准备工作：
主机系统地址软件target主机CentOS 6.4 i386192.168.0.22iscsi-target-utilsinitiator主机CentOS 6.4 i386192.168.0.23iscsi-initiator-utilsinitiator主机CentOS 6.4 i386192.168.0.24iscsi-initiator-utils
一. 配置target主机
在target主机有两块硬盘，/dev/sda和/dev/sdb，其中sdb作为iSCSI的共享磁盘
1. 安装iSCSI的服务端
[root@target ~]# yum install scsi-target-utils
2. 将tgtd服务设置为开机启动，并将它启动
[root@target ~]# chkconfig tgtd on[root@target ~]# service tgtd startStarting SCSI target daemon: [ OK ]
3. 关于tgtadm命令的简单介绍
[root@target ~]# tgtadm -hUsage: tgtadm [OPTION]Linux SCSI Target Framework Administration Utility, version 1.0.24 --lld driver --mode target --op new --tid id --targetname name add a new target with id and name . id must not be zero. --lld driver --mode target --op delete [--force] --tid id delete the specific target with id . With force option, the specific target is deleted even if there is an activity. --lld driver --mode target --op show show all the targets. --lld driver --mode target --op show --tid id show the specific target's parameters. --lld driver --mode target --op update --tid id --name param --value value change the target parameters of the specific target with id . --lld driver --mode target --op bind --tid id --initiator-address address --lld driver --mode target --op bind --tid id --initiator-name name enable the target to accept the specific initiators. --lld driver --mode target --op unbind --tid id --initiator-address address --lld driver --mode target --op unbind --tid id --initiator-name name disable the specific permitted initiators. --lld driver --mode logicalunit --op new --tid id --lun lun \ --backing-store path --bstype type --bsoflags options add a new logical unit with lun to the specific target with id . The logical unit is offered to the initiators. path must be block device files (including LVM and RAID devices) or regular files. bstype option is optional. bsoflags supported options are sync and direct (sync:direct for both). --lld driver --mode logicalunit --op delete --tid id --lun lun delete the specific logical unit with lun that the target with id has. --lld driver --mode account --op new --user name --password pass add a new account with name and pass . --lld driver --mode account --op delete --user name delete the specific account having name . --lld driver --mode account --op bind --tid id --user name [--outgoing] add the specific account having name to the specific target with id . user could be IncomingUser or OutgoingUser . If you use --outgoing option, the account will be added as an outgoing account. --lld driver --mode account --op unbind --tid id --user name delete the specific account having name from specific target. --control-port port use control port port --help display this help and exitReport bugs to stgt@vger.kernel.org .
首先，创建一个target
[root@target ~]# tgtadm -L iscsi -m target -o new -t 1 -T iqn.2014-03.com.flyence:target1
查看该target的相关情况
[root@target ~]# tgtadm -L iscsi -m target -o show
创建一个LU，并将/dev/sdb作为共享磁盘
[root@target ~]# tgtadm -L iscsi -m logicalunit -o new -t 1 -l 1 -b /dev/sdb
允许192.168.0.0/16网段的主机访问
[root@target ~]# tgtadm -L iscsi -m target -o bind -t 1 -I 192.168.0.0/24
创建认证账号，并绑定到target上
[root@target ~]# tgtadm -L iscsi -m account -o new --user flyence --password flyence[root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user flyence
该账号作为客户机访问服务端的认证账号
创建认证账号，并以outgoing的形式绑定到target上
[root@target ~]# tgtadm -L iscsi -m account -o new --user evan --password evan[root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user evan --outgoing
当客户机向服务端写入前，客户机会用此账号验证服务器的身份。
二. 配置客户端
1. 安装iscsi-initiator-utils
[root@initiator ~]# yum install iscsi-initiator-utils
2. 设置initiator的名字
[root@initiator iscsi]# echo "InitiatorName=`iscsi-iname -p iqn.2014-03.com.flyence`" /etc/iscsi/initiatorname.iscsi[root@initiator iscsi]# cat initiatorname.iscsiInitiatorName=iqn.2014-03.com.flyence:9e9d0941d1f
3. 在/etc/iscsi/iscsi.conf中配置验证账号信息，启用以下5行，并修改
node.session.auth.authmethod = CHAPnode.session.auth.username = flyencenode.session.auth.password = flyencenode.session.auth.username_in = evannode.session.auth.password_in = evan
4. 发现服务器的target
[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260Starting iscsid: [ OK ]192.168.0.22:3260,1 iqn.2014-03.com.flyence:target1
5. 登录上述被发现的target
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -lLogging in to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] (multiple)Login to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.
