Establishing Database Connections from applications

• Applications connect to database by using connection strings, Connection string contains
  • database servers ip/name
  • credentials
  • database name

Auto Scaling

• Cloud providers support autoscaling which can be configured according to our needs
  
• To give a consistent access to the application we create a load balancer with public ip.
• Load balancer should forward the requests to the servers where application is working, to ensure application is working on the servers we perform health checks

DNS (Domain Naming Servers)

• DNS servers maintains records, which is maintained for two purposes
  • Public
  • Internal/Private
• DNS Servers maintain different types of records
  • A => Name to ipv4 address
  • AAAA => Name to ipV6 address
  • CName => alias
    

VPN

• Overview