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/
Related
We have a subdomain under our company domain for our application: myapp.company.com.
Few years ago the following setup was done
myapp.company.com points to an elastic IP (done by the company IT)
elastic IP targets an public internet facing EC2 instance
Now I'm trying to find a way to switch that setup so it make use of a classic load balancer.
I created an internet facing classic load balancer
is in the security group of the VPC in which the instance is
targets the instance which is currently reachable through the elastic ip
I'm able visit the web apps on the instance through the load balancer with the public ip defined in
the network interface of the load balancer.
After that, I thought a hosted zone would do the trick of routing the calls to myapp.company.com to the load balancer.
So I created a hosted zone
domain name when creating the hosted zone: myapp.company.com
added an A record which has the load balancer's dns name as alias target
But the load balancer is not used.
If you are going to use Classic Load Balancer, you need to make a note of the string from ELB DNS name (for example, my-load-balancer-1234567890.us-west-2.elb.amazonaws.com). After that, ask your IT support to modify DNS record for myapp.company.com to CNAME which points to ELB:
myapp.company.com CNAME my-load-balancer-1234567890.us-west-2.elb.amazonaws.com
(creating the hosted zone in AWS Route53 will only work after someone (zone owner, so probably IT) delegates authority for your (sub)domain to your AWS name servers, and it is most probably not worth doing just for the sake of one record)
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.
Is it possible to assign a static IP to an AWS load balancer without the need to move your NS records to Route 53?
I basically just want to create an A record from my domain to point to the ELB.
Elastic Load Balancer is a distributed system. It does not have a single public IP address. Instead, when you create an ELB, you are given a DNS name such as ExampleDomainELB-67854125.us-east-1.elb.amazonaws.com.
Amazon gives a facility to set up a DNS CNAME entry pointing for e.g. www.exampledomain.com to the ELB-supplied DNS name.
Also, ELB is directing to one of your instances. Hence, creating a static IP address for ELB will not be feasible.
So as a solution if you need to set your 'A' record from your domain pointing to your ELB in Route53 :
Select 'Yes' for Alias.
Set Alias target as your Load Balancer DNS.
Second way is similar by selecting the CNAME in Route53 and pointing the Alias Target to your ELB.
This should help.
AWS Load Balancer is a very generic term.
You currently have three options for load balancing in AWS:
Application Load Balancers (ALB)
Network Load Balancers (NLB)
Classic/Elastic Load Balancers (ELB)
Of those three only one, the Network Load Balancer can have a static IP address. It's listed in the reference below.
Support for static IP addresses for the load balancer. You can also assign one Elastic IP address per subnet enabled for the load balancer.
It is also possible to "glue" an NLB and ALB together to provide a static IP address and application load balancer functionality. In general you allow a lambda to populate an NLB Target group with your ALB info. It's outside the scope of this answer but the link is below.
If you're using Route53 you can create an A record Alias for your Load Balancer.
If you're not, you can use a CNAME.
References
https://docs.aws.amazon.com/elasticloadbalancing/latest/network/introduction.html
https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/
ELB manage the IP for you, it just gives you the DNS name. So you can't control the IP behind it.
If you need an A record than you need to use A record alias from Route53.
Without using Route 53, you can use CNAME instead of A record.
I have a load balanced environment (min nodes 2, max nodes 4).
The DNS CNAME points to the AWS DNS name for the Elastic Beanstalk, e.g...
awseb-e-a-awsebloa-XXXXXXXX-YYYYYYY.eu-west-1.elb.amazonaws.com
My DNS A-record points to the static IP (elastic IP) of the first EC2 instance (I manually associated the EC2 IP address).
This means anyone referencing www.mydomain.com will go through the CNAME and therefore will be load-balanced.
Anyone accessing without the www prefix (mydomain.com) will go through the A-record and hit the first EC2 instance.
My question is, how can I make the A-Record point to the Elastic Beanstalk instead? I don't want to type its current IP address - because that could change, but I'm more than conscious that pointing to a single node isn't great either.
Since the IP address of the ELB may change time by time, you should create an Alias record with Route53 instead.
https://aws.amazon.com/route53/faqs/#which_dns_records_are_supported
Additionally, Amazon Route 53 offers ‘Alias’ records (an Amazon Route
53-specific virtual record). Alias records are used to map resource
record sets in your hosted zone to Amazon Elastic Load Balancing load
balancers, Amazon CloudFront distributions, AWS Elastic Beanstalk
environments, or Amazon S3 buckets that are configured as websites.
Alias records work like a CNAME record in that you can map one DNS
name (example.com) to another ‘target’ DNS name
(elb1234.elb.amazonaws.com). They differ from a CNAME record in that
they are not visible to resolvers. Resolvers only see the A record and
the resulting IP address of the target record.
I am hosting content on AWS and want to configure my DNS settings so that both my # record and www record point at my Elastic Load Balancer.
example.com (# record)
www.example.com (www record)
AWS recommends setting up domains using CNAMEs as the IP addresses can change.
All the documentation I have seen on the CNAME is that they deal with subdomains but not the primary domain itself (http://example.com
). The primary domain requires an A record and therefore must require an IP address.
I do not want to use an A Record to point the traffic to my Elastic Load Balancer as the IP address may change.
Any idea how I can get around this issue?
I am using Linode to manage my DNS.
You can use a special record type in Route 53 called "Alias".
Q. Can I point my zone apex (example.com versus www.example.com) at my
Elastic Load Balancer?
Yes. Amazon Route 53 offers a special type of record called an ‘Alias’
record that lets you map your zone apex (example.com) DNS name to your
ELB DNS name (i.e. elb1234.elb.amazonaws.com). IP addresses associated
with Amazon Elastic Load Balancers can change at any time due to
scaling up, scaling down, or software updates. Route 53 responds to
each request for an Alias record with one or more IP addresses for the
load balancer. Queries to Alias records that are mapped to ELB load
balancers are free. These queries are listed as
“Intra-AWS-DNS-Queries” on the Amazon Route 53 usage report.
Source: https://aws.amazon.com/route53/faqs/
Just set the Alias to Yes and you will be able to choose your load balancer from the dropdown menu: