am trying to route console.example.com to an internal load balancer that is located in a private subnet. My current architecture is as follows:
I have a public VPC and a private VPC.
A React app is running on an ECS cluster and its service (console-service) is located in the private VPC.
The internal load balancer has two listeners: one for HTTP on port 80, which forwards requests to port 443, and the other for HTTPS on port 443, which forwards requests to the task definition for the console-service. Additionally, the listener on port 443 has a certificate for console.example.com.
The OpenVPN connector's instance is located in the public VPC.
The public and private VPCs communicate with each other via a transit gateway.
I know that the routes are working because if I reach the console-service's private IP (private-ip:3000), I can access the website. I also know that the certificate and load balancer are working because if I SSH into an instance that is located in the private VPC and curl console.example.com, I can access the website. I believe that the issue is with the configuration of the OpenVPN's DNS settings. Currently, I added a network application that is like console.example.com - my-network, but I still cannot access the website with the domain.
I found out I made a rookie mistake. I just need to add HTTP/HTTPS to the security group's inbound rules that I use for my load-balancer.
Related
Using Terraform to setup a VPC with two EC2s in private subnets. The setup needs to SSH to the EC2s to install package updates from the Internet and install the application software. To do this there is an IGW and a NAT-GW in a public subnet. Both EC2s can access the Internet at this point as both private subnets are routing to the NAT-GW. Terraform and SSH to the private subnets is done via Client VPN.
One of the EC2s is going to host a web service so a Classic mode Load Balancer is added and configured to target the web server EC2. Using Classic mode because I can't find a way to make Terraform build Application mode LBs. The Load Balancer requires the instance to be using a subnet that routes to the IGW, so it is changed from routing to the NAT-GW, to the IGW. At this point, the Load Balancer comes online with the EC2 responding and public Internet can access the web service using the DNS supplied End Point for the LB.
But now the web server EC2 can no longer access the Internet itself. I can't curl google.com or get package updates.
I would like to find a way to let the EC2 access the Internet from behind the LB and not use CloudFront at this time.
I would like to keep the EC2 in a private subnet because a public subnet causes the EC2 to have a public IP address, and I don't want that.
Looking for a way to make LB work without switching subnets, as that would make the EC web service unavailable when doing updates.
Not wanting any iptables or firewalld tricks. I would really like an AWS solution that is disto agnostic.
A few points/clarifications about the problems you're facing:
Instances on a public subnet do not need a NAT Gateway. They can initiate outbound requests to the internet via IGW. NGW is for allowing outbound IPv4 connections from instances in private subnets.
The load balancer itself needs to be on a public subnet. The instances that the LB will route to do not. They can be in the same subnet or different subnets, public or private, as long as traffic is allowed through security groups.
You can create instances without a public IP, on a public subnet. However, they won't be able to receive or send traffic to the internet.
Terraform supports ALBs. The resource is aws_lb with load_balancer_type set to "application" (this is the default option).
That said, the public-private configuration you want is entirely possible.
Your ALB and NAT Gateway need to be on the public subnet, and EC2 instances on the private subnet.
The private subnet's route table needs to have a route to the NGW, to facilitate outbound connections.
EC2 instances' security group needs to allow traffic from the ALB's security group.
It sounds like you got steps 1 and 2 working, so the connection from ALB to EC2 is what you have to work on. See the documentation page here as well - https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Scenario2.html
I have deployed a Strapi.io app on AWS EC2 Following the documentation provided by strapi.io on their site.
Everything went great but when i try to reach the public IP of my EC2 instance, it is unreachable.
I have checked assigned an elastic ip.
I have also checked the gateway and security group, every thing is good but still my IP is unreachable.
Security Group Setting
Check your routing table of the subnet. If it routes the cidr 0.0.0.0/0 to the internet gateway, then the subnet is public and can connect by the public ip. If it routes to the NAT gateway, then the subnet is private and you need the load balancer or bastion to connect the ec2 on the private subnet by private ip. On the private subnet, the public ip is useless.
The issue here is that you need a web serever or reverse proxy like nginx, apache to listen on the port 80 and server your application. Currently, you would not have a web server configured for your app so you do not get any response when you hit the IP Address in your browser.
