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Fixing Persistent Data Store Issues with Solr in a Docker Container

Learn how to solve the problem of running Solr in a Docker container with persistent data store issues. Follow our step-by-step guide to get your Solr backend working smoothly. --- This video is based on the question https://stackoverflow.com/q/75581502/ asked by the user 'theo' ( https://stackoverflow.com/u/21297704/ ) and on the answer https://stackoverflow.com/a/75585015/ provided by the user 'MatsLindh' ( https://stackoverflow.com/u/137650/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Solr in Docker container unable to work with persistent data store Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Troubleshooting Solr in Docker: Fixing Persistent Data Store Issues Setting up Solr with a Flask frontend using Docker can be a challenge, especially when you're trying to maintain persistent data storage. If you’ve encountered errors related to the data directory not being found, you’re not alone. In this post, we’ll walk you through the common pitfalls and how to resolve them effectively. Understanding the Problem You might be facing an error similar to this when you attempt to spin up your Docker containers using docker-compose: [[See Video to Reveal this Text or Code Snippet]] Cause of the Issue: The error isn't stemming from the absence of the /var/solr directory itself, but rather because the specific data directory inside it doesn’t exist. This is a common case when mounting a host directory, such as ./data, to the container. Key Insights: The mounted directory ./data creates the directory structure on your host but doesn’t automatically create subdirectories in the container. Permissions issues might not be at play if you've already set the ownership correctly. Solution Overview To solve the problem, you need to create the required data directory inside the /var/solr directory within your Solr container. This allows Solr to create and manage its cores without throwing errors. Here’s how you can do that step by step. Step-by-Step Fix 1. Modify Your docker-compose.yml In your docker-compose.yml, make sure you include the directory creation for Solr's cores. Here is the updated relevant section of the file: [[See Video to Reveal this Text or Code Snippet]] Breakdown of Changes Volume Change: Note that ./data:/var/solr/data ensures that the directory data in your Solr container maps to the ./data on your host. Create Data Directory: The command mkdir -p /var/solr/data ensures that the directory structure exists before Solr tries to create the cores. 2. Bring Up Your Docker Containers Once you have adjusted your docker-compose.yml, it’s time to launch your containers again. Run the following command: [[See Video to Reveal this Text or Code Snippet]] Expected Result This time, you should see successful execution messages rather than errors, and your ./data directory should start populating with the necessary Solr core files. 3. Verify Your Setup You can verify that everything is working properly by navigating to http://localhost:8983/solr/# /~cores in your web browser. From here, you should see the cores you created (stable, unstable, archive) listed and accessible. Final Thoughts Setting up Solr in Docker may seem daunting at first, especially when dealing with persistent storage and directory structures. But by ensuring that the necessary directories exist before attempting to create your cores, you can avoid common pitfalls. Key Takeaways: Always make sure the required directory structure is in place within your containers. Double-check volume mappings in your docker-compose.yml for reliability. Testing your setup after each change ensures you can quickly catch any issues. With these fixes, you should have a smooth-running Solr setup in your Docker environment. Happy coding!