Setting up network using NetworkManager and network scripts in Redhat 7
Red Hat Enterprise Linux 7: Setting up network using NetworkManager and network scripts.
This video tutorial is part of RHCSA Fast Track course.
Here is step by step cookbook to set-up RHEL 7 network using NetworkManager and network scripts:
1) Verify that NetworkManager is running and enabled to start after reboot
systemctl status NetworkManager
systemctl is-enabled NetworkManager
2) Update /etc/hosts file with IP address, hostname and FQDN of your server
vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.99.202 lxserv02 lxserv02.domain99.private.com
3) Configure network scripts - network adapter config file
vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NM_CONTROLLED=yes
BOOTPROTO=static
ONBOOT=yes
IPADDR=172.16.99.202
NETMASK=255.255.255.0
NETWORK=172.16.99.0
BROADCAST=172.16.99.255
GATEWAY=172.16.99.1
DNS1=8.8.8.8
DNS2=208.67.220.220
4) Restart network service
systemctl restart network
5) Verify resolv.conf configuration file if it contains DNS servers configured in previous step. NetworkManager should update /etc/resolv.conf file automatically
cat /etc/resolv.conf
6) Verify networking
ip a (ip addr) (ip address)
ip r (ip route)
yum install net-tools
ifconfig -a
ifconfig eth0
netstat -r
netstat -rn
yum install bind-utils
nslookup redhat.com
dig redhat.com
dig @208.67.220.220 redhat.com
ping redhat.com
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