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  • HTTPS load balancing based on some component of the URL

    - by user38118
    We have an existing application that we wish to split across multiple servers (for example: 1000 users total, 100 users split across 10 servers). Ideally, we'd like to be able relay the HTTPS requests to a particular server based on some component of the URL. For example: Users 1 through 100 go to http://server1.domain.com/ Users 2 through 200 go to http://server2.domain.com/ etc. etc. etc. Where the incoming requests look like this: https://secure.domain.com/user/{integer user # goes here}/path/to/file Does anyone know of an easy way to do this? Pound looks promising... but it doesn't look like it supports routing based on URL like this. Even better would be if it didn't need to be hard-coded- The load balancer could make a separate HTTP request to another server to ask "Hey, what server should I relay to for a request to URL {the URL that was requested goes here}?" and relay to the hostname returned in the HTTP response.

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  • Load balancing a Windows File Share using HA-Proxy

    - by NathanE
    After pulling my hair out over DFS I just had this weird and potentially dangerous idea come into my head whereby, just possibly, I might be able to use HA-Proxy to load balance a file share between servers. I've done some remedial packet traces and it does appear that TCP port 445 is the only thing involved in using Windows file sharing. I've always thought for many years that UDP 139, 135 etc were also involved in at least establishing the connection - but apparently not! So I setup a basic test: listen SMBTest *:445 mode tcp server Smb1 172.16.61.201:445 server Smb2 172.16.61.202:445 And you'll never guess what... it works??? (!) Now obviously there is the whole concern about synchronisation between the file servers (of course). That could easily be taken care of with a little bit of Robocopy script. And considering I only need a HA read-only file share there wouldn't be any issues with regard to file locking etc. Can anyone tell me if what I'm playing with here is fire? I really didn't think it would work at all and now I'm a little shocked. What would be the downsides? Could this be relied upon for a production environment?

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  • Designing a software based load balancer

    - by Kishore pandey
    Hello to all Server fault users, I am new to this website but have constantly been using the mother website, stackover flow. Well to begin with, i would like to design a load balancer for the organization i am working for. As i am very new to this whole, idea about load balancing and networks. I am finding it very difficult to start my project. I did a lot of research on already existing load balancer and found some(HAPROXY,NGINX) that could solve my problems, but the point is, I am still in a dilemma if they could answer the following requirements of mine: The client and server in my architecture are distributed. The load balancer should take care of the firewall. LB server should balance the load among all servers present in WWW cloud. The LB server should have some sort of configuration file, with the help of which it is possible to configure the servers. Heart beat: With the help of which it would be possible to check if any server is down, if any server is down the request should be passed to some other server. Various load balancing algorithms of the incoming requests. Easy error handling. It should be fairly possible to prioritize the incoming requests. Is there any already available load balncer solution on the market that could satisfy these requirements? If not is there any base code available with the help of which i could develop my own load balncer. If not where should i start from scratch? I am practically new to everything. Any help from a load balancer expert is very much appreciated. Thanx a ton in advance. Cheers and regards. Kishore

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  • AWS VPC ELB vs. Custom Load Balancing

    - by CP510
    So I'm wondering if this is a good idea. I have a Amazon AWS VPC setup with a public and private subnets. So I all ready get the Internet Gateway and NAT. I was going to setup all my web servers (Apache2 isntances) and DB servers in the private subnet and use a Load Balancer/Reverse Proxy to pick up requests and send them into the private subnets cluster of servers. My question then, is Amazons ELB's a good use for these, or is it better to setup my own custom instance to handle the public requests and run them through the NAT using nginx or pound? I like the second option just for the sake of having a instance I can log into and check. As well as taking advantage of caching and fail2ban ddos prevention, as well as possibly using fail safes to redirect traffic. But I have no experience with their ELB's, so I thought I'd ask your opinions. Also, if you guys have an opinion on this as well, would using the second option allow me to only have 1 public IP address and be able to route SSH connections through port numbers to respective instances? Thanks in advance!

