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* In Lab 1, we will be creating customized partitions (as opposed to suggested partitioning default from install program)
<u>Accessing the Administrative Account (root)</u>
Many administrative tasks require the root administrative account. There are many ways to access this administration account:<ul><li>Login: '''root''' (enter root password)</li><li>Switch User to root (without login):<ul><li>'''su''': Remains in regular user's directory, does not run root's startup script(s).</li><li>'''su -''' : Changes to root's home directory (/root) and runs root's start script(s).</li></ul></li></ul>
<u>Obtaining System Information</u>
It is always recommended to document information regarding a newly-installed Operating System for a company or organization. This information usually contains information regarding the OS (Linux distribution, Kernel version, etc) as well as running processes, hostname, etc.
The following table lists the common Linux commands to help generate this OS documentation:
{| cellpadding="5" border="1" cellspacing="0"
|- valign="top"
|<b>Linux Command</b>
|<b>Purpose</b>
|- valign="top"
|''' grep -i packaging /var/log/anaconda/anaconda.packaging.log ¦ wc -l'''
|Obtain information regarding the initial Linux OS installation (including installed packages)
|- valign="top"
|'''rpm -q -a ¦ wc -l'''
|Obtain number of files required to allow package(s) to be installed
|- valign="top"
|'''hostname'''
|Display hostname of Linux machine
|- valign="top"
|'''uname -rv'''
|Display version of Linux kernel
|- valign="top"
|'''ifconfig'''
|Display networking information (including IP ADDR, Netmask)
|- valign="top"
|'''route -n'''
|Display gateway information
|- valign="top"
|'''nslookup'''
|Display nameserver information
|}
<u>Pathname for USB Stick</u>
The default mount location has been changed in linux distributions newer than CentOS. So while we will get '''/media/usb-device-name''',<br> in newer distributions you'll see '''/run/media/userloginid/usb-device-name'''
<u>Disabling SELinux</u>
SELinux stands for '''Security-Enhanced Linux'''. It is a component that helps to better secure the system to protect against intrusion (hackers). SELinux is enabled upon the default install of CentOS. SELinux can be a good thing, if you take care of it and know how it works. For this course it is strongly recommended that you '''disable SELinux by default''' because we won't have the time to reconfigure it every time the labs make it necessary
{{Admon/important |Be Aware of the Following Issues| Be aware of these common mistakes that students make that can cause problems for their future labs.}}
<u>Bring Required Materials to Class</u>
* '''NOTE:''' Remember that the sizes are recorded in MB (eg. 30 GB = 30000 MB) and you should multiply GB by a factor of 1024 to get the correct size.<br> (eg. '''30 GB x 1024 = 30720 MB''')<br><br>
<u>Common Types of File Systems for Linux</u>
Similar to other Operating Systems like windows '''fat''' / '''vfat''' / '''ntfs''' file system types, it is good to know a few common file system types in Linux for comparison:<br><ul><li><b>xfs:</b> Newer filesystem (fast transfer rates for large files, Journaling)</li><li><b>ext4:</b> Newer filesystem supporting large files and Journaling (used in for this lab)</li><li><b>ext2:</b> Stable filesystem popular for databases (no journaling)</li></ul>
* How many files (correct to the nearest hundred) were installed?
* How many users were created automatically on your system (regular, admin)?
* List 3 2 ways that you can access your root account
* What is the difference between the commands '''su''' and '''su -''' ?
* What is the home directory for the user "root"?
