I am new to OpenSearch or AWS in general. I was trying to debug a recent issue with OpenSearch service when I came across these docs
As per this documentation:
OpenSearch Service assigns each ENI a private IP address from the IPv4 address range of your subnet. The service also assigns a public DNS hostname (which is the domain endpoint) for the IP addresses. You must use a public DNS service to resolve the endpoint (which is a DNS hostname) to the appropriate IP addresses for the data nodes:
While this FAQ section says:
A load balancer sits in front of each OpenSearch Service domain. The load balancer distributes incoming traffic to the data nodes.
Also, this blog says:
When Amazon ES creates your domain, it launches instances into a service-controlled VPC. Those instances are fronted by Elastic Load Balancing (ELB), and the endpoint for the load balancer is published through Route 53. Requests to the domain pass through the ELB load balancer, which routes them to the domain’s EC2 instances.
When I tried dns lookup for the domain endpoint using this tool, I got the same number of A records as my data nodes in the OpenSearch service domain.
So does the OpenSearch domain name point to a load balancer or the data nodes?
Related
How does amazon ec2 work in regards to routing a domain name to an instance using load balancers?
What is the flow of a request from the domain name to the ec2 instance?
There is documentation regarding this on AWS, you can check the page Routing traffic to an ELB load balancer - Amazon Route 53 which contains the details.
Moreover in the above document there are links to other pages like how to use Route 53 etc., you will get full coverage of what you are looking for.
The flow of traffic is as shown below.
Hosted zone => Load balancer => Target group => EC2 Instance.
So when you make a request to a domain name the request is routed following the "rules" that are in its hosted zone.
A hosted zone is a container for records, and records contain
information about how you want to route traffic for a specific domain,
such as example.com, and its subdomains (acme.example.com,
zenith.example.com). A hosted zone and the corresponding domain have
the same name.
In one of the rules that you set in the hosted zone there should be a rule(a record) that directs traffic from your domain name to the load balancer. The record is of 'A type'.The load balancer then routes the traffic to the target group.
A load balancer distributes incoming application traffic across
multiple EC2 instances in multiple Availability Zones. ... Elastic
Load Balancing detects unhealthy instances and routes traffic only to
healthy instances. Your load balancer serves as a single point of
contact for clients.
The target group then has records called targets. This targets store information like EC2 instance id, port, health status among others. The target info informs how traffic is routed. If the health status is unhealthy traffic is routed to a target with a healthy status or an error is returned as a response.
A target group tells a load balancer where to direct traffic to : EC2
instances, fixed IP addresses; or AWS Lambda functions, amongst
others. When creating a load balancer, you create one or more
listeners and configure listener rules to direct the traffic to one
target group.
When traffic is routed from the target group to a healthy target it goes to the EC2 instance that the EC2 instance id belongs to. In the EC2 instance there should be a server running that takes the request and gives back the appropriate response.
An Amazon EC2 instance is a virtual server in Amazon's Elastic Compute
Cloud (EC2) for running applications on the Amazon Web Services (AWS)
infrastructure.
I am trying to configure route53 A record for a domain in its hosted zone using the Alias Target drop down i can see the following options like
S3 website endpoints
ELB Application load balancers,
ELB Classic load balancers,ELB
Network load balancers,
CloudFront distributions,
Elastic Beanstalk environments,
VPC Endpoints,
API Gateway APIs,
Record sets in this hosted zone
My application doesn't need a load balancer and is running in a single EC2 instance i wanted to provide the Alias target to the instance public IP instead of hard coding the instance public ip in the A record set. Because the public IP is ephemeral and gets changed after every restart.
one way to do this is to reserve a elastic IP and associate with a ENI and attach it to the ec2 instance and put the reserved elastic IP as A record in the record set.
Is there any other way to put the reserved elastic IP or instance ip as Alias Target in route53 record set.
the client can connect to domain ->elb->ec2 instances in AWS. some of client has to connect to statistic IP address instead of dynamic IP range. however AWS ELB does not support static IP address. So I want to setup on proxy layer that route the request to our existing elb or instances.
requirement:
1.AB zone HA availability
2.0 failure tolerant
3.attache static IP addresses (>= 2 elastic IP)
4.create new sub-domain in route 53 to route traffic to proxy setup
5.proxy layer can route the traffic to existing ELB
6.the proxy log can upstream to cloudwatch
7.can cater for 5 tps traffic
8.auto failover
9.can throttling in terms of tps/traffic
initially i am consider use NLB but NLB cannot connect to ALB/ELB.
Any best practise on setup proxy in AWS with static IP addresses.
Thanks
so far the solution :
create small EC2 instances and setup HA-proxy
domain map to elastic IP (more than one) to those HA proxy instances
use Nginx/apache web server as reverse proxy setup
config and route to existing public/private domain
I have DNS service provider(web application) as godaddy with CNAME record resolving to DNS value of application load balancer in #AWS. There is requirement where the webapplication request from customer network should route/resolve to specific AWS region based on IP address /subnet of customer. Is there a feature in R53 or load balancer to achive this. I see there is such feature in mircosoft #azure traffic manager to do subnet based routing!. Thank You
It seems you need Route53's geolocation routing, as it works by mapping the IPs from the originating DNS queries to specific AWS resources, like in your case, the loadbalancer.
Here's a link to the resource: https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routing-policy-geo
I have brought example.com from one of address sellers.
On AWS I have Application Load Balancer.
I have created Route53 hosted zone and added this load balancer as A record alias:
How should I receive this records constant IP address to link my external DNS A record to this Route53?
I can't put CNAME to example.com, only sub-domain. When adding IP from Test Record Set IP list, they are changing from time to time.
You want to switch to using a Network Load balancer to get a consistent IP address.
Static IP support
Network Load Balancer automatically provides a static IP per Availability Zone (subnet) that can be used by applications as the front-end IP of the load balancer.
https://aws.amazon.com/elasticloadbalancing/details/#details
Also you'll want to switch to an ALIAS instead of an A record.
Queries to Alias records that are mapped to Elastic Load Balancers,
Amazon CloudFront distributions, AWS Elastic Beanstalk environments,
and Amazon S3 website buckets are free
https://aws.amazon.com/route53/pricing/