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  • Requests per second slower when using nginx for load balancing

    - by Ed Eliot
    I've set up nginx as a load balancer that reverse proxies requests to 2 Apache servers. I've benchmarked the setup with ab and am getting approx 35 requests per second with requests distributed between the 2 backend servers (not using ip_hash). What is confusing me is that if I query either of the backend servers directly via ab I get around 50 requests per second. I've experimented with a number of different values in ab the most common being 1000 requests with 100 concurrent connections. Any idea why traffic distributed across 2 servers would result in fewer requests per second than hitting either directly? Additional info: I've experimented with worker_processes values of between 1 and 8, worker_connections between 1024 and 8092 and have also tried keepalive 0 and 65. My main conf currently looks like this: user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; worker_rlimit_nofile 8192; events { worker_connections 2048; use epoll; } http { include /etc/nginx/mime.types; sendfile on; keepalive_timeout 0; tcp_nodelay on; gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } I've got one virtual host (in sites available) that redirects everything under / to 2 backends across a local network.

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  • redundant http load balancer

    - by jrydberg
    Got a simple scenario with two web servers for redundancy and to scale. But how do I make a two web-server setup fully redundant? I can think of two solutions; two web servers, one load balancer spreading the load. one extra machine for the load balancer. but how will the load balancer be redundant? two machines, each running the web server AND running a load balancer, spreading the load over. have a DNS entry point to both of the machines. no extra machines needed for load balancing. How do you guys normally solve this kind of problem?

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  • Do i need a dedicated server for load balancing?

    - by Ben
    I'm completely new to the concept of load balancing so i hope this question isn't a "stupid question" because i've been searching around and im having a hard time understanding this. So to my understanding, in order to load balance, i need a separate machine with an ip address i can direct all traffic to. I initially thought i needed to rent 3 dedicated servers, one for load balancing and the other two as backend servers. Would a dedicated server be too much for a load balancer or do hosting companies have special types of computers for that process? Then i read somewhere else that i can install a load balance software in both of the two servers and configure it in a way that doesn't require me to rent another machine/dedicated server for load balancing. So im a bit confuse on how to actually implement a load balancer and whether or not i need a dedicated server for the sole purpose of acting as a load balancing machine. Also, i was recommended to use HAproxy so i'll be heading that direction for load balancing.

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  • Conceptually how does load-balancing on the EJB tier work in Glassfish/any ejb container

    - by Benju
    I am wondering conceptually how load-balancing works on the EJB-level (not web session replication) with Java EE containers like Glassfish. From what I have gleaned your remote interface is a proxy that delegates your call to one of many servers you may have in an environment. If things fail are they supposed to be able to "finish" on another server? I want to understand the basic theory behind this load balancing, why is it better than a bunch of servers all running a plain web application with session affinity on a load-balancer?

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  • Best Solution for Load Balancing NFS File Access?

    - by DairyKnight
    I'm trying to find an optimum solution for accessing the NFS file share in my company. We have a central file server in North America and has 30GB~50GB of updated data everyday. And it's very slow for our Europe and Asia branches to access directly. Therefore, I'm trying to setup two replicate servers in those continents. I'm currently using rsync, but wonder if there exists a better solution acts more like a distributed RAID, which allows the user to transparently access the file whether synced or not. And user request will be dispatched to remote server if the file is not yet synced. I'm now looking into DRBD, but it seems not to have the functionality of auto-dispatching requests. Does anyone know if there's a better solution?

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  • web application load / stress testing services

    - by Booji Boy
    Can you recommend reputable companies that offer help (consulting services, etc) in load testing (ASP.NET) web applications? We have a client looking to load test an ASP.NET application and we don't have any expertise in load testing web applications. The client is located in central Massachusetts. My employer http://www.goADNET.com was looking for an option besides, “I can figure out how to do it”.

