Comments on: Amazon Elastic Load Balancer Setup

By: Michael

Michael — Fri, 11 Nov 2011 13:13:24 +0000

I’m trying to use ELB on amazon implementing a cluster load balancing on MySQL. My question is that i’m affraid of the way the security is handled there because there is no IP on balancer but only a DNS. So can’t anyone telle how to assume that only the balancer would forward request to my database?

By: Rituraj

Rituraj — Tue, 13 Sep 2011 12:54:27 +0000

Hi All,
My scenario is ELB + Autoscallling with a single MySQL instance. ELB health check is calculate by port 22 as unable to configure 3306 port for health check. Auto scale is basis on CPU utilization. When CPU utilization is > 30% scale up a new instance and when < 5% extra instance will be scaled down. Everything is fine. on scale up ELB will divide query request to both instance. But when scaled down, how requests are handle? e.g. if 1st instance get 100 request to process, and 2nd also get 200 to process and CPU utilization in both are < 5%. Now auto scale will terminate a instance. let it be 1st one. Now question is what happen of these 100 requests? Are these requests are lost due to termination or ELB will wait to complete process these requests and then termination take place ?

Thanks in advance.
-RITURAJ

By: Lucky

Lucky — Fri, 02 Sep 2011 10:44:37 +0000

Please help me I am new to amazon .

Thanks in advance

This is my setup

LOAD BALANCER
|
|
|————————|
MACHINE1 MACHINE2

I need to know is it correct or do I need to modify this? It has been 12 hours that my domain is not pointing to the loadbalancer

Are all these DNS records are correct or more must be added? Do I need to add the IP ADDRESS OF my webserver?

mydomain.com A(Alias) loadbal-123456789.us-east-1.elb.amazonaws.com
http://www.mydomain.com A(Alias) loadbal-123456789.us-east-1.elb.amazonaws.com
mydomain.com NS ns-1638.awsdns-12.co.uk.
ns-148.awsdns-18.com.
ns-842.awsdns-41.net.
ns-1455.awsdns-53.org.

mydomain.com SOA ns-1638.awsdns-12.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

By: Tham Tu Thanh Long

Tham Tu Thanh Long — Thu, 28 Apr 2011 04:26:26 +0000

Thanks,
It is good for me.

All command should has [--region ]

tham tu

By: Bin

Bin — Sat, 02 Apr 2011 01:01:27 +0000

Great article!

“You can have as many –listener parameters as you want” – is this true? May i put 1000 listeners? I’d like to use it as a ftp load balancer to support passive mode, so need to open many ports.

I cannot setup LVS, as it seems that LVS does not work with EC2 because of no supporting of IPIP or NAT or direct routing.

By: Steve

Steve — Fri, 17 Dec 2010 16:32:03 +0000

What you need to do is centralize your session data. For example in ASP.net you can take your session state from in-proc (the default) to out of proc by using the ASP.net Session State Service or SQL Server to store your session state data. This way all the server in your web farm are accessing the same sessions.

By: Ryan

Ryan — Fri, 17 Dec 2010 07:34:17 +0000

FYI I am thinking of a CRM, CMS or ERP when I mean dynamic. I know some CMS systems allow sharding of the db

By: Ryan

Ryan — Fri, 17 Dec 2010 07:21:41 +0000

Great article… This may be a dumb question but if the site is dynamic and the ELB is hitting different instances how are the instances remaining in sync from a top down network design level? …This is one thing that always got me, unless the db was separate and the web servers were both hitting it (or it was being mirrored?)

Id like to use ELB but dont know how from a design standpoint.

Thanks!

By: Summer Camps

Summer Camps — Sat, 30 Oct 2010 03:31:03 +0000

You you should edit the page name Amazon Elastic Load Balancer Setup | SerkTools to something more suited for your content you write. I loved the blog post withal.

By: Steve

Steve — Fri, 18 Jun 2010 03:25:11 +0000

Unfortanently right now there is no way to determine the source IP.