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@@ -278,6 +278,32 @@ acme.sh --issue --dns dns_linode --dnssleep 900 -d example.com -d www.example.co
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The `LINODE_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
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+# 15. Use FreeDNS
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+
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+FreeDNS (https://freedns.afraid.org/) does not provide an API to update DNS records (other than IPv4 and IPv6
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+dynamic DNS addresses). The acme.sh plugin therefore retrieves and updates domain TXT records by logging
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+into the FreeDNS website to read the HTML and posting updates as HTTP. The plugin needs to know your
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+userid and password for the FreeDNS website.
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+
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+```sh
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+export FREEDNS_User="..."
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+export FREEDNS_Password="..."
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+```
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+
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+You need only provide this the first time you run the acme.sh client with FreeDNS validation and then again
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+whenever you change your password at the FreeDNS site. The acme.sh FreeDNS plugin does not store your userid
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+or password but rather saves an authentication token returned by FreeDNS in `~/.acme.sh/account.conf` and
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+reuses that when needed.
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+
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+Now you can issue a certificate.
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+
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+```sh
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+acme.sh --issue --dns dns_freedns --dnssleep 30 -d example.com -d www.example.com
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+```
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+
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+FreeDNS updates records quite quickly so it is possible to reduce the dnssleep time, in the above example
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+to 30 seconds.
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+
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# Use custom API
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If your API is not supported yet, you can write your own DNS API.
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David Kerr