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    在 CentOS8 搭建 iSCSI 服务器

    Teacher Du发表于 2024-11-01 03:51:26
    love 0

    在前文中，我们讲解了 iSCSI 相关概念。本文将展示如何在 CentOS8 上配置 iSCSI 存储服务器，如遇任何问题，欢迎在评论区与杜老师交流，让我们开始吧！

    服务安装

    使用 dnf 命令安装 targetcli：

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    [root@localhost ~]# dnf -y install targetcli
    上次元数据过期检查：1:49:08 前，执行于 2021年01月24日 星期日 01时34分43秒。
    依赖关系解决。
    ================================================================================
     软件包                   架构        版本                 仓库            大小
    ================================================================================
    安装:
     targetcli                noarch      2.1.53-1.el8         appstream       80 k
    安装依赖关系:
     python3-configshell      noarch      1:1.1.28-1.el8       baseos          72 k
     python3-kmod             x86_64      0.9-20.el8           baseos          90 k
     python3-pyparsing        noarch      2.1.10-7.el8         baseos         142 k
     python3-rtslib           noarch      2.1.73-2.el8         baseos         102 k
     python3-urwid            x86_64      1.3.1-4.el8          baseos         783 k
     target-restore           noarch      2.1.73-2.el8         baseos          24 k

    事务概要
    ================================================================================
    安装  7 软件包

    总下载：1.3 M
    安装大小：4.7 M
    下载软件包：
    (1/7): targetcli-2.1.53-1.el8.noarch.rpm         68 kB/s |  80 kB     00:01    
    (2/7): python3-pyparsing-2.1.10-7.el8.noarch.rp 538 kB/s | 142 kB     00:00    
    (3/7): python3-configshell-1.1.28-1.el8.noarch.  50 kB/s |  72 kB     00:01    
    (4/7): python3-kmod-0.9-20.el8.x86_64.rpm        62 kB/s |  90 kB     00:01    
    (5/7): python3-rtslib-2.1.73-2.el8.noarch.rpm   1.1 MB/s | 102 kB     00:00    
    (6/7): target-restore-2.1.73-2.el8.noarch.rpm   319 kB/s |  24 kB     00:00    
    (7/7): python3-urwid-1.3.1-4.el8.x86_64.rpm     3.7 MB/s | 783 kB     00:00    
    --------------------------------------------------------------------------------
    总计                                            449 kB/s | 1.3 MB     00:02     
    运行事务检查
    事务检查成功。
    运行事务测试
    事务测试成功。
    运行事务
      准备中  :                                                                 1/1 
      安装    : python3-urwid-1.3.1-4.el8.x86_64                                1/7 
      安装    : python3-pyparsing-2.1.10-7.el8.noarch                           2/7 
      安装    : python3-configshell-1:1.1.28-1.el8.noarch                       3/7 
      安装    : python3-kmod-0.9-20.el8.x86_64                                  4/7 
      安装    : python3-rtslib-2.1.73-2.el8.noarch                              5/7 
      安装    : target-restore-2.1.73-2.el8.noarch                              6/7 
      运行脚本: target-restore-2.1.73-2.el8.noarch                              6/7 
      安装    : targetcli-2.1.53-1.el8.noarch                                   7/7 
      运行脚本: targetcli-2.1.53-1.el8.noarch                                   7/7 
      验证    : targetcli-2.1.53-1.el8.noarch                                   1/7 
      验证    : python3-configshell-1:1.1.28-1.el8.noarch                       2/7 
      验证    : python3-kmod-0.9-20.el8.x86_64                                  3/7 
      验证    : python3-pyparsing-2.1.10-7.el8.noarch                           4/7 
      验证    : python3-rtslib-2.1.73-2.el8.noarch                              5/7 
      验证    : python3-urwid-1.3.1-4.el8.x86_64                                6/7 
      验证    : target-restore-2.1.73-2.el8.noarch                              7/7 
    Installed products updated.

