一、iSCSI服务
二、iSCSI服务设置
1.安装并开启服务
[root@server ~]# yum install targetcli -y
[root@server ~]# systemctl start target
[root@server ~]# systemctl status target
2.新建分区 ##同步分区表
[root@server ~]# fdisk /dev/vdb
Device Boot Start End Blocks Id System
/dev/vdb1 2048 2099199 1048576 8e Linux LVM
/dev/vdb2 2099200 6293503 2097152 83 Linux
3.配置iSCSI
[root@localhost ~]# targetcli
/> ls ##蓝色是目录，紫色是文件
/> /backstores/block create westos:storagel /dev/vdb2 ##命名并关联设备
Created block storage object westos:storagel using /dev/vdb2.
/> /iscsi create iqn.2018-05.com.westos:storagel ##设定IQN
Created target iqn.2018-05.com.westos:storagel.
Created TPG 1.
/> /iscsi/iqn.2018-05.com.westos:storagel/tpg1/acls create iqn.2018-05.com.westos:westoskey ##设置密码
Created Node ACL for iqn.2018-05.com.westos:westoskey
/> /iscsi/iqn.2018-05.com.westos:storagel/tpg1/luns create /backstores/block/westos:storagel ##关联westos:storagel
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2018-05.com.westos:westoskey
/> /iscsi/iqn.2018-05.com.westos:storagel/tpg1/portals create 172.25.254.108
Using default IP port 3260 ##打开接口
Created network portal 172.25.254.108:3260.
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
帮助服务
/> /iscsi/iqn.2018-06.com.example:storage1/tpg1/portals/
/iscsi/iqn.20.../tpg1/portals> help
客户端配置
1.安装iscsi-initiator-utils
[root@client ~]# yum install iscsi-initiator-utils -y
2.开启iscsid服务
[root@client ~]# systemctl stop firewalld.service
[root@client ~]# systemctl start iscsid
3.查看108主机的共享硬盘
[root@client ~]# iscsiadm -m discovery -t st -p 172.25.254.181
172.25.254.181:3260,1 iqn.2018-05.com.westos:storagel
4.链接108主机的硬盘 ##链接失败，没有key
[root@client ~]# iscsiadm -m node -T iqn.2018-05.com.westos:storagel -p 172.25.254.181 -l
Logging in to [iface: default, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260] (multiple)
iscsiadm: Could not login to [iface: default, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260].
iscsiadm: initiator reported error (24 - iSCSI login failed due to authorization failure)
iscsiadm: Could not log into all portals
5.修改key（服务端的加密key）
[root@client ~]# vim /etc/iscsi/initiatorname.iscsi
iqn.2018-05.com.westos:westoskey
重启服务再次获得硬盘
[root@client ~]# systemctl restart iscsid.service
[root@client ~]# iscsiadm -m node -T iqn.2018-05.com.westos:storagel -p 172.25.254.181 -l
Logging in to [iface: default, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260] (multiple)
Login to [iface: default, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260] successful.
客户端可看到添加1个硬盘
[root@client ~]# fdisk -l
Disk /dev/sda: 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 / 4194304 bytes
对/dev/sda硬盘分区、格式化、挂载
[root@localhost ~]# fdisk /dev/sda
[root@localhost ~]# mkfs.xfs /dev/sda
[root@localhost ~]# mount /dev/sda /mnt
[root@localhost ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3193680 7280220 31% /
devtmpfs 469344 0 469344 0% /dev
tmpfs 484932 80 484852 1% /dev/shm
tmpfs 484932 12832 472100 3% /run
tmpfs 484932 0 484932 0% /sys/fs/cgroup
/dev/mapper/vg0-vo 483670 2368 451811 1% /home
/dev/sda1 1041068 33056 1008012 4% /mnt
三、iSCSI管理
1.客户端永久挂载 /etc/fstab ##注意：先开启服务，再加载网络
/dev/sda1 /mnt xfs defaults,_netdev 0 0
重启后会出错，需要强制关闭，再开启服务端
[root@client ~]# virsh destroy desktop
Domain desktop destroyed
开机后查看
[root@client ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3194712 7279188 31% /
devtmpfs 469344 0 469344 0% /dev
tmpfs 484932 124 484808 1% /dev/shm
tmpfs 484932 12840 472092 3% /run
tmpfs 484932 0 484932 0% /sys/fs/cgroup
/dev/mapper/vg0-vo 483670 2339 451840 1% /home
/dev/sr0 3654720 3654720 0 100% /run/media/root/RHEL-7.0 Server.x86_64
/dev/sda 2086912 33056 2053856 2% /mnt
还原设置
1.取消永久挂载 /etc/fstab
2.安装目录树服务 tree
3.卸载硬盘 ##此时fdisk -l 已无/dev/sda硬盘
[root@client ~]# iscsiadm -m node -T iqn.2018-05.com.westos:storage1 -u
Logging out of session [sid: 1, target: iqn.2018-05.com.westos:storage1, portal: 172.25.254.181,3260]
Logout of [sid: 1, target: iqn.2018-05.com.westos:storage1, portal: 172.25.254.181,3260] successful.
注意：重启iscsi服务，依然会自动挂载
[root@client ~]# systemctl restart iscsi
[root@client ~]# fdisk -l
Disk /dev/sda: 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 / 4194304 bytes
[root@client ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vda1 10473900 3194712 7279188 31% /
devtmpfs 469344 0 469344 0% /dev
tmpfs 484932 124 484808 1% /dev/shm
tmpfs 484932 12840 472092 3% /run
tmpfs 484932 0 484932 0% /sys/fs/cgroup
/dev/mapper/vg0-vo 483670 2339 451840 1% /home
/dev/sr0 3654720 3654720 0 100% /run/media/root/RHEL-7.0 Server.x86_64
/dev/sda 2086912 33056 2053856 2% /mnt
4.查看iscsi的树目录结构
yum install tree -y
[root@client ~]# tree /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│ └── iqn.2018-05.com.westos:storagel
│ └── 172.25.254.181,3260,1
│ └── default
├── send_targets
│ └── 172.25.254.181,3260
│ ├── iqn.2018-05.com.westos:storagel,172.25.254.181,3260,1,default -> /var/lib/iscsi/nodes/iqn.2018-05.com.westos:storagel/172.25.254.181,3260,1
│ └── st_config
├── slp
└── static
10 directories, 2 files
5.删除iscsi树目录下的iqn.2018-05.com.westos:storagel
iscsiadm -m node -T iqn设备名 【-u（卸载）】【-o delete】
[root@client ~]# iscsiadm -m node -T iqn.2018-05.com.westos:storagel -u
Logging out of session [sid: 4, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260]
Logout of [sid: 4, target: iqn.2018-05.com.westos:storagel, portal: 172.25.254.181,3260] successful.
[root@client ~]# iscsiadm -m node -T iqn.2018-05.com.westos:storagel -o delete
[root@client ~]# tree /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
├── send_targets
│ └── 172.25.254.181,3260
│ └── st_config
├── slp
└── static
7 directories, 1 file
6.再次重启iscsi，/dev/sda硬盘已移除
[root@client ~]# systemctl restart iscsi
[root@client ~]# fdisk -l | grep /dev/sda
7.服务端删除共享硬盘 服务器
[root@server ~]# targetcli
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/iscsi> help ##查看相关命令帮助
AVAILABLE COMMANDS
==================
The following commands are available in the
current path:
- bookmarks action [bookmark]
- cd [path]
- clearconfig [confirm]
- exit
- get [group] [parameter...]
- help [topic]
- ls [path] [depth]
- pwd
- refresh
- restoreconfig [savefile] [clear_existing]
- saveconfig [savefile]
- sessions [action] [sid]
- set [group] [parameter=value...]
- status
- version
/> clearconfig confirm=true
All configuration cleared
/> 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]