红帽学习记录[RHCE] ISCSI远程块储存

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

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.

posted @ 2019-11-30 11:31 WangKane 阅读(451) 评论(0) 编辑收藏举报

会员力量，点亮园子希望

刷新页面返回顶部

王老脸

陪你阅读，每天进步一点点。

红帽学习记录[RHCE] ISCSI远程块储存

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

安装`targetcli`

创建新的分区

创建逻辑卷

运行`targetcli`

添加`块BLOCK`

常见一个目标并配置`IQN`

为目标添加一个启动器并配置`IQN`

为目标分配一个`LUN`逻辑单元

配置门户

保存配置并退出

防火墙放行，启动服务

查看状态

配置iSCSI客户端

配置

使用

分区、配置挂载

公告

王老脸

陪你阅读，每天进步一点点。

红帽学习记录[RHCE] ISCSI远程块储存

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

安装targetcli

创建新的分区

创建逻辑卷

运行targetcli

添加块BLOCK

常见一个目标并配置IQN

为目标添加一个启动器并配置IQN

为目标分配一个LUN逻辑单元

配置门户

保存配置并退出

防火墙放行，启动服务

查看状态

配置iSCSI客户端

配置

使用

分区、配置挂载

公告

安装`targetcli`

运行`targetcli`

添加`块BLOCK`

常见一个目标并配置`IQN`

为目标添加一个启动器并配置`IQN`

为目标分配一个`LUN`逻辑单元