Azure-in-bullet-points

Load Balancer Options

• All load balancers are software appliances (software defined networking: SDN)
• 💡 Only Standard (not Basic) SKU allows availability zones in Load balancer

Public Load Balancer

• OSI Layer 4 TCP and UDP
• Internet-facing, has public IP address
• Offers two distribution modes
• Set-up public load balancer
  1. Settings -> Back-end-pools-> Add VM’s
  2. Settings -> Health-probe -> Add health probe
     • E.g. tcp-80-probe (HTTP) probe
     • Set interval -> time between prop events
     • Set unhealth threshold (e.g. 2) before VM is dropped out from the pool
     • Add load balancing port
     • Incoming request from port 80 (port) will be passed to TCP passed 80 (back-end port)
     • Select backend pool & health-probe
     • Set session persistance
     • Floating IP (direct server return)
       • Use with internal load balancers
       • Use with SQL server always on cluster
       • Used when same back-end port needs to be used across multiple rules in a single Load Balancer.
  3. Add inbound NAT rule
     • Map TCP 5000 to a VM’s RDP port (3389)
     • Map TCP 5000 to a VM’s RDP port (3389)

Internal load balancer

• OSI Layer 4 TCP and UDP
• Applies to traffic only within a virtual network
  • No public IP address
• Good for applying load balancing to n-tier application services (database)

Application Gateway

• OSI Layer 7 application
• Application Delivery Controller (ADC) as a service
• SSL offload
• Has Web Application Firewall (WAF)

Traffic Manager

• DNS-level
• Geographical load balancing
• Offers different routing methods

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