AWS - Application Load Balancer: Path based Routing

[@sabatpradeep]

Thanks this video is very crisp and easy to understand

[@Flexclone]

Thank you for putting this together it really help me understand load balancing, vpc, and security groups.

[@rajeshkannan1391]

Very clear and helpful. Thanks for this video. If you have mentioned to replace the > symbol in user data it would have been little easier as well as I blindly copy pasted it and instance was not healty.

[@sudhakaramineni6090]

Thanks a lot Chetan for this video. it was clear explanation how path based routing works .!!!

[@foxezekiel786]

i know Im kind of off topic but do anybody know of a good site to stream new movies online ?

[@Krishnakumar-vu3qc]

Thank you..its really helpful.!!

[@synchronizingsynchronize3066]

such a cool to understand!

[@hamedkhajat5916]

Thanks for the great tutorial. I have a problem hope you can help: I don't have a web app and I need to forward traffic based on the port numbers, is it possible? For example, if the traffic received in ports [3001 to 3200] of the Load balancer forward them to instance A, and if they received in ports [3201 to 3400] forward them to instance B (so I can not specify a specific number in the URL or a string like hi and bye which you did, it is a range of port numbers). And it would be great if they get forwarded to the same port of the instances as they received on the load balancer. It is very important for me, please help.

[@puneetsaneja3007]

Do Application load balancer also manage to distribute request to different instance of an microservice ?

[@AWSwithChetan]

Yes, you can have ECS and EKS containers behind ALB with dynamic port mapping

[@tyronefrielinghaus3467]

Why have you disabled cc? I find having captions very useful...

[@AWSwithChetan]

I will try adding those

[@balajipraveen7287]

Could you please take gateway load balancer demo and aws firewall topic please

[@saranyasanapala1049]

Thanks Chayan very useful can you please share document of this

[@davidpccode]

Hi, Thank you very much. One question.. Why do you create a different subnet one for LB and one for EC2'c. Would the LB be placed in the same subnet as the EC2's subnet?

[@AWSwithChetan]

Typically for Web applications ALB should be in Public Subnet and EC2 should be in Private subnets so that EC2 can not be reached directly.

[@davidpccode]

@@AWSwithChetan great tks!! Can I contact you directly.. we need some help for our company

[@puneetsaneja3007]

I noticed , ALB is path based load balancer. Which load balancer is for instance based i.e request distribute to different instance?

[@AWSwithChetan]

Its optional to use path based load balancing. Normally ALB will just distribute the load across all ec2 instances

[@samrat2295]

Hi, What changes we need to make if the ec2 instances are in private subnets?

[@AWSwithChetan]

Ideally EC2 should be in private subnets only however you need to make sure EC2 has the required application running when they boot up. There are 2 choices: 1. Add a NAT and provide outbound internet access to EC2 instance so that they can execute userdata and download required packages from internet 2. Use custom AMI which has applications preinstalled. In that case EC2 instances do not need internet connectivity

[@puneetsaneja3007]

How we determine , which all target groups associate with my ALB. Is ALB automatically linked all target group which are within the ALB's VPC ?

[@AWSwithChetan]

You have explicitly route the ALB traffic to TGs. You can see this in ALB listeners rules.

[@sureshkavuri6484]

Thanks Chetan for videos.Good explanation.BTW,what is the software you are using for drawing Architecture diagrams.

[@AWSwithChetan]

I used google slides only. Earlier I used to use gliffy but now I am used to google presentation (slides)

[@souvikadak731]

thanks Chetan, for clear view of application loadbalancing, but when im completing the the whole thing, it is giving "503 service temporary unavailable, is it a problem with AZ or I have any mistake, can you please assist me.

[@AWSwithChetan]

This means you don’t have healthy ec2 instance. Go to target group and check instances health. If you have launched ec2 instances in Public subnet and Security group allowa port 80 traffic for everyone then also try to hit the ec2 public ip directly via browser and see if website is on. If not, probably you misconfigured your ec2 instances

[@bhakta_rg]

thanks Chetan, you could have given the ALB security group as source for EC2 instances (in the EC2 instance security group), instead of putting the subnets of the ALBs as best practice

[@dhanwadc]

ibmuser13 nacl can be applied to subnet instead of sg

[@wyangwong4994]

Hello, thanks for the video, is it possible to create 2 EC2 instances with hosting 2 different web application, but same index file "/hi/index.html". I tried configured the target groups to have the same health check path, but I got error 404 when I tried to go to the domain.elb.amazon.com/bye/ path

[@AWSwithChetan]

Yes, just that you need to define on what parameters the decision is made to route request to either of web application. You can do that with 1. Hostname e.g app1.mydomain.com and app2.mydomain.com 2. Path based /app1 or /app2 3. Different ports e.g mydomain.com:8080 to app1 and mydomain.com:8081 to app2

[@thaophuong-jo9bn]

if 2 app ec2 are web servers with the same content. So what is solution to synchronize code data? please tell me fact solution. Thank you

[@AWSwithChetan]

Ideally your apps should be stateless with no data or session stored locally. For data you can have database, for file sharing you may use EFS and for session sharing you can use session store like Redis or dynamoDB. In case your app still has some state then you can enable the stickiness on ALB to route requests from a client to particular web server only.

[@thaophuong-jo9bn]

@@AWSwithChetan maybe you dont understan what i means. 2 my web server are the same code and database. Please dont care about database. for example, i run wordpress on 2 servers (server1 and server2). Some times, i will change code in wordpress on server1, so what is solution to sync changes to server2

[@kavacham222]

While creating a target i am not able to see the subnets, why can u tell me. I have selected and registered as well in load balancer. But able to see in target . Plzz help me

[@AWSwithChetan]

Make sure you are using same VPC while creating load balancer and target groups and EC2 instances.

[@kavacham222]

@@AWSwithChetan yes i am using same Vpc.but still not able to see.And thank you for ur reply.

[@kavacham222]

Thankyou its working.

[@ektavij3778]

I am receiving 503 Service Temporarily Unavailable, please help me.

[@Mishaa222]

Thank you so much for this video.. Sir,I am getting 502 error..Can you please assist me with that?How to make 'healthy' target?

[@phenomenaljay42]

did u fix this?

[@swapnilshingote8773]

Just for ease of exercise you are launching instance in public , but you should have put some more effect and launched the instance in private subnet this would be the video for the real life scenarios......

[@AWSwithChetan]

Yes that’s exactly it should be. Just for ease of setting this up I launched instances in public subnet so that we can setup Webserver using userdata. But you are right, ec2 instances must be in Private subnets.

[@fbsoul1]

thanks

[@akhilesh118]

Do header based login Http Https String based login

[@balajipraveen7287]

Could you please take gateway load balancer demo and aws firewall topic please

[@balajipraveen7287]

Could you please take gateway load balancer demo and aws firewall topic please