//首先在SERVER端操作
[root@server ~]# yum -y install targetd targetcli
[root@server ~]# systemctl start target
[root@server ~]# systemctl enable target
Created symlink from /etc/systemd/system/multi-user.target.wants/target.service
to /usr/lib/systemd/system/target.service.
[root@server ~]# systemctl status target
● target.service - Restore LIO kernel target configuration
Loaded: loaded (/usr/lib/systemd/system/target.service; enabled; vendor
preset: disabled)
Active: active (exited) since Sat 2020-05-09 18:12:28 CST; 9s ago
Main PID: 17317 (code=exited, status=0/SUCCESS)
...
//设置防火墙
[root@server ~]# firewall-cmd --add-port=3260/tcp --permanent
success
[root@server ~]# firewall-cmd --reload
success
[root@server ~]# firewall-cmd --list-ports
3260/tcp
//执行targetcli工具
基本思路：
先把准备共享的块做出来，创建一个target，在target上创建LUN，一个LUN连接一个块。
// 注意，执行完targetcli命令以后，出错，是因为缺少包导致的，需要下载一个包。
yum install python-rtslib -y
[root@server ~]# targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.
targetcli shell version 2.1.fb49
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/> ls
o- / ........................................................... [...]
o- backstores ................................................ [...]
| o- block .................................... [Storage Objects: 0]
| o- fileio ................................... [Storage Objects: 0]
| o- pscsi .................................... [Storage Objects: 0]
| o- ramdisk .................................. [Storage Objects: 0]
o- iscsi .............................................. [Targets: 0]
o- loopback ........................................... [Targets: 0]
Server端
1、指定要发布的磁盘（块设备LUN）
/> /backstores/block create server0.disk1 /dev/sdc
Created block storage object server0.disk1 using /dev/sdc.
2、创建iqn名字即创建ISCSI对象。
/> /iscsi create iqn.2020-05.com.bdqn:disk1
Created target iqn.2020-05.com.bdqn:disk1.
Created TPG 1.
Global pref auto_add_default_portal=true
Created default portal listening on all IPs (0.0.0.0), port 3260.
3、设置ACL即将ISCSI对象与客户端IP或主机名绑定
/> /iscsi/iqn.2020-05.com.bdqn:disk1/tpg1/acls create iqn.2020-
05.com.bdqn:client1
Created Node ACL for iqn.2020-05.com.bdqn:client1
4、创建LUN并绑定块
/> /iscsi/iqn.2020-05.com.bdqn:disk1/tpg1/luns create
/backstores/block/server0.disk1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2020-05.com.bdqn:client1
Client端
1、安装工具
[root@client ~]# yum -y install iscsi-initiator-util
2、给initiator命名
[root@client ~]# vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2020-05.com.bdqn:client1
3、启动服务
[root@client ~]# systemctl start iscsi
[root@client ~]# systemctl enable iscsi
[root@client ~]# systemctl status iscsi
● iscsi.service - Login and scanning of iSCSI devices
Loaded: loaded (/usr/lib/systemd/system/iscsi.service; enabled; vendor preset:
disabled)
Active: inactive (dead)
Condition: start condition failed at Sat 2020-05-09 19:23:49 CST; 10s ago
Docs: man:iscsiadm(8)
man:iscsid(8)
4、发现存储
[root@client ~]# iscsiadm -m discovery -t st -p 192.168.1.60
192.168.1.60:3260,1 iqn.2020-05.com.bdqn:disk1
5、登录存储/连接target
[root@client ~]# iscsiadm -m discovery -t st -p 192.168.1.60 -l
192.168.1.60:3260,1 iqn.2020-05.com.bdqn:disk1
Logging in to [iface: default, target: iqn.2020-05.com.bdqn:disk1, portal:
192.168.1.60,3260] (multiple)
Login to [iface: default, target: iqn.2020-05.com.bdqn:disk1, portal:
192.168.1.60,3260] successful.
6、验证iscsi连接，查看是否得到外界硬盘
[root@client ~]# lsscsi
[0:0:0:0] disk VMware, VMware Virtual S 1.0 /dev/sda
[2:0:0:0] cd/dvd NECVMWar VMware IDE CDR10 1.00 /dev/sr0
[3:0:0:0] disk LIO-ORG server0.disk1 4.0 /dev/sdb
//然后就可以像操作本地磁盘一样来操作iscsi磁盘了。
[root@client ~]# gdisk /dev/sdb
...
Number Start (sector) End (sector) Size Code Name
1 2048 10487807 5.0 GiB 8300 Linux filesystem
2 10487808 20971486 5.0 GiB 8300 Linux filesystem
[root@client ~]# partprobe /dev/sdb
[root@client ~]# partprobe /dev/sdb
[root@client ~]# partprobe /dev/sdb
[root@client ~]# cat /proc/partitions
major minor #blocks name
...
8 16 10485760 sdb
8 17 5242880 sdb1
8 18 5241839 sdb2
//这里将/dev/sdb1分区挂载到/mnt/iscsi目录中使用。
[root@client ~]# mkdir /mnt/iscsi
[root@client ~]# mkfs.xfs /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=327680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=1310720, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@client ~]# mount /dev/sdb1 /mnt/iscsi/
[root@client ~]# mount | tail -1
/dev/sdb1 on /mnt/iscsi type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
[root@client ~]# df -hT /mnt/iscsi/
Filesystem Type Size Used Avail Use% Mounted on
/dev/sdb1 xfs 5.0G 33M 5.0G 1% /mnt/iscsi
//如果加入开机自动挂载，需要在挂载选项中添加_netdev 选项。
[root@client ~]# vim /etc/fstab
...
/dev/sdb1 /mnt/iscsi xfs defaults,_netdev 0 0
[root@client ~]# mount -a
再次提醒:iscsi，网络存储，经过网络，那么就必须要注意安全。这里注意是以防火墙来体现安全。
可以再开一台虚拟机。当做iscsi客户端，看看是否能够发现iscsi存储。
[root@work ~]# yum install iscsi*
[root@work ~]# systemctl start iscsi
[root@work ~]# iscsiadm -m discovery -t st -p 192.168.1.60
192.168.1.60:3260,1 iqn.2020-05.com.bdqn:disk1
