Virtualbox下安装CentOS

• CentOS 版本：CentOS-7-x86_64-DVD-1804.iso

ifconfig 命令问题

[root@localhost ~]# ifconfig
-bash: ifconfig: command not found

若 CentOS 里边是没有安装 ifconfig

解决办法：yum安装ifconfig这个命令包

# 需要保证虚拟机能连接外网
yum search ifconfig
yum install net-tools.x86_64

通信问题

	NAT	Bridged Adapter	Internal	Host-only Adapter
虚拟机->主机	✔️	✔️	❌	默认不需要设置
主机->虚拟机	❌	✔️	❌	默认不需要设置
虚拟机->其他主机	✔️	✔️	❌	默认不需要设置
其他主机->虚拟机	❌	✔️	❌	默认不需要设置
虚拟机之间	❌	✔️	同网络名下可以	✔️

需要的条件：主机能 ssh 连接虚拟机，虚拟机能连接外网

• 网卡1：桥接网络
• 网卡2：网络地址转换(NAT)

[root@localhost ~]# ifconfig 
enp0s3: flags=4163  mtu 1500
        inet 192.168.2.119  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::8aae:e52f:c521:efb  prefixlen 64  scopeid 0x20
        ether 08:00:27:67:bd:5c  txqueuelen 1000  (Ethernet)
        RX packets 140  bytes 13812 (13.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 100  bytes 11757 (11.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s8: flags=4163  mtu 1500
        inet 10.0.3.15  netmask 255.255.255.0  broadcast 10.0.3.255
        inet6 fe80::8c29:2c4a:8682:b9f5  prefixlen 64  scopeid 0x20
        ether 08:00:27:06:46:d4  txqueuelen 1000  (Ethernet)
        RX packets 4  bytes 814 (814.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 15  bytes 1400 (1.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0