A bash script to install certbot and add crontab to renew the cert

setup-certbot-script.sh

#!/bin/bash
#
# This sets up Let's Encrypt SSL certificates and automatic renewal 
# using certbot: https://certbot.eff.org
#
# - Run this script as root.
# - A webserver must be up and running.
#
# Certificate files are placed into subdirectories under
# /etc/letsencrypt/live/*.
# 
# Configuration must then be updated for the systems using the 
# certificates.
#
# The certbot-auto program logs to /var/log/letsencrypt.
#

set -o nounset
set -o errexit

# May or may not have HOME set, and this drops stuff into ~/.local.
export HOME="/root"
export PATH="${PATH}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

# No package install yet.
wget https://dl.eff.org/certbot-auto
chmod a+x certbot-auto
mv certbot-auto /usr/local/bin

# Install the dependencies.
certbot-auto --noninteractive --os-packages-only

# Set up config file.
mkdir -p /etc/letsencrypt
cat > /etc/letsencrypt/cli.ini <<EOF
# Uncomment to use the staging/testing server - avoids rate limiting.
# server = https://acme-staging.api.letsencrypt.org/directory

# Use a 4096 bit RSA key instead of 2048.
rsa-key-size = 4096

# Set email and domains.
email = admin@example.com
domains = example.com, www.example.com

# Text interface.
text = True
# No prompts.
non-interactive = True
# Suppress the Terms of Service agreement interaction.
agree-tos = True

# Use the webroot authenticator.
authenticator = webroot
webroot-path = /var/www/html
EOF

# Obtain cert.
certbot-auto certonly

# Set up daily cron job.
CRON_SCRIPT="/etc/cron.daily/certbot-renew"

cat > "${CRON_SCRIPT}" <<EOF
#!/bin/bash
#
# Renew the Let's Encrypt certificate if it is time. It won't do anything if
# not.
#
# This reads the standard /etc/letsencrypt/cli.ini.
#

# May or may not have HOME set, and this drops stuff into ~/.local.
export HOME="/root"
# PATH is never what you want it it to be in cron.
export PATH="\${PATH}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

certbot-auto --no-self-upgrade certonly

# If the cert updated, we need to update the services using it. E.g.:
if service --status-all | grep -Fq 'apache2'; then
  service apache2 reload
fi
if service --status-all | grep -Fq 'httpd'; then
  service httpd reload
fi
if service --status-all | grep -Fq 'nginx'; then
  service nginx reload
fi
EOF
chmod a+x "${CRON_SCRIPT}"