Hello im running a quad core 8GB machine with fast scsi drives with 64bit centos 5. Now on that site i run a site that get about I used to run my site on apache, but because of the insanely high load i decided to move to nginx.
I have setup nginx with php-fpm, and it is running quite good, only when it gets really busy around 25 pageviews per secondi sometimes notice that i have to wait a few seconds before the server sends a response. This only happens when its busy, so i think ive hit some kind of limit in nginx. It is probably possible to resolve this by changing a certain value somewhere.
The server load is always low, around 1. Below i have posted some of the settings i have already modified. Kind regards, Godius Reply Quote. Jim Ohlstein.
I'm guessing that you have php-cgi processes running at all times. That may be more than you need. I would suggest lowering that number to something more manageable as each process is consuming resources.
You'll need to play with it so that you aren't overloading your system with unused php-cgi processes and not getting 's. Is there away for me to see how much nginx is actually using? Reply Quote. There are also Munin plugins for nginx. Newer Topic Older Topic.
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Registered: 10 years ago Posts: 4. Admin Registered: 11 years ago Posts: Get the latest tutorials on SysAdmin and open source topics. Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city. Become an author. Nginx is a fast and lightweight alternative to the sometimes overbearing Apache 2.
However, Nginx just like any kind of server or software must be tuned to help attain optimal performance. A fresh Debian 7 droplet with the intial setup completed.
The droplet must also have a freshly installed and configured Nginx server running.
A good understanding of Linux basics. The first two variables we need to tune are the worker processes and worker connections. Before we jump into each setting, we need to understand what each of these directives control. This directive is responsible for letting our virtual server know how many workers to spawn once it has become bound to the proper IP and port s.
It is common practice to run 1 worker process per core. We can accomplish this by greping out the cpuinfo:. This is why we need to adjust our worker connections to its full potential. On a smaller machine MB droplet this number will probably readwhich is a good starting number. Remember, the amount of clients that can be served can be multiplied by the amount of cores.
Another incredibly important tweak we can make is to the buffer size. If the buffer sizes are too low, then Nginx will have to write to a temporary file causing the disk to read and write constantly. POST actions are typically form submissions. For all intents and purposes, 1K is usually a decent size for this directive. If neither a body or header is sent, the server will issue a error or Request time out.
Simply put, Nginx will close connections with the client after this period of time. Gzip can help reduce the amount of network transfer Nginx deals with. This directive can be added to the actual Nginx server block. Add and remove any of the file types in the array above to match the types of files your Nginx servers.
Nginx logs every request that hits the VPS to a log file. If you use analytics to monitor this, you may want to turn this functionality off.
At the end of the day a properly configured server is one that is monitored and tweaked accordingly. None of the variables above are set in stone and will need to be adjusted to each unique case. Even further down the road, you may be looking to further your machine performance with research in load balancing and horizontal scaling. These are just a few of the many enhancements a good sysadmin can make to a server.
Nginx is one of the most popular web servers in the world and is responsible for hosting some of the largest and highest-traffic sites on the internet.Following the release of the slowhttptest toolI ran benchmark tests of some popular Web servers. My testing shows that all of the observed Web servers and probably others are vulnerable to slow http attacks in their default configurations. Reports generated by the slowhttptest tool illustrate the differences in how the various Web servers handle slow http attacks.
Tests were run against the default, out-of-the-box configurations of the Web servers, which is the best level playing field for comparison. And while most deployments will customize their configuration, they will likely do it for reasons other than improving protection against slow http attacks. In addition to noting that all Web servers tested are vulnerable to slow http attacks, I drew some other generalizations about how different Web servers handle slow http attacks:.
However, there are some interesting differences in the results as well. The screenshots below, which show the graphical output of the slowhttptest tool, demonstrate how connection state changed during the tests, and illustrate how the various Web servers handle slow http attacks.
Apache is generally the most vulnerable, and denial of service can be achieved with connections on the system tested. Apache documentation indicates a second timeout for connections, but my testing indicates this is not enforced.
