{"id":727,"date":"2026-10-15T12:37:45","date_gmt":"2026-10-15T12:37:45","guid":{"rendered":"https:\/\/velanremoteitsupport.com\/blog\/?post_type=techtips&#038;p=727"},"modified":"2026-10-15T12:52:00","modified_gmt":"2026-10-15T12:52:00","slug":"how-install-ssl-docker-troubleshooting","status":"publish","type":"techtips","link":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/","title":{"rendered":"Set up SSL\/TLS for an Application in Docker"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Overview<\/strong>&nbsp;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Terminating SSL at a reverse proxy (Nginx) in front of the container makes certificate management and application configuration easier. Nginx handles HTTPS and certificates and redirects requests to the application (serves plain HTTP internally) over an internal Docker network.&nbsp;<\/p>\n\n\n\n<p class=\"has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\"><strong>Client &#8211;HTTPS (443)&#8211;> Nginx (reverse proxy) &#8211;HTTP&#8211;> App container (e.g., 3000)\u00a0<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Prerequisites&nbsp;<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your application must already be running inside a Docker container. In this example, the application uses port 3000 to receive requests.<\/li>\n\n\n\n<li>You need a domain name. Also, a DNS record that connects this domain name to your server&#8217;s public IP address.\u00a0<\/li>\n\n\n\n<li>You need to allow ports 80 and 443 in your server firewall and any applicable cloud security group.<\/li>\n\n\n\n<li>An Ubuntu server with sudo access.<\/li>\n<\/ul>\n\n\n\n<div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\"><\/p> <ul class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1792063140781\"><strong class=\"schema-how-to-step-name\"><strong>Step 1: Bind the App to Localhost Only<\/strong>\u00a0<\/strong> <p class=\"schema-how-to-step-text\">Publish the container port on localhost so it can be accessed only through the proxy.<br>bash\u00a0<br>docker run -d &#8211;name myapp &#8211;restart unless-stopped -p 127.0.0.1:3000:3000 myapp:latest\u00a0<br>For Compose:\u00a0<br>yaml\u00a0<br>services:\u00a0<br>\u00a0\u00a0myapp:\u00a0<br>image: myapp:latest\u00a0<br>restart: unless-stopped\u00a0<br>ports:\u00a0<br>\u00a0\u00a0 &#8211; &#8220;127.0.0.1:3000:3000&#8221;\u00a0<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1792063169068\"><strong class=\"schema-how-to-step-name\"><strong>Step 2: Install Nginx and Certbot<\/strong>\u00a0<br><\/strong> <p class=\"schema-how-to-step-text\">bash\u00a0<br>sudo apt-get update\u00a0<br>sudo apt-get install -y nginx certbot python3-certbot-nginx\u00a0<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1792063191539\"><strong class=\"schema-how-to-step-name\"><strong>Step 3: Create the Nginx Site Configuration<\/strong>\u00a0<\/strong> <p class=\"schema-how-to-step-text\"><br>Create \/etc\/nginx\/sites-available\/app.example.com:\u00a0<br>nginx\u00a0<br>server {\u00a0<br>listen 80;\u00a0<br>server_name app.example.com;\u00a0<br>location \/ {\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_pass http:\/\/127.0.0.1:3000;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header Host $host;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Real-IP $remote_addr;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Forwarded-Proto $scheme;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_http_version 1.1;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header Upgrade $http_upgrade;\u00a0<br>\u00a0\u00a0\u00a0\u00a0 proxy_set_header Connection &#8220;upgrade&#8221;;\u00a0<br>}\u00a0<br>}\u00a0<br>Enable and test:\u00a0<br>bash\u00a0<br>sudo ln -s \/etc\/nginx\/sites-available\/app.example.com \/etc\/nginx\/sites-enabled\/\u00a0<br>sudo nginx -t &amp;&amp; sudo systemctl reload nginx\u00a0<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1792063248202\"><strong class=\"schema-how-to-step-name\"><strong>Step 4: Issue the Certificate (Let&#8217;s Encrypt)<\/strong>\u00a0<\/strong> <p class=\"schema-how-to-step-text\"><br>bash\u00a0<br>sudo certbot &#8211;nginx -d app.example.com &#8211;redirect -m admin@example.com &#8211;agree-tos -n\u00a0<br>Certbot obtains the certificate, updates the Nginx config for HTTPS, and adds an HTTP-to-HTTPS redirect.\u00a0<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1792063263434\"><strong class=\"schema-how-to-step-name\"><strong>Step 5: Verify Auto-Renewal<\/strong>\u00a0<br><\/strong> <p class=\"schema-how-to-step-text\">bash\u00a0<br>sudo systemctl status certbot.timer\u00a0<br>sudo certbot renew &#8211;dry-run\u00a0<br>Certificates are valid for 90 days and they will get renewed automatically.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1792063285313\"><strong class=\"schema-how-to-step-name\"><strong>Step 6: Validate<\/strong>\u00a0<\/strong> <p class=\"schema-how-to-step-text\"><br>bash\u00a0<br>curl -I https:\/\/app.example.com\u00a0<br>Also test with an external tool such as SSL Labs. This helps to confirm the chain and protocol configuration.