一、搭建iscsi存储服务
安装target
[root@localhost wuqiong]# yum install -y scsi-target-utils [root@localhost wuqiong]# ls /etc/tgt/targets.conf /etc/tgt/targets.conf[root@localhost wuqiong]# /etc/init.d/tgtd start[root@localhost wuqiong]# systemctl start tgtd.service [root@localhost wuqiong]# systemctl status tgtd.service [root@localhost wuqiong]# systemctl restart tgtd.service
新建存储分区： sda4
[root@localhost wuqiong]# fdisk -l Disk /dev/sda: 107.4 GB, 107374182400bytes 255heads, 63sectors/track, 13054cylinders Units =cylinders of 16065* 512=8225280bytes Sector size (logical/physical): 512bytes / 512bytes I/O size (minimum/optimal): 512bytes / 512bytes Disk identifier: 0x000b076e Device Boot Start End Blocks Id System /dev/sda1 * 1 26 204800 83Linux Partition 1does not end on cylinder boundary. /dev/sda2 26 287 2097152 82Linux swap / Solaris
[root@localhost wuqiong]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m forhelp): p
Disk /dev/sda: 107.4 GB, 107374182400bytes
255heads, 63sectors/track, 13054cylinders
Units =cylinders of 16065* 512=8225280bytes
Sector size (logical/physical): 512bytes / 512bytes
I/O size (minimum/optimal): 512bytes / 512bytes
Disk identifier: 0x000b076e
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83Linux
Partition 1does not end on cylinder boundary.
/dev/sda3 287 13055 102554624 83Linux
Command (m forhelp): n
Command action
e extended
p primary partition (1-4)
## 选（p）
Selected partition 4
First cylinder (1428-2610, default 1428):
Using default value 1428
Last cylinder, +cylinders or +size{K,M,G} (1428-2610, default 2610):
Command (m forhelp): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@docker-02 ~]# reboot [root@docker-02 ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400bytes
255heads, 63sectors/track, 13054cylinders
Units =cylinders of 16065* 512=8225280bytes
Sector size (logical/physical): 512bytes / 512bytes
I/O size (minimum/optimal): 512bytes / 512bytes
Disk identifier: 0x000b076e
Device Boot Start End Blocks Id System
/dev/sda1 * 1 26 204800 83Linux
Partition 1does not end on cylinder boundary.
/dev/sda3 287 13055 102554624 83Linux
/dev/sda4 26 286 2091471 83Linux
Partition table entries are not indisk order
配置sda4共享
[root@docker-02 ~]# vim /etc/tgt/targets.conf 75#<target iqn.2008-09.com.example:server.target4> 76# direct-store /dev/sdb # Becomes LUN 1 77# direct-store /dev/sdc # Becomes LUN 2 78# direct-store /dev/sdd # Becomes LUN 3 79# write-cache off 80# vendor_id MyCompany Inc. 81#</target>
在上面内容后面新增以下内容：
<target iqn.2018-01.cn.docker:target_san1>
backing-store /dev/sda4
initiator-address 192.168.80.0/24 vendor_id docker
product_id target1
</target>
注释：
default-driver iscsi #此配置文件默认全部注释，使用iscsi驱动
<tarrget iqn.2018-1.cn.docker:target_san1> # iscsi正规名字格式：iqn.年－月.主机名倒着写: target端名字
backing-store /dev/sda4 #可以是具体的分区，也可以是DD出来的文件。不能小于5G。（后面的文件系统是GFS，光日志空间就128M）
initiator-address 192.168.80.0 #指定允许访问的此存储主机
vendor_id “docker” #vendor是供应厂商编号标识这个设备（字符不要过长）
product_id "TARGET1" # 产品编号
</target>
启动服务
[root@localhost wuqiong]#systemctl start tgtd service [root@localhost wuqiong]#tgt-admin --show
二、配置客户端
安装服务
[root@localhost wuqiong]# yum install -y iscsi-initiator-utils [root@localhost wuqiong]# service iscsid restart [root@localhost wuqiong]# /etc/init.d/iscsid status iscsid (pid 1553) 正在运行...
