Create Droplet via API then get public IP address and store as a variable

Question

Hi trying to create a bash script that creates a droplet, then once created gets the IP address of that droplet and store it as a variable to I used that IP address throughout the remaining bash script.

Any pointers on getting the IP and storing as a variable would be very much appreciated.

Bobby Iliev · Accepted Answer

Hello,

You could do something like this:

First get create the new Droplet:

#!/bin/bash

# Here make sure to update your Token and the other Droplet details like the region, your SSH key and etc.

new_droplet=$(curl -X POST -H "Content-Type: application/json" -H "Authorization: Bearer b7d03a6947b217efb6f3ec3bd3504582" -d '{"name":"example.com","region":"nyc3","size":"s-1vcpu-1gb","image":"ubuntu-16-04-x64","ssh_keys":[107149],"backups":false,"ipv6":true,"user_data":null,"private_networking":null,"volumes": null,"tags":["web"]}' "https://api.digitalocean.com/v2/droplets")
...

Update the details accordingly.

The response that you would get would look something like this:

{
  "droplet": {
    "id": 3164494,
    "name": "example.com",
    "memory": 1024,
    "vcpus": 1,
    "disk": 25,
    "locked": true,
    "status": "new",
    "kernel": {
      "id": 2233,
      "name": "Ubuntu 14.04 x64 vmlinuz-3.13.0-37-generic",
      "version": "3.13.0-37-generic"
    },
    "created_at": "2014-11-14T16:36:31Z",
    "features": [
      "virtio"
    ],
    "backup_ids": [

    ],
    "snapshot_ids": [

    ],
    "image": {
    },
    "volume_ids": [

    ],
    "size": {
    },
    "size_slug": "s-1vcpu-1gb",
    "networks": {
    },
    "region": {
    },
    "tags": [
      "web"
    ]
  },
  "links": {
    "actions": [
      {
        "id": 36805096,
        "rel": "create",
        "href": "https://api.digitalocean.com/v2/actions/36805096"
      }
    ]
  }
}

From here we could grab the Droplet ID with the jq command. Make sure that you have jq installed:

sudo apt-get update
sudo apt-get install jq

We could select the Droplet ID only from the output above and store it in a variable:

new_droplet_id=$(echo $new_droplet | jq .droplet.id)

Then we could use the Droplet ID and with another request get the Droplet’s IP address:

new_droplet_details=$(curl -X GET -H "Content-Type: application/json" -H "Authorization: Bearer b7d03a6947b217efb6f3ec3bd3504582" "https://api.digitalocean.com/v2/droplets/${new_droplet_id}")

The output of the curl command would look something like this:

{
  "droplet": {
    "id": 3164494,
    "name": "example.com",
    "memory": 1024,
    "vcpus": 1,
    "disk": 25,
    "locked": false,
    "status": "active",
    "kernel": {
      "id": 2233,
      "name": "Ubuntu 14.04 x64 vmlinuz-3.13.0-37-generic",
      "version": "3.13.0-37-generic"
    },
    "created_at": "2014-11-14T16:36:31Z",
    "features": [
      "ipv6",
      "virtio"
    ],
    "backup_ids": [

    ],
    "snapshot_ids": [
      7938206
    ],
    "image": {
      "id": 6918990,
      "name": "14.04 x64",
      "distribution": "Ubuntu",
      "slug": "ubuntu-16-04-x64",
      "public": true,
      "regions": [
        "nyc1",
        "ams1",
        "sfo1",
        "nyc2",
        "ams2",
        "sgp1",
        "lon1",
        "nyc3",
        "ams3",
        "nyc3"
      ],
      "created_at": "2014-10-17T20:24:33Z",
      "type": "snapshot",
      "min_disk_size": 20,
      "size_gigabytes": 2.34
    },
    "volume_ids": [

    ],
    "size": {
    },
    "size_slug": "s-1vcpu-1gb",
    "networks": {
      "v4": [
        {
          "ip_address": "104.131.186.241",
          "netmask": "255.255.240.0",
          "gateway": "104.131.176.1",
          "type": "public"
        }
      ],
      "v6": [
        {
          "ip_address": "2604:A880:0800:0010:0000:0000:031D:2001",
          "netmask": 64,
          "gateway": "2604:A880:0800:0010:0000:0000:0000:0001",
          "type": "public"
        }
      ]
    },
    "region": {
      "name": "New York 3",
      "slug": "nyc3",
      "sizes": [
        "s-1vcpu-1gb",
        "s-1vcpu-2gb",
        "s-1vcpu-3gb",
        "s-2vcpu-2gb",
        "s-3vcpu-1gb",
        "s-2vcpu-4gb",
        "s-4vcpu-8gb",
        "s-6vcpu-16gb",
        "s-8vcpu-32gb",
        "s-12vcpu-48gb",
        "s-16vcpu-64gb",
        "s-20vcpu-96gb",
        "s-24vcpu-128gb",
        "s-32vcpu-192gb"
      ],
      "features": [
        "virtio",
        "private_networking",
        "backups",
        "ipv6",
        "metadata"
      ],
      "available": true
    },
    "tags": [

    ]
  }
}

Again with the jq command we could select the IPv4 address only:

new_droplet_ip=$(echo $new_droplet_details | jq .droplet.networks.v4[].ip_address)

The whole script would look something like this:

#!/bin/bash

# Here make sure to update your Token and the other Droplet details like the region, your SSH key and etc.
new_droplet=$(curl -X POST -H "Content-Type: application/json" -H "Authorization: Bearer b7d03a6947b217efb6f3ec3bd3504582" -d '{"name":"example.com","region":"nyc3","size":"s-1vcpu-1gb","image":"ubuntu-16-04-x64","ssh_keys":[107149],"backups":false,"ipv6":true,"user_data":null,"private_networking":null,"volumes": null,"tags":["web"]}' "https://api.digitalocean.com/v2/droplets")

new_droplet_id=$(echo $new_droplet | jq .droplet.id)

new_droplet_details=$(curl -X GET -H "Content-Type: application/json" -H "Authorization: Bearer ${api_key}" "https://api.digitalocean.com/v2/droplets/${new_droplet_id}") 

new_droplet_ip=$(echo $new_droplet_details | jq .droplet.networks.v4[].ip_address)

echo "Your new Droplet's IP address is: ${new_droplet_ip}"

The output that you would see at the end would look something like this:

Your new Droplet's IP address is: "159.65.191.52"

Of course, feel free to enchant the script. Hope that this helps! Regards, Bobby

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