CentOS 7.x 下配置iSCSI网络存储

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一、iSCSI简介

iSCSI（internet SCSI）技术由IBM公司研究开发，是一个供硬件设备使用的、可以在IP协议的上层运行的SCSI指令集，这种指令集合可以实现在IP网络上运行SCSI协议，使其能够在诸如高速千兆以太网上进行路由选择。iSCSI技术是一种新储存技术，该技术是将现有SCSI接口与以太网络(Ethernet)技术结合，使服务器可与使用IP网络的储存装置互相交换资料。
iSCSI是一种基于TCP/IP 的协议，用来建立和管理IP存储设备、主机和客户机等之间的相互连接，并创建存储区域网络（SAN）。SAN
使得SCSI 协议应用于高速数据传输网络成为可能，这种传输以数据块级别（block-level）在多个数据存储网络间进行。SCSI
结构基于C/S模式，其通常应用环境是：设备互相靠近，并且这些设备由SCSI 总线连接。
iSCSI 的主要功能是在TCP/IP 网络上的主机系统（启动器 initiator）和存储设备（目标器
完整的iSCSI系统的拓扑结构如下：
备注：上面一段内容出处：http://www.cnblogs.com/mchina/p/centos-iscsi-network-storage.html

二、实验环境

操作系统：CentOS Linux release 7.2.1511 (Core)
iSCSI Target：10.1.1.56 / vdevops.org
iSCSI Initiator：10.1.1.53 / linuxprobe.org
防火墙已关闭/iptables: Firewall is not running.
SELINUX已禁用：SELINUX=disabled

三、配置iSCSI Target

首先安装管理工具
[root@vdevops ~]# yum -y install targetcli
配置iSCSI目标。
例如，在/ iscsi_disks目录下创建磁盘映像并将其设置为SCSI设备

#进入管理控制台[root@vdevops ~]# targetcliWarning: Could not load preferences file /root/.targetcli/prefs.bin.targetcli shell version 2.1.fb41Copyright 2011-2013 by Datera, Inc and others.For help on commands, type 'help'.#在/iscsi_disks/disk01.img上使用2G创建名为“disk01”的磁盘映像/> cd backstores/fileio /backstores/fileio> create disk01 /iscsi_disks/disk01.img 2GCreated fileio disk01 with size 2147483648/backstores/fileio> cd /iscsi #创建目标/iscsi> create iqn.2016-10.vdevops.org:storage.target00Created target iqn.2016-10.vdevops.org:storage.target00.Created TPG 1.Global pref auto_add_default_portal=trueCreated default portal listening on all IPs (0.0.0.0), port 3260./iscsi> cd iqn.2016-10.vdevops.org:storage.target00/tpg1/luns #设置 luns/iscsi/iqn.20...t00/tpg1/luns> create /backstores/fileio/disk01 Created LUN 0./iscsi/iqn.20...t00/tpg1/luns> cd ../acls /iscsi/iqn.20...t00/tpg1/acls> create iqn.2016-10.vdevops.org:vdevops.orgCreated Node ACL for iqn.2016-10.vdevops.org:vdevops.orgCreated mapped LUN 0.#设置ACL（它是允许连接的启动器的IQN）/iscsi/iqn.20...t00/tpg1/acls> cd iqn.2016-10.vdevops.org:vdevops.org/#设置用于验证的UserID/iscsi/iqn.20...g:vdevops.org> set auth userid=usernameParameter userid is now 'username'./iscsi/iqn.20...g:vdevops.org> set auth password=passwordParameter password is now 'password'./iscsi/iqn.20...g:vdevops.org> exitGlobal pref auto_save_on_exit=trueLast 10 configs saved in /etc/target/backup.Configuration saved to /etc/target/saveconfig.json[root@vdevops ~]# ss -napt | grep 3260LISTEN     0      256          *:3260                     *:*                  [root@vdevops ~]# systemctl enable targetCreated symlink from /etc/systemd/system/multi-user.target.wants/target.service to /usr/lib/systemd/system/target.service.[root@vdevops ~]# firewall-cmd --add-service=iscsi-target --permanentsuccess[root@vdevops ~]# firewall-cmd --reloadsuccess

