Redhat / CentOS / AlmaLinux

Objective

The objective is to configure network Redhat package repository accessible via FTP protocol. This guide uses vsftpd as a means to provide FTP access to the package repository.

Operating System and Software Versions

• Operating System: – Red Hat Enterprise Linux Server 7.3 (Maipo)
• Software: – vsftpd: version 3.0.2

Requirements

Privileged access to your RHEL server system will be required.

Difficulty

EASY

Conventions

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Objective

In case you have troubles with GUI RHEL installation, Redhat also offers text bases solution.

Operating System and Software Versions

• Operating System: – Redhat Linux 7.3

Requirements

Redhat Linux bootable CD/DVD or USB media.

Difficulty

EASY

Conventions

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Objective

The objective is to disable the default Apache (httpd) welcome page on Redhat Linux

Operating System and Software Versions

• Operating System: – Red Hat Enterprise Linux Server 7.3 (Maipo)
• Software: – Apache/2.4.6 (Red Hat Enterprise Linux)

Requirements

Privileged access to your RHEL server system will be required.

Difficulty

EASY

Conventions

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Below are basic configuration instructions to setup static IP address on Redhat Enterprise Linux ( RHEL7 ). First, list your network interfaces with ip command:

# ip addr show
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:15:38:b7 brd ff:ff:ff:ff:ff:ff
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe15:38b7/64 scope link 
       valid_lft forever preferred_lft forever

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If you currently do not hold a Red Hat Subscription and yet you need to enable EPEL ( Extra Packages for Enterprise Linux ) repository on your RHEL 7 Linux you need to download and install following file directly from Fedora project:

epel-release-7-5.noarch.rpm

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There are number of ways how to find you what Redhat Linux version is my server running on. First check /etc/os-release file:

# cat /etc/os-release 
NAME="Red Hat Enterprise Linux Server"
VERSION="7.0 (Maipo)"
ID="rhel"
ID_LIKE="fedora"
VERSION_ID="7.0"
PRETTY_NAME="Red Hat Enterprise Linux Server 7.0 (Maipo)"

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In this config we are going to configure a network interface to receive an IP configuration settings from DHCP server. First get the name of the network interface you would like to set as DHCP client. To do this you can run command:

# ip addr show
2: enp0s3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:15:38:b7 brd ff:ff:ff:ff:ff:ff
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe15:38b7/64 scope link 
       valid_lft forever preferred_lft forever

Once we have located a name of the network interface in question open a corresponding configuration file. So as an example, for network interface epn0s3 vi will edit a /etc/sysconfig/network-scripts/ifcfg-enp0s3. Open this file and enter the minimum configuration settings in order to make this network interface act as a DHCP client:

DEVICE=enp0s3
BOOTPROTO=dhcp
ONBOOT=yes

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Instead of changing a hostname on your Redhat 7 server manually by editing /etc/hostname you may preferably use a dedicated command hostnamectl to do this job. By default when no other options are supplied the hostnamectl command will display basic information including static hostname:

[root@rhel7 ~]# hostnamectl 
   Static hostname: rhel7
         Icon name: computer
           Chassis: n/a
        Machine ID: 75387b56d72b44b380810499805ec28a
           Boot ID: 6ad251d0e12a10e3af1894eae5fe5cb6
    Virtualization: oracle
  Operating System: Red Hat Enterprise Linux Server 7.0 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.0:GA:server
            Kernel: Linux 3.10.0-123.el7.x86_64
      Architecture: x86_64

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The following linux command will list all available locales currently available on the Redhat 7 system:

[root@rhel7 ~]# localectl list-locales

The list of all available locales on your system my be quite long so use grep command to narrow down your search. Bellow command will display for example all German available locales:

[root@rhel7 ~]# localectl list-locales | grep ^de
de_AT
de_AT.iso88591
de_AT.iso885915@euro
de_AT.utf8
de_AT@euro
de_BE
de_BE.iso88591
de_BE.iso885915@euro
de_BE.utf8
de_BE@euro
de_CH
de_CH.iso88591
de_CH.utf8
de_DE
de_DE.iso88591
de_DE.iso885915@euro
de_DE.utf8
de_DE@euro
de_LU
de_LU.iso88591
de_LU.iso885915@euro
de_LU.utf8
de_LU@euro
deutsch

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Use localectl to see your currently active locale on Redhat 7 Linux. For example:

[root@rhel7 ~]# localectl
   System Locale: LANG=en_AU.UTF-8
       VC Keymap: us
      X11 Layout: us

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Changing a timezone on Redhat 7 Linux server is a easy task which can be done on a command line with a few commands. First find your timezone using timedatectl command. The following linux command will list all timezones:

[root@rhel7 ~]# timedatectl list-timezones

To narrow down the search you can use grep to search for a specific city. For example:

[root@rhel7 ~]# timedatectl list-timezones | grep -i bratislava
Europe/Bratislava

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When not using NTP you may need to set your system time manually. You have two options to set time and date on your RHEL7 linux. First option is to use date command to do this job or engage dedicated systemd timedatectl command. By default and without any arguments timedatectl will display a current time, local, universal and RTC times:

[root@rhel7 ~]# localectl
   System Locale: LANG=en_AU.iso88591
       VC Keymap: us
      X11 Layout: us
[root@rhel7 ~]# timedatectl
      Local time: Thu 2014-09-04 18:30:11 WST
  Universal time: Thu 2014-09-04 10:30:11 UTC
        RTC time: Thu 2014-09-04 10:30:10
        Timezone: Australia/Perth (WST, +0800)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a

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