本节主要是将rbd（也就是块存储），通过tgt映射为iscsi（也就是ip san），从而提供给其他系统使用。
1、安装需要的软件
#ceph-0002 apt-get install tgt apt-get install open-iscsi
2、查看tgt对rbd的支持情况
#ceph-0002 tgtadm --lld iscsi --op show --mode system System: State: ready debug: off LLDs: iscsi: ready iser: error Backing stores: sheepdog bsg sg null ssc smc (bsoflags sync:direct) mmc (bsoflags sync:direct) rdwr (bsoflags sync:direct) aio Device types: disk cd/dvd osd controller changer tape passthrough iSNS: iSNS=Off iSNSServerIP= iSNSServerPort=3205 iSNSAccessControl=Off
可见当前版本的tgt不支持直接使用rbd，所以要先将rbd映射为硬盘后，再进行处理。
3、创建并映射rbd设备
#ceph-0002 #创建块存储 rbd create --size 1024 rbd/r2 #禁用特性 rbd feature disable r2 object-map fast-diff deep-flatten #映射r2设备 rbd map r2 /dev/rbd0 #查看映射情况 rbd showmapped id pool image snap device 0 rbd r2 - /dev/rbd0
4、修改tgt配置文件
#ceph-0002
vim /etc/tgt/targets.conf
<target iqn.2020-06.com.neohope:iscsi="">
backing-store /dev/rbd0 #虚拟设备
initiator-address 192.168.1.0/24 #IP限制，请根据实际需要配置
# incominguser iuid ipwd #授权限制，请根据实际需要配置
write-cache off #关闭缓存，请根据实际需要配置
</target>
# 重启服务，配置生效
systemctl restart tgt.service
# 查看tgt情况
tgt-admin –-show
Target 1: iqn.2020-06.com.neohope:iscsi
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/rbd0
Backing store flags:
Account information:
ACL information:
192.168.1.0/24
5、挂载iscsi盘
#ceph-0004 #安装需要的软件 apt-get install open-iscsi #查看可用的iscsi服务 iscsiadm -m discovery -t sendtargets -p 192.168.1.102:3260 192.168.1.102:3260,1 iqn.2020-06.com.neohope:iscsi #登录，挂载iscsi盘 iscsiadm -m node -T iqn.2020-06.com.neohope:iscsi --login Logging in to [iface: default, target: iqn.2020-06.com.neohope:iscsi, portal: 192.168.1.102,3260] (multiple) Login to [iface: default, target: iqn.2020-06.com.neohope:iscsi, portal: 192.168.1.102,3260] successful.
6、使用iscsi盘
#ceph-0004 #查看硬盘，会发现多出一块 fdisk -l Disk /dev/vda: 40 GiB, 42949672960 bytes, 83886080 sectors Disk /dev/vdb: 20 GiB, 21474836480 bytes, 41943040 sectors Disk /dev/mapper/ceph--44634c9f--cf41--4215--bd5b--c2db93659bf1-osd--block--b192f8e5--55f2--4e75--a7ce--54d007410829: 20 GiB, 21470642176 bytes, 41934848 sectors Disk /dev/sda: 1 GiB, 1073741824 bytes, 2097152 sectors #查看sda硬盘情况 fdisk -l /dev/sda Disk /dev/sda: 1 GiB, 1073741824 bytes, 2097152 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 root@ceph-0004:/dev# fdisk -l /dev/sda Disk /dev/sda: 1 GiB, 1073741824 bytes, 2097152 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 #格式化 sudo mkfs.ext4 -m0 /dev/sda mke2fs 1.44.1 (24-Mar-2018) Creating filesystem with 262144 4k blocks and 65536 inodes Filesystem UUID: 42229c39-e23c-46b2-929d-469e66196498 Superblock backups stored on blocks: 32768, 98304, 163840, 229376 Allocating group tables: done Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: done #挂载 mount -t ext4 /dev/sda /mnt/iscsi #基本操作 cd /mnt/iscsi/ ls vi iscis.txt ls
7、卸载iscsi盘
#取消mount umount /mnt/iscsi #登出 iscsiadm -m node -T iqn.2020-06.com.neohope:iscsi --logout Logging out of session [sid: 1, target: iqn.2020-06.com.neohope:iscsi, portal: 192.168.1.102,3260] Logout of [sid: 1, target: iqn.2020-06.com.neohope:iscsi, portal: 192.168.1.102,3260] successful. #查看硬盘列表，会发现iscsi盘已经不见了 fdisk -l