Question 1

How to set up Docker Cloudflare DDNS for IPv6?

Accepted Answer

Set the environment variable RRTYPE=AAAA and ensure Docker has IPv6 support or run with host networking. The container will then update AAAA records instead of A records for your domain.

Question 2

Docker Cloudflare DDNS vs ddclient: which is better for dynamic DNS?

Accepted Answer

Docker Cloudflare DDNS is containerized and Cloudflare-specific, offering simpler deployment for Docker users. ddclient supports multiple providers but requires more configuration and isn't container-native.

Question 3

How to use Docker secrets with Cloudflare DDNS for API keys?

Accepted Answer

Use the API_KEY_FILE parameter to point to a Docker secret file path. This keeps credentials secure and overrides the plaintext API_KEY variable if both are set.

Question 4

Can Docker Cloudflare DDNS update multiple subdomains at once?

Accepted Answer

No, it updates a single subdomain per instance. For multiple records, create CNAME records in Cloudflare pointing to the updated A or AAAA record, as mentioned in the README.

Question 5

What happens if my IP changes while the container is down?

Accepted Answer

DNS records persist unless DELETE_ON_STOP is enabled. If the IP changes, you might have stale entries until the container restarts and detects the new IP, so consider using automatic restarts.

Question 6

How to change the IP check frequency from the default 5 minutes?

Accepted Answer

Set the CRON environment variable to a custom cron expression, such as '@hourly' for hourly checks, to adjust how often the container verifies and updates the IP address.

Docker DDNS

What is Docker DDNS?

Overview

Use Cases

Best For

Related Projects

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Pros & Cons

Pros

Cons

Frequently Asked Questions