I’ve started using let’s encrypt for the first time thanks to this guide that brought me here for configuring XMPP servers with SSL: https://wiki.xmpp.org/web/Securing_XMPP
The guide doesn’t point out exactly which certificate should be used when configuring ejabberd and was wondering if anyone here might be able to help.
As there doesn't seem to be a separate parameter for intermediate certificates fullchain.pem should do.
According to https://raymii.org/s/tutorials/Ejabberd_SSL_Certificate.html ejabberd wants all “separate” items (private key, certificate and chain) in one file. As fullchain.pem is missing the private key, you should make the needed file yourself (or with a script with one of the certbot “hooks” for automation)
So: cat privkey.pem cert.pem chain.pem > ejabberd.pem (or: cat privkey.pem fullchain.pem > ejabberd.pem
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