centos 7.4 添加新网卡详解程序员

vm: VirtualBox 图形用户界面 版本 5.2.4 r119785 (Qt5.6.2)
os: centos 7.4 x86_64

# yum install redhat-lsb*

# lsb_release -a 
LSB Version:    :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch 
Distributor ID: CentOS 
Description:    CentOS Linux release 7.4.1708 (Core)  
Release:    7.4.1708 
Codename:   Core 
 
 
# uname -a 
Linux oradb 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

vm界面添加一个新网卡，进入系统查看

# ip a 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 
    inet 127.0.0.1/8 scope host lo 
       valid_lft forever preferred_lft forever 
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 
    link/ether 08:00:27:e0:67:fc brd ff:ff:ff:ff:ff:ff 
    inet 192.168.56.100/24 brd 192.168.56.255 scope global enp0s3 
       valid_lft forever preferred_lft forever 
3: enp0s8: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 
    link/ether 08:00:27:82:88:46 brd ff:ff:ff:ff:ff:ff 
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000 
    link/ether 52:54:00:f7:de:fa brd ff:ff:ff:ff:ff:ff 
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 
       valid_lft forever preferred_lft forever 
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000 
    link/ether 52:54:00:f7:de:fa brd ff:ff:ff:ff:ff:ff

其中 3: enp0s8 为新加的网卡

# ifup enp0s8 
/usr/sbin/ifup: configuration for enp0s8 not found. 
Usage: ifup <configuration> 
 
# systemctl status NetworkManager 
● NetworkManager.service - Network Manager 
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; disabled; vendor preset: enabled) 
   Active: inactive (dead) 
     Docs: man:NetworkManager(8) 
[[email protected] ~]#  
[[email protected] ~]# systemctl status network 
● network.service - LSB: Bring up/down networking 
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled) 
   Active: active (exited) since Mon 2018-01-29 11:08:46 CST; 9min ago 
     Docs: man:systemd-sysv-generator(8) 
 
Jan 29 11:08:39 oradb systemd[1]: Starting LSB: Bring up/down networking... 
Jan 29 11:08:42 oradb network[834]: Bringing up loopback interface:  [  OK  ] 
Jan 29 11:08:46 oradb network[834]: Bringing up interface enp0s3:  [  OK  ] 
Jan 29 11:08:46 oradb systemd[1]: Started LSB: Bring up/down networking. 
 
 
# cd /etc/sysconfig/network-scripts/ 
[[email protected] network-scripts]# ls -l|more 
total 244 
-rw-r--r--  1 root root   417 Dec  1 09:34 ifcfg-enp0s3

手动创建 网卡配置文件

# cp ./ifcfg-enp0s3 ./ifcfg-enp0s8 
 
# vi ifcfg-enp0s8  
TYPE="Ethernet" 
PROXY_METHOD="none" 
BROWSER_ONLY="no" 
BOOTPROTO="dhcp" 
DEFROUTE="yes" 
IPV4_FAILURE_FATAL="no" 
IPV6INIT="no" 
IPV6_AUTOCONF="yes" 
IPV6_DEFROUTE="yes" 
IPV6_FAILURE_FATAL="no" 
IPV6_ADDR_GEN_MODE="stable-privacy" 
NAME="enp0s8" 
HWADDR="08:00:27:82:88:46" 
DEVICE="enp0s8" 
ONBOOT="yes" 
IPV6_PRIVACY="no" 
 
# ifup enp0s8 
 
Determining IP information for enp0s8... done.