Troubleshooting Error 54113 on Your Varnish Cache Server A Quick Fix Guide

Troubleshooting Error 54113 on Your Varnish Cache Server: A Quick Fix Guide

Varnish Cache is a powerful tool used by websites to accelerate content delivery by caching HTTP responses. However, like any software, it’s not immune to errors. One such error that Varnish administrators may encounter is Error 54113. This error can disrupt the caching process and affect website performance. In this guide, we’ll delve into the causes of Error 54113 and provide a quick fix guide to resolve it effectively.

Understanding Error 54113Understanding Error 54113

Error 54113 in Varnish Cache typically occurs when the server encounters difficulties in allocating memory for cache storage. This error code is accompanied by a message such as “Could not allocate storage” or “Out of space in storage backend.” Several factors can trigger this error, including:

1. Insufficient memory allocation: If the Varnish Cache server is configured with inadequate memory resources, it may struggle to allocate space for caching, leading to Error 54113.

2. High traffic volume: A sudden spike in website traffic can overwhelm the cache server and exhaust available storage space, triggering the error.

3. Misconfiguration: Incorrect settings or parameters in the Varnish configuration file (vcl) can also contribute to storage allocation issues and result in Error 54113.

4. Storage backend issues: Problems with the storage backend, such as disk space limitations or disk I/O bottlenecks, can prevent Varnish from allocating storage space efficiently, leading to errors.

Now, let’s explore the steps to troubleshoot and fix Error 54113 on your Varnish Cache server:

1. Check Memory Allocation

First and foremost, ensure that your Varnish Cache server is allocated with sufficient memory resources to handle caching operations effectively. Review the server’s memory configuration settings and adjust them as necessary to accommodate the caching requirements based on your website’s traffic volume.

2. Monitor Traffic Patterns

Keep a close eye on your website’s traffic patterns using monitoring tools or Varnish logs. Look for any sudden spikes or fluctuations in traffic volume that may coincide with the occurrence of Error 54113. Adjust your caching strategy accordingly to optimize resource utilization and mitigate the risk of storage allocation issues.

3. Review VCL Configuration

Inspect your Varnish configuration file (vcl) for any misconfigurations or discrepancies that may be contributing to storage allocation problems. Pay special attention to parameters related to cache storage, such as storage size limits, storage backend settings, and storage allocation policies. Make necessary adjustments to optimize cache storage utilization and prevent errors.

4. Increase Storage Capacity

If your Varnish Cache server is consistently running out of storage space, consider increasing the storage capacity or implementing a more scalable storage solution. This may involve upgrading hardware components, such as adding more RAM or disk space, or migrating to a distributed caching architecture to distribute the storage load more efficiently.

5. Optimize Storage Backend Performance

Ensure that your storage backend, whether it’s a disk-based storage solution or a cloud storage service, is configured and optimized for optimal performance. Address any disk space limitations, disk I/O bottlenecks, or network latency issues that may be impeding storage allocation and caching operations.

6. Implement Cache Purging Mechanisms

Implement cache purging mechanisms to periodically purge stale or expired cache entries and reclaim storage space. This helps prevent storage depletion and ensures efficient utilization of cache storage resources. Consider implementing cache invalidation strategies based on TTL (time-to-live) or cache invalidation commands to automate the cache purging process.


Error 54113 on your Varnish Cache server can be a hindrance to efficient content delivery and website performance. However, by following the troubleshooting steps outlined in this guide, you can quickly identify the root causes of the error and implement effective solutions to resolve it. By optimizing memory allocation, monitoring traffic patterns, reviewing VCL configuration, and optimizing storage backend performance, you can mitigate the risk of storage allocation issues and ensure smooth caching operations on your Varnish Cache server.

Antonia Zivcic

I'm Antonia, a copywriter with over five years of experience in the industry. I find joy in exploring a wide array of topics through my writing. It's my passion to create engaging and compelling content that resonates with readers.

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