How to Secure Caching Managed Database Clusters

Validated on 21 Jul 2021 • Last edited on 27 Aug 2024 luks | tag | connection status

Redis is an open source, key-value database built with an in-memory design that emphasizes speed. It has support for rich data types, atomic operations, and Lua scripting.

Data in Caching database clusters is encrypted at rest with LUKS (Linux Unified Key Setup) and in transit with SSL. However, there are additional steps you can take to ensure that your data is safe.

Restrict Incoming Connections

You can greatly decrease the likelihood of a security breach by restricting which DigitalOcean resources or external IP addresses are allowed to access the nodes in a cluster. This prevents brute force password and denial-of-service attacks from any server not explicitly permitted to connect.

Typically, only the application servers are allowed to connect to the database cluster. Users access the public-facing site, and the public-facing server authenticates and manages database connections in turn.

Add a Trusted Source Using the CLI

How to Add a Trusted Source Using the DigitalOcean CLI

  1. Install doctl, the DigitalOcean command-line tool.

  2. Create a personal access token and save it for use with doctl.

  3. Use the token to grant doctl access to your DigitalOcean account.

              doctl auth init

  4. Finally, run doctl databases firewalls append. Basic usage looks like this, but you can read the usage docs for more details:

                doctl databases firewalls append <database-cluster-id> --rule <type>:<value> [flags]

    The following example appends a firewall rule to a database cluster with the ID ca9f591d-f38h-5555-a0ef-1c02d1d1e35 that allows any resources with the example-tag to access the database:

                  doctl databases firewalls append ca9f591d-f38h-5555-a0ef-1c02d1d1e35 --rule tag:example-tag

Add a Trusted Source Using the API

How to Add or Remove a Trusted Source Using the DigitalOcean API

  1. Create a personal access token and save it for use with the API.

  2. Send a PUT request to https://api.digitalocean.com/v2/databases/{database_cluster_uuid}/firewall

    cURL

    Using cURL:

                    curl -X PUT \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
  -d '{"rules": [{"type": "ip_addr","value": "192.168.1.1"},{"type": "droplet","value": "163973392"},{"type": "k8s","value": "ff2a6c52-5a44-4b63-b99c-0e98e7a63d61"},{"type": "tag","value": "backend"}]}' \
  "https://api.digitalocean.com/v2/databases/9cc10173-e9ea-4176-9dbc-a4cee4c4ff30/firewall"

    Go

    Using Godo, the official DigitalOcean V2 API client for Go: 

                    import (
    "context"
    "os"

    "github.com/digitalocean/godo"
)

func main() {
    token := os.Getenv("DIGITALOCEAN_TOKEN")

    client := godo.NewFromToken(token)
    ctx := context.TODO()

    req := godo.DatabaseUpdateFirewallRulesRequest{
      Rules: []*godo.DatabaseFirewallRule{
        {
         Type:  "ip_addr",
         Value: "192.168.1.1",
       },
        {
         Type:  "droplet",
         Value: "163973392",
       },
        {
         Type:  "k8s",
         Value: "ff2a6c52-5a44-4b63-b99c-0e98e7a63d61",
        },
      },
    }
    _, err := client.Databases.UpdateFirewallRules(ctx, dbID, &req)
}

    Python

                    import os
from pydo import Client

client = Client(token=os.environ.get("DIGITALOCEAN_TOKEN"))

req = {
  "rules": [
    {
      "type": "ip_addr",
      "value": "192.168.1.1"
    },
    {
      "type": "k8s",
      "value": "ff2a6c52-5a44-4b63-b99c-0e98e7a63d61"
    },
    {
      "type": "droplet",
      "value": "163973392"
    },
    {
      "type": "tag",
      "value": "backend"
    }
  ]
}
update_resp = client.databases.update_firewall_rules(database_cluster_uuid="a7a8bas", body=req)

Add a Trusted Source using the Control Panel

To restrict access to a database cluster, click the name of the cluster in the control panel to go to its Overview page, then click the Settings tab.

Screenshot of cluster settings page

In the section titled Trusted Sources, click Edit to open the Add trusted sources text box.

The open Trusted Sources section of the settings page

You can enter Droplets, Kubernetes clusters, tags, apps, or specific IP addresses. Entering a tag provides access to the database for any Droplets or Kubernetes nodes containing that tag. At this time, DigitalOcean Cloud Firewalls are not supported.

Warning
You currently cannot add IPv6 rules to a database cluster’s trusted sources.
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