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Summary High Availability HA (Beanstalk (load up your code, Beanstalk…
Summary High Availability
HA
Three Types of ELBs
Classic
Application Layer 7
TCP Layer4
504 Error
Application does not response
webserver
dbserver
X-FORWARDED_FOR Header
contains requesters IP not the ELB's one
CloudFormation
Script your environment
templates for complex scenarios
more powerful than Beanstalk
Beanstalk
load up your code
Beanstalk investigate your code and create appropriate environment
load balancing
capacity
health monitoring
ELB monitoring
inService
outService
ELB has PathPatterns
domain/ch/app*
Application ELB can have very complex routing patterns to different groups
Sticky Session
routed to same instance every time
disable if one instance got not served
cross zone LB
across AZs (NOT Regions)
Route53 in combination with ELB to distribute load is good pattern
can have several target groups / ausoscaling groups for each Load Balancer