MultiCloud Classroom notes 02/Jul/2025

Understanding load balancing

• Loadbalancer is used to distribute load across multiple servers
  
• LoadBalancer gets an ip address/name which is used to connect to multiple servers.
• Load Balancers are of two types
  • Hardware Based
  • Software Based
• Cloud Providers offer load balancers with all the necessary features
• Load Balancers for applications act at two layers
  • layer 4:
    • This operates at tcp/udp, ip address, port
  • layer 7:
    • In addition to layer 4 it understand http(s)
      • url
        • name based routing
        • path based routing
      • header based
• LB have sticky sessions
• Cloud LBS have an option to automatically detect the scaled servers
• Cloud LB’s forward the request to the servers where the health checks are passing

Layer 4 LB

• Layer 4 LB are fast and generally they are used to lb one application
  
• It is possible to increase applications which this LB will serve, in that case each applicaton should be calling a differnt port of lB

Layer 7 LB

• Layer 7 LB offer more features such as
  • path based routing
  • name based routing
  • header based routing