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)"
PRETTY_NAME="Red Hat Enterprise Linux Server 7.0 (Maipo)"

In this short config we will install FTP file Server on RHEL7 Linux using vsftpd. We will stick to the default vsftpd configuration which enables user accounts on our existing RHEL7 Linux system to login via FTP from a remote location, list and transfer files. Let's begin by the installation:

To install FTP server on Redhat 7 Linux we can use either tftp-server or vsftpd daemon. In this guide we use vsftpd:
[root@rhel7 ~]# yum install vsftpd
Next, we can start the vsftpd service by using a service command:
[root@rhel7 ~]# service vsftpd start
Redirecting to /bin/systemctl start  vsftpd.service
To make the FTP service startup persistent after system reboot use:
[root@rhel7 ~]# systemctl enable vsftpd
ln -s '/usr/lib/systemd/system/vsftpd.service' '/etc/systemd/system/'

In this quick config we will setup the Berkeley Internet Name Domain (DNS) service named. First, let's briefly describe our environment and proposed scenario. We will be setting up a DNS server to host a single zone file for domain Our DNS server will act as a master authority for this domain and will resolve fully qualified domain (FQDN) and to an IP address

Furthermore, our named daemon will be listening on a two local IP addresses, the loopback IP address and local network interface Lastly, the DNS server will allow queries from any external IP address.

DNS server Installation

Now that we have described our basic scenario let's begin with an DNS server installation. To install DNS server on RHEL7 use yum command below:
# yum install bind
RHEL_7_Disc/productid                         | 1.6 kB     00:00     
  Verifying  : 32:bind-9.9.4-14.el7.x86_64                       1/2 
  Verifying  : 32:bind-libs-9.9.4-14.el7.x86_64                  2/2 

  bind.x86_64 32:9.9.4-14.el7                                        

Dependency Installed:
  bind-libs.x86_64 32:9.9.4-14.el7                                   

Once the DNS installation is finished we will now make a quick configuration to make named daemon listen on our loopback and local network interface address:
[root@rhel7 ~] # ip addr show | grep inet
    inet scope host lo
    inet6 ::1/128 scope host 
    inet brd scope global enp0s3
    inet6 fe80::a00:27ff:fe15:38b7/64 scope link

The php-mbstring is part of Redhat's server optional packages. If you have a current subscirption all you need to do is to enable this repository using:
[root@rhel7 ~]# subscription-manager repos --enable=rhel-7-server-optional-rpms
and use yum to install php-mbstring. In case that you do not have a current Redhat subscription you can install php-mbstring directly from IUS project repository:
[root@rhel7 ~]# wget
[root@rhel7 ~]# wget
[root@rhel7 ~]# rpm -Uvh *release*.rpm

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