新安装好的centos8默认网卡是没有启动的，安装好后需要先配置网络。在/etc/sysconfig/network-scripts目录下存放着网卡的配置文件，文件名称是ifcfg- 网卡名称。
修改配置文件
使用DHCP获取IP地址
- 首先使用
cd /etc/sysconfig/network-scripts命令进入网卡配置文件所在的文件夹中。 - 接着使用
vi ifcfg-网卡名称命令，若使用DHCP服务获取IP，则将ONBOOT=no修改为ONBOOT=yes即可。
# 网卡配置文件按默认配置
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=e9f74441-a79f-4524-bf99-f2596e5f7a5f
DEVICE=ens33
ONBOOT=yes #如果使用dhcp分配ip的话，只需要将这里no改为yes，然后重启网络服务就行配置静态IP
# 网卡配置文件按默认配置
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static #将dhcp修改为stati表示使用静态ip
DEFROUTE=yes
IPADDR=192.168.132.132 #设置IP地址
NETMASK=255.255.255.0 #设置子网掩码
GATEWAY=192.168.132.254 #设置网关
DNS1=114.114.114.114 #设置dns
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=e9f74441-a79f-4524-bf99-f2596e5f7a5f
DEVICE=ens33
ONBOOT=yes #将no改为yes重启网络服务
使用nmcli c reload命令重启网络服务。
使用ping命令测试修改是否成功
使用ping -c 4 www.baidu.com命令测试，测试结果如下方所示。
[root@localhost network-scripts]# ping -c 4 www.baidu.com
PING www.a.shifen.com (220.181.38.150) 56(84) bytes of data.
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=1 ttl=128 time=140 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=2 ttl=128 time=58.8 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=3 ttl=128 time=47.3 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=4 ttl=128 time=31.10 ms
--- www.a.shifen.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 9ms
rtt min/avg/max/mdev = 31.970/69.487/139.889/41.743 ms关于nmcli的补充
nmcli命令的参数
[root@localhost network-scripts]# nmcli -h
Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }
OPTIONS
-a, --ask ask for missing parameters
-c, --colors auto|yes|no whether to use colors in output
-e, --escape yes|no escape columns separators in values
-f, --fields <field,...>|all|common specify fields to output
-g, --get-values <field,...>|all|common shortcut for -m tabular -t -f
-h, --help print this help
-m, --mode tabular|multiline output mode
-o, --overview overview mode
-p, --pretty pretty output
-s, --show-secrets allow displaying passwords
-t, --terse terse output
-v, --version show program version
-w, --wait <seconds> set timeout waiting for finishing operations
OBJECT
g[eneral] NetworkManager's general status and operations
n[etworking] overall networking control
r[adio] NetworkManager radio switches
c[onnection] NetworkManager's connections
d[evice] devices managed by NetworkManager
a[gent] NetworkManager secret agent or polkit agent
m[onitor] monitor NetworkManager changesnmclli c的用法
[root@localhost network-scripts]# nmcli c -h
Usage: nmcli connection { COMMAND | help }
COMMAND := { show | up | down | add | modify | clone | edit | delete | monitor | reload | load | import | export }
show [--active] [--order <order spec>]
show [--active] [id | uuid | path | apath] <ID> ...
up [[id | uuid | path] <ID>] [ifname <ifname>] [ap <BSSID>] [passwd-file <file with passwords>]
down [id | uuid | path | apath] <ID> ...
add COMMON_OPTIONS TYPE_SPECIFIC_OPTIONS SLAVE_OPTIONS IP_OPTIONS [-- ([+|-]<setting>.<property> <value>)+]
modify [--temporary] [id | uuid | path] <ID> ([+|-]<setting>.<property> <value>)+
clone [--temporary] [id | uuid | path ] <ID> <new name>
edit [id | uuid | path] <ID>
edit [type <new_con_type>] [con-name <new_con_name>]
delete [id | uuid | path] <ID>
monitor [id | uuid | path] <ID> ...
reload
load <filename> [ <filename>... ]
import [--temporary] type <type> file <file to import>
export [id | uuid | path] <ID> [<output file>]
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