target存储服务器信息在客户端存储的位置
[root@localhost wuqiong]# yum install -y tree ##安装tree命令，用于查询树 [root@localhost wuqiong]# tree /var/lib/iscsi/ ##发现target后，会在此目录先生成树结构 /var/lib/iscsi/ ├── ifaces ├── isns ├── nodes │ └── iqn.2018-01.cn.docker:target_san1 │ └── 172.17.1.151,3260,1 │ └── default ├── send_targets │ └── 172.17.1.151,3260 │ ├── iqn.2018-01.cn.docker:target_san1,172.17.1.151,3260,1,default -> /var/lib/iscsi/nodes/iqn.2018-01.cn.docker:target_san1/172.17.1.151,3260,1 │ └── st_config ├── slp └── static10directories, 2files
客户端服务启动关系
先启动iscsid，再启动iscsi，iscsi是根据/var/lib/iscsi/中发现的信息，识别设备。
查看发现到新硬盘以及卸载，挂载存储设备
[root@localhost wuqiong]# ll /dev/sdb brw-rw---- 1root disk 8, 169月 2916:51 /dev/sdb ##卸载 [root@docker-03 opt]# iscsiadm -m node -T iqn.2018-01.cn.docker:target_san1 -u ##登录存储存储设备 [root@docker-03 opt]# iscsiadm -m node -T iqn.2018-01.cn.docker:target_san1 -l
在192.168.80.0上对识别出来的硬盘，分区格式化，挂载使用。
[root@localhost wuqiong]# iscsiadm -m discovery -t sendtargets -p 172.17.1.151:3260 ##发现存储设备
[root@localhost wuqiong]# service iscsid restart ##登录存储
[root@localhost wuqiong]# service iscsi restart
[root@localhost wuqiong]# ll /dev/sdb
brw-rw---- 1root disk 8, 169月 2916:51 /dev/sdb
[root@docker-03 opt]# fdisk /dev/sdb ##划分一个分区当作本地盘使用即可
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m forhelp): p
Disk /dev/sdb: 2141MB, 2141666304bytes
66heads, 62sectors/track, 1022cylinders
Units =cylinders of 4092* 512=2095104bytes
Sector size (logical/physical): 512bytes / 512bytes
I/O size (minimum/optimal): 512bytes / 512bytes
Disk identifier: 0x4c80a2ad
Device Boot Start End Blocks Id System
/dev/sdb1 1 1022 2090981 83Linux
Command (m forhelp): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4):
Value out of range.
Partition number (1-4):
Value out of range.
Partition number (1-4): 1
##以下回车之后w保存
[root@localhost wuqiong]# ll /dev/sdb* ##查看分区
brw-rw---- 1root disk 8, 169月 2917:06 /dev/sdb
brw-rw---- 1root disk 8, 179月 2917:06 /dev/sdb1
[root@dlocalhost wuqiong]# mkfs.ext4 /dev/sdb1 ##格式化分区
[root@localhost wuqiong]# mount /dev/sdb1 /opt/ ##挂载使用
[root@localhost wuqiong]# cp /etc/passwd /opt/ ##测试文件写入
[root@localhost wuqiong]# cd /opt/
[root@localhost wuqiong]# ls
lost+found passwd
测试： 192.168.80.0挂载上硬盘，数据同步
[root@docker-01 opt]# yum -y install iscsi-initiator-utils [root@docker-01 opt]# iscsiadm -m discovery -t sendtargets -p 172.17.1.151:3260 [root@docker-01 opt]# service iscsid restart [root@docker-01 opt]# service iscsi restart [root@docker-01 opt]# ls /dev/sdb* /dev/sdb /dev/sdb1 [root@docker-01 opt]# mount /dev/sdb1 /opt/ [root@docker-01 opt]# ls /opt/ ##可以看到数据已经同步过来了 lost+found passwd 添加新数据测试同步： [root@localhost wuqiong]# cp /etc/sysconfig/network /opt/ [root@localhost wuqiong]# ls /opt/ lost+found network passwd 172.17.1.152上查看： [root@localhost wuqiong]# ls lost+found passwd