My application is working fine on the Amazon EC2 Windows Server. But when I am trying to access the same through the elastic public IP, it is not accessible. I have seen the inbound configurations and the ports(HTTP,HTTPS,SSH) are enabled. Infact, I added a rule to All Traffic from Anywhere. But no success.
Firewall ports are open in host server. The URL is accessible from private IP from other EC2 machines in same network
http://3.45.54.89:8080/My-App/ ----> Public IP- Not Working
http://10.0.2.23:8080/My-App/ ----> Private IP - Working
Please guide. Stuck Badly in this
The fact that you can access the port from within the network points out that you indeed have a rule somewhere in the VPC that is blocking the connection from outside the network.
Here are the components you need to access a resource inside a VPC from outside the VPC:
Internet Gateway: This is the entry point into the VPC. Seems like this is already working as expected as you can access the instance in the first place.
(optionally) Bastion host: If the resource you are trying to connect to is in a private subnet you need a bastion host in the public subnet. Read more about it here.
NACL: If you have not changed the defaults, this should allow the requests to flow through. Note that NACL are stateless i.e. you need to allow both inbound and outbound.
Security Group: As the final layer, the security group should allow the traffic on the ports, to the appropriate cidr block.
Based on the scenario you have described, my guess is that your instance is in a private subnet. If it is, then you need to route the requests through something in the public subnet.
Edit the firewall ports for an IIS website in Windows Server. if the iis apps are not in the inbound list please add them and try again.
https://www.youtube.com/watch?v=YQcklFuWrcw
I configured an internet facing ALB in AWS with two listeners (80 and 443) and the target groups are in private network (10.0.1.0/24). When http/https request are sent by ALB to the target group in 10.0.1.0 network, how the request is sent back to ALB? ALB has a public IP, and the target group do not have a route to internet. I can configure a NAT gateway and setup a route 0.0.0.0/0 to use the NAT gateway. But the web response will go all the way to internet and then comeback to ALB. Highly undesirable. I can't put these instances in public facing subnet either.
Can some one help how this can be done? I thought of VPC endpoint, and configured one with the load balancer (I used ELB, as I couldn't find ALB endpoint service). Now, the endpoint shows it has an IP in the 10.0.1.0 subnet. However, I don't know how this will work. Can someone suggest what's to be done. Thanks.
Not sure exactly what your question here is. But giving you a simple explanation of how AWS ELB works.
In both AWS Classic Load Balancers and Application Load Balancers, two connections are involved:
A connection between client (browser, etc) and ELB
A connection between ELB and backend target instances (webservers)
When creating an Internet facing ELB, you are given the option of selecting two subnets. These subnets should be public subnets which have a route to an Internet Gateway. The ELB will launch at least one ELB node in each of these subnets. Clients on the Internet will be able to connect to these ELB nodes using their public IPs through the IGW.
Once the ELB receives the request from the client, it forwards the request to its backend targets. This communication uses the PRIVATE IPs of the ELB nodes and the target instances. Therefore, even if the instances are in the private subnet, the ELB will still be able to forward requests to them because the connection is over private IPs which uses the 'local' route in the route tables. The response from the target then goes to the ELB over private IP, and is then forwarded to the client over public IP.
Client <--public IP--> ELB <--private IP--> Targets
The connection between client and ELB is over public IP, the connection between ELB and webservers is over private IPs which does not need a route to an IGW or NAT.
Don't worry about NAT Gateways for your private subnets. Just make sure the subnets you choose when creating the ELB are public and have a route to an internet gateway.
I have this current Cloudformation config setup:
PasteBin example here
This runs a web app, there's also some networking config in there which routes outbound traffic through a nat gateway with an elastic ip.
--
Separately we have a manually created site-to-site VPN setup in AWS
screenshot, elastic ip created by cloudformation :
The other side of the VPN specified that our private ip range for the connection to work has to be in 192.168.242.0/24.
Also they have specifically whitelisted 192.168.242.230 at their end. Which is the private ip of the elasticip which the Cloudformation above created.
How can I establish a connection from my EBS ec2 instance to a server protected by this VPN? At the moment the connection just times out.
You would need to add a route table rule to allow traffic to X.X.X.X/X flow via the Virtual Private Gateway(vgw-xxxxxx)
Destination Target
x.x.x.x/x vgw-xxxxxx