目录
- iSCSI
- 定义
- 组件术语
- 启动器
- 目标
- ACL
- 发现
- IQN
- 登录
- LUN
- 节点
- 门户
- TPG
- 搭建一个iSCSI服务
- 提供一个iSCSI目标
- 配置iSCSI客户端
iSCSI
定义
SCSI 是 Small Computer System Interface。
iSCSI就是Internet小型计算机系统接口，基于TCP/IP协议。通过网络仿真SCSI高性能本地存储总栈，从而为远程块存储设备提供数据传输和管理。
组件术语
启动器
一个iSCSI客户端，通常是软件提供，必须为启动器授予一个唯一名称(IQN)
目标
一个iSCSI存储资源，针对来自iSCSI服务器的连接而配置。必须为目标授予一个唯一名称(IQN)。一个服务器可以同时提供多个目标。
ACL
访问权限控制条目，一个使用节点IQN来验证启动器的范根权限的访问限制。
发现
查询目标服务器以流出配置的目标
IQN
iSCSI限定名称，一个全球唯一名称，用于以强制命名格式来识别启动器和目标。
iqn.YYYY-MM.com.reversed.domain[:optional_string]
`iqn` 表示此名称将使用域作为其标识符
`YYYY-MM`拥有域名的第一个月
`com.reversed.domain`组织的逆向域名登录
项目表进行身份验证以开始说那个客户端块设备
LUN
逻辑单元号。带有编号的块设备连接到目标并且通过目标来使用。可以有一个或多个LUN连接到单个目标，但是通常一个目标仅提供一个LUN
节点
任何iSCSI启动器或目标由其IQN来标识
门户
目标或启动器上用于建立连接的IP地址和端口
TPG
目标门户组，某个特定的iSCSI目标将要侦听的接口IP地址和TCP端口的集合
搭建一个iSCSI服务
提供一个iSCSI目标
安装targetcli
[root@rhel1 ~]# yum install -y targetcli创建新的分区
在原有的基础上创建了/dev/sdb7的分区类型是Linux LVM (8e)
[root@rhel1 ~]# 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.
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 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: 0xed07c356
Device Boot Start End Blocks Id System
/dev/sdb1 2048 20973567 10485760 5 Extended
/dev/sdb5 4096 413695 204800 83 Linux
/dev/sdb6 415744 825343 204800 83 Linux
Command (m for help): n
Partition type:
p primary (0 primary, 1 extended, 3 free)
l logical (numbered from 5)
Select (default p): l
Adding logical partition 7
First sector (827392-20973567, default 827392):
Using default value 827392
Last sector, +sectors or +size{K,M,G} (827392-20973567, default 20973567): +500M
Partition 7 of type Linux and of size 500 MiB is set
Command (m for help): t
Partition number (1,5-7, default 7):
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 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: 0xed07c356
Device Boot Start End Blocks Id System
/dev/sdb1 2048 20973567 10485760 5 Extended
/dev/sdb5 4096 413695 204800 83 Linux
/dev/sdb6 415744 825343 204800 83 Linux
/dev/sdb7 827392 1851391 512000 8e Linux LVM
Command (m for help): w
[root@rhel1 ~]# partprobe创建逻辑卷
[root@rhel1 ~]# pvcreate /dev/sdb7
Physical volume "/dev/sdb7" successfully created
[root@rhel1 ~]# vgcreate iSCSI /dev/sdb7
Volume group "iSCSI" successfully created
[root@rhel1 ~]#
[root@rhel1 ~]# lvcreate -n iSCSI1 -L 100M iSCSI
Logical volume "iSCSI1" created运行targetcli
进入后是交互模式
[root@rhel1 ~]# targetcli
/> 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]
/> 添加块BLOCK
/> backstores/block create server_disk1 /dev/iSCSI/iSCSI1
Created block storage object server_disk1 using /dev/iSCSI/iSCSI1.常见一个目标并配置IQN
/> iscsi/ create iqn.2019-11.com.node:control1
Created target iqn.2019-11.com.node:control1.
Created TPG 1.
为目标添加一个启动器并配置IQN
/> iscsi/iqn.2019-11.com.node:control1/tpg1/acls create iqn.2019-11.com.node:control2
Created Node ACL for iqn.2019-11.com.node:control2
# 一会客户端会通过iqn.2019-11.com.node:control2这个IQN连接过来为目标分配一个LUN逻辑单元
/> iscsi/iqn.2019-11.com.node:control1/tpg1/luns create /backstores/block/server_disk1
Created LUN 0.
Created LUN 0->0 mapping in node ACL iqn.2019-11.com.node:control2
# 也就是说连接到这个目标就可以使用这个块设备了。可以配置多个配置门户
/> iscsi/iqn.2019-11.com.node:control1/tpg1/portals create 192.168.143.10Using default IP port 3260
Created network portal 192.168.143.10:3260.
# 配置当前服务器IP 端口号默认3260可以更换保存配置并退出
/> saveconfig
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json
防火墙放行，启动服务
[root@rhel1 ~]# firewall-cmd --add-port=3260/tcp --permanent
success
[root@rhel1 ~]# firewall-cmd --add-port=3260/tcp
success
[root@rhel1 ~]# systemctl start target
[root@rhel1 ~]# systemctl enable target
ln -s '/usr/lib/systemd/system/target.service' '/etc/systemd/system/multi-user.target.wants/target.service'查看状态
[root@rhel1 ~]# netstat -tunpl | grep 3260
tcp 0 0 192.168.143.10:3260 0.0.0.0:* LISTEN - 配置iSCSI客户端
使用RHEL2充当客户端
配置
# 安装
[root@rhel2 ~]# yum install iscsi*
# 启动
[root@rhel2 ~]# systemctl restart iscsi
[root@rhel2 ~]# systemctl enable iscsi
# 配置
### 此处添加的是服务器那边配置的ACL的IQN
[root@rhel2 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2019-11.com.node:control2使用
# 查看服务端的target
[root@rhel2 ~]# iscsiadm -m discovery -t st -p 192.168.143.10
192.168.143.10:3260,1 iqn.2019-11.com.node:control1
# 操作前查看一下当前disk只有/dev/sda
[root@rhel2 ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x000c979f
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 4810751 2097152 82 Linux swap / Solaris
/dev/sda3 4810752 41943039 18566144 83 Linux
# 登录到这个target上
[root@rhel2 ~]# iscsiadm -m node -T iqn.2019-11.com.node:control1 -l
Logging in to [iface: default, target: iqn.2019-11.com.node:control1, portal: 192.168.143.10,3260] (multiple)
Login to [iface: default, target: iqn.2019-11.com.node:control1, portal: 192.168.143.10,3260] successful.
# 再次查看disk 多了/dev/sdb
[root@rhel2 ~]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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: 0x000c979f
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 4810751 2097152 82 Linux swap / Solaris
/dev/sda3 4810752 41943039 18566144 83 Linux
Disk /dev/sdb: 104 MB, 104857600 bytes, 204800 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
分区、配置挂载
- 分区
[root@rhel2 ~]# 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 0x0eb5d0ea.
Command (m for help): p
Disk /dev/sdb: 104 MB, 104857600 bytes, 204800 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
Disk label type: dos
Disk identifier: 0x0eb5d0ea
Device Boot Start End Blocks Id System
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (8192-204799, default 8192):
Using default value 8192
Last sector, +sectors or +size{K,M,G} (8192-204799, default 204799): 50^H
Value out of range.
Last sector, +sectors or +size{K,M,G} (8192-204799, default 204799): +50M
Partition 1 of type Linux and of size 52 MiB is set
Command (m for help): p
Disk /dev/sdb: 104 MB, 104857600 bytes, 204800 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
Disk label type: dos
Disk identifier: 0x0eb5d0ea
Device Boot Start End Blocks Id System
/dev/sdb1 8192 114687 53248 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@rhel2 ~]# partprobe
[root@rhel2 ~]# - 格式化
[root@rhel2 ~]# mkfs.ext4 /dev/sdb1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=4096 blocks
13328 inodes, 53248 blocks
2662 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33685504
7 block groups
8192 blocks per group, 8192 fragments per group
1904 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done- 配置自动挂载
# 查看uuid
[root@rhel2 ~]# blkid /dev/sdb1
/dev/sdb1: UUID="eff8388b-2e93-4501-bf74-60bd870b5192" TYPE="ext4"
# 编辑/etc/fstab文件
####################一定要加上`,_netdev`##########################
[root@rhel2 ~]# tail -1 /etc/fstab
UUID=eff8388b-2e93-4501-bf74-60bd870b5192 /allow ext4 defaults,_netdev 0 0
[root@rhel2 ~]# mkdir /allow
[root@rhel2 ~]# mount -a
[root@rhel2 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 xfs 18G 1.4G 17G 8% /
devtmpfs devtmpfs 909M 0 909M 0% /dev
tmpfs tmpfs 914M 0 914M 0% /dev/shm
tmpfs tmpfs 914M 8.6M 905M 1% /run
tmpfs tmpfs 914M 0 914M 0% /sys/fs/cgroup
/dev/sda1 xfs 297M 85M 213M 29% /boot
/dev/sr0 iso9660 3.5G 3.5G 0 100% /mnt
/dev/sdb1 ext4 47M 1.1M 42M 3% /allow
# 可以重启试一下 是否自动挂载
### 注意重启话先退出iscsi的登录
[root@rhel2 ~]# iscsiadm -m node -T iqn.2019-11.com.node:control1 -u
Logging out of session [sid: 1, target: iqn.2019-11.com.node:control1, portal: 192.168.143.10,3260]
Logout of [sid: 1, target: iqn.2019-11.com.node:control1, portal: 192.168.143.10,3260] successful.