load-balancing | 易学教程

Selective Cache clearing across load balanced servers (ASP.Net)

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问题 We have a website that runs on two load balanced servers. We use the ASP.Net caching to help improve performance by caching high usage data. BUT, occasionally that data changes. When it does, we need to clear the relevant cache items on BOTH the load balanced servers. Does anyone have some easy to implement suggestions for how this can be done? I know that there is software out there to manage this for you (Microsoft Velocity for one). I also know that there are other options for having

Nhibernate 2nd level caching issues / questions when moving from a single web server to a multiple web server load balanced environment

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问题 My previous setup was a single web server and a single database server. I was using nhibernate 2nd level caching to cache stuff to avoid lots of calls going to the database. This has worked great as i was using this this assembly nhibernate.caches.syscache and added this code to turn on the second level caching (using the regular syscache provider): return configuration .Mappings(m => m.FluentMappings.AddFromAssemblyOf<ApplicationMap>().Conventions.Add(typeof(Conventions)))

Nginx proxy buffering - changing buffer's number vs size ?

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问题 I was wondering and trying to figure out how these two settings: proxy_buffers [number] [size]; may affect (improve / degrade) proxy server performance, and whether to change buffers' size, or the number, or both...? In my particular case, we're talking about a system serving dynamically generated binary files, that may vary in size (~60 - 200kB). Nginx serves as a load-balancer in front of 2 Tomcats that act as generators. I saw in Nginx's error.log that with default buffers' size setting

Good Reading on ASP.NET in Network-Load Balancing Environment

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问题 What are some good web pages to read to become familiar with the ins and outs of creating asp.net web applications in an environment implementing Network-Load Balancing? 回答1: Try to use no Session State as this will have to be available on all WFE Servers, or configure it so it will use an out of process provider, like SQL Take a look here: http://msdn.microsoft.com/en-us/library/ms178581.aspx and http://msdn.microsoft.com/en-us/library/ms178581.aspx 来源： https://stackoverflow.com/questions

What is the difference between HTTPS Load-Balancer w/ non-TLS backend and HTTPS Load-Balancer w/ TLS backend

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I'm trying to configure load balancer to serve in HTTPS with certificates provide by Lets Encrypt , even though I couldn't do it yet, reading this article gives steps how to configure Self-signed certs Network Load-Balancer w/ TLS backend HTTPS Load-Balancer w/ non-TLS backend HTTPS Load-Balancer w/ TLS backend As I'm intersting only in HTTPS, I wonder what is the difference between this two: HTTPS Load-Balancer w/ non-TLS backend HTTPS Load-Balancer w/ TLS backend But I meant not the obvious reason that is the first one is not encrypted from load balancer to backend, I mean in performance and

Http session couldn't hold in Tomcat and nginx proxypass using Spring mvc

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问题 I am using Tomcat 7 and using nginx 1.5.7 as a load-balancer(on Windows 8). I configurated nginx server like this. server { listen 80; server_name www.something.com something.com; location / { proxy_pass http://127.0.0.1:8080/webapp/; } } Also I redirect in my "hosts" file: 127.0.0.1 www.something.com But after login or any session operation via post, there is no session holding in my webapp, It is behaving like no session parameters. By the way i tried to add in web.xml file <session-config>

Tomcat 7 Load Balancing

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问题 Looking to implement Load balancing for two Tomcat 7 instances each on a different machine & two other Tomcat 7 instances on a different machine serving two different purpose. On Machine 1, will have two Tomcat instances TomA.1 & TomB.1 running on different ports On Machine2, will have two Tomcat instances TomA.2 & TomB.2 running on different ports Now TomA.1 & TomA.2 needs to be run in LoadBalanced fashion & similarily TomB.1 & TomB.2 needs to be run in LoadBalanced fashion. Would highly

How to get permanent ip address of a kubernetes load balancer service on AWS?

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问题 How can I publish a service in an AWS kubernetes cluster at a permanent IP address, so that I can add a DNS record? I define service xxx of type LoadBalancer in kubernetes, and kubectl describe service xxx gives me something like: LoadBalancer Ingress: aae55ce563ca611e692c10a83aef9ddc-467886677.eu-west-1.elb.amazonaws.com Port: <unset> 9004/TCP Indeed, I can access the application on aae55ce563ca611e692c10a83aef9ddc-467886677.eu-west-1.elb.amazonaws.com:9004. How can I make this a permanent

How to make meteor get code from one server with load balancer

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问题 I'm running nginx load balancer for meteor application. My app occasionally run into reload loop and does not terminate. I take some debug screenshots here: https://drive.google.com/#folders/0B0ayFgn4x5Sccjd1QTdYdDNkNXc In reload_route_cookies.png (see below), client side shows multiple cookie routes. How do I make sure that my app only loads code from one server? 回答1: I found that telling nginx sticky session path=/ will fix the issue. upstream vida_node_server { sticky path=/; # ... } 来源：

How to associate properties to socket.io object in Redis Store?

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问题 I am working on a complex game with Nodejs and Socket.io, where I need to store socket.io objects in the memory and also assign properties to the socket object ( say a name , a counter of some action from the socket , etc ) In the code below, I have shown an example of what I am trying to achieve. I store all the sockets in an array and also have another array which stores the name property of the socket. At any time if I get a request for the name, I can just pick the name from the array in