使用iSCSI配置存储服务器
这是使用scsi-target-utils配置iSCSI目标的示例

[1] 安装 scsi-target-utils.# 使用EPEL源安装[root@vdevops ~]# yum --enablerepo=epel -y install scsi-target-utils [2]配置iSCSI目标。  例如，在[/ iscsi_disks]目录下创建磁盘映像并将其设置为共享磁盘。# 创建硬盘镜像[root@vdevops ~]# mkdir /iscsi_disks   #无需重复创建[root@vdevops ~]# dd if=/dev/zero of=/iscsi_disks/disk01.img count=0 bs=1 seek=2G  #同样无需重复创建 [root@vdevops iscsi_disks]# vi /etc/tgt/targets.conf <target iqn.2016-10.vdevops.org:target00>  # provided devicce as a iSCSI target  #  backing-store /iscsi_disks/disk01.img  # iSCSI Initiator's IP address you allow to connect  #  initiator-address 10.1.1.53  # authentication info ( set anyone you like for "username", "password" )  #  incominguser username password</target>[3]如果SElinux为enable状态, 改变SElinux类型.[root@vdevops ~]# chcon -R -t tgtd_var_lib_t /iscsi_disks[root@vdevops ~]# semanage fcontext -a -t tgtd_var_lib_t /iscsi_disks[4]如果防火墙开启，允许iSCSI Target服务[root@vdevops ~]# firewall-cmd --add-service=iscsi-target --permanentsuccess[root@vdevops ~]# firewall-cmd --reloadsuccess

启动 tgtd并验证状态

[root@vdevops ~]# systemctl start tgtd[root@vdevops ~]# systemctl status tgtd● tgtd.service - tgtd iSCSI target daemon   Loaded: loaded (/usr/lib/systemd/system/tgtd.service; disabled; vendor preset: disabled)   Active: active (running) since Mon 2016-10-31 20:46:10 CST; 7s ago  Process: 2860 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v ready (code=exited, status=0/SUCCESS)  Process: 2830 ExecStartPost=/usr/sbin/tgt-admin -e -c $TGTD_CONFIG (code=exited, status=0/SUCCESS)  Process: 2829 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code=exited, status=0/SUCCESS)  Process: 2828 ExecStartPost=/bin/sleep 5 (code=exited, status=0/SUCCESS) Main PID: 2827 (tgtd)   CGroup: /system.slice/tgtd.service           └─2827 /usr/sbin/tgtd -fOct 31 20:46:04 vdevops.org systemd[1]: Starting tgtd iSCSI target daemon...Oct 31 20:46:04 vdevops.org tgtd[2827]: tgtd: iscsi_tcp_init_portal(347) unable to bind server socket, Address already in useOct 31 20:46:04 vdevops.org tgtd[2827]: tgtd: iser_ib_init(3436) Failed to initialize RDMA; load kernel modules?Oct 31 20:46:04 vdevops.org tgtd[2827]: tgtd: work_timer_start(146) use timer_fd based schedulerOct 31 20:46:04 vdevops.org tgtd[2827]: tgtd: bs_init_signalfd(267) could not open backing-store module directory /usr/lib64/tgt/backing-storeOct 31 20:46:04 vdevops.org tgtd[2827]: tgtd: bs_init(386) use signalfd notificationOct 31 20:46:10 vdevops.org tgtd[2827]: tgtd: device_mgmt(246) sz:29 params:path=/iscsi_disks/disk01.imgOct 31 20:46:10 vdevops.org tgtd[2827]: tgtd: bs_thread_open(408) 16Oct 31 20:46:10 vdevops.org systemd[1]: Started tgtd iSCSI target daemon.Hint: Some lines were ellipsized, use -l to show in full.[root@vdevops ~]# systemctl enable tgtdCreated symlink from /etc/systemd/system/multi-user.target.wants/tgtd.service to /usr/lib/systemd/system/tgtd.service.#查看状态[root@vdevops ~]# tgtadm --mode target --op showTarget 1: iqn.2016-10.world.srv:target00    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: 2147 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: /iscsi_disks/disk01.img            Backing store flags:     Account information:        username    ACL information:        10.1.1.53