In the test, the server accepted connections and started processing of them. The rest of the connections were accepted and backlogged. The limit for backlog is set by the ListenBackLog directive and is in default httpd. The connected connections shown in the graph correspond to the being processed plus the in the backlog. I terminated the test after seconds, but the picture would be the same for a longer test. A properly configured client can keep connections open for hours, until the limit for headers count or length is met.
While testing, I noticed that my httpd. The TimeOut directive currently defines the amount of time Apache will wait for three things:. I understand from the above paragraph that the opened connections should be closed after the TimeOut interval, i. However, I observed that the connection is closed only if there is no data arriving for seconds, which means this is not an effective preventative measure against DoS.
As shown in the graph above, the server accepts the connections it can accept, and leaves the rest of the connections pending. Due to some hardcoded timeout values, connections are closed after 70 seconds no matter how slow the data is arriving.
Nginx is very slow
Nginx is therefore safer than default Apache, but it still gives attacker a chance to achieve DoS for 70 seconds. The default TCP timeout 75which closes pending connections, is longer than the nginx timeout 65which closes accepted connections. This means that nginx moves some pending connections to the accepted state after it times out the first set of accepted connections.
This extends the length of time that a batch of slow connection requests can tie up the server. In any case, a client can always re-establish connections every 65 seconds to keep the server under DoS conditions.
Lighttpd with default configuration is vulnerable to both http attacks, which are fairly easy to carry out. The default configuration allows a maximum of connections to be accepted, as can be seen in the graph above, with the rest pending for seconds, and then closed by a timeout.
Lighttpd has a useful attribute called server.Nginx is very slow Posted by Nginx Fan. Nginx Fan. Hello, Nginx is very slow on my server According to your log files it looks like you have entered a restrictive value for time outs, could you provide the rest of your nginx. You have far too much worker processes, set the amount of worker processes to the amount of cpu cores your web server runs on. Reply Quote. XCache is installed also with 0. My site has many static files as content, I wonder if setting up second nginx as reverse-proxy serving static content and sending dynamic requests to the first one would help improve the speed.Load Balancing Kubernetes Services with NGINX and NGINX Plus
Edited 3 time s. OK, I've installed stub status module great thing. Edited 1 time s. I can't tell you what the output of the stub status module means, never used it. You don't have create a second nginx server or reverse proxy or something, you can tell your existing server that it should deliver static files directly. I have the same problem too, it even takes more than 15 seconds. I tried the suggestions here but no luck yet.
Nginx + php-fpm Slow Response When Busy
I have the same problem and it is driving me crazy. When I reboot, it works super fast for like 30 - 60 sec, then hude delays I think it must be fast cgi but dont' know where it is going wrong.
These requests then create a long queue, and your requests just get longer and longer. Best I can do, both are terrible solutions, but they seem to work for now. Would be great to get some advice from someone who can dig deeper into the issue Got the same problem The problem was with spawn-fcgi custom build from scratchafter reinstalling it from distribution everything works just fine.
I have the same problem. Still could not solve. Raise the resources there. I have the same problem This is my configFind answers, guides, and tutorials to supercharge your content delivery. Server response time is an important value to track as all website assets are indirectly dependent upon it. If your server response time is slow, then your whole site will be slow, no matter how optimized your other resources are.
According to Google and other speed test toolssuch as GTmetrix, you should aim for a server response time of less than ms. Server response time is the amount of time required to load the HTML document of a website from a server so that the client can begin rendering the page. Without a good server response time, the HTML document will take longer to load. The response time of a server is typically measured with what is known as time to first byte TTFB.
As you run several speed tests, you may see a slight variation in the TTFB number, however, for the most part, it should be more or less consistent. Slight variations can be caused by a variety of factors that affect latency. These include:. In the previous section we discussed things that affect server response times. Learn more about the differences between the aforementioned hosting options in our what is a virtual private server article.
Furthermore, you can also take advantage of a content delivery network to take your caching strategy a step further once your HTML document has been loaded and you need to now load your other static assets.
Not everyone may feel comfortable doing their own web server optimization, however, ensuring that your server is fully optimized will help further reduce your server response time. When it comes to choosing server software, there are a few options available; although most users opt to use either Apache or Nginx.
