Editing Kyle (section)

===Downloading CentOs & Preparing the Computer===

====STEP 1: Installation====

i.	Click Next on the Centos logo page

ii.	Chose Basic Storage Devices, then click next 

iii.	Chose your installation preference, then click next

iv.	Chose a hostname (name of computer) 

v.	Select the time

vi.	Make a root password

vii.	Now select which type of installation you would like

viii.	Select your hard drive to install target devices

ix.	Then click on boot loader option (small button top left corner in the right window) 

x.	Writing storage configuration to disk, select write changes 

xi.	After some time, select which installation you would like: Desktop is ideal for this setup

xii.	Then wait for the installation to complete

====STEP 2: Create First User====

i.	First user account is going to be the bash shell analysis account (i.e. root, geant4, etc.) 

ii.	Skip the full name portion

iii.	Select date and time

<span style="color:red">'''Possible Issue:''' An error may occur upon selecting the time (CentOs). It is okay to ignore this message for our purposes.</span>

iv.	Click finish on the kdump screen

====STEP 3: Installing Libraries and Updating====
 
i.	Turn on the connection to the internet  

    1.	Go to system, preferences, network connections (GUI)
    2.	Double click System eth0
    3.	Select Connect Automatically and Available for all Users
    4.	Click Apply
    5.	Enter root password to save the information 

ii.	Turn off screen saver (Optional)

    1.	Go to system, preferences, screensaver
    2.	Uncheck the lock option when the computer goes to the screensaver
    3.	Change the elapsed time for the screensaver (~ 40 minutes)
    4.	Click Close

iii.	Open new shell (terminal)

        <span style="color:blue">'''Hint:''' Make sure that you are super user, connected to the internet, and are in the home directory </span>

    1.	$ su
    2.	$ <root password> 
<span style="color:green">'''Link:''' [[Setup Files#Library Script|Library Script]]</span>
    3.	Run the libraries script : # ./lib32_install.sh 
    5. <span style="color:red">  '''Possible Issue:''' DATABASE DISK IMAGE IS MALFORMED. Normally this can be ignored for our purposes.</span>	 
    6.	Once the script is done installing: # yum –y update
    7.	# exit

====STEP 4: Create Second User Account (tcsh)====

i.	Go to system, administration, users and groups (GUI)

ii.	Enter the root user password

iii.	Click Add User

iv.	Enter a username 

v.	No need to enter a full name

vi.	Enter a password

vii.	Change login shell to tcsh

====STEP 5: Network Settings====

i.	Go to system/preferences/network connections (GUI)

ii.	Double click System eth0

iii.	Click ipv4 settings tab

iv.	Method Dropdown: Change from DHCP to manual

v.	Press add button under Addresses 

<span style="color:blue">'''Hint:''' This network setup is meant for a CNU configuration.</span>

vi.	Enter the address: 137.155.2.XX, netmask: 255.255.255.0, and gateway for your network (may need to contact administrator):137.155.2.4 

vii.	Enter the DNS server addresses: 137.155.2.50, 137.155.2.14 (may need administrator)

viii.	Enter the search domain: pcs.cnu.edu (may need administrator)

ix.	Click apply

x.	Enter root password

====STEP 6: Hosts File Changes====

i.	$ su

ii.	$ <root password>

iii.	# vi /etc/hosts

iv.	Within the file add this line: <ip address> <domain name> <computer name>

    1.	Go to a new line in the file
    2.	Example: 137.155.2.58 jlabvme.pcs.cnu.edu jlabvme
    3.	Both computers need to be in the hosts file (i.e. jlabdaq & jlabvme)

v.	Save the file and exit

vi.	# exit

vii.	$ ssh root@jlabvme

viii.	$ <enter password for root@jalbvme>

ix.	# vi /etc/hosts

<span style="color:green">'''Link:''' [[Setup Files#Hosts File|Hosts File]]</span>

x.	Within the hosts file add this line: <ip address> <domain name> <computer name>

xi.	Save the file and exit

xii.	#exit

xiii. Any computers that you wish to ssh into, make sure that they are added to the hosts file.

====STEP 7: Turn Off Firewall (Otherwise add exceptions for the specific machines)====

i.	Go to system/administration/firewall (GUI) 

ii.	Enter root password

iii.	Click Disable

iv.	Click Apply (Look top left corner)

====STEP 8: SSH Without Password====
 
i.	Login to CODA Account

ii.	We are now switching so that all permissions are set to our CODA user account.
 
iii.	Open a new shell (terminal)

iv.	$ su

v.	$ <root password>

vi.	# /sbin/service sshd start

vii.	# exit

viii.	<span style="color:blue">'''Hint:''' Make sure you are in the home directory:  /home/<username></span>

ix.	$ ssh-keygen –t rsa

x.	$ <Press enter three times>

xi.	$ cat .ssh/id_rsa.pub | ssh root@jlabvme ‘cat >> .ssh/authorized_keys’

xii.	type yes

xiii.	$ ssh root@jlabvme “chmod 700 .ssh; chmod 640 .ssh/authorized_keys”

xiv.	$ ssh root@jlabvme

xv.	# exit

xvi. 	Back on the CODA user account: $ ssh-add

<span style="color:green">'''Link:''' If help is needed: http://www.tecmint.com/ssh-passwordless-login-using-ssh-keygen-in-5-easy-steps/</span>