Haproxy for windows
Docker Swarm enables us to easily scale up and down our servers with containers, but how do we take advantage of all of our containers? Preferably we would want to spread out the load across the multiple containers.
With a HAProxy this becomes possible. In this article, we are going to look at how we can use a HAProxy to do the load balancing across our containers. I created a small web application running on port that can be used in this article and uploaded it to the public docker hub, but you are free to use any image but you will have to make to make adjustments with the port configurations. I am running Docker version You can probably run an earlier version but that might require you to edit the docker-compose file slightly for compatability reasons.
Docker Swarm actually has load balancing in swarm mode with replicas. With DNS round-robin if a client or server attempts to connect to a failed docker host, they have to retry against another DNS entry.
Additionally, a HAProxy, lets us set up more advanced rules for routing traffic. We are using the HAProxy provided by the docker cloud since it fits our use case very well and I wrote some comments in the docker-compose file to explain the configuration.
Open a terminal and navigate to your docker-compose. Start out by initializing a swarm and deploying our stack. This deploys our stack with the name haproxy, let it boot up for a couple of seconds issue the command: docker ps. You should now have 3 app services, and the HAProxy running. The name object is the unique identifier of the app service, and if you continue to send the same request you should see that a different ID shows up.
If that works, that means that you have successfully set up load balancing to your containers using a HAProxy. Thanks to Docker Swarm, it is now incredibly easy to scale up and down, and we do not need to worry anymore about the load balancing since the HAProxy will react to new nodes being added or nodes disappearing. We have learned how we can use a HAProxy in Docker Swarm with docker-compose to easily scale up and down our services and have it load balanced.
This is, of course, quite a simple example and there is a lot more cool stuff what you can do with both Docker and a HAProxy. But once you have it up and running it is a lot easier to experiment by yourself. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email.
Why do we need a HAProxy in Swarm mode? But you are free to swap this for any image that you'd like. Just remember to change the ports configuration. We do not need to expose it as all the requests will go through the load balancer instead.
We can scale this up and down after as we would like. For example, if you are running something else on 80, you probably don't want to expose the HAProxy on 80 as well. Starting our docker swarm Open a terminal and navigate to your docker-compose.
Final words We have learned how we can use a HAProxy in Docker Swarm with docker-compose to easily scale up and down our services and have it load balanced. Like this: Like Loading Related posts you may be interested in. Leave a Reply Cancel reply Your email address will not be published. Previous Previous post: Apache Kafka Introduction. Sorry, your blog cannot share posts by email.Hi, I'm trying to setup nginx to be a reverse proxy and load balancer for our IIS servers.
Everything seems to work fine except when a page on the IIS server requires authentication. Currently what happens is I'm continually prompted to authenticate and never gain access to the requested content. Is it possible for nginx to do this and if so could someone provide a example config? Thanks, Jonathan Reply Quote. Hi Jonathan. Did you receive some answer about above question?
I have same authentication problem with other applications. No I never did receive an answer or find the appropriate information. I have since started messing around with Pound, using it's ability to filter URL's with RE to direct certain requests to the nginx servers and certain requests to the IIS servers. Reply Quote. I know this is not an HAproxy forum however this is just incase somone else has the same issue.
To solve this problem you need to use "mode tcp" using HAProxy. Newer Topic Older Topic. Print View RSS. Sorry, only registered users may post in this forum.
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It only takes a minute to sign up. I want to load balance a bunch of VMs, but don't have any Linux boxes available.
Typically, afaik, it's done with HAProxy on Linux. You could use Microsoft Network Load Balancing. Another option is to use ISA server infront of it but that comes with another set of issues i. Sign up to join this community.Introduction to HAProxy Load Balancer with demo
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Similar to Nginx, it uses a single-process, event-driven model. This uses a low and stable amount of memory, enabling HAProxy to handle a large number of concurrent requests. Setting it up is pretty easy as well!
This is just for example - in reality, you'll likely see HAProxy used to distribute requests across other "real" web servers, such as Nginx or Apache. I try to give examples that are as good for production as they are for examples, but in this case, it's not overly important - from HAProxy's stand-point, a web server, is a web server, is a web server.
In a more "real" setup, web servers such as Apache or Nginx will stand between HAProxy and a web application. These web servers will typically either respond with static files or proxy requests they receive off to a Node, PHP, Ruby, Python, Go, Java or other dynamic application that might be in place. In this example, setting up three NodeJS web servers is just a convenient way to show load balancing between three web servers.
Read up on how your application might be affected by using a Load Balancer here. We'll install the latest HAProxy 1. If you're missing the add-apt-repository command on Ubuntu This is different from previous Ubuntu's, who used the python-software-properties package to install add-apt-repository.
Now that HAProxy is installed, we need a few web servers to load balance between. To keep this example simple, we'll use a previously mentioned NodeJS application, which just opens up three HTTP listeners on separate ports:. We'll bounce between these three web servers with HAProxy. Here's what we'll likely see by default:. Here we have some global configuration, and then some defaults which we can override as needed for each server setup.