<\/p> <\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Alternative A: Using a Commercial or Existing Certificate<\/strong>\u00a0<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Place the files on the server (e.g., \/etc\/ssl\/app\/fullchain.pem and privkey.pem, with the private key set to chmod 600), then use this in the Nginx server block:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">nginx&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server {&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">listen 443 ssl http2;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server_name app.example.com;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ssl_certificate \/etc\/ssl\/app\/fullchain.pem;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ssl_certificate_key \/etc\/ssl\/app\/privkey.pem;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ssl_protocols &nbsp; TLSv1.2 TLSv1.3;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">location \/ {&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp; proxy_pass http:\/\/127.0.0.1:3000;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp; proxy_set_header Host $host;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp; proxy_set_header X-Forwarded-Proto $scheme;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server {&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">listen 80;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server_name app.example.com;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">return 301 https:\/\/hostrequest_uri;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ensure fullchain.pem contains the server certificate followed by the intermediate certificates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Alternative B: Fully Containerized with Caddy (Automatic HTTPS)<\/strong>\u00a0<br><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Caddy obtains and renews certificates automatically with minimal configuration.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">docker-compose.yml:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">yaml&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">services:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;myapp:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">image: myapp:latest&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">restart: unless-stopped&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;caddy:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">image: caddy:2&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">restart: unless-stopped&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ports:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp; &#8211; &#8220;80:80&#8221;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp; &#8211; &#8220;443:443&#8221;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">volumes:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp; &#8211; .\/Caddyfile:\/etc\/caddy\/Caddyfile&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp; &#8211; caddy_data:\/data&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp; &#8211; caddy_config:\/config&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">volumes:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;caddy_data:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;caddy_config:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Caddyfile:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">app.example.com {&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">reverse_proxy myapp:3000&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run docker compose up -d. No need to publish ports for myapp. Caddy can access the application directly through the Docker Compose network.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" style=\"font-size:17px\"><strong>Security control configuration<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Allow only TLS 1.2 and TLS 1.3. Also, disable older and unsafe protocols.<\/li>\n\n\n\n<li>Enable HSTS after confirming HTTPS works correctly. This tells browsers to use HTTPS for future connections.<\/li>\n\n\n\n<li>add_header Strict-Transport-Security &#8220;max-age=31536000; includeSubDomains&#8221; always;\u00a0<\/li>\n\n\n\n<li>Never bake private keys into images. Don&#8217;t commit them to source control.<\/li>\n\n\n\n<li>Restrict firewall access to ports 80 (HTTP), 443 (HTTPS), and SSH only.<\/li>\n\n\n\n<li>Keep track of certificate expiry and renewal logs.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table aligncenter\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"3\"><strong>Troubleshooting&nbsp;<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Symptom&nbsp;<\/strong><\/td><td><strong>Likely Cause&nbsp;<\/strong><\/td><td><strong>Fix&nbsp;<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Certbot challenge fails&nbsp;<\/td><td>DNS not pointing to server, or port 80&nbsp;&nbsp;blocked&nbsp;<\/td><td>Verify the A record and firewall rules&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">502 Bad Gateway&nbsp;<\/td><td>Container down or wrong port&nbsp;<\/td><td>Check docker ps and the proxy_pass target&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Mixed content warnings&nbsp;<\/td><td>App generating HTTP links&nbsp;<\/td><td>Honor X-Forwarded-Proto in the app or framework&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Browser shows&nbsp; incomplete chain&nbsp;<\/td><td>Missing intermediate certificate&nbsp;<\/td><td>Use the full chain file&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Renewal fails&nbsp;<\/td><td>Port 80 closed or Nginx config error&nbsp;<\/td><td>Run certbot renew &#8211;dry-run and check&nbsp;&nbsp;\/var\/log\/letsencrypt\/&nbsp;&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Conclusion<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Velan&#8217;s remote infrastructure team can handle certificate issuance, reverse proxy setup, renewal monitoring, and TLS hardening remotely. We are an ISO certified firm for quality processes and data security. With<strong><a href=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-it-support-services\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-it-support-services\"> our managed services, <\/a><\/strong>we deliver the best container management solutions for our customers across 12+ countries, including the UK and the US. Contact our team at info@velanremoteitsupport.com<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" style=\"font-size:18px\"><strong>Questions and Answers About Docker <\/strong><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1792064022480\"><strong class=\"schema-faq-question\"><strong>What is a Docker image?