I've been using this docker container over a year, with no issues. https://hub.docker.com/r/oznu/cloudflare-ddns/
But there's also this script: https://github.com/joshuar/cf-ddns
I've been using this docker container over a year, with no issues. https://hub.docker.com/r/oznu/cloudflare-ddns/
But there's also this script: https://github.com/joshuar/cf-ddns