Red Hat Based Systems Network Manager Text UI

Red Hat Based Systems Network Manager Text UI will show you step by step how to set your Public VPS Network Configuration using menu driven tool called Text User Interface. However, I still recommend using nano editor since it will give you more control over the settings. Besides, I have included how to change your CentOS Machine IP settings using command line Interface. Bottom line you got 3 different ways to edit or change Network Settings: nano editor, Cli, and TUI.

Objectives:

1. Configuring CentOS6 Network Settings

2. Configuring CentOS7 Network Settings

Prerequisites:

A. Basic Domain, Sub-domain, or DNS Knowledge

B. Login to your DigitalOcean or Vultr Account

Configuring CentOS6 Network Settings 

On CentOS6, I can use system-config-network to set static IP addresses, DNS Settings, and Hostname.

Public VPS users: I recommend using nano editor to edit or configure your Network settings as shown in Red Hat Based Hostname Plus Network Configuration, however, if you still not ready for nano editor yet, you can use the TUI as shown below.

Run the following steps (1 to 3)

1. Install Network Configuration Tools

yum install system-config-network-tui net-tools

2. Run System Network Configuration

system-config-network

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3. Restart Network Services

Note: the following command might disconnect you from Putty window. You need to reopen a new Putty Window session using the New IP address.

service network restart

(Optional) Add Extra IP addresses

Create the Interface file

nano /etc/sysconfig/network-scripts/ifcfg-eth0:0

Note: mark the colon and Zero at the end, it commands the network manager to create a Virtual Interface which would be part of the physical interface.

Copy and Paste the following inside the ifcfg-eth0:0 file, of course replace the IP address using your IP address.

# eth0:0 configuration 
DEVICE=eth0:0
BOOTPROTO=none

# Bring the Interface on Boot
ONBOOT=yes

# eth0:0 IP Settings
IPADDR=192.168.1.27
NETMASK=255.255.255.0

Save: Ctrl-X, Hit Y Key, and Enter.

Add another IP Address

nano /etc/sysconfig/network-scripts/ifcfg-eth0:1

# eth0:1 configuration
DEVICE=eth0:1
BOOTPROTO=none

# Bring the Interface on Boot
ONBOOT=yes

# eth0:1 IP Settings
IPADDR=192.168.1.28
NETMASK=255.255.255.0

Save: Ctrl-X, Hit Y Key, and Enter.

Restart Network Services

service network restart

Configuring CentOS7 Network Settings

On CentOS7, I can use nmtui command to set static IP addresses, DNS Settings, and Hostname.

Public VPS users: I recommend using nano editor to edit or configure your Network settings as shown in Red Hat Based Hostname Plus Network Configuration, however, if you still not ready for nano editor yet, you can use the TUI as shown below.

Run the following steps (1 to 5)

1. Install Network Configuration Tools

yum install NetworkManager-tui net-tools -y

2. Unmask and start the Service

systemctl unmask NetworkManager
systemctl start NetworkManager

3. Turn On the Service at Startup

systemctl enable NetworkManager.service

4. Run System Network Configuration

nmtui

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5. Restart Network Services

Note: the following command might disconnect you from Putty window. You need to reopen a new Putty Window session using the New IP address.

systemctl restart network

Using Network Manager Cli to Set Static IP Address

First, List Active Interfaces

nmcli dev status

Note: Based on your Infrastructure, each interface in here might be called different name. I’ve realized that when using VirtualBox or VMware Station, CentOS7 names its interface different than usual, but, that’s not the case when using a Public VPS.

For Example: Under VirtualBox

DEVICE TYPE STATE CONNECTION
enp0s3 ethernet connected enp0s3
lo loopback unmanaged --
[email protected]:~#

Under VMware Station:

DEVICE       TYPE      STATE      CONNECTION
eno16777736  ethernet  connected  eno16777736
lo           loopback  unmanaged  --
[email protected]:~#

Setting Static IP Address on VirtualBox: VM Interface name: enp0s3

Run the following steps (1 to 7)

Of course, you need to replace the IP using your IP address.

1. Set Static IPv4 Address with Prefix /24

nmcli con modify enp0s3 ipv4.addresses 192.168.1.26/24

2. Set Default Gateway

nmcli con modify enp0s3 ipv4.gateway 192.168.1.1

3. Set DNS Settings

nmcli con modify enp0s3 ipv4.dns "192.168.1.1 8.8.8.8"

Add another DNS Server using Plus Sign

nmcli con modify enp0s3 +ipv4.dns 8.8.4.4

Remove one of the DNS Servers using Mines Sign

nmcli con modify enp0s3 -ipv4.dns 8.8.8.8

4. Set manual for static “auto” for DHCP

nmcli con modify enp0s3 ipv4.method manual

5. Restart the interface to Reload new settings

Note: the following command might disconnect you from Putty window. You need to reopen a new Putty Window session using the New IP address.

systemctl restart network

6. Show Interface Settings

nmcli dev show enp0s3

GENERAL.DEVICE:                         enp0s3
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         08:00:27:F8:08:63
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     enp0s3
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.26/24
IP4.GATEWAY:                            192.168.1.1
IP4.DNS[1]:                             192.168.1.1
IP4.DNS[2]:                             8.8.4.4
IP6.ADDRESS[1]:                         fe80::a00:27ff:fef8:863/64
IP6.GATEWAY:

7. Show Interface Status

ip addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:f8:08:63 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.26/24 brd 192.168.1.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fef8:863/64 scope link tentative dadfailed
       valid_lft forever preferred_lft forever

Setting Static IP Address on VM Ware Station: VM Interface name: eno16777736

Run the following steps (1 to 7)

1. Set Static IPv4 Address with Prefix /24

nmcli con modify eno16777736 ipv4.addresses 192.168.1.26/24

2. Set Default Gateway

nmcli con modify eno16777736 ipv4.gateway 192.168.1.1

3. Set DNS Settings

nmcli con modify eno16777736 ipv4.dns "192.168.1.1 8.8.8.8"

Add another DNS Server using Plus Sign

nmcli con modify eno16777736 +ipv4.dns 8.8.4.4

Remove one of the DNS Servers using Mines Sign

nmcli con modify eno16777736 -ipv4.dns 8.8.8.8

4. Set manual for static “auto” for DHCP

nmcli con modify eno16777736 ipv4.method manual

5. Restart the interface to Reload new settings

Note: the following command might disconnect you from Putty window. You need to reopen a new Putty Window session using the New IP address.

systemctl restart network

6. Show Interface Settings

nmcli dev show eno16777736

GENERAL.DEVICE:                         eno16777736
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:0C:29:EA:42:B4
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     eno16777736
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.26/24
IP4.GATEWAY:                            192.168.1.1
IP4.DNS[1]:                             192.168.1.1
IP4.DNS[2]:                             8.8.4.4
IP6.ADDRESS[1]:                         fe80::20c:29ff:feea:42b4/64
IP6.GATEWAY:

7. Show Interface Status

ip addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ea:42:b4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.26/24 brd 192.168.1.255 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:feea:42b4/64 scope link tentative dadfailed
       valid_lft forever preferred_lft forever

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