Check config options in generate-certs.sh

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• It uses certbot's docker to generate LetsEncrypt SSL certificates, and it comes with simple script to generate and renew certificate for single domain.
• It does not support multiple domains. But you can create certificate for test.com, abc.test.com, *.test.com (wildcard).

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Info:

• This script will create SSL certificates based on ${new_ssl_command}.
• If the ${live_certs_dir} and ${live_certs_dir}/cert.pem exist then certificate is renewed based on ${renew_command}
• Post hook is only executed:
  1. If a new ssl certificate is created.
  2. If certificate is renewed (test is done by comparing ${live_certs_dir}/cert.pem modified time to last one).

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Usage:

• Set configuration in generate-certs.sh
• Set executable permission: chmod +x generate-certs.sh
• Run: generate-certs.sh
• After the certificates are created:
  • Make sure to mount both certs/test.com/live and certs/test.com/archive directory, and use live/*.pem certificates in your nginx config.
    • Because archive directory has actual files, but live directory has symlink to archive. In archive, certs are stored like this fullchain1.pem, cert1.pem and number is increased based on renewals. But live folder has direct certificates without number like cert.pem, fullchain.pem
• Also use: https://github.com/certbot/certbot/blob/master/certbot-nginx/certbot_nginx/_internal/tls_configs/options-ssl-nginx.conf

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Example nginx config:

server {
    listen          443;
    server_name    test.com;

    #SSL - Set  in production.
    ssl_certificate /etc/letsencrypt/live/test.com/fullchain.pem; #managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/test.com/privkey.pem; #managed by Certbot
    include /etc/nginx/commons/letsencrypt-options-ssl-nginx.conf;
}

Important:

• In case of errors, try clearing certs/* folder and retry. (Although keep .gitkeep file.)
• Use dry_run=true to test certbot instead of actually creating/renewing certificates.

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Cron:

• Run this file under cron to keep the certificates updated.
• Certbot generate certificates with expiry of 90days, so run this script every day once.
• If a certificate is renewed (based on change of last-modified time, to existing certificate) then posthook is executed.
• You can restart nginx in posthook, to reload used certificates.
• Example:
  • nano /etc/cron.d/generate-certs-for-test.com
    • 0 1 * * * root /script-location/generate-certs.sh > /script-location/generate-certs.log