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-#+title: Dynamic DNS with Cloudflare API
-#+date: 2022-03-23
-#+description: Learn how to dynamically update DNS records for changing IPs with Cloudflare.
-#+filetags: :sysadmin:
-
-* DDNS: Dynamic DNS
-If you're hosting a service from a location with dynamic DNS (where your
-IP may change at any time), you must have a solution to update the DNS
-so that you can access your service even when the IP of the server
-changes.
-
-The process below uses the [[https://api.cloudflare.com/][Cloudflare
-API]] to update DNS =A= and =AAAA= records with the server's current IP.
-If you use another DNS provider, you will have to find a way to update
-your DNS (or find a way to get a static IP).
-
-First, install =jq= since we will use it in the next script:
-
-#+begin_src sh
-sudo apt install jq
-#+end_src
-
-Next, create a location for your DDNS update scripts and open the first
-script:
-
-#+begin_src sh
-mkdir ~/ddns
-nano ~/ddns/update.sh
-#+end_src
-
-The following =update.sh= script will take all of your domains and
-subdomains and check Cloudflare to see if the current =A= and =AAAA=
-records match your server's IP address. If not, it will update the
-records.
-
-#+begin_src sh
-# file: update.sh
-#!/bin/bash
-
-# Update TLDs
-domains=(example.com example.net)
-
-for domain in "${domains[@]}"
-do
-  echo -e "\nUpdating $domain..."
-  zone_name=$domain /home/<your-username>/ddns/ddns.sh
-done
-
-# Update subdomains for example.com
-domain=example.com
-subdomains=(photos.example.com)
-
-for subdomain in "${subdomains[@]}"
-do
-  echo -e "\nUpdating $subdomain..."
-  zone_name=$domain  dns_record=$subdomain /home/<your-username>/ddns/ddns.sh
-done
-#+end_src
-
-Next, open up the =ddns.sh= script. Paste the following into the script
-and update the =api_token= and =email= variables.
-
-#+begin_src sh
-nano ~/ddns/ddns.sh
-#+end_src
-
-*Note*: If you want your DNS records to be proxied through
-Cloudflare, find and update the following snippet: ="proxied":false}"=
-to say =true= instead of =false=.
-
-#+begin_src sh
-# file: ddns.sh
-#!/bin/bash
-# based on https://gist.github.com/Tras2/cba88201b17d765ec065ccbedfb16d9a
-# initial data; they need to be filled by the user
-## API token
-api_token=<YOUR_API_TOKEN>
-## email address associated with the Cloudflare account
-email=<YOUR_EMAIL>
-
-# get the basic data
-ipv4=$(curl -s -X GET -4 https://ifconfig.co)
-ipv6=$(curl -s -X GET -6 https://ifconfig.co)
-user_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/user/tokens/verify" \
-               -H "Authorization: Bearer $api_token" \
-               -H "Content-Type:application/json" \
-          | jq -r '{"result"}[] | .id'
-         )
-
-echo "Your IPv4 is: $ipv4"
-echo "Your IPv6 is: $ipv6"
-
-# check if the user API is valid and the email is correct
-if [ $user_id ]
-then
-    zone_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone_name&status=active" \
-                   -H "Content-Type: application/json" \
-                   -H "X-Auth-Email: $email" \
-                   -H "Authorization: Bearer $api_token" \
-              | jq -r '{"result"}[] | .[0] | .id'
-             )
-    # check if the zone ID is
-    if [ $zone_id ]
-    then
-        # check if there is any IP version 4
-        if [ $ipv4 ]
-        then
-            dns_record_a_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?type=A&name=$dns_record"  \
-                                   -H "Content-Type: application/json" \
-                                   -H "X-Auth-Email: $email" \
-                                   -H "Authorization: Bearer $api_token"
-                             )
-            # if the IPv6 exist
-            dns_record_a_ip=$(echo $dns_record_a_id |  jq -r '{"result"}[] | .[0] | .content')
-            echo "The set IPv4 on Cloudflare (A Record) is:    $dns_record_a_ip"
-            if [ $dns_record_a_ip != $ipv4 ]
-            then
-                # change the A record
-                curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$(echo $dns_record_a_id | jq -r '{"result"}[] | .[0] | .id')" \
-                     -H "Content-Type: application/json" \
-                     -H "X-Auth-Email: $email" \
-                     -H "Authorization: Bearer $api_token" \
-                     --data "{"type":"A","name":"$dns_record","content":"$ipv4","ttl":1,"proxied":false}" \
-                | jq -r '.errors'
-            else
-                echo "The current IPv4 and DNS record IPv4 are the same."
-            fi
-        else
-            echo "Could not get your IPv4. Check if you have it; e.g. on https://ifconfig.co"
-        fi
-
-        # check if there is any IP version 6
-        if [ $ipv6 ]
-        then
-            dns_record_aaaa_id=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records?type=AAAA&name=$dns_record"  \
-                                      -H "Content-Type: application/json" \
-                                      -H "X-Auth-Email: $email" \
-                                      -H "Authorization: Bearer $api_token"
-                                )
-            # if the IPv6 exist
-            dns_record_aaaa_ip=$(echo $dns_record_aaaa_id | jq -r '{"result"}[] | .[0] | .content')
-            echo "The set IPv6 on Cloudflare (AAAA Record) is: $dns_record_aaaa_ip"
-            if [ $dns_record_aaaa_ip != $ipv6 ]
-            then
-                # change the AAAA record
-                curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$(echo $dns_record_aaaa_id | jq -r '{"result"}[] | .[0] | .id')" \
-                     -H "Content-Type: application/json" \
-                     -H "X-Auth-Email: $email" \
-                     -H "Authorization: Bearer $api_token" \
-                     --data "{"type":"AAAA","name":"$dns_record","content":"$ipv6","ttl":1,"proxied":false}" \
-                | jq -r '.errors'
-            else
-                echo "The current IPv6 and DNS record IPv6 are the same."
-            fi
-        else
-            echo "Could not get your IPv6. Check if you have it; e.g. on https://ifconfig.co"
-        fi
-    else
-        echo "There is a problem with getting the Zone ID. Check if the Zone Name is correct."
-    fi
-else
-    echo "There is a problem with either the email or the password"
-fi
-#+end_src
-
-Once the script is saved and closed, make the scripts executable:
-
-#+begin_src sh
-chmod +x ~/ddns/ddns.sh
-chmod +x ~/ddns/update.sh
-#+end_src
-
-You can test the script by running it manually:
-
-#+begin_src sh
-./update.sh
-#+end_src
-
-To make sure the scripts run automatically, add it to the =cron= file so
-that it will run on a schedule. To do this, open the cron file:
-
-#+begin_src sh
-crontab -e
-#+end_src
-
-In the cron file, paste the following at the bottom of the editor:
-
-#+begin_src sh
-,*/5 ** ** ** ** bash /home/<your_username>/ddns/update.sh
-#+end_src