Tuesday 30 June 2015

Get Red Hat Training to become a highly sought after Linux professional

Red Hat training classes getting even hotter this season
In today's arena, Linux has the biggest user base, similar to how Microsoft dominates on our desktops. It goes without saying that over the years, Linux has increased its dominance aggressively. Presently, there is a growing demand for Linux skilled professionals, who really enjoy better services, like higher pay packs, career boosts and value in the organization etc.

IT is considered as the most important Linux distribution. Linux certification holders are equipped with the knowledge that involves troubleshooting, system administration and installation. To retain and develop their own professional standards, Linux certifications are challenging but with the correct preparation for the certification exams and proper Red Hat hands-on trainings, one may easily pass the exams.

Linux, undoubtedly has much advantage over some of the other leading operating systems, when it comes to IT security sphere, it becomes more prominent. Because of these sharp and well tuned security features, among the other prominent features, many Government and Military agencies has jumped on the Linux and Linux technologies quite early.

Linux training has been growing tremendously over the years; many organizations are providing on-site training classes for groups. There are other options where individuals may also join Linux training classes. There are many learning methodology, like Linux training bootcamps, Red Hat live instructor led virtual classes, Red Hat on-site corporate trainings etc.

Certain LInux certification courses in demand:
RHCSA certification - The recent survey and feedback analysis performed on IT professionals worldwide, shows that Red Hat Certified System Administrator certification is considered as a new addition to the Red Hat's list of performance based certifications. It equips IT professionals with best training and performance based assessments in the industry. RHCSA certification indicates and displays precise and thorough analysis of the knowledge and skills required for the contemporary system administrators.

RHCSA certification is the foundation level system administration certification. Developed lately, for professionals who wish to earn RHCE on RHEL 6 now, must attain RHCSA certification and write separate exam for RHCE. The current certification will still remain the pre-requisite; however RHCE is now upgraded as a higher level system administration certification from Red Hat.

RHCE certification - Being a globally recognized credential, Linux Certified Engineer, is well respected and valued across industry. The IT professionals having cleared this credential displays good level of knowledge in using and troubleshooting Red Hat Enterprise. Some of the topics included are advanced, like package management, kernel configuration, system services, network configuration, mail services and virtualization.

Friday 12 June 2015

How to configure ISCSI target in Redhat 7

@ Motive behind iscsi protocol is to send hard disk (block device) over the network
@ In redhat 7  we are going to setup a cli target
Step 1 :  To setup target you need to install software which is in version 7 (targetcli)
[root@redhat7 Desktop]# yum install targetcli
step 2 : There is no need to start the service or open configuration file so use targetcli command
====
[root@redhat7 Desktop]# targetcli
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type ‘help’.
/>                                                            # this is the prompt of targetcli
i)  To list the architecture of iscsi target
/> 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]
/>
ii) To create a iscsi target block
/> cd  /backstores/block
/backstores/block>
/backstores/block> create  newhd  /dev/sda7
Created block storage object newhd using /dev/sda7.
/backstores/block>
iii)  To  create an  IQN number use below stpes
/backstores/block> cd /iscsi
/iscsi>
/iscsi> create                                                               # create command will automatically IQN number
Created target iqn.2003-01.org.linux-iscsi.redhat7.x8664:sn.66955d1bd65c.
Created TPG 1.
/iscsi>
OR you can give your own IQN number in proper format
/iscsi> create  iqn.2014-10.com.example:iscsit
Created target iqn.2014-10.com.example:iscsit.
Created TPG 1.
/iscsi>
iV)  Now you need to configure the iscsi hard disk for client with given properities like acls , luns , portals
     ==========================================================================================================
/iscsi> cd /iscsi/iqn.2014-10.com.example:iscsit/tpg1/
/iscsi/iqn.20…e:iscsit/tpg1>
/iscsi/iqn.20…e:iscsit/tpg1> ls
o- tpg1 ……………………………………….. [no-gen-acls, no-auth]
  o- acls …………………………………………………. [ACLs: 0]
  o- luns …………………………………………………. [LUNs: 0]
  o- portals ……………………………………………. [Portals: 0]
 A)  Create a portal so that client can connect and access hard disk
 /iscsi/iqn.20…e:iscsit/tpg1> portals  create
Using default IP port 3260
Binding to INADDR_ANY (0.0.0.0)
Created network portal 0.0.0.0:3260.
/iscsi/iqn.20…e:iscsit/tpg1>
Note : IT will automatically create  3260 port binded with all ip of ISCSI server
Important:  You can create you won port and also can bind with any server IP using below step
=========
/iscsi/iqn.20…e:iscsit/tpg1> portals  create   192.168.0.20  1234
Created network portal 192.168.0.20:1234.
/iscsi/iqn.20…e:iscsit/tpg1>
B)  You also need to create a Logical unit number or Luns  for client hard disk
/iscsi/iqn.20…e:iscsit/tpg1> luns/  create /backstores/block/newhd
Created LUN 0.
/iscsi/iqn.20…e:iscsit/tpg1>
C)  By default acls must be implemented in version 7 .To two disable acls use below given steps
i)
/iscsi/iqn.20…fb47f492/tpg1> set  attribute  authentication=0
Parameter authentication is now ‘0’.
/iscsi/iqn.20…fb47f492/tpg1>
ii)
/iscsi/iqn.20…fb47f492/tpg1> set  attribute  generate_node_acls=1
Parameter generate_node_acls is now ‘1’.
/iscsi/iqn.20…fb47f492/tpg1>
Now you can login via any client and use Targetcli from command line which same as Redhat version 6