要求：
在服务器端Server0上创建一个分区/dev/sdb1（无需格式化），配置成iscsi target设备，块设备名称为sun1，iqn名称为iqn.2018-01.com.ultrapower:testserverdisk1，并配置acls仅允许desktop1访问。
在客户端服务器desktop1上使用server0上的分区，将其格式化为500MB的xfs分区，并自动挂载到/mydisk目录下。
一、服务端安装配置
安装软件包
# yum install targetcli
配置防火墙策略
firewall-cmd --permanent --add-port=3260/tcp
firewall-cmd –reload
创建共享设备
[root@server0 ~]# targetcli targetcli shell version 2.1.fb46 Copyright 2011-2013 by Datera, Inc and others. For help on commands, type 'help'. /backstores/block> create san1 /dev/sdb1 --把新分区/dev/sdb1创建为一个块设备，名称为san1 Created block storage object san1 using /dev/sdb1. /backstores/block> /iscsi create iqn.2018-01.com.ultrapower:testServerDisk1 --创建iscsi设备，并指定名称 Created target iqn.2018-01.com.ultrapower:testserverdisk1. Created TPG 1. Global pref auto_add_default_portal=true Created default portal listening on all IPs (0.0.0.0), port 3260. /> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- san1 ......................................................................... [/dev/sdb1 (0 bytes) write-thru deactivated] | | o- alua ................................................................................................... [ALUA Groups: 1] | | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2018-01.com.ultrapower:testserverdisk1 ........................................................................ [TPGs: 1] | o- tpg1 ............................................................................................... [no-gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 0] | o- luns .......................................................................................................... [LUNs: 0] | o- portals .................................................................................................... [Portals: 1] | o- 0.0.0.0:3260 ..................................................................................................... [OK] o- loopback ......................................................................................................... [Targets: 0] />
acls：允许谁访问
lun设备：把iscsi设备和block设备sun1进行关联
portals: 设备iqn监听的端口
#设置acl参数，指明网络上“仅允许desktopX.example.com主机访问”主机可以访问该sicsi设备
/> /iscsi/iqn.2018-01.com.ultrapower:testserverdisk1/tpg1/acls create iqn.2018-01.com.ultrapower:desktop1 Created Node ACL for iqn.2018-01.com.ultrapower:desktop1
#设置lun参数，指明lun管理的iscsi设备（iqn.2018-01.com.ultrapower:testserverdisk1）对应的块设备为san1 。
/> /iscsi/iqn.2018-01.com.ultrapower:testserverdisk1/tpg1/luns create /backstores/block/san1 Created LUN 0. Created LUN 0->0 mapping in node ACL iqn.2018-01.com.ultrapower:desktop1
#设置portal参数，指明共享iscsi设备的IP和端口号，默认为“0.0.0.0 3260”，删除后，重新配置portal参数。
/> /iscsi/iqn.2018-01.com.ultrapower:testserverdisk1/tpg1/portals create 192.168.100.200 3260 Using default IP port 3260 Could not create NetworkPortal in configFS
/> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- san1 ........................................................................... [/dev/sdb1 (0 bytes) write-thru activated] | | o- alua ................................................................................................... [ALUA Groups: 1] | | o- default_tg_pt_gp ....................................................................... [ALUA state: Active/optimized] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2018-01.com.ultrapower:testserverdisk1 ........................................................................ [TPGs: 1] | o- tpg1 ............................................................................................... [no-gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 1] | | o- iqn.2018-01.com.ultrapower:desktop1 .................................................................. [Mapped LUNs: 1] | | o- mapped_lun0 .................................................................................. [lun0 block/san1 (rw)] | o- luns .......................................................................................................... [LUNs: 1] | | o- lun0 ...................................................................... [block/san1 (/dev/sdb1) (default_tg_pt_gp)] | o- portals .................................................................................................... [Portals: 1] | o- 0.0.0.0:3260 ..................................................................................................... [OK] o- loopback ......................................................................................................... [Targets: 0] /> /iscsi/iqn.20.../tpg1/portals> delete 0.0.0.0 3260 --把默认的删除。 Deleted network portal 0.0.0.0:3260 /iscsi/iqn.20.../tpg1/portals> cd / /> iscsi/iqn.2018-01.com.ultrapower:testserverdisk1/tpg1/portals create 192.168.100.200 3260 Using default IP port 3260 Created network portal 192.168.100.200:3260. /> saveconfig --保存退出。 Last 10 configs saved in /etc/target/backup. Configuration saved to /etc/target/saveconfig.json /> exit
