ISCSI,小型计算机系统接口,又称为IP-SAN,是一种基于因特网及SCSI-3协议下的存储技术,它可以共享镜像文件(*.img)、分区(partition)、物理硬盘和逻辑卷等。现在使用ISCSI技术实现局域网内共享物理磁盘和磁盘分区。
对额外挂载两个磁盘的机器,中的一个磁盘做分区操作
磁盘分区
[root@server ~]# fdisk /dev/sdc 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 0xf9c6e7e6. Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition g create a new empty GPT partition table G create an IRIX (SGI) partition table l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) 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 (2048-20971519, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): Using default value 20971519 Partition 1 of type Linux and of size 10 GiB is set Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [root@server ~]#
安装scsi-target-utils和scsi-target-utils
[root@server ~]# yum -y install epel-release [root@server ~]# yum -y install scsi-target-utils [root@server ~]# chkconfig tgtd on Note: Forwarding request to 'systemctl enable tgtd.service'. Created symlink from /etc/systemd/system/multi-user.target.wants/tgtd.service to /usr/lib/systemd/system/tgtd.service. [root@server ~]# service tgtd start Redirecting to /bin/systemctl start tgtd.service [root@server ~]# ss -tunlp | grep tgt tcp LISTEN 0 128 *:3260 *:* users:(("tgtd",pid=12504,fd=6)) tcp LISTEN 0 128 :::3260 :::* users:(("tgtd",pid=12504,fd=7)) [root@server ~]#
编辑/etc/tgt/targets.conf
追加以下内容
<target iqn.2022.04.com.rac:iscsi.disk> backing-store /dev/sdb backing-store /dev/sdc1 incominguser iscsiuser iscsiuser initiator-address 192.168.100.0/24 </target>
backiing-store:共享的存储路径
incominguser:该target的账密
initiator-address:可以登录该target的IP或者IP段
target命名规则:iqn.年份-月份.域名反写.设备识别
关闭防火墙
[root@server ~]# systemctl disable firewalld.service
编辑/etc/selinux/config,把enforce更改成disabled
[root@server ~]# vim /etc/selinux/config
# This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - No SELinux policy is loaded. SELINUX=disabled # SELINUXTYPE= can take one of three values: # targeted - Targeted processes are protected, # minimum - Modification of targeted policy. Only selected processes are protected. # mls - Multi Level Security protection. SELINUXTYPE=targeted
安装iscsi-initiator-utils
[root@node1 ~]# yum -y install iscsi-initiator-utils
设置开机自启动
[root@node1 ~]# chkconfig iscsi on [root@node1 ~]# chkconfig iscsid on
配置initiator文件
vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2022.04.com.rac:iscsi.disk
配置iscsid.conf文件:
[root@node1 ~]# vim /etc/iscsi/iscsid.conf
把以下配置项的注释取消掉,并填入用户名和密码
# To enable CHAP authentication set node.session.auth.authmethod # to CHAP. The default is None. node.session.auth.authmethod = CHAP # To configure which CHAP algorithms to enable set # node.session.auth.chap_algs to a comma seperated list. # The algorithms should be listen with most prefered first. # Valid values are MD5, SHA1, SHA256 # The default is MD5. #node.session.auth.chap_algs = SHA256,SHA1,MD5 # To set a CHAP username and password for initiator # authentication by the target(s), uncomment the following lines: node.session.auth.username = iscsiuser node.session.auth.password = iscsiuser
启动客户端服务
[root@node1 ~]# service iscsi start [root@node1 ~]# service iscsid start
设置开机自连接
开机启动iscsi服务
[root@node1 ~]# chkconfig iscsid on
查找target,如果查找失败,重启服务器端
[root@node1 ~]# iscsiadm -m discovery -t st -p 192.168.100.188 192.168.100.188:3260,1 iqn.2022.04.com.rac:iscsi.disk
手动登录到共享的ISCSI存储
[root@node1 ~]# iscsiadm -m node -T iqn.2022.04.com.rac:iscsi.disk -p 192.168.100.188 -l Logging in to [iface: default, target: iqn.2022.04.com.rac:iscsi.disk, portal: 192.168.100.188,3260] (multiple) Login to [iface: default, target: iqn.2022.04.com.rac:iscsi.disk, portal: 192.168.100.188,3260] successful. [root@node1 ~]#
设置开机自启动连接target
[root@node1 ~]# iscsiadm -m node -T iqn.2022.04.com.rac:iscsi.disk -p 192.168.100.188 --op update -n node.startup -v automatic=