Server: fdisk /var/vdb #Create a partition vda2, where the size is 1G partprobe yum install targetcli.noarch systemctl start target targetcli /> /backstores/block create westos:storage1 /dev/vdb2 ##Establish connection with logical volume, / dev/vdb2 is represented by webstos: storage1 Created block storage object westos:storage1 using /dev/vdb2. /> /iscsi create iqn.2017-12.com.example:storage1 ##Each initiator and target need to be identified by a unique name Created target iqn.2017-12.com.example:storage1. Created TPG 1. /> /iscsi/iqn.2017-12.com.example:storage1/tpg1/acls create iqn.2017-12.com.example:westoskey ##Create client connection server key Created Node ACL for iqn.2017-12.com.example:westoskey /> /iscsi/iqn.2017-12.com.example:storage1/tpg1/luns create /backstores/block/westos:storage1 ##To create a logical unit number in a unit Created LUN 0. Created LUN 0->0 mapping in node ACL iqn.2017-12.com.example:westoskey /> /iscsi/iqn.2017-12.com.example:storage1/tpg1/portals create 172.25.254.11 ##Establish gateway connection, i.e. target portal Using default IP port 3260 Created network portal 172.25.254.11:3260. /> exit firewall-cmd --permanent --add-port=3260/tcp ##Add shared port of shared disk to firewall policy firewall-cmd --reload
client: yum search iscsi ##Looking for iscsi services yum install iscsi-initiator-utils.x86_64 -y systemctl start iscsi [root@client ~]# vim /etc/iscsi/initiatorname.iscsi InitiatorName=iqn.2017-12.com.example:westoskey systemctl restart iscsi [root@client ~]# iscsiadm -m discovery -t st -p 172.25.254.11 ##devices detected 172.25.254.11:3260,1 iqn.2017-12.com.example:storage1 [root@client ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.11 -l ##land Logging in to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] (multiple) Login to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] successful. fdisk -l ##Viewing devices Disk /dev/sda ##One more device found fdisk /dev/sda ##Establish maximum partition mkfs.xfs /dev/sda1 mount /dev/sda1 /mnt/ cd /mnt [root@server ~]# mount /dev/vdb2 /mnt mount: /dev/vdb2 is already mounted or /mnt busy ##Because the client has been mounted, the server cannot mount the same device yum install tree tree /var/lib/iscsi/ //Set power on from: [root@client ~]# blkid /dev/vda1: UUID="9bf6b9f7-92ad-441b-848e-0257cbb883d1" TYPE="xfs" /dev/vdb1: UUID="SIaPf4-OdHu-OzAW-NlQG-vZ3D-X8ZO-1FK3Ih" TYPE="LVM2_member" /dev/mapper/vg0-vo: UUID="12294be2-bdad-4817-b162-038e22313d9f" TYPE="ext4" /dev/sda1: UUID="926567a2-281d-4144-98ac-9fe50b4224b0" TYPE="xfs" [root@client ~]# vim /etc/fstab UUID="926567a2-281d-4144-98ac-9fe50b4224b0" /mnt xfs defaults,_netdev 0 0 ##When there is no writing_ When netdev is used, you need to enter the emergency mode to comment out the contents written in / etc/fstab before restarting [root@client ~]# mount -a [root@client ~]# reboot [root@foundation9 ~]# rht-vmctl poweroff desktop ##It needs to be shut down and turned on for the first time Powering off desktop.. [root@foundation9 ~]# rht-vmctl start desktop Starting desktop.
Change fstab file in emergency mode
Server delete: umount /mnt ##Uninstall first [root@client ~]# vim /etc/fstab ##Delete the configuration content since power on tree /var/lib/iscsi ##see iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.109 -u ##sign out iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.109 -o delete ##delete tree /var/lib/iscsi fdisk -l systemctl restart iscsi [root@client ~]# fdisk -l ##sda will not exist after reboot //Server delete: targetcli /> clearconfig confirm=true
Extension: 1. //Server: //First create an lvm partition and delete the original one fdisk /dev/vdb /dev/vdb2 2048 2099199 1048576 8e Linux LVM partprobe pvcreate /dev/vdb2 vgcreate iscsi_vg /dev/vdb1 vgdisplay ##Find parameters for remaining space lvcreate -l 255 -n iscsi_lv iscsi_vg targetcli ##Establishing a shared lvm disk on the server /> /backstores/block create westos:storage1 /dev/iscsi_vg/iscsi_lv Created block storage object westos:storage1 using /dev/iscsi_vg/iscsi_lv. /> /iscsi create iqn.2017-12.com.example:storage1 Created target iqn.2017-12.com.example:storage1. Created TPG 1. /> iscsi/iqn.2017-12.com.example:storage1/tpg1/acls create iqn.2017-12.com.example:key1 Created Node ACL for iqn.2017-12.com.example:key1 /> /iscsi/iqn.2017-12.com.example:storage1/tpg1/luns create /backstores/block/westos:storage1 Created LUN 0. Created LUN 0->0 mapping in node ACL iqn.2017-12.com.example:key1 /> iscsi/iqn.2017-12.com.example:storage1/tpg1/portals create 172.25.254.11 Using default IP port 3260 Created network portal 172.25.254.11:3260. /> exit //client: [root@client ~]# tree /var/lib/iscsi /var/lib/iscsi |-- ifaces |-- isns |-- nodes |-- send_targets |-- slp `-- static 6 directories, 0 files ##Need to delete the original [root@client ~]# vim /etc/iscsi/initiatorname.iscsi ##Modify password file InitiatorName=iqn.2017-12.com.example:key1 systemctl restart iscsid.service systemctl restart iscsi [root@client ~]# iscsiadm -m discovery -t st -p 172.25.254.11 ##Discovery service, - m detects target, - t specifies the ip and port of target through the iscsi protocol, - p, and the default value of no write port is 3260 172.25.254.11:3260,1 iqn.2017-12.com.example:storage1 [root@client ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.11 -l ##Login service Logging in to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] (multiple) Login to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] successful.
2. //Server extension fdisk /dev/vdb /dev/vdb2 2048 2099199 1048576 8e Linux LVM /dev/vdb3 2099200 4196351 1048576 8e Linux LVM partprobe ##Add an lvm partition to vdb3 [root@server ~]# pvcreate /dev/vdb3 Physical volume "/dev/vdb3" successfully created [root@server ~]# vgextend iscsi_vg /dev/vdb3 Volume group "iscsi_vg" successfully extended [root@server ~]# lvextend -L 1500M /dev/iscsi_vg/iscsi_lv Extending logical volume iscsi_lv to 1.46 GiB Logical volume iscsi_lv successfully resized [root@server ~]# lvs ##see LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert iscsi_lv iscsi_vg -wi-ao---- 1.46g //Client synchronization [root@client ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.11 -u Logging out of session [sid: 2, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] Logout of [sid: 2, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] successful. [root@client ~]# iscsiadm -m node -T iqn.2017-12.com.example:storage1 -p 172.25.254.11 -l ##You need to exit and log in to the client before expansion Logging in to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] (multiple) Login to [iface: default, target: iqn.2017-12.com.example:storage1, portal: 172.25.254.11,3260] successful. [root@client ~]# fdisk -l Disk /dev/sda: 1572 MB
