It can also automatically handle the certificate renewal process. Certbot is responsible for communicating with Let’s Encrypt to request the certificate, perform any required ACME challenges, install the certificate, and configure the web server. It is compatible with most operating systems as well as the most popular web server software, such as Apache and NGINX. CertbotĬertbot was developed by the Electronic Frontier Foundation (EFF) with the end goal of improving web security by enabling HTTPS. The Let’s Encrypt site provides more comprehensive technical details about domain validation. Let’s Encrypt leverages the Automatic Certificate Management Environment (ACME) protocol to automate the certificate granting process through a challenge-response technique. It manages a free automated service that distributes basic SSL/TLS certificates to eligible websites. ![]() Let’s Encrypt is one of the most widely-used of these authorities. Let’s EncryptĪ web server must possess a signed public-key certificate from a trusted Certificate Authority before it can accept HTTPS requests. Review the Understanding TLS Certificates and Connections to learn more about TLS. ![]() However, all domains are strongly encouraged to enable HTTPS and a majority of all sites now use it. For this reason, HTTPS must be implemented on websites that handle financial or personal data. HTTPS protects the privacy and integrity of any data in transit and authenticates a website for the end-user. It encrypts network traffic using the Transport Layer Security (TLS) protocol, which replaces the older (and now deprecated) Secure Sockets Layer (SSL) technology. HTTPS builds upon the original Hypertext Transfer Protocol (HTTP) standard to offer a more secure browsing experience. Understanding HTTPS, TLS, Let’s Encrypt, and Certbot HTTPS and TLS/SSL If you are not familiar with the sudo command, see the Users and Groups guide. Commands that require elevated privileges are prefixed with sudo. This guide is written for a non-root user. You can review the Install a LEMP Stack on CentOS 7 guide for information on installing and configuring NGINX. The NGINX web server software installed on your server and configured for your domain. Review the DNS Records: An Introduction guide for more information on configuring DNS. A domain can be obtained through any registrar and can utilize any DNS service, such as Linode’s DNS Manager. Creating a Compute Instance and Setting Up and Securing a Compute Instance guides for information on deploying and configuring a Linode Compute Instance.Ī registered domain name with DNS records pointing to the IPv4 (and optionally IPv6) address of your server. ![]() Breaking this down further, the following components are required:Ī server running on CentOS 7 or RHEL 7 with credentials to a standard user account (belonging to the sudo group) and the ability to access the server through SSH or Lish. Supported distributions: RHEL 7 and CentOS 7 Before You Beginīefore continuing with this guide, you need a website accessible over HTTP using your desired domain name. ![]() It works directly with the free Let’s Encrypt certificate authority to request (or renew) a certificate, prove ownership of the domain, and install the certificate on NGINX (or other web servers). Certbot dramatically reduces the effort (and cost) of securing your websites with HTTPS. This guide provides instructions on using the open source Certbot utility with the NGINX web server on CentOS 7 and RHEL 7.
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