iSCSI Configuration on RHEL 7 \/ CentOS 7 <\/p>\n
Step 1: First you need to create partition <\/p>\n
[root@server1 ~]# fdisk -c \/dev\/sdb <\/p>\n
Press ‘p’ to print partition table <\/p>\n
Press ‘n’ to create a new partition <\/p>\n
Press ‘p’ to create primary partition <\/p>\n
Type Partition Number : 1<\/p>\n
First Sector : PRESS ENTER <\/p>\n
Last Sector : +1G<\/p>\n
Press ‘p’ to print partition tables again <\/p>\n
Press ‘t’ to change partition ID <\/p>\n
Type your partition Number :1<\/p>\n
Type Partition code : 8e<\/p>\n
Press ‘p’ to print partition tables again<\/p>\n
Press ‘w’ to save and exit
\nStep 2: if required, use partprobe command to update partition table entry into kernel. <\/p>\n
[root@server1 ~]# partprobe \/dev\/sdb<\/p>\n
Step 3: Now create a Logical Volume using \/dev\/sdb1 partition <\/p>\n
[root@server1 ~]# pvcreate \/dev\/sdb1<\/p>\n
[root@server1 ~]# vgcreate iSCSI_vg \/dev\/sdb1<\/p>\n
[root@server1 ~]# lvcreate -n iscsi_lv1 -l 100%FREE iSCSI_vg <\/p>\n
Step 4: First you need to install “targetcli” package<\/p>\n
[root@server1 ~]# yum install targetcli -y <\/p>\n
Step 5: Now run targetcli with no options to enter into interactive mode: <\/p>\n
[root@server1 ~]# targetcli <\/p>\n
\/> ls<\/p>\n
Now Configure the existing \/dev\/iSCSI_vg\/iscsi_lv1 logical volume as a block-type backing store using the name of “server1.disk1”. <\/p>\n
\/> cd backstores\/<\/p>\n
\/backstores> ls<\/p>\n
\/backstores> cd block <\/p>\n
\/backstores\/block> ls<\/p>\n
\/backstores\/block> create server1.disk1 \/dev\/iSCSI_vg\/iscsi_lv1 <\/p>\n
\/backstores\/block> ls<\/p>\n
Now Create a unique iSCSI Qualified Name (IQN) for the target. <\/p>\n
\/backstores\/block> cd \/iscsi <\/p>\n
\/iscsi> create iqn.2014-10.com.example.server1:iscsi-1<\/p>\n
Now an ACL for client node (initiator). the initiator will be connecting with it’s initiator name. <\/p>\n
\/iscsi> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-1\/tpg1\/acls <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/acls> create iqn.2014-10.com.example.com.server1:server2
\n Now set username and password into ACL to access this LUN <\/p>\n
\/> cd iqn.2014-10.com.example.com.server1:server2<\/p>\n
\/> set auth userid=user1<\/p>\n
\/> set auth password=password <\/p>\n
Now Create a LUN under the target, The LUN should use the previously defined backing storage device named “server1.disk1″ <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/acls> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-1\/tpg1\/luns <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/luns> create \/backstores\/block\/server1.disk1 <\/p>\n
Now Configure a portal for the target to listen on 192.168.0.254<\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/luns> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-1\/tpg1\/portals <\/p>\n
\/iscsi\/iqn.20…\/tpg1\/portals> create 192.168.0.254<\/p>\n
Now view, verify and save the target server configuration <\/p>\n
\/iscsi\/iqn.20…\/tpg1\/portals> cd \/<\/p>\n
\/> ls<\/p>\n
Now Save this configuration<\/p>\n
\/> saveconfig<\/p>\n
\/> exit<\/p>\n
NOTE-: this configuration will be saved to ” ~]# cat \/etc\/target\/saveconfig.json” <\/p>\n
Step 6: Now Enable and Start target service <\/p>\n
[root@server1 ~]# systemctl enable target.service <\/p>\n
[root@server1 ~]# systemctl restart target.service
\n [root@server1 ~]# systemctl status target.service <\/p>\n
Step 7: Now Configure firewall to allow target service
\n [root@server1 ~]# firewall-cmd –permanent –add-port=3260\/tcp