Within the global sectionwe likely won't need to make any changes. Furthermore, the master process is run as root - that process then uses chroot to separate HAProxy from other system areas, almost like running with its own container.Delivered on time, for once, proving that our new development process works better.
In short this provides hot-update of certificates, FastCGI to backends, better performance, more debugging capabilities and some extra goodies. Please check the announce here for more details. October 18th, : HAProxyConf - Limited number of tickets still available We are now less than one month away from our inaugural user conference in Amsterdam on November Discounted hotel rooms are still available through the conference website until October 28th.
The conference passes and hotel rooms are selling quickly, make sure you get yours on time if you want to benefit from the discounts and get a room close enough to the event and other participants. June 21th, : Call for papers slightly extended Older news It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms.
Since it does not advertise itself, we only know it's used when the admins report it :- Its mode of operation makes its integration into existing architectures very easy and riskless, while still offering the possibility not to expose fragile web servers to the net, such as below : We always support at least two active versions in parallel and an extra old one in critical fixes mode only.
The currently supported versions are : version 2. Main features Each version brought its set of features on top of the previous one. Upwards compatibility is a very important aspect of HAProxy, and even version 1. Version 1. The most differenciating features of each version are listed below : version 1. It is not maintained anymore, as most of its users have switched to 1. Users should upgrade to 1. This requires haproxy version newer than 1. Fast data transfers are made possible on Linux 3.
Forwarding rates of up to 40 Gbps have already been achieved on such platforms after a very careful tuning. While Solaris and AIX are supported, they should not be used if extreme performance is required.
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. It does not appear that there is a similar question to this already posted, so I will go ahead and ask. I am working on a project that could benefit from having two - four servers handling incoming requests to a backend webservice.
The service does not require SSL but does need to support occassional long running processes upto secs. This project does not at present have the funding to purchase a hardware load balancing solution. I have previously used HAProxy as a solution for this, and found it very simple and straightforward.
Is there a similar product for windows server or which provides similar configuration options and runs as a lightweight service? For reasons outside my control I cannot setup a Linux machine physical or virtual and so I am looking for behaviour that can be deployed on a windows machine. I can only find Perlbal which appears to fall into this category. So as not to keep this open indifenitely I will give credit to the only answer.
Maybe Perlbal? This is a Perl-based load balancing solution. I have not worked with it myself but I've seen it referenced often and, since it's written in Perl, there's some chance it will work. Google suggests that Windows server already has a built-in network load balancing service, as discussed here and here.
Be careful, I've got very negative reports from people running Windows LB, which was the main reason why they switched to haproxy. If you're satisfied with haproxy, you can build it on windows using the cygwin suite. I have not tested it myself, but the user who performed the port did. He also told me that there was a limit to approximately concurrent connections per process under windows, which may or may not be enough for you.
How to Manage HAProxy servers from a Web Interface
From my understanding, the build should be as straightforward as on linux : "make". If you need more info from this user, I invite you to send a call on the haproxy mailing list. Alternatively, there are certainly people here on serverfault who can help with setting up a cygwin build environment.
Please use version 1.In general when you are load balancing a cluster you can evenly spread the connections through the cluster and you get pretty consistent and even load balancing. This in turn could result in slow performance for other users on the same server. The solution to this problem is to use some kind of server load feedback agent.
The Loadbalancer. Our Windows feedback agent has recently undergone a complete rewrite in a language called GO. We felt that our previous implementation of the feedback agent was feeling a bit dated, requiring an older version of the. With this new version, the agent technically allows for cross-platform compatibility, improves performance as GO is a compiled language, and lastly is so much easier to support.
A more detailed explanation of the benefits and setbacks of getting thus far will be explained in a future blog. It is also worth mentioning that with this release we added a new feature that allows for you to specify the port in the feedback agent config.
Our GO feedback agent is open source and can be found on Github here.
HAProxy Load Balancing Docker Swarm
The previous agent is still available on Github here. Please remove any previous version of the feedback agent before installing version 4. Furthermore, you will need to install. Simply hit the 'start' button and the agent should start responding to telnet on port you may need to make an exception for that port in your Windows firewall. Then on the Windows server client: You can change the 'mode' setting to drain then 'apply settings and restart' and HAProxy will then set the weight to 0 and status to drain blue i.
Otherwise to calculate the percentage idle reported by the agent would be to divide the utilization by the number of factors involved i. Also the final section TCPService effectively lets you load balance on number of established connections to your server, so you could balance based on the number of RDP connections to port In the following screen shot from a Loadbalancer. Malcolm is the founder of Loadbalancer. He has a tendency to talk way too much and play devils advocate in any conversation.
The latest insights from the load balancing experts Loadbalancer.
Reverse Proxy to IIS with Basic & Windows Authentication
How do I install the feedback agent on Windows? Then make sure you modify your virtual server on the load balancer to poll the feedback agent: Then on the Windows server client: You can change the 'mode' setting to drain then 'apply settings and restart' and HAProxy will then set the weight to 0 and status to drain blue i.
And if the importance is zero then ignore completely i.