certonly subcommand to obtain a cert for a domain. By default certbot is obtaining a cert in PEM format. Is it possible to obtain a DER format cert?
All files are PEM-encoded. If you need other format, such as DER or PFX, then you could convert using openssl. You can automate that with --deploy-hook if you’re using automatic renewal.
You will probably need to write a script and point
--deploy-hook at it, that runs something like:
#!/bin/sh openssl x509 -outform der -in $RENEWED_LINEAGE/fullchain.pem -out $RENEWED_LINEAGE/fullchain.der
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