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    Querying Instance Metadata

    Last updated: 2024-01-08 09:32:02
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      Instance metadata refers to data relevant to an instance. It can be used for configuring or managing a running instance.
      Note:
      Although instance metadata can only be accessed after login, the data has not been encrypted. Anyone who accesses the instance can view its metadata. Therefore, you should take proper actions to protect sensitive data.

      Overview

      Tencent Cloud provides the following metadata:
      Name
      Description
      Version
      instance-id
      Instance ID
      1.0
      instance-name
      Instance name
      1.0
      uuid
      Instance ID
      1.0
      local-ipv4
      Instance private IP address
      1.0
      public-ipv4
      Instance public IP address
      1.0
      mac
      MAC address of the instance's eth0 device
      1.0
      placement/region
      Instance region
      Updated on September 19, 2017
      placement/zone
      Instance availability zone
      Updated on September 19, 2017
      network/interfaces/macs/${mac}/mac
      MAC address of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/primary-local-ipv4
      Primary private IP of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/public-ipv4s
      Public IP address of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/vpc-id
      VPC ID of the instance’s network interface
      Updated on September 19, 2017
      network/interfaces/macs/${mac}/subnet-id
      Subnet ID of the instance’s network interface
      Updated on September 19, 2017
      network/interfaces/macs/${mac}/local-ipv4s/${local-ipv4}/gateway
      Gateway address of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/local-ipv4s/${local-ipv4}/local-ipv4
      Private IP address of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/local-ipv4s/${local-ipv4}/public-ipv4
      Public IP address of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/local-ipv4s/${local-ipv4}/public-ipv4-mode
      Public network mode of the instance’s network interface
      1.0
      network/interfaces/macs/${mac}/local-ipv4s/${local-ipv4}/subnet-mask
      Subnet mask of the instance’s network interface
      1.0
      payment/charge-type
      Instance billing plan
      Updated on September 19, 2017
      payment/create-time
      Instance creation time
      Updated on September 19, 2017
      payment/termination-time
      Instance termination time
      Updated on September 19, 2017
      app-id
      AppID of the user to which the instance belongs
      Updated on September 19, 2017
      as-group-id
      Auto scaling group ID of the instance
      Updated on September 19, 2017
      spot/termination-time
      Spot instance termination time
      Updated on September 19, 2017
      instance/instance-type
      Instance type
      Updated on September 19, 2017
      instance/image-id
      Instance image ID
      Updated on September 19, 2017
      instance/security-group
      Information of the security group bound to the instance
      Updated on September 19, 2017
      instance/bandwidth-limit-egress
      Instance private network outbound bandwidth limit, in Kbit/s
      Updated on 9/29/2019
      instance/bandwidth-limit-ingress
      Instance private network inbound bandwidth limit, in Kbit/s
      Updated on 9/29/2019
      cam/security-credentials/${role-name}
      Temporary credential generated by the CAM role policy, which can be obtained only when the instance is associated with the CAM role. Change `${role-name}` to the actual CAM role name; otherwise, `404` will be returned
      Updated on 12/11/2019
      volumes
      Instance storage
      1.0
      Note:
      Field ${mac} and ${local-ipv4} in the above table indicate the MAC address and private IP address of the network interface specified for the instance, respectively.
      The destination URL address of the request is case-sensitive. You must construct the destination URL address of a new request according to the returned result of the request.
      In the current version, the returned data of placement has been changed. To use the data in the previous version, specify the previous version path or leave the version path empty to access the data of version 1.0. For more information on the returned data of placement, see Region and Availability Zone.

      Querying Instance Metadata

      After logging in to an instance, you can access the metadata such as its local IP address and public IP address to manage connections with external applications. To view all the instance metadata within a running instance, use the following URI:
      http://metadata.tencentyun.com/latest/meta-data/
      You can access the metadata by using the cURL tool or an HTTP GET request, for example:
      curl http://metadata.tencentyun.com/latest/meta-data/
      For resources that do not exist, the HTTP error code "404 - Not Found" will be returned.
      All metadata-related operations can only be taken place after you logging in to the instance. For more information, see Logging In To Windows Instance and Logging In To Linux Instance.