<\/strong><br><\/strong> <p class=\"schema-faq-answer\">A Docker image is a lightweight, read-only software package template. It contains everything needed to run an application.\u00a0<br>A Docker image has<br>Application code<br>Libraries<br>Dependencies<br>Configuration\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792064034785\"><strong class=\"schema-faq-question\"><strong>Who is the best AWS Docker service provider?<\/strong><br><\/strong> <p class=\"schema-faq-answer\">Velan Remote IT Support offers the top managed service provider for Docker services in AWS. We have expertise in working with Docker container management and deployment technologies. Schedule a <strong><a href=\"https:\/\/velanremoteitsupport.com\/best-cloud-consulting-services-it-experts\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/best-cloud-consulting-services-it-experts\">free cloud consultation<\/a><\/strong> with our experts to get a customized <a href=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-aws-cloud-services\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-aws-cloud-services\"><strong>quote for AWS Docker services.<\/strong><\/a><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792064047207\"><strong class=\"schema-faq-question\"><strong>What is a Docker proxy service?<\/strong><\/strong> <p class=\"schema-faq-answer\"><br>As a <strong><a href=\"https:\/\/velanremoteitsupport.com\/azure-devops-containerization-service\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/azure-devops-containerization-service\">leading MSP for container management support<\/a><\/strong>, Velan Remote IT Support helps businesses configure and manage a Docker proxy for secure and reliable communication between containers and external systems. Our IT experts assist with proxy settings, network connectivity, access controls, and troubleshooting to keep Docker-based applications running smoothly.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1792064053222\"><strong class=\"schema-faq-question\"><strong>What is the solution for the Docker virtualization support detection error?<\/strong><\/strong> <p class=\"schema-faq-answer\"><br>The issue can be solved by doing the following steps<br>Open Task Manager\u2192 Performance \u2192 CPU.\u00a0<br>Check whether virtualization is enabled.<br>If it is disabled, restart your computer and enable virtualization in the BIOS\/UEFI settings.<br>Turn Windows features on in the Start menu.\u00a0<br>For Linux, enable &#8216;Virtual Machine Platform&#8217; and &#8216;Windows Subsystem&#8217;.<br>Open PowerShell as an administrator and run wsl &#8211;update.<br>Restart the computer.<br>Open Docker Desktop again and check whether the error is fixed.<\/p> <\/div> <\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview&nbsp; Terminating SSL at a reverse proxy (Nginx) in front of the container makes certificate management and application configuration easier. Nginx handles HTTPS and certificates and redirects requests to the application (serves plain HTTP internally) over an internal Docker network.&nbsp; Client &#8211;HTTPS (443)&#8211;> Nginx (reverse proxy) &#8211;HTTP&#8211;> App container (e.g., 3000)\u00a0 Prerequisites&nbsp; Alternative A: Using [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":734,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"techtips_category":[6],"class_list":["post-727","techtips","type-techtips","status-publish","has-post-thumbnail","hentry","techtips_category-technical-tips-from-the-managed-service-providers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Install SSL\/TLS in Docker | Troubleshooting Tips<\/title>\n<meta name=\"description\" content=\"Step-by-step guide to adding SSL to a Docker container with Nginx and Let\u2019s Encrypt. 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Schedule a <strong><a href=\"https:\/\/velanremoteitsupport.com\/best-cloud-consulting-services-it-experts\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/best-cloud-consulting-services-it-experts\">free cloud consultation<\/a><\/strong> with our experts to get a customized <a href=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-aws-cloud-services\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/outsourced-managed-aws-cloud-services\"><strong>quote for AWS Docker services.<\/strong><\/a>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#faq-question-1792064047207","position":3,"url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#faq-question-1792064047207","name":"What is a Docker proxy service?