Load Balancer Actions

A Load Balancer includes a Virtual IP Address (VIP) that allows users to access your application. Incoming traffic is distributed across backend servers according to the specified load balancing algorithm.

Pre-Creation Planning

• An active Vietnix Cloud account
• A project with sufficient resources
• A virtual network with sufficient IP addresses

Create Load Balancer

1. Login to Vietnix Cloud Dashboard

2. Navigate to Compute > Load balancers

3. Click Create Load balancer

4. Configure the Load Balancer according to your requirements

   • Name: Enter a name for the Load Balancer.
   • Description (Optional): Enter additional description information for the Load Balancer.
   • High Availability:
     • SINGLE: No redundancy.
     • ACTIVE-STANDBY: With redundancy. Failover is performed faster and ensures higher availability compared to the SINGLE architecture.
   • Network: Select the network you want to use. The Load Balancer will be applied to this network.
   • Use a Floating IP Address: Assign a public IP to the Load Balancer. If left unchecked, a new Floating IP will be allocated automatically
   • Click Create to deploy the Load Balancer.

   

Create Balancing pools

1. After creating the Load Balancer

2. Select the Load Balancer you have just created

   

3. Click Create Balancing Pool

   

4. Configure the Balancing Pool:

   • LB to Backend Protocol: Select the protocol to use (HTTP, HTTPS, Terminated HTTPS, TCP, UDP).
   • LB Port: The port on the Load Balancer that receives incoming traffic.
   • Backend Port: The port on the backend server to which the Load Balancer forwards traffic.
   • Balancing Algorithm:
     • Least Connection: Distributes traffic to the server with the fewest active connections.
     • Round Robin: Distributes traffic sequentially across all servers.
     • Source IP: Distributes traffic based on the source IP address, ensuring session persistence.
   • Members: Define the backend servers (members) that will participate in this balancing pool.
   • Health Monitor: Configure health checks for the members. Supported protocols include HTTP, HTTPS, and TCP Ping.
   • Click Create to confirm and deploy the balancing pool.

   

5. Confirm the configuration is complete

   Once complete, you can now access the backend members through the Load Balancer using the assigned Floating IP and the configured protocol.

   

6. Troubleshooting Health Checks

   If you encounter issues with the health checks in step 5, consider the following:

   • Verify Health Check Protocol: Make sure you are using the correct protocol for the backend servers (HTTP, HTTPS, or TCP Ping).
   • Check Security Groups: Ensure that the security groups associated with your backend VMs allow the required traffic.
     • For example, if ICMP traffic is blocked in the inbound rules, using Ping as a health check will fail.
     • Similarly, ensure that HTTP/HTTPS ports are open if using those protocols for health checks.
   • Backend Server Status: Confirm that the backend servers are running and reachable from the Load Balancer’s network.
   • Logs and Metrics: Use the Load Balancer logs or monitoring metrics to identify failed health checks and troubleshoot accordingly.

Balancing Algorithm Guidelines

Algorithm	Best For	Description
Round Robin	General use cases, evenly distributed workloads	Distributes traffic sequentially across all backend servers in order.
Least Connection	Applications with varying session lengths or uneven traffic loads	Routes traffic to the server with the fewest active connections to optimize resource usage.
Source IP	Session persistence, user-specific applications	Ensures a client with the same source IP is always directed to the same backend server. Useful for apps requiring sticky sessions.

What's Next?

• Add Member to Load Balancer - Learn how to Add Member to Load Balancer in Vietnix Cloud
• Add Allowed CIDRs - Learn how to Add Allowed CIDRs in Vietnix Cloud