In terms of raw numbers, Apache is the most popular web server in existence and is used by Nginx comes in a close second at Netcraft ran a survey across million domains and found Apache usage at Web server developers: market share of domains Image source: Netcraft.
While Apache is the most popular overall option, Nginx is actually the most popular web server among high-traffic websites. It powers:. Check out our more in-depth comparison of Nginx vs Apache. Or you can check headers in a tool like Pingdom or GTmetrix.
However, the HTTP header might not always reveal the underlying web server. For example, if your WordPress site is behind a proxy service such as Cloudflare, the server HTTP header will then say cloudflare instead. All of that and much more, in one plan with no long-term contracts, assisted migrations, and a day-money-back-guarantee. Reverse proxy implementation in nginx includes in-band or passive server health checks.
If the response from a particular server fails with an error, nginx will mark this server as failed, and will try to avoid selecting this server for subsequent inbound requests for a while.
When it is set to 0, health checks are disabled for this server. If the probes have been successful, the server is marked as a live one. In addition, there are more directives and parameters that control server load balancing in nginx, e.
For more information please check our reference documentation. Last but not least, application load balancing , application health checks , activity monitoring and on-the-fly reconfiguration of server groups are available as part of our paid NGINX Plus subscriptions. Learn 97 site reliability tips and best practices in this new O'Reilly ebook.
Download for free at nginx. Using nginx as HTTP load balancer Load balancing methods Default load balancing configuration Least connected load balancing Session persistence Weighted load balancing Health checks Further reading Introduction Load balancing across multiple application instances is a commonly used technique for optimizing resource utilization, maximizing throughput, reducing latency, and ensuring fault-tolerant configurations.
The default configuration file already includes several examples of the server block, mostly commented out. For now comment out all such blocks and start a new server block:. Generally, the configuration file may include several server blocks distinguished by ports on which they listen to and by server names.
If there are several matching location blocks nginx selects the one with the longest prefix. The location block above provides the shortest prefix, of length one, and so only if all other location blocks fail to provide a match, this block will be used.
If such file does not exist, nginx will send a response indicating the error. One of the frequent uses of nginx is setting it up as a proxy server, which means a server that receives requests, passes them to the proxied servers, retrieves responses from them, and sends them to the clients.
We will configure a basic proxy server, which serves requests of images with files from the local directory and sends all other requests to a proxied server. In this example, both servers will be defined on a single nginx instance. Create this directory and put the index. Note that the root directive is placed in the server context. Such root directive is used when the location block selected for serving a request does not include its own root directive.
Next, use the server configuration from the previous section and modify it to make it a proxy server configuration. The modified location block looks like this:. The parameter is a regular expression matching all URIs ending with. When nginx selects a location block to serve a request it first checks location directives that specify prefixes, remembering location with the longest prefix, and then checks regular expressions.
If there is a match with a regular expression, nginx picks this location or, otherwise, it picks the one remembered earlier. This server will filter requests ending with. To apply new configuration, send the reload signal to nginx as described in the previous sections. There are many more directives that may be used to further configure a proxy connection.
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