Is HAProxy a good load balancer?

How do I install and use HAProxy?

HAProxy is installed via the HAProxy package in the apt repository.

Simply run the following command to install: sudo apt-get install haproxy. Once it's installed, your default text editor, nano, will have a .conf file as an initial default configuration. We're going to edit this file so that we can start your HAProxy service in daemon mode instead of as a foreground process.

We also need to open up our firewall rules to allow access from a specific source. Sudo ufw default allow proto tcp from xxx.xxx to any port 8080 I use iptables (netfilter) and you can set these rules up there too. There are many tutorials out there online. Check google for them.

We also need to set up an elastic IP. I created a new Elastic IP instance via the Amazon UI as shown below. The instance is in eu-west-1 and the security group does not need to be updated on account for AWS itself. Instead the instance needs to be added to the ELB security group which has already been configured to include all public traffic.

You should now be able to test HAProxy using the browser at. You should see a page which lists status of how many active haproxy nodes there are. If one of your machines becomes unreachable, HAProxy automatically restarts it so that other nodes in the group can continue processing traffic. You may also find you have too many or too few nodes if the machine is not available. It's a bit crude, but you can monitor the health of each of your haproxy nodes via: curl -i.e. This should display a health check banner as well as a 200 OK response and some useful stats. If you get a different 500 error then something serious has gone wrong with your configuration.

For more info on HAProxy see. You can stop running haproxy when you're done testing. You can do this by stopping your HAProxy service with: sudo service haproxy stop. Or using services: That should keep your nodes from listening on the default IP address any more.

Is HAProxy a good load balancer?

I have been using HAProxy in front of my web servers for a while now, and the experience has been pretty good. The first question I would ask is "why? Why are you using a load balancer at all? You may be aware of the fact that a load balancer doesn't actually do anything, it just spreads your incoming requests to multiple servers. If you're trying to achieve a high availability solution, then this is not the load balancer you need. However, if you're just trying to spread the load, then you can use a HAProxy in front of a cluster of servers.

Why I'm asking this question. While HAProxy is quite a great tool, it is also very easy to get stuck in an infinite loop of configuration. For example, you set up the server to accept a single connection, and then configure HAProxy to spread the load across multiple servers. This works fine for a single server. However, if you have more than one server, HAProxy will attempt to balance the incoming connections to each server. This will almost certainly cause an infinite loop of configuration.

So my question is this: If I want to use HAProxy as a load balancer for a cluster of web servers, how do I configure it? I am trying to balance a cluster of web servers to reduce server load. Edit: I thought this was clear, but I guess it wasn't. I'm using HAProxy to spread the incoming connections across a cluster of web servers. I don't want any of the servers to be idle, so I want to keep the server load as low as possible.

To clarify a little more, here is an example of the type of setup I'm looking for: A user connects to server A, and is sent to server B. Server A is busy, so server B receives the request. The user is then sent back to server Server A is free, so it receives the request and sends it to server C. Server C is busy, so the request is sent back to server My idea is that the load should be evenly distributed between the three servers.

Does HAProxy support Windows?

How can I use HAProxy to distribute a web server load and to perform load balancing?

HAProxy has two types of modes: normal, which is for load balancing, and transparent, which is for the same thing but without any network overhead. For Windows, use transparent mode.

From the documentation on Windows: Load balancing using a windows firewall. You need to define each application on a. specific interface in the list, or you. could do a simple port forwarding. configuration, for example: mode http. port 80. balance source. To put this to action, start up the. HAProxy transparent server, for example. the command: haproxy -f win-firewall-haproxy.cfg You then need to do port forwarding on the. Windows firewall, and add the. corresponding interface as a trusted. connection for the application's IP. address.

How to install HAProxy on Mac?

I have a small project in which I need to run HAProxy.

How can I install it on my Mac? The HAproxy package doesn't have any installation guides. It depends on libevent and libpthread for building and running and needs some command line tools to configure, start and shut it down.

Here's a simple step-by-step guide to getting it running on Ubuntu, but it'll work fine on OSX as well. (This is assuming you have a Linux-native version of OSX already installed like on the official bootable discs for the latest versions of OSX/Linux.)
To download all dependencies, use sudo apt-get build-dep haproxy. You may have more dependencies that are part of the corelibs. You can see them all with sudo apt-cache search libev, and it will install anything needed to build the corelibs, or just look at the dependencies on the packages themselves. For example, here's the dependencies on the linux pacakge of the source: /var/lib/haproxy/runtime/haproxyruntime-1.8.2.p1.deb:
/var/lib/haproxy/runtime/haproxyruntime-1.debsigs: Packages in component main: libevent-2.8-13libevent-c2a-cross:amd64 libevent-2.8-13libevent-c2a:amd64 libevent-extra-2.8-13:amd64
This package contains shared libraries for linking with libevent. programs. In addition, all versions of libevent from the libevent-dev/libevent-doc/libevent1 package that are referenced from. these library names, not including those in the libevent3-3.10 transitional package. Also depends on libpcre3 (>= 1:8.22.0). Conflicts: libevent3-3.