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  • Load Balancing Rails on Apache 2.x

    - by revgum
    My situation is that I need to proxy traffic to the root of my web server to port 81 for IIS, and then any traffic to a sub-directory needs to be directed to the rails app. my-server.com/ - needs to proxy to port 81 my-server.com/myapp - needs to point to the rails app This seems to be working alright for the rails application but the images, javascripts, and stylesheets are not actually working (proxied). I've tried to fiddle with the proxypass lines but it still doesn't work for me..can anyone help? Here's my complete VirtualHost portion of the config; LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_http_module modules/mod_proxy_http.so ProxyRequests off <Proxy balancer://myapp_cluster> BalancerMember http://127.0.0.1:3001 BalancerMember http://127.0.0.1:3002 </Proxy> <VirtualHost *:80> DocumentRoot "c:\ruby\apps\myapp\public" <Directory /myapp > Options FollowSymLinks AllowOverride None </Directory> ProxyPass /myapp/images ! ProxyPass /myapp/stylesheets ! ProxyPass /myapp/javascripts ! ProxyPass /myapp/ balancer://myapp_cluster/ ProxyPassReverse /myapp/ balancer://myapp_cluster/ ProxyPreserveHost on ProxyPass / http://localhost:81/ ErrorLog "c:\ruby\apps\myapp\log\error.log" # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog "c:\ruby\apps\myapp\log\access.log" combined </VirtualHost>

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  • Load balancing with Cisco router

    - by you8301083
    I have a Cisco router with two bonded T1's which are setup as a VPN to the main office. We need more bandwidth but can't get other connections (or it's too costly), so I would like to have a dsl connection installed. This DSL connection will run over a VPN to the same main office, but it won't be bonded with the T1's - so it won't act as a single connection. Since the three circuits won't act as a single connection (basically would be two connections 2 T1's + 1 DSL) we would have to split the network in half - but I don't want to do that. Instead, would it be possible to send all HTTP/HTTPS over the DSL connection but send all mission critical data (such as voice/active directory) over the T1's? I basically want to send specific ports over DSL and everything else over the T1's without separating half of the users traffic over the DSL and the rest over the T1's.

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  • ARR servers in the Load Balancing pool automatically go from unavailable to available

    - by Chris
    I have 3 IIS web servers in an ARR web farm. When we do rolling releases, we take one server offline as a backup server and move it into an "Unavailable State" I have noticed that with ARR, servers will not stay in this state...they come back online automatically hours or days later. Does anyone know how to remedy this situation? This is very bad as the server that is down is typically not running the correct version of our code. I need to keep a server unavailable until i tell it otherwise.

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  • Network load balancing, efficience and limits?

    - by Vimvq1987
    I'm about to study about NLB on Windows Server 2003. It archives both of my interests now: scalability and high-availability. But I don't know about its power in production environment. Is NLB a efficient solution? How does it implement in real-world? Is it popular? What are its limit? Thank you so much for answering my questions. :)

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  • nginx automatic failover load balancing

    - by robinmag
    Hi, I'm using nginx and NginxHttpUpstreamModule for loadbalancing. My config is very simple: upstream lb { server 127.0.0.1:8081; server 127.0.0.1:8082; } server { listen 89; server_name localhost; location / { proxy_pass http://lb; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } But with this config, when one of 2 backend server is down, nginx still routes request to it and it results in timeout half of the time :( Is there any solution to make nginx to automatically route the request to another server when it detects a downed server. Thank you.

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  • Apache Balancing by source IP

    - by Daniel
    I am using Apache's Proxy Balancer to balance one sub domain (e.g. subdomain.domain.com) to an application which is located on 2 servers. Here an extract from my Apache configuration file: <Proxy *> Order deny,allow Allow from all </Proxy> <Proxy balancer://cluster1> BalancerMember http://server1:28081 route=w1 BalancerMember http://server2:28082 route=w2 </Proxy> ProxyPass /path balancer://cluster1/path ProxyPassReverse /path balancer://cluster1/path My question is, if it's possible to decide with the source IP-address which BalancerMember should be used for the request? To e.g. Requests from 1.2.3.4 to Member 1?

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  • Setting up page goals in Analytics when using progressive enhancement to load content using jquery .load

    - by sam
    I'm using jQuery .load to load content in from other pages into my homepage, so that Google can still see whats going on I've made the <a> tags go to the pages but over ride them in the JavaScript so instead of going the that page it just loads in the content from that page to the main page. Normaly I would just make the page /contact.html a goal. Can I still get it to work as a goal if the content is being loaded in? Can I do something like when the user clicks <a href="contact.html" id="load-contact">contact</a> it logs the clicking of the <a> tag as a goal, rather than the actaul page being visited?

