在VirtualBox虚拟机里面搭建了数据库，想在虚拟机外面的主机操作系统中通过数据库客户端工具连接到虚拟机里面的数据库。
在"设置"里面配置"网络"选项

在"网络"里面增加一块网卡2，使用"Host-Only"连接方式

在虚拟机里面配置网络
[root@localhost ~]# vim /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
# Please read /usr/share/doc/initscripts-*/sysconfig.txt
# for the documentation of these parameters.
GATEWAY=192.168.56.1
DEVICE=eth1
BOOTPROTO=none
NETMASK=255.255.255.0
TYPE=Ethernet
HWADDR=08:00:27:1d:31:c1
IPADDR=192.168.56.200
IPV6INIT=no
ONBOOT=yes
USERCTL=no

虚拟机eth1网卡的ip地址要和虚拟机外面主机里面虚拟机的网络IP要处于同一网段
C:\Users\jijia>ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection* 9:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : gemalto.com
   IPv4 Address. . . . . . . . . . . : 10.162.104.198
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Default Gateway . . . . . . . . . : 10.162.104.1

Ethernet adapter VirtualBox Host-Only Network:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 192.168.56.1
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :

重启虚拟机网络
[root@localhost ~]# service network restart
[root@localhost ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 08:00:27:27:57:C8  
          inet6 addr: fe80::a00:27ff:fe27:57c8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:258 (258.0 b)

eth1      Link encap:Ethernet  HWaddr 08:00:27:1D:31:C1  
          inet addr:192.168.56.200  Bcast:192.168.56.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe1d:31c1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2403 (2.3 KiB)  TX bytes:1802 (1.7 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:112 errors:0 dropped:0 overruns:0 frame:0
          TX packets:112 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8748 (8.5 KiB)  TX bytes:8748 (8.5 KiB)

这样，虚拟机外面的主机就可以通过网络访问虚拟机里面的网络了
C:\Users\jijia>ping 192.168.56.200

Pinging 192.168.56.200 with 32 bytes of data:
Reply from 192.168.56.200: bytes=32 time=1ms TTL=64
Reply from 192.168.56.200: bytes=32 time<1ms TTL=64
Reply from 192.168.56.200: bytes=32 time<1ms TTL=64
Reply from 192.168.56.200: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.56.200:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 1ms, Average = 0ms