Changing IP, Password and Configure Eth0 in Linux for Azure

vi /etc/sysconfig/network-scripts/ifcfg-eth0

ifconfig eth0 100.108.28.30 netmask 255.255.254.0 up

route add default gw 100.108.70.1

or

ifconfig eth0 up

ifconfig eth0 192.168.99.14 netmask 255.255.255.0 up

route add -net 192.168.129.23 netmask 255.255.255.255 gw 192.168.129.2

route add default gw 192.168.99.254

route -n

:wq
$ sudo -s
# passwd root

## Configure eth0
#
# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0"
NM_CONTROLLED="yes"
ONBOOT=yes
HWADDR=A4:BA:DB:37:F1:04
TYPE=Ethernet
BOOTPROTO=static
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
IPADDR=192.168.1.44
NETMASK=255.255.255.0
## Configure Default Gateway
#
# vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=centos6
GATEWAY=192.168.1.1
## Restart Network Interface
#

/etc/init.d/network restart

## Configure DNS Server
#
# vi /etc/resolv.conf

nameserver 8.8.8.8 # Replace with your nameserver ip
nameserver 192.168.1.1 # Replace with your nameserver ip