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<br>As a <strong><a href=\"https:\/\/velanremoteitsupport.com\/azure-devops-containerization-service\" data-type=\"link\" data-id=\"https:\/\/velanremoteitsupport.com\/azure-devops-containerization-service\">leading MSP for container management support<\/a><\/strong>, Velan Remote IT Support helps businesses configure and manage a Docker proxy for secure and reliable communication between containers and external systems. Our IT experts assist with proxy settings, network connectivity, access controls, and troubleshooting to keep Docker-based applications running smoothly.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#faq-question-1792064053222","position":4,"url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#faq-question-1792064053222","name":"What is the solution for the Docker virtualization support detection error?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<br>The issue can be solved by doing the following steps<br>Open Task Manager\u2192 Performance \u2192 CPU.\u00a0<br>Check whether virtualization is enabled.<br>If it is disabled, restart your computer and enable virtualization in the BIOS\/UEFI settings.<br>Turn Windows features on in the Start menu.\u00a0<br>For Linux, enable 'Virtual Machine Platform' and 'Windows Subsystem'.<br>Open PowerShell as an administrator and run wsl --update.<br>Restart the computer.<br>Open Docker Desktop again and check whether the error is fixed.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"HowTo","@id":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#howto-1","name":"Set up SSL\/TLS for an Application in Docker","mainEntityOfPage":{"@id":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/"},"description":"","step":[{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063140781","name":"Step 1: Bind the App to Localhost Only\u00a0","itemListElement":[{"@type":"HowToDirection","text":"Publish the container port on localhost so it can be accessed only through the proxy.bash\u00a0docker run -d --name myapp --restart unless-stopped -p 127.0.0.1:3000:3000 myapp:latest\u00a0For Compose:\u00a0yaml\u00a0services:\u00a0\u00a0\u00a0myapp:\u00a0image: myapp:latest\u00a0restart: unless-stopped\u00a0ports:\u00a0\u00a0\u00a0 - \"127.0.0.1:3000:3000\"\u00a0"}]},{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063169068","name":"Step 2: Install Nginx and Certbot\u00a0","itemListElement":[{"@type":"HowToDirection","text":"bash\u00a0sudo apt-get update\u00a0sudo apt-get install -y nginx certbot python3-certbot-nginx\u00a0"}]},{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063191539","name":"Step 3: Create the Nginx Site Configuration\u00a0","itemListElement":[{"@type":"HowToDirection","text":"Create \/etc\/nginx\/sites-available\/app.example.com:\u00a0nginx\u00a0server {\u00a0listen 80;\u00a0server_name app.example.com;\u00a0location \/ {\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_pass http:\/\/127.0.0.1:3000;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header Host $host;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Real-IP $remote_addr;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header X-Forwarded-Proto $scheme;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_http_version 1.1;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header Upgrade $http_upgrade;\u00a0\u00a0\u00a0\u00a0\u00a0 proxy_set_header Connection \"upgrade\";\u00a0}\u00a0}\u00a0Enable and test:\u00a0bash\u00a0sudo ln -s \/etc\/nginx\/sites-available\/app.example.com \/etc\/nginx\/sites-enabled\/\u00a0sudo nginx -t && sudo systemctl reload nginx\u00a0"}]},{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063248202","name":"Step 4: Issue the Certificate (Let's Encrypt)\u00a0","itemListElement":[{"@type":"HowToDirection","text":"bash\u00a0sudo certbot --nginx -d app.example.com --redirect -m admin@example.com --agree-tos -n\u00a0Certbot obtains the certificate, updates the Nginx config for HTTPS, and adds an HTTP-to-HTTPS redirect.\u00a0"}]},{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063263434","name":"Step 5: Verify Auto-Renewal\u00a0","itemListElement":[{"@type":"HowToDirection","text":"bash\u00a0sudo systemctl status certbot.timer\u00a0sudo certbot renew --dry-run\u00a0Certificates are valid for 90 days and they will get renewed automatically."}]},{"@type":"HowToStep","url":"https:\/\/velanremoteitsupport.com\/blog\/techtips\/how-install-ssl-docker-troubleshooting\/#how-to-step-1792063285313","name":"Step 6: Validate\u00a0","itemListElement":[{"@type":"HowToDirection","text":"bash\u00a0curl -I https:\/\/app.example.com\u00a0Also test with an external tool such as SSL Labs. This helps to confirm the chain and protocol configuration."}]}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/techtips\/727","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/techtips"}],"about":[{"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/types\/techtips"}],"author":[{"embeddable":true,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/comments?post=727"}],"version-history":[{"count":5,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/techtips\/727\/revisions"}],"predecessor-version":[{"id":733,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/techtips\/727\/revisions\/733"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/media\/734"}],"wp:attachment":[{"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/media?parent=727"}],"wp:term":[{"taxonomy":"techtips_category","embeddable":true,"href":"https:\/\/velanremoteitsupport.com\/blog\/wp-json\/wp\/v2\/techtips_category?post=727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}