      Sample metadata query

      The following example shows how to obtain the metadata version.
      Note:
      When Tencent Cloud modifies the metadata access path or returned data, a new metadata version is released. If your application or script depends on the structure or returned data of the previous version, you can access metadata using the specified previous version. If no version is specified, version 1.0 is accessed by default.
      [qcloud-user]# curl http://metadata.tencentyun.com/
      1.0
      9/19/2017
      latest
      meta-data
      The following example shows how to view the metadata root directory. The lines ending with / represent directories and other lines represent the accessed data. For the description of accessed data, see the Overview section described above.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/
      instance-id
      instance-name
      local-ipv4
      mac
      network/
      placement/
      public-ipv4
      uuid
      The following example shows how to obtain the physical location information of an instance. For the relationship between the returned data and the physical location, see Regions and Availability Zones.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/placement/region
      ap-guangzhou
      
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/placement/zone
      ap-guangzhou-3
      The following example shows how to obtain the private IP address of an instance. If an instance has multiple ENIs, the network address of the eth0 device is returned.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/local-ipv4
      10.104.13.59
      The following example shows how to obtain the public IP address of an instance.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/public-ipv4
      139.199.11.29
      The following example shows how to obtain an instance ID. The instance ID is used to uniquely identify an instance.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/instance-id
      ins-3g445roi
      The following example shows how to query the instance UUID. The instance UUID can also be used as the unique identifier of an instance, but we recommend that you use instance ID to identify instances.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/uuid
      cfac763a-7094-446b-a8a9-b995e638471a
      The following example shows how to obtain the MAC address of an instance's eth0 device.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/mac
      52:54:00:BF:B3:51
      The following example shows how to obtain the ENI information of an instance. In case of multiple ENIs, multiple lines of data are returned, with each line indicating the data directory of an ENI.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/
      52:54:00:BF:B3:51/
      The following example shows how to obtain the information of a specified ENI.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/
      local-ipv4s/
      mac
      vpc-id
      subnet-id
      owner-id
      primary-local-ipv4
      public-ipv4s
      local-ipv4s/
      The following example shows how to obtain the VPC information of a specified ENI.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/vpc-id
      vpc-ja82n9op
      
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/subnet-id
      subnet-ja82n9op
      The following example shows how to obtain the list of private IP addresses bound to the specified ENI. If the ENI is bound with multiple private IP addresses, multiple lines of data are returned.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/
      10.104.13.59/
      The following example shows how to obtain the information of a private IP address.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/10.104.13.59
      gateway
      local-ipv4
      public-ipv4
      public-ipv4-mode
      subnet-mask
      The following example shows how to obtain the gateway of a private IP address. This data can be queried only for VPC-based CVMs. For more information about VPC-based CVMs, please see Virtual Private Cloud (VPC).
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/10.104.13.59/gateway
      10.15.1.1
      The following example shows how to obtain the access mode used by a private IP address to access the public network. This data can be queried only for VPC-based CVMs. A classic network-based CVM accesses the public network through the public gateway.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/10.104.13.59/public-ipv4-mode
      NAT
      The following example shows how to obtain the public IP address bound to a private IP address.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/10.104.13.59/public-ipv4
      139.199.11.29
      The following example shows how to obtain the subnet mask of a private IP address.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/network/interfaces/macs/52:54:00:BF:B3:51/local-ipv4s/10.104.13.59/subnet-mask
      255.255.192.0
      The following example shows how to obtain the billing type of an instance.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/payment/charge-type
      POSTPAID_BY_HOUR
      The following example shows how to obtain the creation time of an instance.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/payment/create-time
      2018-09-18 11:27:33
      The following example shows how to obtain the termination time for spot instances.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/spot/termination-time
      2018-08-18 12:05:33
      The following example shows how to obtain the account AppId to which the CVM belongs.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/app-id
      123456789
      The following example shows how to obtain the temporary credential generated by the CAM role to which the instance belongs. In this example, the role name is CVMas.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/cam/security-credentials/CVMas
      {
        TmpSecretId": "AKIDoQMxA6cW447p225cIt9NW8dhA1dwl5UvxxxxxxxxxUqRlEb5_",
        "TmpSecretKey": "Q9z24VucjF4xQQN1PEsH3exxxxxxxxxgA=",
        "ExpiredTime": 1615590047,
        "Expiration": "2021-03-12T23:00:47Z",
        "Token": "xxxxxxxxxxx",
        "Code": "Success"
      }
      The following example shows how to query the instance storage. 
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/meta-data/volumes
      disk-xxxxxxxx/

      Querying Instance User Data

      You can specify instance user data when creating an instance. CVM instances having cloud-init configured can access the data.

      Searching user data

      After login, you can access user data by using the following method.
      [qcloud-user]# curl http://metadata.tencentyun.com/latest/user-data
      179, client, shanghai
      
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