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  • Load balance incoming traffic

    - by justin
    Dear All Please I have the following scenario. 3 servers voip / mail / terminal one load balancing router 2 internet connections (static ip`s) My concern is to load balance incoming traffic since the outgoing traffic is being taking care by the load balancing router. For instance all offices connect to the mail server via the internet same for voip and terminal services. The mail and voip clients are set up with one of the static ip`s and the router forwards the request to the appropriate server. But obviously like this there is no fail over nor load balancing cause all requests are being directed to one internet connection. Anyone has a suggestion was thing of a dns server, does this make sens ? or maybe a hosted option ? Thanks Justin

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  • Load SWF data without loading sound, then load sound later

    - by Jon Sandness
    So, hypothetical situation here: I have an SWF that's 30MB. Sound files (music) make up 25MB, art and other things make up the remaining 5MB. Would it be possible for me to load the 5MB of necessary art and other things first to allow the user to operate the app, then after that's all loaded and they are operating the app, load the remaining 25MB of sound files in the background? UPDATE: Loading SWF externally is not an option.

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  • Server load spikes several times a day, load average for the past month is 5 times the load average all year

    - by AMF
    My Munin notifications set up for our (Debian) LAMP cluster have been notifying me continuously that our load on our production machine has been at dangerous levels. While the average load all year typically runs between 2 and 8, the load in the past month and only the past month -- has been skyrocketing to 10, 18, and occasionally even 50-60. The spikes last only 5-10 minutes at a time and occur about every 2-3 hours. The spikes do not effect performance only because I have a script that sends traffic off our server to a mirror CDN when the load goes above 10. I've looked for cron jobs that correlate with this timeframe but there is nothing I can see that would cause this. Site traffic is also normal (we receive about 200K visits per day). I'm also trying to think of anything I've changed around the time this problem began, and I really cannot think of anything. This is probably not much to go on. Maybe there is a clue in the top print-out (below) that I'm not seeing. How do I proceed to find the cause? -- Typical top when the load is NOT spiking: top - 11:13:09 up 472 days, 25 min, 1 user, load average: 6.08, 4.29, 3.80 Tasks: 105 total, 1 running, 104 sleeping, 0 stopped, 0 zombie Cpu(s): 41.2%us, 5.8%sy, 0.0%ni, 49.5%id, 2.7%wa, 0.1%hi, 0.7%si, 0.0%st Mem: 3369592k total, 2166980k used, 1202612k free, 559504k buffers Swap: 2650684k total, 1892k used, 2648792k free, 1129116k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 32046 apache 15 0 36300 12m 9828 S 20 0.4 0:01.97 apache2 32679 apache 15 0 36568 13m 10m S 19 0.4 0:01.69 apache2 31441 apache 15 0 36616 13m 10m S 19 0.4 0:04.13 apache2 31477 apache 15 0 36596 13m 9.8m S 15 0.4 0:01.99 apache2 31993 apache 15 0 36876 16m 12m S 12 0.5 0:02.01 apache2 31782 apache 15 0 36836 14m 10m S 8 0.4 0:02.17 apache2 32198 apache 15 0 36536 13m 10m S 7 0.4 0:01.59 apache2 880 apache 15 0 36508 9708 6236 S 7 0.3 0:00.42 apache2 31945 apache 17 0 36876 16m 13m S 5 0.5 0:03.17 apache2 32197 apache 16 0 36636 10m 7504 S 5 0.3 0:02.70 apache2 32326 apache 15 0 37024 11m 7632 S 5 0.3 0:02.15 apache2 32565 apache 15 0 37280 13m 9.8m S 5 0.4 0:03.75 apache2 32676 apache 15 0 36896 16m 12m S 4 0.5 0:00.95 apache2 32678 apache 15 0 36536 12m 9692 S 4 0.4 0:02.27 apache2 974 apache 16 0 37064 9888 6016 D 4 0.3 0:00.13 apache2 32150 apache 16 0 36832 13m 10m S 3 0.4 0:01.74 apache2 31780 apache 16 0 36848 11m 7660 S 3 0.3 0:02.87 apache2

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  • VSTS 2008 Load testing, Is it any good?

