Load Balancing

In the Cluster Deployment section we setup a cluster with 4 machines which can receive read/write request at any time. To balance the requests among these machines, a new or existing machine can be configured to distribute requests among the all the machines.

Example:

To deploy and activate a load balancer on a new machine with IP 192.168.1.44, first a JSON configuration file is deployed:

balancer.json

{
  "sourcePort": 8000,
  "targets": [
    {
      "host": "192.168.1.40",
      "port": 8000
    },
    {
      "host": "192.168.1.41",
      "port": 8000
    },
    {
      "host": "192.168.1.42",
      "port": 8000
    },
    {
      "host": "192.168.1.43",
      "port": 8000
    }
  ]
}

sourcePort is the port at the balancing machine(192.168.1.44). 'targets' are the machines in the cluster with their respective addresses and ports.

Next, execute:

  > trueno balancer --start path/to/balancer.json

You will see a message like the following:

[Success] Started loadbalancer - Logging to /path/to/global/node_modules/trueno/loadbalancer.out

Now you can connect to any machine managed by the balancer using any of the drivers or by using the Web Console at 192.168.1.44:8000.

The balancer process runs as a background process. To stop the balancer, execute:

  > trueno balancer --stop

You will see a message like the following:

[Success] Stopped loadbalancers