A load balancer helps increase reliability and availability, even in times of high usage and demand, and ensures more uptime and a better user experience. A load balancer is the device or service that sits between the user and the server group and acts as an invisible facilitator, ensuring that all resource servers are used equally. Load balancing distributes network traffic dynamically across a network of resources that support an application. To handle such high volumes of traffic, most applications have many resource servers with duplicate data among them. Modern applications must process millions of sessions simultaneously and return the correct text, videos, images, and other data to each user in a fast and reliable manner. They improve the overall performance of applications by decreasing the burden on individual services or clouds, and distribute the demand across different compute surfaces to help maintain application and network sessions. Load balancers are used to distribute capacity during peak traffic times, and to increase reliability of applications. ![]() To achieve full HA you will need at least 2 load balancers in different regions and point your DNS to both load balancers with round robin DNS entries.A load balancer is a solution that acts as a traffic proxy and distributes network or application traffic across endpoints on a number of servers. Remove response headers: allow to remove http headers returned by the targets to the visitors IP Rate Limiter: limit the maximum number of requests allowed per second per IP address.Īdd/Edit HTTP headers: allow to add or edit http headers returned by the targets to the visitors Host header: by default ($http_host) will pass to the targets the original host received by the load balancer, this can be defined to a fixed value expected by the targets if required. Output cache: Serve cache for a duration configured in seconds for all GET requests Log traffic: log all the traffic (visible in the log tab) Alternatively the original visitor IP is available in the header "x-forwarded-for". Proxy Protocal: forward the original visitor ip address to the backend, Switching proxy protocol on for targets that do not support it will render the whole service inaccessible. Sticky sessions: useful for backends that require visitors to be always forwarded to the same node for session management. More advanced options are available to fine tune your load balancer: In advanced options, you can add up to 1000 custom domain names per load balancer Next, give a name to your load balancer, it cannot be changed, but you can add additional custom domain names to it.įrom there you can click on "Create Load Balancer" button or check the optional advanced configuration below. It's possible to contact the targets over a different protocol if needed, for example from HTTPS on port 443 received on the load balancer to HTTP on port 3000 on the target, this is a very common use case when deploying an application with high availability. It's possible to route TCP, UDP, HTTP & HTTPS traffic from the load balancer to the targets. All incoming traffic will be sent to targets based on the rules defined below, the load balancer will use the "least connections" algorithm to decide where to send the traffic, taking account of target health and current load of targets. Next, configure your forwarding rules from the load balancer to the targets. Since it's possible to point to the global private ip, your targets don't have to be exposed on internet and can be configured to be reached only through the load balancer. You can mix targets from several providers/datacenters, this way you can improve your reliability. ![]() Targets can be services in the same project, or any other target pointed by cname, IPV4, IPV6 or global private IP. Then select one or multiple targets for your load balancer There, select your cloud provider (or BYOVM) then select your preferred region. To create a new load balancer, go to the dashboard and click on Load Balancer on the left side
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