，发现又多了一个disk

root@myinstancewithvolume:/home/ubuntu# fdisk -l

Device Boot Start End Blocks Id System
/dev/vda1 * 2048 41943039 20970496 83 Linux

Disk /dev/vdb: 11.8 GB, 11811160064 bytes
10 heads, 25 sectors/track, 92274 cylinders, total 23068672 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x72ab3546

Device Boot Start End Blocks Id System
/dev/vdb1 2048 23068671 11533312 83 Linux

Disk /dev/vdc: 15.0 GB, 15032385536 bytes
16 heads, 63 sectors/track, 29127 cylinders, total 29360128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/vdc doesn't contain a valid partition table

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手动模拟attach cinder volume的过程

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