{"id":5042,"date":"2026-08-30T04:00:34","date_gmt":"2026-08-29T19:00:34","guid":{"rendered":"https:\/\/donguri3.net\/server-tech\/docker-koel-music-server-troubleshooting-2\/"},"modified":"2026-08-30T04:00:35","modified_gmt":"2026-08-29T19:00:35","slug":"docker-koel-music-server-troubleshooting","status":"publish","type":"post","link":"https:\/\/donguri3.net\/en\/server-tech\/virtualization-container-wsl\/docker-koel-music-server-troubleshooting\/","title":{"rendered":"Building a Koel Music Server in a Docker Environment"},"content":{"rendered":"<p class=\"\">In this post, I will share the troubleshooting steps I went through when building a music server using the <a class=\"\" href=\"https:\/\/github.com\/koel\/docker\" target=\"_new\" rel=\"noopener\">Koel Docker repository<\/a>. It was my first time trying this, and while I ran into several issues, finding the solutions was a great learning experience.<\/p>\n<h2 class=\"\">Introduction<\/h2>\n<p class=\"\">Using Docker allows you to easily deploy web applications like Koel, eliminating the hassle of complex dependency and environment configurations. However, in actual operation, it is not uncommon to encounter minor configuration mistakes or environment-dependent issues. The problem I faced was a &quot;500 Internal Server Error&quot; displayed in the browser.<\/p>\n<h2 class=\"\">Initial Trouble: Encountering a 500 Internal Server Error<\/h2>\n<p class=\"\">After setting up the environment for the first time, accessing the browser resulted in a &quot;500 Internal Server Error,&quot; and the page failed to load properly. This error is often caused by server-side configuration errors or file inconsistencies, requiring investigation such as checking the logs.<br \/>\n<a href=\"https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e.png\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-1275\" src=\"https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e-300x189.png\" alt=\"koel &quot;500 Internal Server Error&quot;\" width=\"300\" height=\"189\" srcset=\"https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e-300x189.png 300w, https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e-530x334.png 530w, https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e-565x356.png 565w, https:\/\/donguri3.net\/wp-content\/uploads\/2025\/04\/5a3eef9275d4180016334d7912421a8e.png 606w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<h2 class=\"\">Realizing the Missing .env File<\/h2>\n<p class=\"\">While referring to information on GitHub (<a class=\"\" href=\"https:\/\/github.com\/koel\/docker\/issues\/180\" target=\"_new\" rel=\"noopener\" start=\"629\" end=\"687\">this issue<\/a>), the absence of the .env file was pointed out as a potential cause.<br \/><strong>Solution:<\/strong><\/p>\n<ul>\n<li class=\"\">\n<p class=\"\">Configured the host&#8217;s .env file to be mapped to <code>\/var\/www\/html\/.env<\/code> inside the Docker container.<br \/>Example: <code>.env:\/var\/www\/html\/.env<\/code><br \/>This configuration reflected the environment variables, allowing the application side to reference the correct configuration file.<\/p>\n<\/li>\n<\/ul>\n<h2 class=\"\">Koel Initialization Failure and Database Migration Error<\/h2>\n<p class=\"\">After addressing the .env file, I entered the container and ran Koel&#8217;s initialization command:<\/p>\n<pre># docker exec --user www-data -it koel bash\nwww-data@e48566cd2562:~\/html$ php artisan koel:init --no-assets\n************************************\n*     KOEL INSTALLATION WIZARD     *\n************************************\n\nAs a reminder, you can always install\/upgrade manually following the guide at https:\/\/docs.koel.dev\n\n  Clearing caches ........................................................................................................................ 40ms DONE\n  .env file exists -- skipping ................................................................................................................ DONE\n  Generating app key ...................................................................................................................... 7ms DONE\n  Using app key: base64:2XQMjmcpY.. ........................................................................................................... DONE\n  Migrating database .................................................................................................................   263ms FAIL\n\n   ERROR  Oops! Koel installation or upgrade didn't finish successfully.\n\n   ERROR  Please check the error log at storage\/logs\/laravel.log and try again.\n\n   ERROR  For further troubleshooting, visit https:\/\/docs.koel.dev\/troubleshooting.\n\n   ERROR  \ud83d\ude25 Sorry for this. You deserve better.<\/pre>\n<p class=\"\">However, it failed at the &quot;Migrating database&quot; stage. At this point, some error occurred during the migration process, and the database was not set up correctly.<\/p>\n<h2 class=\"\">Volume Mapping and Ownership Permission Issues<\/h2>\n<p class=\"\">Further investigation led me to another GitHub issue (<a class=\"\" href=\"https:\/\/github.com\/koel\/koel\/issues\/1792\" target=\"_new\" rel=\"noopener\">here<\/a>), which reported that when mapping host volumes into a Docker container, file and directory ownership permissions are sometimes not set correctly.<br \/><strong>Solution:<\/strong><\/p>\n<ul>\n<li class=\"\">\n<p class=\"\">Changed the permissions of the mapped directories to the appropriate user (in this case, the www-data user and www-data group inside the container, both with ID 33).<\/p>\n<pre>chown -R 33:33 \/path\/to\/koel\/directory<\/pre>\n<\/li>\n<\/ul>\n<p class=\"\">This allowed Koel to access the files as expected. Running the initialization command again successfully completed the database migration.<\/p>\n<h2 class=\"\">Conclusion<\/h2>\n<p class=\"\">When building Koel with Docker, environment-dependent issues may occur, such as a missing environment configuration file (.env mapping) or owner permission issues caused by volume mapping.<br \/>The key takeaways from this troubleshooting session are:<\/p>\n<ul>\n<li class=\"\">\n<p class=\"\"><strong>Environment Variable Management:<\/strong> Verify the location and mapping settings of the .env file.<\/p>\n<\/li>\n<li class=\"\">\n<p class=\"\"><strong>File Permissions:<\/strong> Pay attention to ownership when mapping volumes and apply appropriate permission changes.<\/p>\n<\/li>\n<li class=\"\">\n<p class=\"\"><strong>Leveraging Logs:<\/strong> Identify the cause based on error messages and logs, and utilize external information and community knowledge.<\/p>\n<\/li>\n<\/ul>\n<p class=\"\">Keeping these points in mind, I want to continue taking on the challenge of building applications in Docker environments. I learned that when facing similar problems, it is important to stay calm and eliminate potential causes one by one.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this post, I will share the troubleshooting steps I went through when building a music server using the Koe [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":1277,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"https:\/\/donguri3.net\/?p=1274","footnotes":""},"categories":[1171],"tags":[18,51,52,10,381],"class_list":["post-5042","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-virtualization-container-wsl","tag-docker","tag-git","tag-https","tag-server","tag-381","en-US"],"_links":{"self":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/comments?post=5042"}],"version-history":[{"count":1,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5042\/revisions"}],"predecessor-version":[{"id":5045,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/posts\/5042\/revisions\/5045"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/media\/1277"}],"wp:attachment":[{"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/media?parent=5042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/categories?post=5042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/donguri3.net\/wp-json\/wp\/v2\/tags?post=5042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}