CentOS 8.x iSCSI target server setup
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To setup CentOS 8.x machine for iSCSI target use:
- Create appropriate file-system and mount it at desired location (eg /backstores) to be used for storing iSCSI disk images (parted, mkfs.ext4, /etc/fstab, mount -a, df -h, etc.)
- Install targetcli package using:
- dnf -y install epel-release
- dnf -y install targetcli
- Clear existing configuration (if any) using:
- targetcli clearconfig confirm=true
- Go to /backstores in OS and create desired backing store using:
- cd /backstores
- qemu-img create -f raw primary.iscsi 800G
- where primary.iscsi is name of iSCSI backing store file and 800G is its size
- Run targetcli and configure it using:
#Create file to be used as iscsi backstore cd /backstores/fileio create primary /backstores/primary.iscsi cd .. ls #Note that we can also use block devices using /backstores/block cd /iscsi #This will create IQN number automatically #Ideally we should create different iqn numbers for every backstore #So that there is flexibility on client side. We can run #create multiple times to create different iqn numbers. create cd iqn.<press-tab-to-autocomplete> #Create lun cd tpg1/luns create /backstores/fileio/primary #Allow client IQN numbers without authentication cd ../acls create <client1-iscsi-initiator-name> create <client2-iscsi-initiator-name> #Save and exit cd / saveconfig exit
- Client initiator name is located in file '/etc/iscsi/initiatorname.iscsi'. Take only value after 'InitiatorName=' starting with 'iqn.'
- Configure service to start on system boot and also start it for current run:
- systemctl enable target
- systemctl start target
- Disable firewall or given exception for port 3260
- systemctl disable firewalld
- systemctl stop firewalld
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