Leaseweb Public Cloud offers a load balancing as a service based on HAproxy software.
Information
“As a service” in this context means the load balancer software and its configuration are managed outside of the load balancer instance. You will be able to manage the configuration or recreate the load balancer using the customer portal and API interfaces.
Launching a load balancer
The load balancer can be deployed on any instance type. Therefore, we offer all instance types, vintages and sizes to you in order to run a load balancer.
To launch a load balancer, please follow these steps:
- Go to the load balancer launch page
- Choose your instance type. A rule of thumb for resources: 2 vCPU and 2GB RAM per roughly 5K simultaneous connections.
- Give your load balancer a name.
- Provide on which protocol and port the load balancer receives traffic and on which port the instances receive traffic from the load balancer.
- HTTP: default http traffic on port 80.
- HTTPS: https traffic with ssl termination on the load balancer. This requires an ssl certificate to be uploaded.
- TCP: any type of tcp traffic will be directly proxied through to the target group. Use this option also if you want to forward tls traffic.
- Choose the target group you want as targets to receive traffic from the load balancer.
- Choose the contract and payment terms for the load balancer instance and click the Launch button
Load balancer configuration
When the load balancer is running, you will see the instance under your Public Cloud account in the customer portal. The below settings can be managed.
- Manage listener rule
- Load balancer algorithm method
- Client and server idle timeout
- Disable X-Forwarded-For
Manage listener rule
Manage on which protocol and port the load balancer receives traffic and on which port the targets receive traffic from the load balancer.
- HTTP: default http traffic on port 80.
- HTTPS: https traffic with ssl termination on the load balancer. This requires an ssl certificate to be uploaded.
- TCP: any type of tcp traffic will be directly proxied through to the target group. Use this option also if you want to forward tls traffic.
Load balancer algorithm method
- Round robin: Each target in the group is used in turns
- Least Connections: The target with the least amount of connections receives the request or the connection
- Source IP: The client source IP is hashed and divided on total amount of target instances to designate which target instance will receive the request. However the hashing result changes when a list of target instances change, or one of target instances goes offline. That will lead to many clients being directed to a different server. It is best to complement this algorithm with Sticky session setting if yopu use HTTP or HTTPS listener protocol
Client and server idle timeout
Maximum allowed inactivity time for both clients requests and target instance replies after which the connection will be dropped.
X-Forwarded-For
The load balancer will add the X-Forwarded-For header to the HTTP requests it sends to the target instances. This header contains the IP address of the client request.
