Load Balancer

Veeramani Moorthy Veeramani Moorthy

Veeramani Moorthy

Published Jan 15, 2019
+ Follow
  1. As the name suggests, It’s meant for balancing the load across all servers registered with it.
  2. There are 2 dimensions to classify the load balancers,
  • Hardware LB(costly) & Software LB
  • Application LB (Layer 7) & Network LB (Layer 4)

3. Most popular load balancers are,

  • HA Proxy (very comprehensive metrics & monitoring support)
  • Nginx (limited metrics & monitoring support). Paid version (Nginx Plus) has a good support for metrics & monitoring.

4. Various load balancing algorithms are,

  • Round robin
  • Weighted round robin
  • Least connections
  • Response time based

5. Load balancer does periodic health check of the individual servers and ensure not to route the traffic to those ill servers. It can also do TLS termination. It can support session stickiness using browser cookies. Alternatively source IP based routing also helps to achieve session stickiness.  

6. In general, NLBs are more performant than ALB. ALB can do smart routing based on url path or params.

To view or add a comment, sign in

More articles by Veeramani Moorthy

  • NoSQL Toolbox
    Mar 15, 2019

    NoSQL Toolbox

  • RDBMS - Salient points
    Jan 15, 2019

    RDBMS - Salient points

    Though it’s possible to scale the reads using read replicas, there is a limit to this as you may not go beyond limited…

  • Nginx
    Jan 15, 2019

    Nginx

    Nginx is an event driven, high throughput web server. It can be used as a Load balancer.

  • RabbitMQ
    Jan 15, 2019

    RabbitMQ

    It’s a multi protocol (AMQP, MQTT, STOMP) messaging server written in Erlang. Erlang provides actor based concurrency…

  • Elastic Search
    Jan 15, 2019

    Elastic Search

    It’s a distributed, highly scalable, lucene based search engine. Elasticsearch index is sharded and each shard is a…

  • Kafka
    Jan 15, 2019

    Kafka

    Kafka is a pub/sub system on top of distributed, replicated commit log. Kafka provides higher level abstraction called…

  • Pull vs Push
    Jan 15, 2019

    Pull vs Push

    Pull: In pull protocols, the client periodically connects to the server, checks for and gets (pulls) recent events and…

  • CAP Theorem
    Jan 2, 2019

    CAP Theorem

    CAP stands for Consistency Availability & Partition Tolerance. What is availability? Any request sent to non-failed…

See all articles

Explore content categories