Accessing a WSO2 Service

In PPaaS, the backend members in the instances (such as, in a VM setup the VM instances and in a Kubernetes setup the Docker instances) are fronted by a Load Balancer with the use of proxies. The proxyPort property is used to define the port of the Load Balancer. When the Load Balancer receives application traffic, it will route the traffic to the members (worker nodes) in the respective clusters, based on their resource availability.

PPaaS uses a Proxy Service for Kubernetes as there are different service port types with different port ranges. Therefore, in a Kubernetes setup you need to set the proxyPort to zero in the Cartridge definition and define the Kubernetes proxy service port range as 30000 - 32767 using the portRange property in the Kubernetes cluster definition.

Follow the instructions below to access the WSO2 service:

The URL to access a service depends on the port mapping (VM) and port range (Docker) that you defined in the cartridge definition and the Kubernetes cluster respectively.

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When creating the dependent artifacts that are needed to deploy an application, you need to define port mapping, in the cartridge definition JSON, for each port that will be used with the WSO2 product cartridge.
The following examples illustrate how unique proxy ports can be set for ports that are used with the cartridge.

Identify the Load Balancer IP and the hostname of the each of the clusters that are available in the deployed application.
For more information, see Getting the Runtime Topology of an Application.
Map the cluster hostname with one of the Load Balancer IPs.
Each Load Balancer IP refers to the IP of a node.
1. Open the /etc/hosts/ file.
  Example:
  If you are using Vim, which is a text editor, you can open the file in the terminal as follows:
```
vim /etc/hosts/
```
2. Define mapping for all the hostnames against the available LB IPs in the /etc/hosts/ file and save the file.
  <LB_IP> <HOSTNAME>
  Example:
```
172.17.8.103 wso2as-521-application.mgt.as.wso2.org
```
  Each LB IP can have more than one hostname mappings. However, these mappings need to be defined separately in the /etc/hosts/ file.
Use the following URL format to access the WSO2 service (e.g., the ESB service):