kandi X-RAY | ALB Summary
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QUESTION
Using AWS Direct Connect, we've built a network between our on-premise and our AWS VPC. We've developed a web application that users will access from within the on-prem network. We're using the HTTP API Gateway, which uses a VPC Link to connect to the private ALB. We've used a Custom Domain Name with the HTTP API Gateway and disabled the default endpoint. The domain name is registered in a private hosted zone on Route 53.
We want to keep all the traffic between the clients and the API Gateway within our private network. However, we can see that the requests going to the HTTP API Gateway leave our network because the custom domain name for the API Gateway resolves to a public IP address.
Is there a way to assign a private IP address to the HTTP API Gateway? Or any other way to keep the traffic within our network?
One option is to switch to the REST API Gateway and make its endpoint type Private. However, the HTTP API Gateway suits our needs much better with its simplicity. It also has the option for connectivity to an ALB using VPC Link, which the REST Gateway lacks.
...ANSWER
Answered 2022-Mar-17 at 11:48Sadly no, the HTTP APIs do not support Private APIs. Whatever solution you will use, HTTP API endpoint must be public.
You have to use REST API, or create your own fully custom solution if REST API is out of question.
QUESTION
I am trying to show native ads in Flutter.
https://codelabs.developers.google.com/codelabs/admob-inline-ads-in-flutter
https://github.com/googlecodelabs/admob-inline-ads-in-flutter
I used this codelab but they are showing small native ads.
In fact, I successfully implemented their codelab in my Flutter project.
But I want to make size medium, not small.
https://developers.google.com/admob/ios/native/templates
GADTSmallTemplateView(It seems this one, I don't want like small size)
GADTMediumTemplateView(My aim is to make my native ads like this one)
What is height in the codelab?
...ANSWER
Answered 2022-Mar-08 at 16:21I summed height of all elements in the design. It was 308. Then, I think 310 will be an ideal number. No problem, when I make it 310. Everything seems good.
QUESTION
I have a dataset with ~ 150 countries, a grouping variable, and a value for each country and group (0-6). I am trying to show, that countries with a higher GDP get higher values in one group than the other. I made a scatterplot showing the values for each country by group (the countries are sorted by GDP). I want to draw a line around the points, so it becomes more aparent which group has higher values in which range of GDP. I am however, at a loss.
...ANSWER
Answered 2022-Mar-05 at 14:03Here's one idea to help visualize the difference you are trying to show. Firstly, the country names on the x axis are likely to remain illegible however you try to label them. It might therefore be better to have the rank of the countries on the x axis.
Drawing a polygon around the points might make the point visually, but doesn't make much sense in statistical terms. What might be better here is to plot a regression with a separate line for each group. Since we are dealing with count data, we can use Poisson regression, and since we have a numeric rank on the x axis, it is possible to have lines going across your plot to show the regression.
QUESTION
We use an Application Load Balancer behind which we have an nginx server. Our client has asked us to implement mTLS but I don't think that works if the ALB terminates TLS connections.
I know that our ALB currently swaps out the self-signed certificate of our nginx server and replaces it with its own, which is a pretty good indication that it terminates TLS connections.
If we can't change that we'd have to switch to an NLB instead.
Can an ALB be configured to work without terminating TLS connections in AWS, or is that impossible?
...ANSWER
Answered 2022-Feb-17 at 13:13You are correct. ALB unfortunately does not support mTLS at this time, (I really wish AWS would add that feature). And since ALB needs to terminate the SSL connection in order to do all the things it does like path forwarding, etc.. there is no way for them to add TCP pass-through to the ALB. You will need to switch to an NLB, and handle all the SSL certificate stuff on your server.
QUESTION
I am trying to deploy a PHP through AWS CodeDeploy and am currently stuck on the AllowTraffic step in CodeDeploy. The application is on an EC2 instance behind an ALB. In the ALB, I am getting failing health checks. I have the PHP application code sitting in the following directory on the EC2 instance: /var/www/html/src
. If I were to curl the private IP of the EC2 following by the directory where the code sits, I am getting an error 404 Not Found. Even though the index.php
file is in that directory, I am unable to curl it. Currently I have security groups setup where the ALB security group allows any traffic from only HTTP, and all traffic from the ALB security group is allowed to reach the EC2 instance. I am able to curl the root of the instance and see Apache's default page.
If I were to adjust the health check settings on the ALB Target group, I get a 403 error when setting the health check to /
. I get a 404 error when specifying the path to the directory that has the PHP application code.
Any advice on how I can get the instance to a healthy state for the ALB would be appreciated.
Application Load balancer security group allows traffic on port 80 EC2 instance security group allows traffic from Application Load Balancer security group.
The PHP application should be accessible on port 80, where Apache is running. The Application Load Balancer has only 1 listener that is set up for port 80, that forwards traffic to the target group.
...ANSWER
Answered 2022-Feb-16 at 03:33The heath check path in your TG should be URL path, not the actual location on the EB instance. You can try with just /index.php
:
QUESTION
If we need static IP address in AWS for Load balancer then we have to go for Network Loadbalancer forwarding requests to Application Loadbalancer.
Now since ALB only supports HTTP and HTTPS protocols And NLB only supports TCP protocol
How does this communication actually work?
The client like browser will send the request in HTTP or HTTPS. How does this communication happens ?