    已安装:
      python3-configshell-1:1.1.28-1.el8.noarch  python3-kmod-0.9-20.el8.x86_64     
      python3-pyparsing-2.1.10-7.el8.noarch      python3-rtslib-2.1.73-2.el8.noarch 
      python3-urwid-1.3.1-4.el8.x86_64           target-restore-2.1.73-2.el8.noarch 
      targetcli-2.1.53-1.el8.noarch             

    完毕！

    输入 targetcli 命令后会提示配置文件不存在，使用 exit 会自动生成配置文件：

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    [root@localhost ~]# targetcli
    Warning: Could not load preferences file /root/.targetcli/prefs.bin.
    targetcli shell version 2.1.53
    Copyright 2011-2013 by Datera, Inc and others.
    For help on commands, type 'help'.

    /> exit
    Global pref auto_save_on_exit=true
    Configuration saved to /etc/target/saveconfig.json

    服务启动

    启动服务：

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    [root@localhost ~]# systemctl start target

    设置开机启动：

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    [root@localhost ~]# systemctl enable target
    Created symlink /etc/systemd/system/multi-user.target.wants/target.service → /usr/lib/systemd/system/target.service.

    创建存储

    这里我们以/dusays/目录为例，使用命令 /backstores/fileio create dusays /dusays/dusays.img 1G 创建名为 dusays 的 1G 大小存储文件，创建后通过 ls 查看执行结果：

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    [root@localhost ~]# mkdir /dusays
    [root@localhost ~]# targetcli
    targetcli shell version 2.1.53
    Copyright 2011-2013 by Datera, Inc and others.
    For help on commands, type 'help'.

    /> backstores/fileio/ create www /dusays/www.img 1G
    Created fileio www with size 1073741824
    /> ls
    o- / ..................................................................... [...]
      o- backstores .......................................................... [...]
      | o- block .............................................. [Storage Objects: 0]
      | o- fileio ............................................. [Storage Objects: 1]
      | | o- www ................. [/dusays/www.img (1.0GiB) write-back deactivated]
      | |   o- alua ............................................... [ALUA Groups: 1]
      | |     o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | o- pscsi .............................................. [Storage Objects: 0]
      | o- ramdisk ............................................ [Storage Objects: 0]
      o- iscsi ........................................................ [Targets: 0]
      o- loopback ..................................................... [Targets: 0]

    接下来我们创建名为 iqn.2021-01.com.dusays:www 的 iSCSI 文件，一般命名规则为 iqn.年份-月份.网址倒叙:存储文件名称，完整命令为 /iscsi create iqn.2021-01.com.dusays:www，创建后通过 ls 查看执行结果：

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    /> iscsi/ create iqn.2021-01.com.dusays:www
    Created target iqn.2021-01.com.dusays:www.
    Created TPG 1.
    Global pref auto_add_default_portal=true
    Created default portal listening on all IPs (0.0.0.0), port 3260.
    /> ls
    o- / ..................................................................... [...]
      o- backstores .......................................................... [...]
      | o- block .............................................. [Storage Objects: 0]
      | o- fileio ............................................. [Storage Objects: 1]
      | | o- www ................. [/dusays/www.img (1.0GiB) write-back deactivated]
      | |   o- alua ............................................... [ALUA Groups: 1]
      | |     o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | o- pscsi .............................................. [Storage Objects: 0]
      | o- ramdisk ............................................ [Storage Objects: 0]
      o- iscsi ........................................................ [Targets: 1]
      | o- iqn.2021-01.com.dusays:www .................................... [TPGs: 1]
      |   o- tpg1 ........................................... [no-gen-acls, no-auth]
      |     o- acls ...................................................... [ACLs: 0]
      |     o- luns ...................................................... [LUNs: 0]
      |     o- portals ................................................ [Portals: 1]
      |       o- 0.0.0.0:3260 ................................................. [OK]
      o- loopback ..................................................... [Targets: 0]

