After the centos system is installed, it must be changed in two places.

In fact, after the system is installed, you need to change two places. One is the computer name and the other is the IP address.

Where can I change the computer name?

The configuration file of the centos computer name is network VI/etc/sysconfig/network under the/etc/sysconfig/directory.

Networking = Yes
Hostname = linux123 [change my computer name to linux123]

 

Change computer OS IP Address

Centos network configuration file is/etc/sysconfig/network-scripts directory under the ifcfg-eth0 [if you have multiple NICs, ifcfg-eth 0 ifcfg-eth1, etc]

Edit this configuration file VI/etc/sysconfig/network-scripts/ifcfg-eth0

This is my configuration file

 

Device = eth0
Bootproto = static

Onboot = Yes
Type = Ethernet
Userctl = No
# Gateway = Yes
Dns1 = 8.8.8.8
Dns2 = 114.114.114.114

Ipv6init = No
Hwaddr = 00: 0C: 29: Ea: 7f: DF
Ipaddr = 192.168.1.240
Netmask = 255.255.255.0
Gateway = 192.168.1.1

 

Device = eth0 [Nic alias]
Bootproto = static [You can set it to a static IP address or set it to DHCP for Automatic Retrieval]
Onboot = Yes [start with system]
Type = Ethernet [type Ethernet]
Userctl = No [This is unknown. I only know that this configuration file is available when I compile it]
# Gateway = Yes
Dns1 = 8.8.8.8 [preferred DNS]
Dns2 = 114.114.114.114 [Backup dns]

Ipv6init = No [whether IPv6 is supported]
Hwaddr = 00: 0C: 29: Ea: 7f: DF [physical address]
Ipaddr = 192.168.1.240 [set the IP address of this computer to 192.168.1.240]
Netmask = 255.255.255.0 [mask]
Gateway = 192.168.1.1 [gateway]

 

Save and exit the restart Test

[[Email protected] ~] # Hostname
Linux123

[[Email protected] ~] #

 

[[Email protected] ~] # Ifconfig
Eth0 link encap: Ethernet hwaddr 00: 0C: 29: Ea: 7f: DF
Inet ADDR: 192.168.1.240 bcast: 192.168.1.255 mask: 255.255.255.0
Inet6 ADDR: fe80: 20c: 29ff: feea: 7fdf/64 scope: Link
Up broadcast running Multicast MTU: 1500 Metric: 1
RX packets: 71 errors: 0 dropped: 0 overruns: 0 frame: 0
TX packets: 96 errors: 0 dropped: 0 overruns: 0 carrier: 0
Collisions: 0 FIG: 1000
RX Bytes: 7452 (7.2 kib) TX Bytes: 11422 (11.1 kib)

Lo link encap: local loopback
Inet ADDR: 127.0.0.1 mask: 255.0.0.0
Inet6 ADDR: 1/128 scope: Host
Up loopback running MTU: 16436 Metric: 1
RX packets: 4 errors: 0 dropped: 0 overruns: 0 frame: 0
TX packets: 4 errors: 0 dropped: 0 overruns: 0 carrier: 0
Collisions: 0 txqueuelen: 0
RX Bytes: 240 (240.0 B) TX Bytes: 240 (240.0 B)