DokuWiki » Infrastructure » Operating System » CentOS 7

h1. Install Procedure for CentOS 7.x

I want to say first that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take.

h2. 1 Requirements

To install such a system you will need the following:

* Download the two CentOS 7.x DVDs from a mirror next to you (the list of mirrors can be found here: http://isoredirect.centos.org/centos/6/isos/x86_64/).

* a fast Internet connection.

h2. 2 Preliminary Note

In this tutorial I use the hostname @server1.example.com@ with the IP address @192.168.0.100@ and the gateway @192.168.0.1@. These settings might differ for you, so you have to replace them where appropriate.

h2. 3 Configure The Base System

Boot from your first CentOS 7.x DVD. 

As it can take a long time to test the installation media we skip this test here and press @<ENTER>@ at the boot prompt: 

!{width 500}centos7_inst01.png!

Choose your language next: 

!{width 500}centos7_inst02.png!

Instead of the step-by-step approach the previous CentOS-installer took, CentOS 7 uses a central point of configuration.

We will enter each section and return until all our settings are done.

!{width 500}centos7_inst03.png!

h3. Network & Hostname

Set the hostname manually, e.g. @server1.example.com@

Enable the network interfaces and @configure@ each of them

!{width 500}centos7_inst04.png!

On to the configure network. The default setting here is to configure the network interfaces with DHCP, but we are installing a server, so static IP addresses are not a bad idea… Click on the Edit button after selecting the interface. 

!{width 500}centos7_inst07.png!

In the window that pops up uncheck Dynamic IP configuration (DHCP) and Enable IPv6 support and give your network card a static IP address (in this tutorial I'm using the IP address 192.168.0.100 for demonstration purposes) and a suitable netmask (e.g. 255.255.255.0; if you are not sure about the right values, http://www.subnetmask.info might help you) also enter a gateway (e.g. 192.168.0.1) and up to two DNS servers (e.g. 8.8.8.8 and 145.253.2.75). By default all interfaces are not connected automatically, in most cases you want to change this. 

!{width 500}centos7_inst06.png!

h3. Date & Time

Choose your time zone:

Check Date and Time, as many services are very dependant on the timestamp you should set an approprate time-server or even better a time-server-pool. If you have internet access and are based in germany you might want to use following public NTP-server-pool.

<pre><code class="bash">

0.de.pool.ntp.org

1.de.pool.ntp.org

2.de.pool.ntp.org

3.de.pool.ntp.org

</code></pre>

check www.ntp.org for details. If you don't have access to a public NTP-server ask your admin for a local NTP-server. 

!{width 500}centos7_inst08.png!

h3. Keyboard

Select your keyboard layout: 

!{width 500}centos7_inst09.png!

h3. Installation Source

you may point to a local source or a web-based-server

!{width 500}centos7_inst10.png!

h3. Software Selection

for this example we go for a standard @GNOME-Desktop@

But you may want to consider a more appropriate selection for your system.

!{width 500}centos7_inst11.png!

h3. Installation Destination NON-RAID

Typically you will choose @Local Standard Disks@ here 

!{width 500}centos7_inst12.png!

Now we must select a partitioning scheme for our installation. Usually you will want to configure the layout on your own.

!{width 500}centos7_inst13.png!

This will result in a small @/boot@ and a large @/@ partition as well as a swap partition. Of course, you're free to partition your hard drive however you like it.

|_. type                  |_. logical volume name |_. mount point |_. size |

|_. small database server | lv_swap             | swap        |   512|

|_.                       | lv_home             | \home       |  1024|

|_.                       | lv_var_log          | \var\log    |  1024|

|_.                       | lv_var              | \var        |  8192|

|_.                       | lv_root             | \           |  8192|

Click on @Done@ to continue: 

!{width 500}centos7_inst14.png!

* The hard drive is going to be formatted

* After the drive being formatted the partitioning layout needs to be written to disk

h3. Installation Destination RAID1

taken from: https://www.tuxfixer.com/centos-7-installation-with-lvm-raid-1-mirroring/

Select both disks from the available devices and choose “I will configure partitioning” option:

!{width 500}centos7_inst_raid1_01.png!

h2. 4 Install The Base System

!{width 500}centos7_inst15.png!

!{width 500}centos7_inst16.png!

h3. Set ROOT password

Give @root@ a password: 

!{width 500}centos7_inst17.png!

h3. Create Additional User

you should always have a user even in a server environment. Use your root access only when necessary to prevent unintended changes to the system. 

!{width 500}centos7_inst18.png!

!{width 500}centos7_inst19.png!

!{width 500}centos7_inst20.png!

h2. Initial Setup

!{width 500}centos7_inst21.png!

h3. Licence Information

!{width 500}centos7_inst22.png!

!{width 500}centos7_inst23.png!

If you enable kdump, you may want to stay with the preset defaults. 

Let's go Finish

!{width 500}centos7_inst24.png!

Finally, the installation is complete, and you can remove your CD or DVD from the computer and reboot it:

Welcome to your GNOME-Desktop-Environment.

After finishing our installation let's login the very first time.

!{width 500}centos7_inst25.png!

We change the screen to a text console via @CTRL-ALT-F2@

Please provide your username @root@. Do you still remember the password you thought of a few minutes ago? 

!{width 500}centos7_inst26.png!

get all the latest updates via @yum update@

!{width 500}centos7_inst27.png!

The installation begins. This will take a few minutes:

h2. 5 Post Installation Steps

h3. Install additional packages

With @minimal Desktop@ the most important packages are already installed. If you are curious about installed and available package-groups use

<pre><code class="bash">

yum grouplist

</code></pre>

and install additional groups via

<pre><code class="bash">

yum groupinstall "xxx"

</code></pre>