环境：
Centos 7.5
VMware 16.0.0
问题描述：
CentOS7.5 新装系统如何查看网络，配置网卡信息
解决方案：
1.查看ip信息
ip a
ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:50:56:25:19:1c brd ff:ff:ff:ff:ff:ff
inet 192.168.1.227/24 brd 192.168.1.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::36fd:c3d4:ea0a:5ab4/64 scope link noprefixroute
valid_lft forever preferred_lft forever
2.查看编辑网卡信息
vim /etc/sysconfig/network-scripts/ifcfg-ens33（网卡名）
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
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=bf5bb7c5-da27-44a9-b4be-7f6e4138abfd
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.1.227
PREFIX=24
GATEWAY=192.168.1.1
重启网络服务
systemctl restart network
查看ens33网卡信息
ifconfig ens33
ens33: flags=4163 mtu 1500
inet 192.168.1.227 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::36fd:c3d4:ea0a:5ab4 prefixlen 64 scopeid 0x20
ether 00:50:56:25:19:1c txqueuelen 1000 (Ethernet)
RX packets 29155875 bytes 2426699185 (2.2 GiB)
RX errors 0 dropped 108161 overruns 0 frame 0
TX packets 32605674 bytes 12952561612 (12.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
启用ens33网卡
ifconfig ens33 up
禁用ens33网卡
ifconfig ens33 down
查看ens33网卡其他参数
ethtool ens33
Settings for ens33:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: off (auto)
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
DNS设置
vim /etc/resolv.conf
nameserver 192.168.1.1
关闭NetworkManager服务
systemctl stop NetworkManager.service
停止开机自启
systemctl disable NetworkManager.service
查看网络服务
systemctl status network.service
● network.service - LSB: Bring up/down networking
Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
Active: active (running) since 四 2022-03-17 23:58:09 CST; 7h left
Docs: man:systemd-sysv-generator(8)
Process: 975 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/network.service
└─1304 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient-f5774ec4-da78-4594-859b-a17bb015e929-ens33.lease -pf /var/run/dhclient-ens33.pid ens33
3月 17 23:58:06 localhost.localdomain network[975]: 正在打开环回接口： [ 确定 ]
3月 17 23:58:07 localhost.localdomain network[975]: 正在打开接口 ens33：
3月 17 23:58:07 localhost.localdomain dhclient[1193]: DHCPREQUEST on ens33 to 255.255.255.255 port 67 (xid=0x2c76a023)
3月 17 23:58:07 localhost.localdomain dhclient[1193]: DHCPACK from 192.168.1.1 (xid=0x2c76a023)
3月 17 23:58:09 localhost.localdomain NET[1300]: /usr/sbin/dhclient-script : updated /etc/resolv.conf
3月 17 23:58:09 localhost.localdomain dhclient[1193]: bound to 192.168.1.227 -- renewal in 10429 seconds.
3月 17 23:58:09 localhost.localdomain network[975]: 正在确定 ens33 的 IP 信息... 完成。
3月 17 23:58:09 localhost.localdomain NET[1350]: /etc/sysconfig/network-scripts/ifup-post : updated /etc/resolv.conf
3月 17 23:58:09 localhost.localdomain network[975]: [ 确定 ]
3月 17 23:58:09 localhost.localdomain systemd[1]: Started LSB: Bring up/down networking.
查看网络服务日志
cat /var/log/messages | grep network
ar 17 23:53:00 localhost systemd: Started LSB: Bring up/down networking.
Mar 17 23:54:11 localhost systemd: Stopping LSB: Bring up/down networking...
Mar 17 23:54:12 localhost NET[3314]: /etc/sysconfig/network-scripts/ifdown-post : updated /etc/resolv.conf
Mar 17 23:54:12 localhost network: 正在关闭接口 ens33： [ 确定 ]
Mar 17 23:54:12 localhost network: 正在关闭环回接口： [ 确定 ]
Mar 17 23:54:12 localhost systemd: Starting LSB: Bring up/down networking...
Mar 17 23:54:12 localhost NET[3516]: /etc/sysconfig/network-scripts/ifup-post : updated