day5 RHCE
19 、配置 iSCSI 服务端 （***先做这个题目**，挂载重启，机器会挂掉）
配置server0提供一个iSCSI服务磁盘名为iqn.2014-11.com.example:server0,并符合下列要求:
服务端口为3260
使用iscsi_store作为其后端卷，其大小为3G（题意含糊，其实iscsi_store是一个逻辑卷,需要自己建立）
此服务只能被desktop0.example.com访问。
[root@server0 ~]# yum install targetcli.noarch -y [root@server0 ~]# systemctl enable target [root@server0 ~]# systemctl restart target [root@server0 ~]# systemctl status target.service [root@server0 ~]# firewall-cmd --permanent --add-port=3260/tcp [root@server0 ~]# firewall-cmd --reload [root@server0 ~]# ll /dev/sd* [root@server0 ~]# fdisk /dev/sdb p n p +4G p t 8e p w [root@server0 ~]# partprobe [root@server0 ~]# ll /dev/sd* [root@server0 ~]# pvcreate /dev/sdb1 [root@server0 ~]# vgcreate vg1 /dev/sdb1 [root@server0 ~]# lvcreate -L 3G vg1 -n iscsi_store #iscsi_store作为其后端卷 [root@server0 ~]# lvs
[root@server0 ~]# 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]
/> cd backstores/block /backstores/block> ls /backstores/block> create name=LUN0 dev=/dev/iscsi_vg/iscsi_store #定义了一个本地的块设备 /backstores/block> ls /backstores/block> cd /iscsi /iscsi> create iqn.2014-11.com.example:server0 #定义target 的入口 /iscsi> ls /iscsi> cd iqn.2014-11.com.example:server0/tpg1 /iscsi/iqn.20...:server0/tpg1> ls /iscsi/iqn.20...:server0/tpg1> cd acls /iscsi/iqn.20...er0/tpg1/acls> create iqn.2014-11.com.example:desktop0 #允许该名字的客户端访问本iscsi 的tagert /iscsi/iqn.20...:server0/tpg1> cd luns /iscsi/iqn.20...er0/tpg1/luns> create /backstores/block/LUN0 # 把定义好了的块设备通过该target 共享出去 /iscsi/iqn.20...:server0/tpg1> cd portals /iscsi/iqn.20.../tpg1/portals> create ip_address=172.25.0.11 ip_port=3260 /iscsi/iqn.20...:server0/tpg1> ls /iscsi/iqn.20...:server0/tpg1> set attribute authentication=0 #该tgp 关闭帐号验证 /iscsi/iqn.20...:server0/tpg1> set attribute generate_node_acls=0 #该tgp 使用自定义的acl 实现节点访问限制 /> saveconfig /> exit
重启服务，添加防火墙 [root@server0 ~]# firewall-cmd --permanent --add-port=3260/tcp [root@server0 ~]# firewall-cmd --reload [root@server0 ~]# systemctl enable target.service [root@server0 ~]# systemctl restart target.service [root@server0 ~]# systemctl status target.service
[root@server0 ~]# targetcli /> ls o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 1] | | o- LUN0 ......................................................... [/dev/iscsi_vg/iscsi_store (3.0GiB) write-thru activated] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 0] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2014-11.com.example:server0 ................................................................................... [TPGs: 1] | o- tpg1 ............................................................................................... [no-gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 1] | | o- iqn.2014-11.com.example:desktop0 ..................................................................... [Mapped LUNs: 1] | | o- mapped_lun0 .................................................................................. [lun0 block/LUN0 (rw)] | o- luns .......................................................................................................... [LUNs: 1] | | o- lun0 ...................................................................... [block/LUN0 (/dev/iscsi_vg/iscsi_store)] | o- portals .................................................................................................... [Portals: 1] | o- 0.0.0.0:3260 ..................................................................................................... [OK] o- loopback ......................................................................................................... [Targets: 0]
20 、配置 iSCSI 的客户端
配置desktop0使其能连接在server0上提供的iqn.2014-11.com.example:server0并符合以下要求：
iSCSI设备在系统启动的时候自动加载
块设备iSCSI上包含一个大小为2100 MiB的分区，并格式化为ext4。
此分区挂载在/mnt/data上同时在系统启动的期间自动挂载。
[root@desktop0 ~]# yum install iscsi-initiator-utils.i686 -y #安装客户端软件包 [root@desktop0 ~]# vim /etc/iscsi/initiatorname.iscsi #配置iscsi 客户端的名字 InitiatorName=iqn.2014-11.com.example:desktop0 [root@desktop0 ~]# systemctl enable iscsi [root@desktop0 ~]# systemctl restart iscsi [root@desktop0 ~]# systemctl status iscsi [root@desktop0 ~]# systemctl enable iscsid [root@desktop0 ~]# systemctl restart iscsid [root@desktop0 ~]# systemctl status iscsid [root@desktop0 ~]# iscsiadm --help iscsiadm -m discovery [ -hV ] [ -d debug_level ] [-P printlevel] [ -t type -p ip:port -I ifaceN ... [ -Dl ] ] [root@desktop0 ~]# iscsiadm -m discovery -t st -p 172.25.0.11 #发现target [root@desktop0 ~]# iscsiadm -m discovery -t st -p 172.25.0.11 -l #登录target [root@desktop0 ~]# yum install lsscsi.x86_64 -y [root@desktop0 ~]# lsscsi #查看 [33:0:0:0] disk LIO-ORG LUN0 4.0 /dev/sdc #分区格式化，开机挂载 [root@desktop0 ~]# fdisk /dev/sdc p n p +2100M w [root@desktop0 ~]# partprobe [root@desktop0 ~]# ll /dev/sd* [root@desktop0 ~]# mkfs.ext4 /dev/sdc1 [root@desktop0 ~]# mkdir -pv /mnt/data [root@desktop0 ~]# mount /dev/sdc1 /mnt/data [root@desktop0 ~]# mount -a [root@desktop0 ~]# df -h [root@desktop0 ~]# blkid [root@desktop0 ~]# vim /etc/fstab #挂载的时候需要添加_netdev参数 UUID=f5c9e6ae-c0b0-401d-beb0-96da19cd23dc /mnt/data ext4 defaults,_netdev 0 0 注意：添加_netdev，不然机子启动不起来 [root@desktop0 ~]# mount -a [root@desktop0 ~]# df -h [root@desktop0 ~]# shutdown 关机（等待一会）！！ 不要重启（重启机子就崩溃了，手动开机） （关机：1011错误）