\n [root@server1 ~]# firewall-cmd –reload <\/p>\n
Accessing iSCSI Storage with CHAP Authentication <\/p>\n
Step 1: First you need to install iSCSI initiator package <\/p>\n
[root@server2 ~]# yum install iscsi-initiator-utils -y <\/p>\n
Step 2: Now Create a unique iSCSI IQN name for the client initiator. Otherwise you will not able to connect\/login into IQN<\/p>\n
[root@server2 ~]# vim \/etc\/iscsi\/initiatorname.iscsi <\/p>\n
InitiatorName=iqn.2014-10.com.example.server1:server2
\n :wq (save and exit) <\/p>\n
Step 3: Now you need to modify “\/etc\/iscsi\/iscsid.conf” to provide username and password for chap authentication <\/p>\n
[root@server2 ~]# vim \/etc\/iscsi\/iscsid.conf <\/p>\n
# line 54: uncomment<\/p>\n
node.session.auth.authmethod = CHAP <\/p>\n
# line 58,59: uncomment and specify the username and password you set on the iSCSI target server<\/p>\n
node.session.auth.username = user1<\/p>\n
node.session.auth.password = password
\n :wq (save and exit) <\/p>\n
Step 4: Now Enable and start iscsi client service
\n [root@server2 ~]# systemctl restart iscsid.service <\/p>\n
[root@server2 ~]# systemctl enable iscsid.service <\/p>\n
Step 5: Now discover target using the following command: <\/p>\n
[root@server2 ~]# iscsiadm -m discovery -t st -p 192.168.0.254<\/p>\n
Step 6: Confirm status after discovery<\/p>\n
[root@server2 ~]# iscsiadm -m node -o show <\/p>\n
Step 7: Now connect\/login the discovered target into system <\/p>\n
[root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:tgt1 -p 192.168.0.254 -l
\nStep 8: Confirm the established session<\/p>\n
[root@server2 ~]# iscsiadm -m session -o show <\/p>\n
Step 9: Confirm the partitions<\/p>\n
[root@server2 ~]# cat \/proc\/partitions <\/p>\n
Step 10: Create label, create a new primary partition, format it using xfs file system and the mount it on \/mnt directory. <\/p>\n
[root@server2 ~]# parted –script \/dev\/sdb “mklabel msdos” <\/p>\n
[root@server2 ~]# parted –script \/dev\/sdb “mkpart primary 0% 100%” <\/p>\n
[root@server2 ~]# mkfs.xfs -i size=1024 -s size=4096 \/dev\/sdb1 <\/p>\n
[root@server2 ~]# mount \/dev\/sdb1 \/mnt <\/p>\n
[root@server2 ~]# df -hT
\nStep 11: Now make it persistent entry to mount at booting
\n [root@server2 ~]# blkid <\/p>\n
Now Copy the UUID of \/deb\/sdb1 and paste it into \/etc\/fstab as following: <\/p>\n
[root@server2 ~]# vim \/etc\/fstab <\/p>\n
UUID=”be41aa12-1e30-4678-8c19-da3506df1d84″ \/mnt xfs _netdev 0 0
\n :wq (save and exit) <\/p>\n
[root@server2 ~]# umount \/mnt\/<\/p>\n
[root@server2 ~]# mount -a<\/p>\n
[root@server2 ~]# df -h Step 12: Now unmount the iSCSI Storage <\/p>\n
[root@server2 ~]# cd <\/p>\n
[root@server2 ~]# umount \/mnt\/<\/p>\n
[root@server2 ~]# vim \/etc\/fstab <\/p>\n
Remove the following entry form this file<\/p>\n
UUID=”be41aa12-1e30-4678-8c19-da3506df1d84″ \/mnt xfs _netdev 0 0
\n :wq (save and exit)<\/p>\n
To Disconnect iSCSI storage <\/p>\n
[root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:tgt1 -p 192.168.0.254 -u<\/p>\n
To delete cache as well <\/p>\n
[root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:tgt1 -p 192.168.0.254 -o delete <\/p>\n
Now if you want to connect it again, you need to discover it again. <\/p>\n
Configuring iSCSI Targets without CHAP Authentication <\/p>\n
Step 1: First you need to create partition <\/p>\n
[root@server1 ~]# fdisk -c \/dev\/sdc <\/p>\n
Press ‘p’ to print partition table <\/p>\n
Press ‘n’ to create a new partition <\/p>\n
Press ‘p’ to create primary partition <\/p>\n
Type Partition Number : 1<\/p>\n
