Modify the IP address, DNS, and gateway of CentOS

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1. Modify the IP address of CentOS

Modify the configuration file of the corresponding Nic IP Address

# Vi/etc/sysconfig/network-scripts/ifcfg-eth0 modify the following content DEVICE = eth0 # describe the DEVICE alias corresponding to the NIC, for example, in the ifcfg-eth0 file, it is eth0BOOTPROTO = static # Set the way the NIC gets the IP address, the possible option is static, dhcp or bootp, respectively corresponding to the static specified IP address, IP address obtained through dhcp protocol, IP address obtained through bootp protocol BROADCAST = 192.168.0.255 # corresponding subnet BROADCAST address HWADDR = 00: 07: E9: 05: E8: b4 # The physical IP address of the corresponding Nic, IPADDR = 12.168.1.2 # If the IP address obtained by the NIC is set to static, this field specifies the IP address IPV6INIT = no00006_autoconf = noNETMASK = 255.255.255.0 # NETWORK mask NETWORK = 192.168.1.0 # NETWORK address of the NETWORK adapter ONBOOT = yes # whether to set the IP address when the system starts. this network interface, when set to yes, the device is activated when the system starts.

Ii. CentOS gateway Modification

Modify the gateway configuration file of the corresponding Nic
[Root @ centos] # vi/etc/sysconfig/network

Modify the following content
NETWORKING = yes (indicates whether the system uses the network, which is generally set to yes. If it is set to no, the network cannot be used, and many system service programs cannot be started)
HOSTNAME = centos (set the Host Name of the local machine. The host name set here must correspond to the host name set in/etc/hosts)
GATEWAY = 192.168.1.1 (set the IP address of the GATEWAY connected to the local machine. For example, the gateway is 10.0.0.2)

3. Modify DNS in CentOS

Modify the DNS configuration file of the corresponding Nic
# Vi/etc/resolv. conf

Modify the following content

Nameserver 8.8.8.8
# Google Domain Name Server
Nameserver 8.8.4.4 # google Domain Name Server

4. Restart Network Configuration
# Service network restart

Or
#/Etc/init. d/network restart

Modify IP Address

Effective immediately:
# Ifconfig eth0 192.168.0.2 netmask 255.255.255.0

Start effective:
Modify/Etc/sysconfig/network-scripts/ifcfg-eth0

Modify Gateway Default Gateway

Effective immediately:
# Route add default gw 192.168.0.1 dev eth0

Start effective:
Modify/Etc/sysconfig/network

Modify DNS

Modify/Etc/resolv. conf

The modification takes effect immediately and starts as well.

Modify host name

Effective immediately:
# Hostname centos1

Start effective:
Modify/Etc/sysconfig/network