    - by anshu
    I have already spent couple of weeks trying to use this tool to generate some webtest and load test. But every day it throws a weird problem for which I do not find anything in document. examples: Hidden variables (_lastfocus) not found in the context error. Today, all of sudden it is now refusing to run some of the webtest which are part of the test mix in my load test run (is working fine with another load test). Are enterprise level, expensive tools are only good? (like loadrunner, silkperformer etc).

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  • Visual Studio Load Tests Virtual Users Simulation

    - by Eldar
    Hello, I'm currently working on writing a load testing application that takes advantage of Load Test using Visual Studio 2010. The load test will simulate 20 users on the same machine, and I need some data to be shared in-memory between all simulated users. I was suprised I couldn't find documentation answering the following question: What seperates each virtual user's running context from the other? Does each virtual user runs the tests in its own process? Maybe in its own app domain? Or just on its own thread? I need to know because if each user is running tests in its own process then all the in-memory cache isn't shared and is created for each user instead of one time for all of them, which is bad for me.

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  • SQL Server replication and load balance

    - by Ahmed Galal
    I'm running a web service that serves a mobile app on IIS 8 and SQL Server 2014, my service has a massive load and i'm trying to improve performance, most of the load is happening on SQL. i don't think i have a bottleneck, my processor and ram is up to the max and i think my code is not that bad, am already using memcached and other stuff to avoid hitting SQL too much. i know i can always upgrade the server hardware but i already have a spare server that i would like to use, so i was thinking to split the SQL load on the 2 servers. What i was thinking of is to setup replication on the other server and do some load balancing, but am not sure how to do the load balance. I know i can adjust my code to hit the other server for some queries but i was hoping to find a solution that avoid changing my code. So my question is, What are the ways of doing load balancing between 2 SQL servers ? I would appreciate suggestions or best practices or some directions. Thanks.

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  • Load Testing Java Web Application - find TPS / Avg transaction response time

    - by Steve
    I would like to build my own load testing tool in Java with the goal of being able to load test a web application I am building throughout the development cycle. The web application will be receiving server to server HTTP Post requests and I would like to find its starting transaction per second (TPS) capacity along with the avgerage response time. The Post request and response messages will be in XML (I dont' think that's really applicable though :) ). I have written a very simple Java app to send transactions and count how many transactions it was able to send in one second (1000 ms) however I don't think this is the best way to load test. Really what I want is to send any number of transactions at exactly the same time - i.e. 10, 50, 100 etc. Any help would be appreciated! Oh and here is my current test app code: Thread[] t = new Thread[1]; for (int a = 0; a < t.length; a++) { t[a] = new Thread(new MessageLoop()); } startTime = System.currentTimeMillis(); System.out.println(startTime); for (int a = 0; a < t.length; a++) { t[a].start(); } while ((System.currentTimeMillis() - startTime) < 1000 ) { } if ((System.currentTimeMillis() - startTime) > 1000 ) { for (int a = 0; a < t.length; a++) { t[a].interrupt(); } } long endTime = System.currentTimeMillis(); System.out.println(endTime); System.out.println("Total time: " + (endTime - startTime)); System.out.println("Total transactions: " + count); private static class MessageLoop implements Runnable { public void run() { try { //Test Number of transactions while ((System.currentTimeMillis() - startTime) < 1000 ) { // SEND TRANSACTION HERE count++; } } catch (Exception e) { } } }

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  • Load balancing a console application or service

    - by David
    So it's easy to load balance an ASP.NET web application. You set up a load balancer between two servers, and if the web server isn't responding on Port 80, it won't receive requests. Are there any proven techniques for doing this for a C# console application or Windows service that takes actions of its own volition? Are there any frameworks for knowing if peer processes are alive or dead, doing heartbeats, etc? I've been experimenting a bit with NServiceBus and it seems like, for certain kinds of applications, it would help to have most of the work done as a response to an event, which makes it more like a web application, actually, and therefore easier to scale and load balance with multiple processes, but I feel like that's a half-baked solution since in most cases there usually needs to be some concept of a "master" process that's responsible for getting work started.

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