{"id":940,"date":"2016-11-15T14:42:56","date_gmt":"2016-11-15T09:12:56","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=940"},"modified":"2026-08-08T09:59:58","modified_gmt":"2026-08-08T04:29:58","slug":"install-and-configure-ssl-using-letsencrypt","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/install-and-configure-ssl-using-letsencrypt\/","title":{"rendered":"How to Install and Configure Free SSL with Let&#8217;s Encrypt on CentOS"},"content":{"rendered":"\n<p>Securing your website with HTTPS is no longer optional \u2014 it&#8217;s a baseline requirement for user trust, SEO rankings, and browser compatibility. <strong>Let&#8217;s Encrypt<\/strong> makes this easy by offering free, automated SSL\/TLS certificates through a nonprofit Certificate Authority backed by the Internet Security Research Group (ISRG).<\/p>\n\n\n\n<p>In this guide, you&#8217;ll learn how to install and configure a free Let&#8217;s Encrypt SSL certificate on a <strong>CentOS server running Apache<\/strong>, using <strong>Certbot<\/strong> (the modern, actively maintained successor to the original <code>letsencrypt-auto<\/code> client). We&#8217;ll also cover certificate renewal automation and a bonus section for zPanel users.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Use Let&#8217;s Encrypt for SSL?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Free<\/strong> \u2014 no licensing or purchase cost, unlike traditional SSL vendors<\/li>\n\n\n\n<li><strong>Automated<\/strong> \u2014 issuance and renewal can be fully scripted<\/li>\n\n\n\n<li><strong>Trusted<\/strong> \u2014 certificates are recognized by all major browsers<\/li>\n\n\n\n<li><strong>Short-lived by design<\/strong> \u2014 certificates are valid for 90 days, encouraging automated renewal and better long-term security hygiene<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<p>Before you begin, make sure you have:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>A CentOS server (CentOS 7 or 8; steps are similar for CentOS Stream and RHEL-based distros)<\/li>\n\n\n\n<li>Apache (<code>httpd<\/code>) installed and serving your website<\/li>\n\n\n\n<li>Root or <code>sudo<\/code> access to the server<\/li>\n\n\n\n<li>A registered domain name with DNS <strong>A record<\/strong> pointing to your server&#8217;s public IP address<\/li>\n\n\n\n<li>Port <strong>80<\/strong> and <strong>443<\/strong> open in your firewall \/ security group<\/li>\n\n\n\n<li>A valid email address for renewal and security notifications<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Note:<\/strong> The original <code>letsencrypt-auto<\/code> tool referenced in older tutorials has been deprecated. The steps below use <strong>Certbot<\/strong>, which is the officially supported client for issuing and renewing Let&#8217;s Encrypt certificates today.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Update Your System and Install Required Packages<\/h2>\n\n\n\n<p>Start by updating your package index and installing EPEL (Extra Packages for Enterprise Linux), which provides access to the Certbot package:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo yum update -y\nsudo yum install epel-release -y\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Install Certbot and the Apache Plugin<\/h2>\n\n\n\n<p>Install Certbot along with the Apache plugin, which automatically detects and configures your virtual host:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo yum install certbot python3-certbot-apache -y\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Verify Apache Is Running<\/h2>\n\n\n\n<p>Confirm Apache is active and listening on port 80, since Certbot needs to reach your domain over HTTP to validate ownership:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl status httpd\n<\/pre>\n\n\n\n<p>If it&#8217;s not running, start it:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl start httpd\nsudo systemctl enable httpd\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Obtain and Install the SSL Certificate<\/h2>\n\n\n\n<p>Run Certbot with the Apache plugin. This single command validates your domain, issues the certificate, and configures Apache&#8217;s SSL virtual host automatically:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo certbot --apache -d domain.tld -d www.domain.tld\n<\/pre>\n\n\n\n<p>During the process, Certbot will prompt you to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Enter a recovery\/notification email address<\/li>\n\n\n\n<li>Agree to the Let&#8217;s Encrypt Terms of Service<\/li>\n\n\n\n<li>Choose whether to redirect all HTTP traffic to HTTPS (recommended: choose <strong>yes<\/strong>)<\/li>\n<\/ul>\n\n\n\n<p>On success, you&#8217;ll see a confirmation similar to:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Congratulations! You have successfully enabled HTTPS on\nhttps:\/\/domain.tld and https:\/\/www.domain.tld\nYour certificate and chain have been saved at:\n\/etc\/letsencrypt\/live\/domain.tld\/fullchain.pem\nYour key file has been saved at:\n\/etc\/letsencrypt\/live\/domain.tld\/privkey.pem\nYour certificate will expire on 2026-11-06.<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Review the Apache SSL Configuration (Optional Manual Setup)<\/h2>\n\n\n\n<p>Certbot typically writes the SSL configuration for you, but if you&#8217;re configuring a virtual host manually, use a modern, secure cipher configuration like this:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ServerName domain.tld\nServerAlias www.domain.tld\nDocumentRoot \"\/var\/www\/html\"\nSSLEngine on\nSSLProtocol -all +TLSv1.2 +TLSv1.3\nSSLHonorCipherOrder On\nSSLCipherSuite HIGH:!aNULL:!MD5:!3DES\nSSLCertificateFile \/etc\/letsencrypt\/live\/domain.tld\/fullchain.pem\nSSLCertificateKeyFile \/etc\/letsencrypt\/live\/domain.tld\/privkey.pem\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Security tip:<\/strong> Avoid enabling SSLv2, SSLv3, or 3DES ciphers \u2014 these are outdated and considered insecure by modern standards. Stick to TLS 1.2 and TLS 1.3.