Generate PFX file from Let's Encrypt PEM files for Azure Application Service

script.sh

# STEP 1
# Frist, generate PEM files using certbot docker image
docker run --rm -it -v ".:/etc/letsencrypt" certbot/certbot certonly --manual --preferred-challenges dns -d "domain.com" -d "*.domain.com"

# Follow the certbot instructions
# Remember that multiple TXT records with the same host are allowed
# so you can add TXT record for naked and wildcard validations.

# STEP 2
# Generate FPX file using Ubuntu docker image
docker run --rm -it -v ".:/home/certificates" ubuntu:focal

# Once inside the container run:
apt-get update
apt-get install openssl
cd /home/certificates

# Navigate to where your PEM files are located and run:
openssl pkcs12 -export -out certificate.pfx -inkey privkey.pem -in fullchain.pem

# STEP 3
# Got to your Azure Application Service and add the PFX file.