First Sector : PRESS ENTER <\/p>\n
Last Sector : +1G<\/p>\n
Press ‘p’ to print partition tables again <\/p>\n
Press ‘t’ to change partition ID <\/p>\n
Type your partition Number :1<\/p>\n
Type Partition code : 8e<\/p>\n
Press ‘p’ to print partition tables again<\/p>\n
Press ‘w’ to save and exit <\/p>\n
Step 2: if required, use partprobe command to update partition table entry into kernel. <\/p>\n
[root@server1 ~]# partprobe \/dev\/sdc<\/p>\n
Step 3: Now create a Logical Volume using \/dev\/sdc1 partition
\n [root@server1 ~]# pvcreate \/dev\/sdc1<\/p>\n
[root@server1 ~]# vgcreate iSCSI_vg2 \/dev\/sdc1<\/p>\n
[root@server1 ~]# lvcreate -n iscsi_lv2 -l 100%FREE iSCSI_vg2 <\/p>\n
Step 4: First you need to install “targetcli” package<\/p>\n
[root@server1 ~]# yum install targetcli -y <\/p>\n
Step 5: Now run targetcli with no options to enter into interactive mode: <\/p>\n
[root@server1 ~]# targetcli <\/p>\n
\/> ls<\/p>\n
Now Configure the existing \/dev\/iSCSI_vg2\/iscsi_lv2 logical volume as a block-type backing store using the name of “server1.disk2”. <\/p>\n
\/> cd backstores\/<\/p>\n
\/backstores> ls<\/p>\n
\/backstores> cd block <\/p>\n
\/backstores\/block> ls<\/p>\n
\/backstores\/block> create server1.disk2 \/dev\/iSCSI_vg2\/iscsi_lv2 <\/p>\n
\/backstores\/block> ls<\/p>\n
Now Create a unique iSCSI Qualified Name (IQN) for the target. <\/p>\n
\/backstores\/block> cd \/iscsi <\/p>\n
\/iscsi> create iqn.2014-10.com.example.server1:iscsi-2<\/p>\n
Now an ACL for client node (initiator). the initiator will be connecting with it’s initiator name. <\/p>\n
\/iscsi> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-2\/tpg1\/acls <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/acls> create iqn.2014-10.com.example.com.server1:tgt1<\/p>\n
By default authentication is enabled. To disable it: <\/p>\n
\/> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-2\/tgp1\/<\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1> set attribute authentication=0<\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1> set attribute generate_node_acls=1<\/p>\n
Now Create a LUN under the target, The LUN should use the previously defined backing storage device named “server1.disk2″ <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/acls> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-2\/tpg1\/luns <\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/luns> create \/backstores\/block\/server1.disk2 <\/p>\n
Now Configure a portal for the target to listen on 192.168.0.254<\/p>\n
\/iscsi\/iqn.20…i-1\/tpg1\/luns> cd \/iscsi\/iqn.2014-10.com.example.server1:iscsi-2\/tpg1\/portals <\/p>\n
\/iscsi\/iqn.20…\/tpg1\/portals> create 192.168.0.254<\/p>\n
Now view, verify and save the target server configuration <\/p>\n
\/iscsi\/iqn.20…\/tpg1\/portals> cd \/<\/p>\n
\/> ls<\/p>\n
Now Save this configuration<\/p>\n
\/> saveconfig<\/p>\n
\/> exit<\/p>\n
NOTE-: this configuration will be saved to ” ~]# cat \/etc\/target\/saveconfig.json” <\/p>\n
Step 6: Now Enable and Start target service <\/p>\n
[root@server1 ~]# systemctl enable target.service <\/p>\n
[root@server1 ~]# systemctl restart target.service
\n [root@server1 ~]# systemctl status target.service <\/p>\n
Step 7: Now Configure firewall to allow target service <\/p>\n
[root@server1 ~]# firewall-cmd –permanent –add-port=3260\/tcp
\n [root@server1 ~]# firewall-cmd –reload <\/p>\n
Accessing iSCSI Storage without CHAP Authentication <\/p>\n
Step 1: First you need to install iSCSI initiator package
\n [root@server2 ~]# yum install iscsi-initiator-utils -y <\/p>\n
