{"id":3307,"date":"2026-07-24T11:12:54","date_gmt":"2026-07-24T11:12:54","guid":{"rendered":"https:\/\/certera.com\/kb\/?p=3307"},"modified":"2026-07-24T11:15:25","modified_gmt":"2026-07-24T11:15:25","slug":"how-to-install-ssl-certificates-on-linux-automatically-with-autoinstall-ssl","status":"publish","type":"post","link":"https:\/\/certera.com\/kb\/how-to-install-ssl-certificates-on-linux-automatically-with-autoinstall-ssl\/","title":{"rendered":"How to Install SSL Certificates on Linux Automatically With AutoInstall SSL?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Installing SSL certificates manually on Linux can be time-consuming and prone to configuration errors. <a href=\"https:\/\/certera.com\/ssl-automation\/rapidssl-automation\">AutoInstall SSL<\/a> simplifies the entire process by automatically importing your SSL certificate, configuring your web server, enabling HTTPS, and restarting the required services. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This step-by-step guide explains how to install SSL certificates automatically on Linux servers running Apache or NGINX, helping you deploy HTTPS quickly, securely, and with minimal manual effort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites Before You Start<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You must have <strong>root or sudo privileges <\/strong>on your Linux server:<\/li>\n\n\n\n<li>Possession of a <a href=\"https:\/\/certera.com\/buy-ssl-certificates\">valid SSL certificate<\/a> from your Certificate Authority (CA).<\/li>\n\n\n\n<li>The AutoInstall SSL package was downloaded.<\/li>\n\n\n\n<li>Correct pointing of your domain name towards your server IP address<\/li>\n\n\n\n<li>Listed as either Apache or NGINX already running.<\/li>\n\n\n\n<li>Include a firewall that will let any traffic through for HTTP\/HTTPS.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Normally, they skip one or more of these, and partway through the process something goes wrong.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step-by-Step Guide to Automatically Install SSL Certificates on Linux<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Connect to Your Linux Server<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In the terminal window: <strong>ssh root@your-server-ip<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Type in your password and\/or provide authentication with your SSH key.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This provides you direct access to configure SSL and websites on the command line.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Download the AutoInstall SSL Package<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First, go to the authorised downloads page of your server. Avoid packages hosted on third-party mirrors; these packages are vulnerable to compromise.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>Install with (on Linux):<\/strong> \nwget &lt;download-link>\u00a0\u00a0 or curl -O &lt;download-link><\/code><\/pre>\n\n\n\n<p class=\"quote-section wp-block-paragraph\"><strong>Tip: <\/strong>Always download the latest and most stable version. Legacy versions may not always support newer versions of OpenSSL libraries and newer Linux operating systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Install AutoInstall SSL on Linux<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Instead of downloading the package, extract: <\/strong>tar -xvf autoinstallssl.tar.gz<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Move into the extracted directory:<\/strong> cd autoinstallssl<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>Run the installer:<\/strong> \nsudo .\/install.sh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This will install the tool, including any dependencies that are required, without you having to scour the Internet for libraries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> If not all the packages (such as OpenSSL or Python) are installed, some distributions may require the setup to do so before it can be completed. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>If that occurs, take action and install them <\/strong>without overwriting existing configuration, and re-run the script.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Upload or Import an SSL Certificate<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before going further, there are three files that you need to collect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SSL Certificate (.crt)<\/li>\n\n\n\n<li>Private Key (.key)<\/li>\n\n\n\n<li>CA Bundle (.ca-bundle)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Import them with the following command, directly to the named AutoInstall SSL directory:<\/strong> autoinstallssl import<\/p>\n\n\n\n<p class=\"quote-section wp-block-paragraph\"><strong>Note: <\/strong>Please establish the file permissions again before continuing. The installation will fail silently or get a permission denied error if the server process is unable to read your private key. <strong>Make the keyfile to be read-only by the root user<\/strong>, so that it can be unlocked by the user who installs it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Select Your Web Server Type<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Select the server for SSL to take effect:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Apache<\/li>\n\n\n\n<li>NGINX<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">AutoInstall will scan and automatically discover configuration paths to find the SSL vulnerabilities of your system without having to point at a path yourself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example Paths:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Apache: <\/strong>\/etc\/httpd\/<\/li>\n\n\n\n<li><strong>NGINX: <\/strong>\/etc\/nginx\/<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This step is important \u2014 it is the key that will allow the tool to know what virtual host it is supposed to write the SSL settings for and not break the other virtual host rules.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6: Activate the Auto Installation Command<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>Use one command to trigger the deployment:<\/strong> \nautoinstallssl deploy<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>From there, it takes care of itself:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Properly checks your certificate files<\/li>\n\n\n\n<li>Testifies the SSL virtual host.<\/li>\n\n\n\n<li>Binds HTTPS to port 443 (the default port).<\/li>\n\n\n\n<li>Adds server updates<\/li>\n\n\n\n<li>Automatically restarts the web server when it quits.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Estimated time:<\/strong> 1-2 minutes for most setups.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And that&#8217;s where AutoInstall SSL comes into play. Manual deployment of config files can never be flawless and is prone to mistakes, so one command does the job right away.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7: Force A Website To Redirect To HTTPS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You can&#8217;t keep visitors from visiting the non-secure version of your site, HTTP, even if it has a live SSL certificate. A redirect must be enabled in your server&#8217;s config file.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RewriteRule ^ https:\/\/%{HTTP_HOST}%{REQUEST_URI} [L,R=301]<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For NGINX:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>return 301 https:\/\/$host$request_uri;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This will ensure that ALL visitors and ALL search engine crawlers will land on the secure version of your site.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8: Verify SSL Installation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After deployment, run a quick check when deployment is complete. Look for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTTPS loading correctly<\/li>\n\n\n\n<li>A padlock icon in the browser.<\/li>\n\n\n\n<li>No certificate warnings<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Look from a command line as well!<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>openssl s_client -connect yourdomain.com:443<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Alternatively, you could run a second check by using an online SSL test tool to determine an answer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Goal:<\/strong> Ensure that the certificate is in use (not just installed), chained and trusted by browsers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Common Installation Errors and How Do You Fix Them?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Permission Denied<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Typically indicates wrong file ownership permissions and\/or file security. Use sudo to run the command, or change the permissions of the certificate and key files.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Invalid Certificate Path<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Just make sure the .crt, .key, and .ca-bundle files have been uploaded to the correct location. The most common cause is the path typo.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Web Server cannot be found<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Test your config before restarting apachectl configtest or nginx -t&nbsp; will detect errors in the config before they remove your site.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a><\/a>Domain Mismatch<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Your SSL certificate needs to be identical to your domain, including subdomains such as www.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Installing SSL certificates manually on Linux can be time-consuming and prone to configuration errors. AutoInstall SSL simplifies the entire process by automatically importing your SSL certificate, configuring your web server, enabling HTTPS, and restarting the required services. This step-by-step guide explains how to install SSL certificates automatically on Linux servers running Apache or NGINX, helping<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/certera.com\/kb\/how-to-install-ssl-certificates-on-linux-automatically-with-autoinstall-ssl\/\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":3312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[474,475],"class_list":["post-3307","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-installation","tag-install-ssl-on-linux-automatically","tag-linux-autoinstall-ssl","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AutoInstall SSL for Linux: SSL Certificate Installation Guide<\/title>\n<meta name=\"description\" content=\"Follow this 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