Suppose my Virtualbox have following output.
$ VBoxManage showvminfo "master-01" --machinereadable
name="master-01"
memory=1024
cpus=2
pae="on"
VMState="running"
hostonlyadapter1="vboxnet1"
macaddress1="0800275BAF21"
cableconnected1="on"
nic1="hostonly"
nictype1="82545EM"
nicspeed1="0"
natnet2="nat"
macaddress2="0800274A2EA2"
cableconnected2="on"
nic2="nat"
nictype2="82545EM"
nicspeed2="0"
nic3="none"
nic4="none"
nic5="none"
nic6="none"
nic7="none"
nic8="none"
GuestMemoryBalloon=0
GuestOSType="Linux26_64"
GuestAdditionsRunLevel=2
GuestAdditionsVersion="6.0.14 r133895"
GuestAdditionsFacility_VirtualBox Base Driver=50,1571759712632
GuestAdditionsFacility_VirtualBox System Service=50,1571759720710
GuestAdditionsFacility_Seamless Mode=0,1571759712629
GuestAdditionsFacility_Graphics Mode=0,1571759712629
... more properties are cut off
$ VBoxManage guestproperty enumerate master-01 --patterns "/VirtualBox/GuestInfo/Net*"
Name: /VirtualBox/GuestInfo/Net/0/MAC, value: 0800274A2EA2, timestamp: 1571759720723377000, flags:
Name: /VirtualBox/GuestInfo/Net/0/V4/IP, value: 10.0.3.15, timestamp: 1571759720723226000, flags:
Name: /VirtualBox/GuestInfo/Net/0/V4/Netmask, value: 255.255.255.0, timestamp: 1571759720723342000, flags:
Name: /VirtualBox/GuestInfo/Net/0/Status, value: Up, timestamp: 1571759720723419000, flags:
Name: /VirtualBox/GuestInfo/Net/0/Name, value: eth0, timestamp: 1571759720723448000, flags:
Name: /VirtualBox/GuestInfo/Net/0/V4/Broadcast, value: 10.0.3.255, timestamp: 1571759720723308000, flags:
Name: /VirtualBox/GuestInfo/Net/1/Name, value: docker0, timestamp: 1571759720723876000, flags:
Name: /VirtualBox/GuestInfo/Net/1/MAC, value: 0242BF5B1B9D, timestamp: 1571759720723772000, flags:
Name: /VirtualBox/GuestInfo/Net/1/V4/IP, value: 172.17.0.1, timestamp: 1571759720723477000, flags:
Name: /VirtualBox/GuestInfo/Net/1/V4/Netmask, value: 255.255.0.0, timestamp: 1571759720723594000, flags:
Name: /VirtualBox/GuestInfo/Net/1/Status, value: Up, timestamp: 1571759720723842000, flags:
Name: /VirtualBox/GuestInfo/Net/1/V4/Broadcast, value: 172.17.255.255, timestamp: 1571759720723514000, flags:
Name: /VirtualBox/GuestInfo/Net/2/Status, value: Up, timestamp: 1571759720724350000, flags:
Name: /VirtualBox/GuestInfo/Net/2/Name, value: eth1, timestamp: 1571759720724414000, flags:
Name: /VirtualBox/GuestInfo/Net/2/MAC, value: 0800275BAF21, timestamp: 1571759720724187000, flags:
Name: /VirtualBox/GuestInfo/Net/2/V4/IP, value: 192.168.99.112, timestamp: 1571759720723908000, flags:
Name: /VirtualBox/GuestInfo/Net/2/V4/Netmask, value: 255.255.255.0, timestamp: 1571759720724096000, flags:
Name: /VirtualBox/GuestInfo/Net/2/V4/Broadcast, value: 192.168.99.255, timestamp: 1571759720723946000, flags:
Name: /VirtualBox/GuestInfo/Net/Count, value: 3, timestamp: 1571760671544746000, flags:
we only iterate over the number of physical interfaces, which possibly cannot find the interface IP address in the 3rd place.
Also, it results in returning early and resource network_adapter
cannot be set.