    创建 LUN 号

    从先前创建的 www 存储中创建 LUN 号，命令为 iscsi/iqn.2021-01.com.dusays:www/tpg1/luns/ create /dusays/www.img，创建后通过 ls 查看执行结果：

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    /> iscsi/iqn.2021-01.com.dusays:www/tpg1/luns/ create /dusays/www.img
    Created storage object dusays-www.img.
    Created LUN 0.
    /> ls
    o- / ..................................................................... [...]
      o- backstores .......................................................... [...]
      | o- block .............................................. [Storage Objects: 0]
      | o- fileio ............................................. [Storage Objects: 2]
      | | o- dusays-www.img ........ [/dusays/www.img (1.0GiB) write-thru activated]
      | | | o- alua ............................................... [ALUA Groups: 1]
      | | |   o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | | o- www ................. [/dusays/www.img (1.0GiB) write-back deactivated]
      | |   o- alua ............................................... [ALUA Groups: 1]
      | |     o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | o- pscsi .............................................. [Storage Objects: 0]
      | o- ramdisk ............................................ [Storage Objects: 0]
      o- iscsi ........................................................ [Targets: 1]
      | o- iqn.2021-01.com.dusays:www .................................... [TPGs: 1]
      |   o- tpg1 ........................................... [no-gen-acls, no-auth]
      |     o- acls ...................................................... [ACLs: 0]
      |     o- luns ...................................................... [LUNs: 1]
      |     | o- lun0 . [fileio/dusays-www.img (/dusays/www.img) (default_tg_pt_gp)]
      |     o- portals ................................................ [Portals: 1]
      |       o- 0.0.0.0:3260 ................................................. [OK]
      o- loopback ..................................................... [Targets: 0]

    为启动器 iqn.2021-01.com.dusays:www 创建 ACL，以便 iSCSI 客户端可以访问此目标中的 LUN，命令为 iscsi/iqn.2021-01.com.dusays:www/tpg1/acls create iqn.2021-01.com.dusays:init 通过 ls 查看执行结果，通过 saveconfig 保存所有的配置，并使用 exit 退出：

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    /> iscsi/iqn.2021-01.com.dusays:www/tpg1/acls create iqn.2021-01.com.dusays:init
    Created Node ACL for iqn.2021-01.com.dusays:init
    Created mapped LUN 0.
    /> ls
    o- / ..................................................................... [...]
      o- backstores .......................................................... [...]
      | o- block .............................................. [Storage Objects: 0]
      | o- fileio ............................................. [Storage Objects: 2]
      | | o- dusays-www.img ........ [/dusays/www.img (1.0GiB) write-thru activated]
      | | | o- alua ............................................... [ALUA Groups: 1]
      | | |   o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | | o- www ................. [/dusays/www.img (1.0GiB) write-back deactivated]
      | |   o- alua ............................................... [ALUA Groups: 1]
      | |     o- default_tg_pt_gp ................... [ALUA state: Active/optimized]
      | o- pscsi .............................................. [Storage Objects: 0]
      | o- ramdisk ............................................ [Storage Objects: 0]
      o- iscsi ........................................................ [Targets: 1]
      | o- iqn.2021-01.com.dusays:www .................................... [TPGs: 1]
      |   o- tpg1 ........................................... [no-gen-acls, no-auth]
      |     o- acls ...................................................... [ACLs: 1]
      |     | o- iqn.2021-01.com.dusays:init ...................... [Mapped LUNs: 1]
      |     |   o- mapped_lun0 ................... [lun0 fileio/dusays-www.img (rw)]
      |     o- luns ...................................................... [LUNs: 1]
      |     | o- lun0 . [fileio/dusays-www.img (/dusays/www.img) (default_tg_pt_gp)]
      |     o- portals ................................................ [Portals: 1]
      |       o- 0.0.0.0:3260 ................................................. [OK]
      o- loopback ..................................................... [Targets: 0]
    /> 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


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