virtualbox下centos实现主宿互访

1.网络连接方式

NAT
桥接
Host-Only

NAT: 网络地址转换，virtualbox默认采用这种连接方式，特点：

1.虚拟机配置稍作修改就能连上外网

2.虚拟机可以ping通主机，主机不能ping通虚拟机

桥接：虚拟机就像一台真实的机器，有独立ip，特点：

1.静态ip

2.主机和虚拟机能互相ping通

3.网卡只能选无线或者有线

Host-Only:

虚拟机在主机上建立一个网卡，虚拟机通过这个网卡和主机进行相互通信

2.网卡配置

我们使用命令查看当前网卡状态：

[pigfly@localhost src]$ ip addr show

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

    inet6 ::1/128 scope host

       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:ff:1a:18 brd ff:ff:ff:ff:ff:ff

    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3

       valid_lft 76520sec preferred_lft 76520sec

    inet6 fe80::11d1:6afa:b77a:8bdd/64 scope link

       valid_lft forever preferred_lft forever

可以看到有两个网卡，enp0s3就是虚拟机默认采用NAT连接的网卡，编辑网卡文件随系统自动启动此网卡：

[pigfly@localhost src]$ vi /etc/sysconfig/network-scripts/ifcfg-enp0s3

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=enp0s3

UUID=02e3fd29-ae05-4131-9f9d-7ed71057531a

DEVICE=enp0s3

ONBOOT=yes

[pigfly@localhost ~]$ service network restart

[pigfly@localhost ~]$ ping 192.168.0.104 #虚拟机ping主机，通

C:\Users\think>ping 10.0.2.15 #主机ping虚拟机，不通

[pigfly@localhost ~]$ ping baidu.com #ping外网，通

如果我们想要虚拟机和主机能互相ping通，就需要再加一个桥接的网卡了，打开虚拟机设置->网络，连接方式选择主机的无线网卡：

启动虚拟机，查看网卡状态：

[root@localhost network-scripts]# ip addr show

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

inet6 ::1/128 scope host

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:ff:1a:18 brd ff:ff:ff:ff:ff:ff

inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3

valid_lft 85958sec preferred_lft 85958sec

inet6 fe80::11d1:6afa:b77a:8bdd/64 scope link

valid_lft forever preferred_lft forever

3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 08:00:27:71:49:ad brd ff:ff:ff:ff:ff:ff

inet 192.168.0.102/24 brd 192.168.0.255 scope global enp0s8

valid_lft forever preferred_lft forever

inet6 fe80::65d9:3a1f:6ec8:16fd/64 scope link

valid_lft forever preferred_lft forever

可以发现多了个enp0s8的配置，这就是我们刚才在虚拟机里面添加的桥接模式的网卡，添加网卡配置：

[root@localhost ~]# cd /etc/sysconfig/network-scripts

[root@localhost network-scripts]# cp ifcfg-enp0s3 ifcfg-enp0s8

[root@localhost network-scripts]# vi ifcfg-enp0s8

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=static

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=enp0s8

UUID=02e3fd29-ae05-4131-9f9d-7ed71057531a #删掉uuid

DEVICE=enp0s8

IPADDR=192.168.0.102 #ip配置和本机ip在同一个网段

ONBOOT=yes



[root@localhost network-scripts]# service network restart

[pigfly@localhost ~]$ ping -c 2 192.168.0.104

PING 192.168.0.104 (192.168.0.104) 56(84) bytes of data.

64 bytes from 192.168.0.104: icmp_seq=1 ttl=128 time=0.221 ms

64 bytes from 192.168.0.104: icmp_seq=2 ttl=128 time=0.448 ms

--- 192.168.0.104 ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 999ms

rtt min/avg/max/mdev = 0.221/0.334/0.448/0.114 ms

[pigfly@localhost ~]$ ping -c 2 baidu.com

PING baidu.com (123.125.114.144) 56(84) bytes of data.

64 bytes from 123.125.114.144 (123.125.114.144): icmp_seq=1 ttl=50 time=42.3 ms

64 bytes from 123.125.114.144 (123.125.114.144): icmp_seq=2 ttl=50 time=43.1 ms

--- baidu.com ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1001ms

rtt min/avg/max/mdev = 42.324/42.752/43.180/0.428 ms

主机ping虚拟机：

到此主机和虚拟机互相能ping通，虚拟机也可以ping通外网，这样就OK了吗？

由于我的wifi老是掉线，只要wifi一掉线，虚拟机和主机就互相都ping不通了，这个不太好啊，于是又把桥接改成Host-Only：

我们打开主机的网络连接看看这块Host-Only网卡的配置：

得知网卡ip地址是192.168.56.1，如此一来虚拟机的网卡配置也因做相应更改：

[root@localhost ~]# cd /etc/sysconfig/network-scripts/

[root@localhost network-scripts]# vi ifcfg-enp0s8

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

BOOTPROTO=static

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=enp0s8

UUID=efa33ed9-ee5e-492d-98f8-64b4701aba30

DEVICE=enp0s8

IPADDR=192.168.56.100 #和虚拟网卡在同一个网段

ONBOOT=yes

[root@localhost network-scripts]# service network restart