![docker for mac network sluggishness docker for mac network sluggishness](https://i.pinimg.com/236x/fd/60/1a/fd601a73c21491d1f21c91654c40784e--output-device.jpg)
![docker for mac network sluggishness docker for mac network sluggishness](https://images-na.ssl-images-amazon.com/images/I/61qUdfzYykL._SX371_BO1,204,203,200_.jpg)
When this number is exceeded, the least recently used connections are closed. Use the keepalive directive to enable keepalive connections from NGINX Plus to upstream servers, defining the maximum number of idle keepalive connections to upstream servers that are preserved in the cache of each worker process.
#Docker for mac network sluggishness how to
The Overcoming Ephemeral Port Exhaustion in NGINX and NGINX Plus blog post describes how to make NGINX reuse previously established TCP connections to upstreams :Ī keepalive connection is held open after the client reads the response, so it can be reused for subsequent requests. These connections are held open until either the client or the server decides they are no longer needed, generally as a result of an idle timeout. Clients generally open a number of simultaneous TCP connections to a server and conduct keepalive transactions across them all. If the client needs to conduct another HTTP transaction, it can use the idle keepalive connection rather than creating a new TCP connection. HTTP uses a mechanism called keepalive connections to hold open the TCP connection between the client and the server after an HTTP transaction has completed. The HTTP Keepalive Connections and Web Performance blog post covers a variety of topics related to the internals of the TCP protocol, as well as a number of common problems, and how to troubleshoot them – including a useful definition of keepalive connections: (In fact, because keepalives can so greatly reduce the performance penalty otherwise incurred when using SSL/TLS, the extensive use and reuse of keepalives can make the difference as to whether SSL/TLS use is practical or impractical on a website.)
![docker for mac network sluggishness docker for mac network sluggishness](https://www.megatechnews.com/wp-content/uploads/2011/11/uebo-19-500x281.jpg)
The performance boost from using keepalives is increased when SSL/TLS is in use, as SSL/TLS connections are even more expensive than insecure connections. Keepalive connections can significantly boost performance, but only if they’re reused extensively enough to sharply reduce the need to create new connections, which are computationally expensive to set up. Using NGINX Amplify, we can easily visualize the interaction, identify bottlenecks, and troubleshoot excessive TCP connect time, improving application performance. Using the NGINX upstream keepalive mechanism reduces connection overhead by reducing the number of TCP/IP packet round trips, and also gives more consistent response time. The primary focus is measuring the effect on performance of keepalive connections.Īs you’ll see at the conclusion, we found that we can double performance in a realistic testing scenario by using TCP keepalive connections. In this article I’m sharing an example of how to use NGINX Amplify as a visualization and reporting tool for benchmarking application performance.