Route 53 Flashcards
Route 53
Fully managed DNS Service
Location
Route 53
Not Regional
Route 53
High availability
Route 53
Region-based routing failover
Route 53
SLA
Route 53
100% Availability
Route 53
target monitoring option
Route 53
May set up health checks
Route 53
Record composition (5)
Route 53
- Name
- Type
- Value
- Routing Policy
- TTL
Route 53
CNAME limitation
Route 53
record cannot be the apex of the zone
Route 53
Alias record
Route 53
points hostname to AWS resource
Route 53
domain root option
Alias record
may be the root doman name
Alias record
cost
Alias record
free of charge to query
Alias record
health option
Alias record
can include native health check
Alias record
automation option
Alias record
automatically recognizes changes to resource IP address
Alias record
record type
Alias record
A or AAAA
Alias record
TTL limitation
Alias record
not configurable
Alias record
target limitation
Alias record
target may not be an EC2 DNS name
Alias record
health check
R53
monitor resources
R53
purpose
R53 health check
automate DNS failover
R53 health check
types of health checks (3)
R53 health check
- monitor endpoint
- calculated health check
- monitor CloudWatch alarms
R53 health check
monitor endpoint
R53 health check
query HTTP (or HTTPS, TCP) and confirm response
R53 health check
number of global, public health checkers
monitor endpoint
15
monitor endpoint
interval options (2)
monitor endpoint
- 30s
- 10s (fast)
monitor endpoint
threshold for when endpoint is healthy
monitor endpoint
> 18% health checkers report healthy
monitor endpoint
status codes required for pass
monitor endpoint
2## or 3##
monitor endpoint
additional health check monitor option
monitor endpoint
health check can monitor for text in first 5kB of response
monitor endpoint
firewall requirement
monitor endpoint
public monitor IPs must be allowed by firewall rules
monitor endpoint