...ANSWER
Answered 2022-Jan-27 at 06:24HTTP/HTTPS
runs on top of TCP
. If you check Open Systems Interconnection model, HTTP/HTTPS
are at the top application layer, whereas TCP
is at transport layer.
ALB supports only application layer (HTTP/HTTPS in that case), while NLB works on transport layer (TCP/UDP). Thus NLB can load balance anything above TCP as well. This include HTTP
, SSH
, FTP
and so on.
There is no protocol conversion between TCP and HTTP, as they work on different layers. So everything happens transparently.
QUESTION
Background: We're using AWS Cloud Development Kit (CDK) 2.5.0.
Manually using the AWS Console and hard-coded IP addresses, Route 53 to an ALB (Application Load Balancer) to a private Interface VPC Endpoint to a private REST API-Gateway (and so on..) works. See image below.
Code: We're trying to code this manual solution via CDK, but are stuck on how to get and use the IP addresses or in some way hook up the load balancer to the Interface VPC Endpoint. (Endpoint has 3 IP addresses, one per availability zone in the region.)
The ALB needs a Target Group which targets the IP addresses of the Interface VPC Endpoint. (Using an "instance" approach instead of IP addresses, we tried using InstanceIdTarget
with the endpoint's vpcEndpointId
, but that failed. We got the error Instance ID 'vpce-WITHWHATEVERWASHERE' is not valid
)
Using CDK, we created the following (among other things) using the aws_elasticloadbalancingv2
module:
ApplicationLoadBalancer
(ALB)ApplicationTargetGroup
(ATG) aka Target Group
We were hopeful about aws_elasticloadbalancingv2_targets
similar to aws_route53_targets
, but no luck. We know the targets
property of the ApplicationTargetGroup
takes an array of IApplicationLoadBalancerTarget
objects, but that's it.
ANSWER
Answered 2022-Jan-12 at 17:47This blog shows how to configure the architecture given in the question using AWS console (just disable the global accelerator option). The key takeaway is that the application load balancer uses target type IP and resolves the VPC endpoint domain name manually in step 2. The other two options, instance (target is an EC2 instances) and lambda (target is an AWS Lambda function) cannot be used.
The ec2.InterfaceVpcEndpoint
construct has no output which directly gives an IP address. The underlying CloudFormation resource also does not support it. Instead, you will have to use the vpcEndpointDnsEntries
property of ec2.InterfaceVpcEndpoint
and resolve the domain names to IP addresses in your code (the console configuration also required the same domain name resolution). You can use an IpTarget object in your ApplicationTargetGroup.
At this point, you will run into one final roadblock due to how CDK works under the hood.
If you have all your resources defined in one CDK application, the value for each parameter (or a reference to the value using an underlying CloudFormation functions like Ref, GetAtt, etc.) needs to be available before the synthesize step, since that's when all templates are generated. AWS CDK uses tokens for this purpose, which during synthesis resolve to values such as {'Fn::GetAtt': ['EndpointResourceLogicalName', 'DnsEntries']
. However since we need the actual value of the DNS entry to be able to resolve it, the token value won't be useful.
One way to fix this issue is to have two completely independent CDK applications structured this way:
- Application A with VPC and interface endpoint. Define the
vpcEndpointDnsEntries
and VPC-ID as outputs using CfnOutput. - Application B with the rest of the resources. You will have to write code to read outputs of the CloudFormation stack created by Application A. You can use Fn.importValue for VPC ID, but you cannot use it for the DnsEntries output since it would again just resolve to a Fn::ImportValue based token. You need to read the actual value of the stack output, using the AWS SDK or some other option. Once you have the domain name, you can resolve it in your typescript code (I am not very familiar with typescript, this might require a third party library).
Image credits:
QUESTION
Here is my input DataFrame
...ANSWER
Answered 2021-Dec-23 at 13:13Your first groupby was correct, after that you want to sort your values based on State and Count.
Then you group again solely on the state and fetch the head(2). If you want, you can (re)set your index to State and City.
QUESTION
I have 1 question regarding migration from Nginx controller to ALB. Does k8s during migration will create a new ingress controller and switch smoothly services to new ingress or will delete an old one and after that will create a new ingress? Why I ask that, because we want to change ingress class and we would like to minimize any downtime. Sorry for newbie question, because I didn't find any answer in doc
...ANSWER
Answered 2021-Dec-07 at 18:05- First, when transitioning from one infrastructure to another, it's best to pre-build the new infrastructure ahead of the transition so it will be ready to be changed.
- In this specific example, you can set up the two IngressClasses to exist in parallel, and create the new ALB ingress with a different domain name.
- In the transition moment, change the DNS alias record (directly or using annotations) to point at the new ALB ingress and delete the older Nginx ingress.
- In general, I recommend managing the ALB not as ingress from K8s, but as an AWS resource in Terraform/CloudFormation or similar and using TargetGroupBindings to connect the ALB to the application using its K8s Services. https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.3/guide/targetgroupbinding/targetgroupbinding/
QUESTION
I'm trying to calculate the gradient within tensorflow, however returning None
. I have already adjusted the type to be tensorflow.python.framework.ops.EagerTensor
, however htis did not solve the problem.
This is the code so far:
...ANSWER
Answered 2021-Dec-03 at 12:14You need to use tf.keras.losses.CategoricalCrossentropy
for loss computation instead of tf.keras.metrics.CategoricalCrossentropy
which works differently and will stop gradient propagation.
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