配置iSCSI启动器

#使用EPEL安装iscsi-initiator-utils[root@linuxprobe ~]# yum -y install iscsi-initiator-utils [root@linuxprobe ~]# vi /etc/iscsi/initiatorname.iscsi# change to the same IQN you set on the iSCSI target serverInitiatorName=iqn.2016-10.vdevops.org:vdevops.org[root@linuxprobe ~]# vi /etc/iscsi/iscsid.conf# line 57: 取消注释node.session.auth.authmethod = CHAP# line 61,62: 取消注释 and specify the username and password you set on the iSCSI target servernode.session.auth.username = usernamenode.session.auth.password = password# 发现target[root@linuxprobe ~]# iscsiadm -m discovery -t sendtargets -p 10.1.1.5610.1.1.56:3260,1 iqn.2016-10.vdevops.org:storage.target00[root@linuxprobe ~]# iscsiadm -m node -o show# BEGIN RECORD 6.2.0.873-33.2node.name = iqn.2016-10.vdevops.org:storage.target00node.tpgt = 1node.startup = automaticnode.leading_login = No......node.conn[0].iscsi.MaxXmitDataSegmentLength = 0node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144node.conn[0].iscsi.HeaderDigest = Nonenode.conn[0].iscsi.IFMarker = Nonode.conn[0].iscsi.OFMarker = No# END RECORD#登录target[root@linuxprobe ~]# iscsiadm -m node --loginLogging in to [iface: default, target: iqn.2016-10.vdevops.org:storage.target00, portal: 10.1.1.56,3260] (multiple)Login to [iface: default, target: iqn.2016-10.vdevops.org:storage.target00, portal: 10.1.1.56,3260] successful.#确认连接状态[root@linuxprobe ~]# iscsiadm -m session -o showtcp: [1] 10.1.1.56:3260,1 iqn.2016-10.vdevops.org:storage.target00 (non-flash)#确认分区状况[root@linuxprobe ~]# cat /proc/partitionsmajor minor  #blocks  name   2        0          4 fd0   8        0   20971520 sda   8        1     512000 sda1   8        2   20458496 sda2  11        0    4228096 sr0 253        0   18317312 dm-0 253        1    2097152 dm-1   8       16    2097152 sdb #从目标服务器提供的添加的新设备为“sdb”

设置iSCSI设备后，在启动器上配置如下所示

#创建标签[root@linuxprobe ~]# parted --script /dev/sdb "mklabel msdos"# 创建分区[root@linuxprobe ~]# parted --script /dev/sdb "mkpart primary 0% 100%"# 格式化分区[root@linuxprobe ~]# mkfs.xfs -i size=1024 -s size=4096 /dev/sdb1meta-data=/dev/sdb1              isize=1024   agcount=4, agsize=130560 blks         =                       sectsz=4096  attr=2, projid32bit=1         =                       crc=0        finobt=0data     =                       bsize=4096   blocks=522240, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=0log      =internal log           bsize=4096   blocks=2560, version=2         =                       sectsz=4096  sunit=1 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0# 挂载分区[root@linuxprobe ~]# mount /dev/sdb1 /mnt/# 查看系统挂载[root@linuxprobe ~]# df -hTFilesystem              Type      Size  Used Avail Use% Mounted on/dev/mapper/centos-root xfs        18G  1.9G   16G  11% /devtmpfs                devtmpfs  483M     0  483M   0% /devtmpfs                   tmpfs     493M     0  493M   0% /dev/shmtmpfs                   tmpfs     493M  6.7M  487M   2% /runtmpfs                   tmpfs     493M     0  493M   0% /sys/fs/cgroup/dev/sda1               xfs       497M  125M  373M  26% /boottmpfs                   tmpfs      99M     0   99M   0% /run/user/0**/dev/sdb1               xfs       2.0G   33M  2.0G   2% /mnt**

到此，我们可以看到ISCSI配置完成，可以正常使用。

ISCSI百度百科：http://baike.baidu.com/link?url=-OA1le_DbAh5ybVq1ZBTbPHJqQb5-jma5vhKR5nCAC7C11UDSwNn_6mPYj0AiABrm8OM2MoExN__9GvzvhVg8K

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