Network adapter configuration file and modify host name in Linux

1.2 NIC configuration file

DEVICE Nic Name (first block eth0, second block eth1 ...). And so on

HWADDR Network card MAC address

UUID Unique identifier, disk identity-------Blkid (view)

Onboot Restart the network card or server after the control card is not self-starting

How to get IP address when Bootproto network card is started (none manually specified IP)

Static statics

Automatic DHCP acquisition

IPADDR IP Address

NETMASK subnet mask to control the maximum number of machines in the LAN

1.2.1 Configuring DNS

/etc/resolv.conf

Used primarily to configure DNS settings

DNS Domain Name Resolution Service

URL, domain name www.baidu.com actual network use IP

Domain name, url--the corresponding IP address

DNS is the domain name and IP parsing tool

Gateway Gateways

Attention:

Nic configuration file takes precedence over etc/resolv.conf

1.2.2 Modifying the configuration DNS of the NIC

Cat>>/etc/sysconfig/network-scripts/ifcfg-eth0<<eof

dns1=223.5.5.5

dns2=223.6.6.6

Eof

1.2.3 Let the modified configuration take effect--restart the NIC

Turn off the network card and then turn on the NIC

Ifdown eth0 && ifup eth0

1.2.4 Restart all network cards

/etc/init.d/network restart

1.2.5 Check Results

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

Device=eth0

Hwaddr=00:0c:29:aa:0b:e9

Type=ethernet

Uuid=f7515424-a426-4e24-852a-8abc4cfc07f8

Onboot=yes

Nm_controlled=yes

Bootproto=none

ipaddr=10.0.0.200

netmask=255.255.255.0

gateway=10.0.0.2

Userctl=no

Peerdns=yes

Ipv6init=no

dns1=223.5.5.5

dns2=223.6.6.6

cat/etc/resolv.conf

NameServer 223.5.5.5

NameServer 223.6.6.6

1.3 Modifying host Names

1.3.1 Temporarily Modify host name-View host name

Hostname

Modify the hostname file under/etc/sysconfig/network Linux

1.3.2 Modifying a host name temporarily---

Hostname OLDBOYEDU-39-NB
Hostname
Oldboyedu-39-niubility

1.3.3 Check if host name changed

Re-Login

Connecting to 10.0.0.200:22
...
Connection established.
To escape to local shell, press ' ctrl+alt+] '.
Last Login:sat Jul 06:58:39 from 10.0.0.1

1.3.4 permanently modifies host name--takes effect after restarting the server

cat/etc/sysconfig/network (view host name)

Networking=yes

Hostname=oldboyedu-39

Sed ' s#oldboyedu-39#oldboyedu-39-nb#g '/etc/sysconfig/network (permanently modified)

Networking=yes

Hostname=oldboyedu-39-nb

Sed-i ' S#oldboyedu-39#oldboyedu-39-nb#g '/etc/sysconfig/network

Cat/etc/sysconfig/network

Networking=yes

Hostname=oldboyedu-39-nb

Modify host name to take effect temporarily: the host name that was temporarily modified after restarting the server is invalidated.

Takes effect after restarting the server permanently

Permission denied denied access

This article is from the "Heyong" blog, make sure to keep this source http://heyong.blog.51cto.com/13121269/1954907

Network adapter configuration file and modify host name in Linux