Configuring HAproxy as a SwiftStack Load Balancer
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1 Configuring HAproxy as a SwiftStack Load Balancer To illustrate how a SwiftStack cluster can be configured with an external load balancer, such as HAProxy, let s walk through a step-by-step example of how to configure a SwiftStack cluster in two tiers: one proxy tier and one storage tier. The chart below shows how it could be set up. Sample Network Topology In a SwiftStack cluster, you can run everything on one flat network, but it is generally better to separate external and internal traffic in the cluster. The following is an example of a network topology: The Outward-facing network is the network which handles incoming traffic. The Cluster-facing network is the internal network which takes care of replication traffic. Page 1 of 5
2 Network Schema Description Subnet Netmask Outward-facing /24 Cluster-facing /24 IP Address Assignments For this example we will be using two (2) proxy nodes and three (3) storage nodes. Node Name Outward IP Address Cluster IP Address proxy proxy storage storage storage Load Balancing SwiftStack includes a load balancer that can be used with very little configuration. The SwiftStack load balancer is based on the LVS open source project. The SwiftStack load balancer binds to a single node and routes requests to each of the other SwiftStack proxy nodes. With an external load balancer any load balancing method may be used, such as simple round robin DNS or a layer 4 or layer 7 load balancer. The type of load balancing you chose depends on your use-case and what your cluster workload will look like. Selecting and setting up the load balancing solution is therefore up to you. SwiftStack has worked with customers who have used everything from round robin DNS using BIND, HAProxy and other open source solutions, as well as commercial equipment from companies like f5 and A10. HAProxy HAProxy is a free, highly configurable and highly scalable HTTP and TCP load balancer. Page 2 of 5
3 HAProxy implements an event-driven, single-process model which enables support for very high number of simultaneous connections at very high speeds. Installing HAProxy The installation examples below are for Ubuntu LTS Server, but should be similar on other Linux distributions. (For CentOS and Red Hat, you might need to enable the EPEL repositories.) To install HAProxy, do the following: $ sudo aptitude install haproxy That s it. Once installed you need to configure HAProxy to start on boot. You can do that by updating the /etc/default/haproxy file by modifying enabled from 0 to 1, as follows: # Set ENABLED to 1 if you want the init script to start haproxy. ENABLED=1 Configuring HAProxy for a SwiftStack Cluster If you are setting up a cluster with an external load balancer, such as HAProxy, you will need to set up your load balancer to divide the load between your proxy nodes. Using the network topology example provided above, if you have selected /24 as your Outward-facing network, you need to set up your load balancer to include the IP addresses of the proxy nodes in its load balancing pool. You will also need to assign the load balancer a virtual IP (VIP) on which it will respond. Here we will use for the VIP and assuming we are using standard HTTP on port 80. So, for this example, the IP addresses used would be: (load balancer IP) (proxy1, included in pool) (proxy2, included in pool) To configure the external load balancer to pull failing nodes out of the load balancing pool, configure the load balancer to use the proxy node s health check URL. The Swift health check URL is simply: /healthcheck Before you modify the HAProxy configuration file, make a backup copy of the default file: Page 3 of 5
4 $ sudo mv /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.orig Create the new, Swift-specific HAProxy configuration file: $ sudo vi /etc/haproxy/haproxy.cfg and make it look as follows: global maxconn 4096 user haproxy group haproxy daemon defaults log global mode http option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout srvtimeout listen webcluster :80 mode http stats enable stats auth username:password balance roundrobin option httpchk HEAD /healthcheck HTTP/1.0 option forwardfor option httpclose server proxy :80 weight 5 check inter 2000 server proxy :80 weight 5 check inter 2000 Lastly, you need to restart HAProxy to make it use the new configuration: $ sudo service haproxy restart In your HAProxy configuration file, you have two stats statements, one with enable and one with auth username:password. This statement enables the HAProxy stats web page. Assuming you used the IP address , the stats page will be available at: Page 4 of 5
5 Your credentials to log in to the HAProxy stats page will be: Username: username Password: password You can of course change any of the settings in the configuration file as you see fit, including the credentials to the stats page. Configuring SwiftStack to Use An External Load Balancer Now that you ve got HAProxy installed and running, you also need to make sure that your SwiftStack cluster is configured to use an external load balancer. To do so, go to the Configure Cluster page on Ensure you have the following settings: Use SwiftStack Load Balancer: Cluster API IP Address: Cluster API Hostname: unchecked (your HAProxy IP address) <blank or the FQDN of your cluster> If you need to make changes to your cluster configuration (as above), to activate your changes, you need to: 1. Click on Submit Changes 2. Click on Push Config to Cluster Page 5 of 5
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