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= Preparing for Lab 1=
== Thinking Ahead Purpose of Lab1 ==
The Linux OS you will be installing in this lab will be a Host Machine (''hostname'': '''c7host''') that will allow you to run '''Virtualization Software''' to create 3 separate virtual machines (to be performed in lab2). It is important to install this host machine correctly since other labs will depend on the stability of this host machine. <u>Main objectives</u>: * '''Correctly install the CentOS 7 FULL INSTALL DVD''' (not LIVE DVD) on your removable hard disk. * '''Record installation characteristics of CentOS 7 FULL INSTALL''' in a chart (contained in lab2 logbook chart) to compare with other installation methods performed in lab2. * '''Verify correct settings''' prior to proceeding with host installation stages. * '''Obtain Linux server information after installation''' to create a software asset report for later access. * '''Disable Linux Kernel security enhancements''' to allow easier internal networking connections (to be reactivated in a later lab). * Observe that '''Bash Shell Scripts can automate routine tasks'''. <u>Hard Disk Partitioning</u> * '''Hard Disk partitions are simply smaller logical storage units''' (containers) within a hard disk * <u>'''Advantages of Hard Disk Partitions'''</u>:* Separation of operating system files from data (easier recovery):* Allows for booting multiple operating systems:* Separation of Data for efficient access and sharing * 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 == Common Mistakes / Warnings == {{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> : '''Come prepared for labs:'''
:* '''Removable SATA Drive''' ( min 250 GB )
:* '''USB Stick''' ( min 8 GB )
:* '''Access to Lab Instructions''': printout, notebook, netbook, smartphone
[[Category:OPS235]][[Category:'''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>OPS235 Labs]]