{"id":10487,"date":"2025-07-22T14:34:36","date_gmt":"2025-07-22T14:34:36","guid":{"rendered":"https:\/\/www.magetop.com\/blog\/?p=10487"},"modified":"2025-07-22T14:34:40","modified_gmt":"2025-07-22T14:34:40","slug":"solving-dns-resolution-issues-inside-docker-containers","status":"publish","type":"post","link":"https:\/\/www.magetop.com\/blog\/solving-dns-resolution-issues-inside-docker-containers\/","title":{"rendered":"Solving DNS Resolution Issues Inside Docker Containers"},"content":{"rendered":"\n<p>Sometimes, a Docker container can\u2019t resolve hostnames like <code>example.com<\/code> or your private APIs \u2014 even though they work fine on the host. In this post, you\u2019ll learn why DNS resolution fails inside containers and How To Fix DNS Resolution Issues Inside Docker.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">What Is DNS Resolution in Docker?<\/h4>\n\n\n\n<p>DNS (Domain Name System) translates domain names into IP addresses. Inside Docker containers, DNS resolution depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Docker\u2019s internal DNS system (<code>127.0.0.11<\/code>)<\/li>\n\n\n\n<li>The host machine&#8217;s DNS configuration<\/li>\n\n\n\n<li>Network mode and bridge behavior<\/li>\n<\/ul>\n\n\n\n<p>When something goes wrong, containers can\u2019t access the internet or other services via domain names.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Common Symptom<\/h4>\n\n\n\n<p>You run this inside a container:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\nping example.com\n<\/pre><\/div>\n\n\n<p>And get:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\nping: example.com: Temporary failure in name resolution\n<\/pre><\/div>\n\n\n<p>Or in Python:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nimport requests\nrequests.get(&quot;https:\/\/example.com&quot;)\n<\/pre><\/div>\n\n\n<p>And see:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\nrequests.exceptions.ConnectionError: Failed to establish a new connection: &#x5B;Errno -3] Temporary failure in name resolution\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\">Step-by-Step To Fix DNS Resolution Issues Inside Docker<\/h2>\n\n\n\n<p><strong>1. Check If the Container Has Internet<\/strong><\/p>\n\n\n\n<p>Run this:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\ndocker run busybox nslookup example.com\n<\/pre><\/div>\n\n\n<p>If you get:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\nnslookup: can't resolve 'example.com': Name does not resolve\n<\/pre><\/div>\n\n\n<p>\u2192 There&#8217;s a DNS problem.<\/p>\n\n\n\n<p>If it returns an IP \u2192 DNS works!<\/p>\n\n\n\n<p><strong>2. Manually Set DNS Server in Docker Run<\/strong><\/p>\n\n\n\n<p>Try using Google DNS (8.8.8.8):<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\ndocker run --dns=8.8.8.8 busybox nslookup example.com\n<\/pre><\/div>\n\n\n<p>If it works, the issue is your Docker daemon&#8217;s default DNS config.<\/p>\n\n\n\n<p><strong>3. Fix DNS for All Containers via Daemon Config<\/strong><\/p>\n\n\n\n<p>Edit or create the Docker daemon configuration file:<\/p>\n\n\n\n<p><strong>Linux\/Mac:<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n\/etc\/docker\/daemon.json\n<\/pre><\/div>\n\n\n<p><strong>Windows:<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nC:\\ProgramData\\Docker\\config\\daemon.json\n<\/pre><\/div>\n\n\n<p>Add this:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n{\n  &quot;dns&quot;: &#x5B;&quot;8.8.8.8&quot;, &quot;8.8.4.4&quot;]\n}\n<\/pre><\/div>\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"601\" data-attachment-id=\"10489\" data-permalink=\"https:\/\/www.magetop.com\/blog\/solving-dns-resolution-issues-inside-docker-containers\/screenshot_1-30\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?fit=1023%2C768&amp;ssl=1\" data-orig-size=\"1023,768\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Screenshot_1\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?fit=300%2C225&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?fit=800%2C601&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?resize=800%2C601&#038;ssl=1\" alt=\"DNS Resolution Issues Inside Docker\" class=\"wp-image-10489\" srcset=\"https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?w=1023&amp;ssl=1 1023w, https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.magetop.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot_1-2.png?resize=768%2C577&amp;ssl=1 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Then restart Docker:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: powershell; title: ; notranslate\" title=\"\">\n# Linux\/macOS:\nsudo systemctl restart docker\n\n# Windows:\nRestart Docker Desktop from the system tray\n<\/pre><\/div>\n\n\n<p><strong>4. Use Host Network (Linux-only)<\/strong><\/p>\n\n\n\n<p>If your container needs the exact DNS config of your host:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\ndocker run --network host busybox nslookup example.com\n<\/pre><\/div>\n\n\n<p>\u26a0\ufe0f Only works on <strong>Linux<\/strong> \u2014 not Docker Desktop for Mac\/Windows.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Why This Happens<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Docker uses its own embedded DNS server (<code>127.0.0.11<\/code>)<\/li>\n\n\n\n<li>If your host\u2019s <code>\/etc\/resolv.conf<\/code> has problems (e.g. systemd-resolved, VPN conflicts), containers inherit it<\/li>\n\n\n\n<li>Docker Desktop (on Windows\/macOS) may behave differently based on WSL2 or Hyper-V<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Summary<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Problem<\/strong><\/td><td><strong>Solution<\/strong><\/td><\/tr><tr><td><code>Temporary failure in resolution<\/code><\/td><td>Use <code>--dns=8.8.8.8<\/code> or fix daemon DNS<\/td><\/tr><tr><td>Container can&#8217;t reach domains<\/td><td>Check <code>\/etc\/resolv.conf<\/code><\/td><\/tr><tr><td>VPN interferes with DNS<\/td><td>Restart Docker, try public DNS<br><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>DNS resolution issues in Docker are common \u2014 but once you know how Docker handles DNS, they&#8217;re easy to troubleshoot. Whether you\u2019re running Python scripts, curl, or full-stack apps, setting the correct DNS can save hours of debugging.<\/p>\n\n\n\n<p>This is the end of the\u00a0<strong>Solving DNS Resolution Issues Inside Docker Containers.<\/strong><\/p>\n\n\n\n<p>You can read more useful articles like<strong>\u00a0<a href=\"https:\/\/www.magetop.com\/blog\/fix-bind-for-0-0-0-0-80-failed-error-in-docker\/\">How to Fix \u2018Bind for 0.0.0.0:80 Failed\u2019 Error in Docker<\/a>.<\/strong><\/p>\n\n\n\n<p>Follow us for the more helpful posts!<\/p>\n\n\n\n<p>We hope this is a useful post for you.<\/p>\n<p>\u00a0<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Sometimes, a Docker container can\u2019t resolve hostnames like example.com or your private APIs \u2014 even though they work fine on<\/p>\n","protected":false},"author":106,"featured_media":10491,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[2393,2396,2394],"class_list":["post-10487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-magento-2-tutorials","tag-dns-resolution-issues","tag-resolution-issues-inside-docker-containers","tag-solving-dns-resolution-issues-inside-docker-containers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Solving DNS Resolution Issues Inside Docker Containers - Magetop Blog<\/title>\n<meta name=\"description\" content=\"Sometimes, a Docker container can\u2019t resolve hostnames like example.com or your private APIs \u2014 even though they work fine on the host. 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