Google Compute Metadata 조회 (예: VM의 외부 IP 구하기)

Google Cloud Compute Engine 내에서 외부 IP를 알려면 어떻게 해야 할까?

다음과 같이 한다고 알 수 있는 것은 VM 내부 IP 뿐이다.

[jerryj@jerrydev tmp]$ ifconfig

docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0

        inet6 fe80::42:17ff:febe:3c2f  prefixlen 64  scopeid 0x20<link>

        ether 02:42:17:be:3c:2f  txqueuelen 0  (Ethernet)

        RX packets 2051  bytes 113494 (110.8 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 2033  bytes 15436457 (14.7 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1460

        inet 10.183.0.2  netmask 255.255.255.255  broadcast 10.183.0.2

        inet6 fe80::4001:aff:feb7:2  prefixlen 64  scopeid 0x20<link>

        ether 42:01:0a:b7:00:02  txqueuelen 1000  (Ethernet)

        RX packets 7848752  bytes 46045286889 (42.8 GiB)

        RX errors 0  dropped 0  overruns 0  frame 69

        TX packets 8503481  bytes 2354506702 (2.1 GiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 

다음의 문서를 참고해서 VM의 Metadata를 조회하면 된다. 조회 가능한 항목들 역시 아래 문서에 나와 있다

 

https://cloud.google.com/compute/docs/storing-retrieving-metadata

 

VM 인스턴스 이름을 구하는 Metadata 조회 방법 (아래 헤더가 반드시 포함되어야 함)

[jerryjg@jerrydefault-4cpu-template-1 ~]$ curl -H "Metadata-Flavor: Google" http://metadata.google.internal/computeMetadata/v1/instance/name

 

jerrydefault-4cpu-template-1

 

External IP를 구하는 Metadata 항목 확인 (recursive=true 옵션 사용)

[jerryj@jerrydev tmp]$ curl -H "Metadata-Flavor: Google" http://metadata/computeMetadata/v1/instance/network-interfaces/?recursive=true  | python -m json.tool

 

[

    {

        "accessConfigs": [

            {

                "externalIp": "104.199.xxx.xxx",

                "type": "ONE_TO_ONE_NAT"

            }

        ],

        "dnsServers": [

            "169.254.169.254"

        ],

        "forwardedIps": [],

        "gateway": "10.183.0.1",

        "ip": "10.183.0.2",

        "ipAliases": [],

        "mac": "42:01:0a:b7:00:02",

        "mtu": 1460,

        "network": "projects/249965614499/networks/jerry-default",

        "subnetmask": "255.255.240.0",

        "targetInstanceIps": []

    },

    {

        "accessConfigs": [

            {

                "externalIp": "",

                "type": "ONE_TO_ONE_NAT"

            }

        ],

        "dnsServers": [

            "169.254.169.254"

        ],

        "forwardedIps": [],

        "gateway": "10.10.10.1",

        "ip": "10.10.10.2",

        "ipAliases": [],

        "mac": "42:01:0a:0a:0a:02",

        "mtu": 1460,

        "network": "projects/249965614499/networks/nat-test-jerryjg",

        "subnetmask": "255.255.255.0",

        "targetInstanceIps": []

    }

]

 

[jerryj@jerrydev tmp]$ curl -H "Metadata-Flavor: Google" http://metadata/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip

104.199.xxx.xxx