服务端配置完成。
[root@server0 ~]# systemctl restart target --重启target服务
二、客户端安装配置
Desktop服务器上安装iscsi-initiator-utils软件包，或者iscsi*
[root@desktop1 home]# yum install -y iscsi-initiator-utils --安装软件包
[root@desktop1 home]# vi /etc/iscsi/initiatorname.iscsi --修改配置文件
InitiatorName=iqn.2018-01.com.ultrapower:desktop1
[root@desktop1 home]# systemctl restart iscsi --重启并设置开机启动
[root@desktop1 home]# systemctl enable iscsi
[root@desktop1 home]# systemctl restart iscsid.service
[root@desktop1 home]# systemctl enable iscsid.service
发现并登入使用server端的iscsi设备（提示:查看man iscsiadm帮助文档中的EXAMPLE示例）:
[root@desktop1 ~]# iscsiadm --mode discoverydb --type sendtargets --portal 192.168.100.200 --discover 192.168.100.200:3260,1 iqn.2018-01.com.ultrapower:testserverdisk1 [root@desktop1 ~]# iscsiadm --mode node --targetname iqn.2018-01.com.ultrapower:testserverdisk1 --portal 192.168.100.200:3260 --login Logging in to [iface: default, target: iqn.2018-01.com.ultrapower:testserverdisk1, portal: 192.168.100.200,3260] (multiple) Login to [iface: default, target: iqn.2018-01.com.ultrapower:testserverdisk1, portal: 192.168.100.200,3260] successful. [root@desktop1 ~]# fdisk -l Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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 label type: dos Disk identifier: 0x000d2b42 Device Boot Start End Blocks Id System /dev/sda1 * 2048 411647 204800 83 Linux /dev/sda2 411648 62914559 31251456 8e Linux LVM Disk /dev/mapper/ruskyVG-root: 29.9 GB, 29850861568 bytes, 58302464 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 /dev/mapper/ruskyVG-swap: 2147 MB, 2147483648 bytes, 4194304 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 /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors --可以看到/dev/sdb磁盘了。 Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 33550336 bytes 将/dev/sdb磁盘分区500MB，并挂载使用。（题目中并未要求挂载） [root@desktop1 ~]# fdisk /dev/sdb Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table Building a new DOS disklabel with disk identifier 0xc17d77c4. Command (m for help): n Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): p Partition number (1-4, default 1): First sector (65528-2097151, default 65528): Using default value 65528 Last sector, +sectors or +size{K,M,G} (65528-2097151, default 2097151): +500M Partition 1 of type Linux and of size 512 MiB is set Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [root@desktop1 ~]# partprobe --刷新分区 Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only. [root@desktop1 ~]# mkfs.xfs /dev/sdb1 --格式化分区 meta-data=/dev/sdb1 isize=512 agcount=4, agsize=32764 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=131056, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=855, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 [root@desktop1 ~]# mkdir /mydisk --创建挂载目录 [root@desktop1 ~]# mount /dev/sdb1 /mydisk/ ---手动挂载测试 [root@desktop1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/ruskyVG-root 28G 3.6G 25G 13% / devtmpfs 715M 0 715M 0% /dev tmpfs 731M 0 731M 0% /dev/shm tmpfs 731M 36M 696M 5% /run tmpfs 731M 0 731M 0% /sys/fs/cgroup /dev/sda1 197M 138M 59M 71% /boot tmpfs 147M 12K 147M 1% /run/user/42 tmpfs 147M 0 147M 0% /run/user/0 192.168.100.200:/home/guests/testldapuser5 28G 3.7G 25G 14% /home/guests/testldapuser5 192.168.100.200:/home/guests/testldapuser2 28G 3.7G 25G 14% /home/guests/testldapuser2 /dev/sr0 3.8G 3.8G 0 100% /mnt/cdrom /dev/sdb1 509M 26M 483M 6% /mydisk ---已经挂载成功了 [root@desktop1 ~]# blkid /dev/sdb1 --查看/dev/sdb1的UUID，挂载网络设备一定要使用UUID. /dev/sdb1: UUID="d69a4140-4622-4dc1-823a-e7cfba80b9fa" TYPE="xfs" [root@desktop1 ~]# vi /etc/fstab --添加开机自动挂载，增加如下一行。一定要添加_netdev，否则开机会卡死。 UUID=d69a4140-4622-4dc1-823a-e7cfba80b9fa /mydisk xfs defaults,_netdev 0 0