Step 2: Now Create a unique iSCSI IQN name for the client initiator. Otherwise you will not able to connect\/login into IQN<\/p>\n
[root@server2 ~]# vim \/etc\/iscsi\/initiatorname.iscsi <\/p>\n
InitiatorName=iqn.2014-10.com.example.server1:tgt1<\/p>\n
:wq (save and exit) <\/p>\n
Step 3: Now Enable and start iscsi client service <\/p>\n
[root@server2 ~]# systemctl restart iscsid.service <\/p>\n
[root@server2 ~]# systemctl enable iscsid.service <\/p>\n
Step 4: Now discover target using the following command:
\n [root@server2 ~]# iscsiadm -m discovery -t st -p 192.168.0.254<\/p>\n
Step 5: Now you need to connect iscsi storage into system <\/p>\n
[root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:iscsi-2 -p 192.168.0.254 -l <\/p>\n
[root@server2 ~]# fdisk -l <\/p>\n
Step 6: Create label, create a new primary partition, format it using xfs file system and the mount it on \/iscsi2 directory. <\/p>\n
[root@server2 ~]# parted –script \/dev\/sdb “mklabel msdos” <\/p>\n
[root@server2 ~]# parted –script \/dev\/sdb “mkpart primary 0% 100%” <\/p>\n
[root@server2 ~]# mkfs.xfs -i size=1024 -s size=4096 \/dev\/sdb1 <\/p>\n
[root@server2 ~]# mount \/dev\/sdb1 \/iscsi2<\/p>\n
[root@server2 ~]# df -hT <\/p>\n
Step 7: Now make it persistent entry to mount at booting <\/p>\n
[root@server2 ~]# blkid <\/p>\n
Now Copy the UUID of \/deb\/sdc1 and paste it into \/etc\/fstab as following: <\/p>\n
[root@server2 ~]# vim \/etc\/fstab <\/p>\n
UUID=”be41aa12-1e30-4678-8c19-da3506df1d84″ \/iscsi2 xfs _netdev 0 0<\/p>\n
:wq (save and exit) <\/p>\n
[root@server2 ~]# umount \/mnt\/<\/p>\n
[root@server2 ~]# mount -a<\/p>\n
[root@server2 ~]# df -h <\/p>\n
Step 8: Now unmount the iSCSI Storage <\/p>\n
[root@server2 ~]# cd <\/p>\n
[root@server2 ~]# umount \/iscsi2<\/p>\n
[root@server2 ~]# vim \/etc\/fstab <\/p>\n
Remove the following entry form this file<\/p>\n
UUID=”be41aa12-1e30-4678-8c19-da3506df1d84″ \/mnt xfs _netdev 0 0<\/p>\n
:wq (save and exit)<\/p>\n
To Disconnect iSCSI storage <\/p>\n
root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:iscsi-2 -p 192.168.0.254 -u<\/p>\n
To delete cache as well <\/p>\n
[root@server2 ~]# iscsiadm -m node -T iqn.2014-10.com.example.server1:iscsi-2 -p 192.168.0.254 -o delete <\/p>\n
Now if you want to connect it again, you need to discover it again.
\nNOTE-: iSCSI store caching in \/var\/lib\/iscsi\/ directory sometimes when we try to add another iscsi targets, system takes some information
\n from cache. so you have two option to address it. <\/p>\n
1. reboot your system <\/p>\n
2. remove iscsi cache <\/p>\n
To remove nodes cache
\n [root@server2 ~]# rm -rf \/var\/lib\/iscsi\/nodes\/*<\/p>\n
To remove send_targets cache <\/p>\n
[root@server2 ~]# rm -rf \/var\/lib\/iscsi\/send_targets\/*<\/p>\n","protected":false},"excerpt":{"rendered":"
iSCSI Configuration on RHEL 7 \/ CentOS 7 <\/p>\n
Step 1: First you need to create partition <\/p>\n
[root@server1 ~]# fdisk -c \/dev\/sdb <\/p>\n
Press ‘p’ to print partition table <\/p>\n
Press ‘n’ to create a new partition <\/p>\n
Press ‘p’ to create primary partition <\/p>\n
Type Partition Number : […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[73],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5930"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5930"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5930\/revisions"}],"predecessor-version":[{"id":5931,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5930\/revisions\/5931"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}