<\/p>\n<\/blockquote>\n\n\n\n<p>Restart Apache to apply any manual changes:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl restart httpd\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Verify Your SSL Installation<\/h2>\n\n\n\n<p>Confirm your certificate is installed correctly using a free SSL checker tool, such as <a href=\"https:\/\/www.ssllabs.com\/ssltest\/\">SSL Labs&#8217; SSL Test<\/a>. A correct installation should show a valid chain of trust with no configuration warnings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 7: Automate Certificate Renewal<\/h2>\n\n\n\n<p>Let&#8217;s Encrypt certificates expire every 90 days, so automated renewal is essential. Certbot installs a systemd timer or cron job by default, but you can verify and test it manually:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo certbot renew --dry-run\n<\/pre>\n\n\n\n<p>If you prefer an explicit cron entry, add one to run twice daily (Certbot&#8217;s recommended frequency), which only renews certificates nearing expiration:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo crontab -e\n<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">0 0,12 * * * \/usr\/bin\/certbot renew --quiet --post-hook \"systemctl reload httpd\"\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Bonus: Configuring SSL on zPanel<\/h2>\n\n\n\n<p>If you&#8217;re managing your server through zPanel, you can still use Certbot to obtain the certificate (<code>sudo certbot certonly --standalone -d domain.tld<\/code>), then apply it through the control panel:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to <strong>zPanel > Module Admin > Apache Config > Override a Virtualhost<\/strong><\/li>\n\n\n\n<li>Select <strong>domain.tld<\/strong> from the dropdown list<\/li>\n\n\n\n<li>Set the following:\n<ul class=\"wp-block-list\">\n<li><strong>Port Override:<\/strong> 443<\/li>\n\n\n\n<li><strong>Forward Port 80 to Overridden Port:<\/strong> Enable<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Add this SSL configuration block:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>SSLEngine on\nSSLProtocol -all +TLSv1.2 +TLSv1.3\nSSLHonorCipherOrder On\nSSLCipherSuite HIGH:!aNULL:!MD5:!3DES\nSSLCertificateFile \/etc\/letsencrypt\/live\/domain.tld\/fullchain.pem\nSSLCertificateKeyFile \/etc\/letsencrypt\/live\/domain.tld\/privkey.pem\n<\/code><\/pre>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li>Apply the changes:<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">php -q \/etc\/zpanel\/panel\/bin\/daemon.php\n<\/pre>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li>Restart Apache:<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl restart httpd\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<p><strong>Is Let&#8217;s Encrypt SSL as secure as a paid certificate?<\/strong> Yes. Let&#8217;s Encrypt issues Domain Validation (DV) certificates using the same encryption standards as paid DV certificates. The main differences with paid options are extended validation branding and support SLAs, not encryption strength.<\/p>\n\n\n\n<p><strong>How often do I need to renew my certificate?<\/strong> Every 90 days. Setting up the automated renewal in Step 7 means you won&#8217;t need to do this manually.<\/p>\n\n\n\n<p><strong>Can I use Let&#8217;s Encrypt on multiple subdomains?<\/strong> Yes \u2014 add multiple <code>-d<\/code> flags to the Certbot command, for example: <code>-d domain.tld -d www.domain.tld -d shop.domain.tld<\/code>.<\/p>\n\n\n\n<p><strong>What happens if my certificate expires?<\/strong> Visitors will see browser security warnings and HTTPS connections will fail until the certificate is renewed. This is why automated renewal is critical.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Installing SSL with Let&#8217;s Encrypt on CentOS is quick, free, and \u2014 with Certbot \u2014 largely automated from issuance through renewal. By following the steps above, you&#8217;ll have a fully working HTTPS setup on Apache, a hardened cipher configuration, and a renewal job that keeps your certificate valid without manual intervention.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Securing your website with HTTPS is no longer optional \u2014 it&#8217;s a baseline requirement for user trust, SEO rankings, and browser compatibility. Let&#8217;s Encrypt makes this easy by offering free, automated SSL\/TLS certificates through a nonprofit Certificate Authority backed by the Internet Security Research Group (ISRG). In this guide, you&#8217;ll&hellip; <a href=\"https:\/\/pheonixsolutions.com\/blog\/install-and-configure-ssl-using-letsencrypt\/\" class=\"more-link read-more\" rel=\"bookmark\">Continue Reading <span class=\"screen-reader-text\">How to Install and Configure Free SSL with Let&#8217;s Encrypt on CentOS<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[225],"tags":[],"class_list":{"0":"post-940","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-linux","7":"h-entry","9":"h-as-article"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pheonix Solutions - We Empower Your Business Growth<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pheonixsolutions.com\/blog\/install-and-configure-ssl-using-letsencrypt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pheonix Solutions - We Empower Your Business Growth\" \/>\n<meta property=\"og:description\" content=\"Securing your website with HTTPS is no longer optional \u2014 it&#8217;s a baseline requirement for user trust, SEO rankings, and browser compatibility. 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We Empower Your Business Growth","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/pheonixsolutions.com\/blog\/install-and-configure-ssl-using-letsencrypt\/","og_locale":"en_US","og_type":"article","og_title":"Pheonix Solutions - We Empower Your Business Growth","og_description":"Securing your website with HTTPS is no longer optional \u2014 it&#8217;s a baseline requirement for user trust, SEO rankings, and browser compatibility. Let&#8217;s Encrypt makes this easy by offering free, automated SSL\/TLS certificates through a nonprofit Certificate Authority backed by the Internet Security Research Group (ISRG). 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