There are pros and cons to each web server although Nginx has been known to offer better performance in many circumstances. Learn more about the difference between Nginx vs Apache. There are various ways to go about optimizing database performance and it can potentially turn into a large undertaking depending on the current state of your existing database. Doing things like rewriting your queries with performance in mind, changing your schema to group objects and using indexes are a few ways you can optimize database performance.
For a more comprehensive list of suggestions on how to improve database speed check out our complete path to improving database performance. The faster your server response time is, the more likely users will stay on your page for a longer period of timeand the less likely they will bounce as they wait for it to load.
Take the recommendations in the article and implement them into your own site to start improving the response times of your server.
When your website receives thousands of visitors every day, the underlying infrastructure must be able to support the traffic. High traffic means a large number of simultaneous requests from users expecting fast load times.
Delays can cost your…. There are many reasons why your website may be slow. In most of the cases we talk about how to…. Website performance optimization is always something that should be top priority, especially when there is so much online competition. We have written a lot of performance tutorials over the past couple months, such as how to speed up WordPress…. Support Find answers, guides, and tutorials to supercharge your content delivery.
Nginx is configured as a reverse proxy for Solr, when I try to access the Solr UI through nginx, it takes about a minute to load. I checked Chrome dev tools and it looks like the browser is able to download 6 files right off the bat, however then all other requests are in a pending status. Then it just sits there for exactly a minute and after that everything gets downloaded and page loads.
After that, the browsing is fast; I think this is mainly because of local browser cache. Now this is not a problem on my dev server, which runs the same config and should be configured relatively similar, so it could be something system related, but I am not sure. It looks like the issue is me pointing to back end hosts by IP vs hostname.
I am not sure why this is an issue. I've implemented this config:. If I go through it works fine, however if I hit through the performance problem described above occurs. Does anyone have any ideas? See the official docs for details:. When buffering is disabled, the response is passed to a client synchronously, immediately as it is received. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
Asked 4 years, 9 months ago. Active 1 year, 5 months ago. Viewed 27k times. Any help would be much appreciated. IS this of any help serverfault. Use host names instead of ips, in upstream sections.
I seem to have the exact reverse issue in that it is the hostname that causes the one minute wait and the ips that work "fast". Active Oldest Votes. Anatoly Anatoly 2 2 silver badges 13 13 bronze badges. Try replacing proxy. Tashfeen Tashfeen 1.
I'm developing a facebook canvas application and I want to load-test it. I'm using jmeter to load-test the application and the simulation is working ok. Now I want to simulate slow graph api responses and see how they affect my application. How can I configure nginx so that it inserts a delay to each request sent to the simulated graph. You can slow the speed of localhost network by adding delay.
Use ifconfig command to see network device: on localhost it may be lo and on LAN its eth0. My earlier answer works but it is more adapted to a case where all requests need to be slowed down. I've since had to come up with a solution that would allow me to turn on the rate limit only on a case-by-case basis, and came up with the following configuration.
Make sure to read the entire answer before you use this, because there are important nuances to know. Important note: the presence or absence of forward slashes in the various paths makes a difference. The principle of operation is simple. So in my test suite, when I want a network slowdown, I create the file, and when I want to remove the slowdown, I remove it. And I have cleanup code that removes it between each test. In theory I'd much prefer using variables for this than a file, but the problem is that variables are reinitialized with each request.
So we cannot have a location block that would set a variable to turn the limit, and another to turn it off. That's the first thing I tried, and it failed due to the lifetime of variables.
It would probably be possible to use the Perl module or Lua to persist variables or fiddle with cookies, but I've decided not to go down these routes. See this issue for a similar conflict that was resolved by splitting a block.
The documentation is here. I do not believe there is a way to specify a uniform delay using this method. Learn more. Using nginx to simulate slow response time for testing purposes Ask Question. Asked 7 years, 2 months ago. Active 1 year, 1 month ago.
Viewed 8k times. Active Oldest Votes. Unfortunately, tc is only for Linux, but does not appear on OS X. Louis Louis k 25 25 gold badges silver badges bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
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