If you are seeing the error "WARNING! Your cache is running out of filedescriptors" when using Squid, it means that the proxy is running low on available file descriptors and may be unable to handle new connections.
File descriptors are a limited system resource that are used to represent open files and sockets. When the number of file descriptors in use by Squid exceeds the maximum allowed, this error will occur.
To resolve this issue, you can try the following:
Increase the maximum number of file descriptors allowed by Squid. You can do this by editing the "maximum_object_size_in_memory" parameter in the Squid configuration file and then restarting the proxy.
Check for idle connections that are not being closed properly and terminate them. You can do this using the "squidclient" command with the "mgr:info" action.
Optimize your application's connection pooling and connection management to ensure that connections are being opened and closed efficiently.
If you are using a connection pooling library, try increasing the size of the connection pool to allow more connections to be made simultaneously.
If the problem persists, you may need to scale up your hardware resources (e.g., by adding more CPU or memory) to support the increased load on the proxy.
It's worth noting that the number of file descriptors required by Squid can be affected by factors such as the size of the cache and the number of concurrent connections. You should carefully consider the appropriate values for these parameters based on your specific needs and the resources available on your server.