mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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証明書の有効期限、自ホストのcronでこういうの走らせたらちゃんと外経由で確認してくれんじゃろか

#!/bin/sh

host=ホストのFQDN
:| openssl s_client -connect $host:443 -servername $host 2>/dev/null |\
openssl x509 -noout -checkend $(( 14 * 24 * 3600 )) ||\
echo $host の証明書、2週間以内に切れるめう