6. 查看当前的磁盘情况
[root@initiator iscsi]# fdisk -l /dev/sd[a-z]Disk /dev/sda: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000925b4 Device Boot Start End Blocks Id System/dev/sda1 * 1 26 204800 83 LinuxPartition 1 does not end on cylinder boundary./dev/sda2 26 7675 61440000 8e Linux LVM/dev/sda3 7675 14049 51200000 8e Linux LVM/dev/sda4 14049 15666 12983296 5 Extended/dev/sda5 14049 15666 12982272 8e Linux LVMDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000
多出一块硬盘/dev/sdb，并且sdb还没分区，
7. 将sdb分两个区，并将sdb1格式化为ext4
[root@initiator iscsi]# fdisk /dev/sdb[root@initiator iscsi]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42 Device Boot Start End Blocks Id System/dev/sdb1 1 1306 10490413+ 83 Linux/dev/sdb2 1307 2612 10490445 83 Linux[root@initiator iscsi]# mkfs.ext4 /dev/sdb1
8. 此时，查看target主机的sdb硬盘情况
[root@target ~]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42 Device Boot Start End Blocks Id System/dev/sdb1 1 1306 10490413+ 83 Linux/dev/sdb2 1307 2612 10490445 83 Linux
已被分好区
当要开机启动服务时
[root@initiator iscsi]# chkconfig iscsid on
三. 服务端target配置文件的设定
在服务端如果只是在命令行中定义target和LU，在重启时会消失，要使其永久有效，就得写入配置文件/etc/tgt/targets.conf
target iqn.2014-03.com.flyence:target2 backing-store /dev/sdb initiator-address 192.168.0.0/16 incominguser flyence flyence outgoinguser evan evan /target
重启服务器主机，再看看target的配置
[root@target ~]# tgtadm -L iscsi -m target -o showTarget 1: iqn.2014-03.com.flyence:target2 System information: Driver: iscsi State: ready I_T nexus information: I_T nexus: 1 Initiator: iqn.2014-03.com.flyence:9e9d0941d1f Connection: 0 IP Address: 192.168.0.23 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 Backing store type: null Backing store path: None Backing store flags: LUN: 1 Type: disk SCSI ID: IET 00010001 SCSI SN: beaf11 Size: 128849 MB, Block size: 512 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: rdwr Backing store path: /dev/sdb Backing store flags: Account information: flyence evan (outgoing) ACL information: 192.168.0.0/16
此时，由于已修改了target的名字，则客户机无法直接登录，只能删除原有信息，重新发现和登录
在客户机上，先登出原有的target
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -uLogging out of session [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260]Logout of [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.
删除该target及相关文件
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -o delete[root@initiator iscsi]# rm -rf /var/lib/iscsi/send_targets/192.168.0.22,3260/
重启服务
[root@initiator iscsi]# service iscsid restartStopping iscsid:Starting iscsid: [ OK ]
重新发现和登录
[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260192.168.0.22:3260,1 iqn.2014-03.com.flyence:target2[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target2 -p 192.168.0.22:3260 -lLogging in to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] (multiple)Login to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] successful.
查看磁盘
[root@initiator iscsi]# fdisk -l /dev/sdbDisk /dev/sdb: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xc9458e42 Device Boot Start End Blocks Id System/dev/sdb1 1 1306 10490413+ 83 Linux/dev/sdb2 1307 2612 10490445 83 Linux
背着背包的路上，看过许多人，
