Route 53 Flashcards
ELBs do not have a pre defined ipv4 address, you resolve to them using a…
DNS name
What is the difference between an alias record and a crane record?
Cname records point one dns record to another such as google.com to google.co.uk, alias records map directly/internally to the DNS name of alias target such as an AWS resource.
What are the different types of routing policies you can enact?
Simple routing Weighted routing Latency based routing Failover routing Geolocation routing Geoproximity routing Multi value routing
Simple routing, what kind of record setup is this typically done as and what are the key behaviours?
One record for many options addresses, route 53 picks at random the ip assigned to that record set.
Weighted routing, what is the record set layout and the behaviours of this routing service?
One record per weighting, done by choosing a record based on weighting value as a percentage to serve x amount of traffic to a resource.
Health checks, what are these and what is the typical behaviour if one fails?
Can be assigned to a record set, they monitor endpoints for a response, once in the failed state they tell route 53 to not serve this record set until the resource is deemed to be in a healthy state.
Latency based routing, what is this service and what is the record set layout?
Latency based routing tells route 53 to select the record set which has the lowest latency for your client, you create many record sets for each region or resource and route 53 will select the best one for your client.
Failover routing, what is this service and what kind of record set layout do you typically choose for this?
Works by having an active and a passive record set assigned to different resources, works by checking a health check on the active record set, if this fails the health check route 53 with automatically route traffic to the passive record set.
Geolocation routing, what is this service and what kind of record set layout do you typically use for this?
This service lets you choose which record set will be served for your clients geolocation, record sets are created for each regional resource and traffic is sent through the nearest location to your client.
Geoproxminity routing, what is this service and what aws service do you need to use in conjunction with this routing service to make it work?
It allows Amazon to route traffic to your clients based on their geolocation and the geolocation of the resources you want them to access. This service only works if you use aws traffic flow.
Multi value answer routing, what is is service and how are the record sets laid out?
Is made up of multiple record sets which point to resources, it works by selecting the most appropriate record set for the traffic based on whether the resource has passed its health checks, similar to simple routing but with automated failover with health checks.
