Elastic Load Balancing Supports Cross-Zone Load Balancing


Amazon Web Services announced cross-zone load balancer, which supposed to further improve distribution of requests amongst all the instances behind the load balancer. If you enable cross-zone load balancing, you no longer have to worry that clients caching DNS information will result in requests being distributed unevenly, resulting more even load. I went ahead and tried it out myself.
Enabling the Cross-Zone Load Balancing goes through the command line, you need to download and configure the tool on your computer before proceeding. Read the instructions how to download, install and configure ELB command line tools here.

List all the load balancers:
elb-describe-lbs

Enable the cross-zone load balancing
elb-modify-lb-attributes loadbalancer-id --crosszoneloadbalancing "enabled=true"

Verifying:
elb-describe-lb-attributes loadbalancer-id --headers
CROSS_ZONE_LOADBALANCING  CROSS_ZONE_LOADBALANCING_ATTRIBUTE_VALUE
CROSS_ZONE_LOADBALANCING  true

Now your load balancer has cross zone load balancing enabled.


See the screenshot from CloudWatch metrics showing our proprietary MetaSearch Gateway servers behind load balancer before and after enabling cross zone load balancing - the difference is noticeable. Enabled this feature on all my ELBs, and so far so good. Hopefully they will implement it in their UI and enable this great feature by default. Thanks AWS, yet another great improvement!
Location: Manhattan, New York, NY, USA

Comments

Post a Comment

Popular posts from this blog

Stubbing and Mocking Static Methods with PHPUnit

Image
PHPUnit has ability to stub and mock static methods. Consider the class Foo : <?php class Foo { public static function doSomething() { return static::helper(); } public static function helper() { return 'foo'; } } ?> To test the static helper() function with PHPUnit, you can write you test like that: <?php class FooTest extends PHPUnit_Framework_TestCase { public function testDoSomething() { $class = $this->getMockClass( 'Foo', /* name of class to mock */ array('helper') /* list of methods to mock */ ); $class::staticExpects($this->any()) ->method('helper') ->will($this->returnValue('bar')); $this->assertEquals( 'bar', $class::doSomething() ); } } ?> The new staticExpects() method works similar to the non-static expects
Read more

Enable HTTP/2 Support in AWS ELB

Image
This thread  was started more than a year ago, asking for when Amazon Web Services will add support for HTTP/2  into their ELB. In addition to that, people are also asking, how to configure ELB to support multiple SSL certificates. AWS support team has been reluctant on giving out any specific details on when both of these features will be available, citing: I've verified that the ELB team is aware of the interest in ELB supporting HTTP/2. Please keep an eye on What's New from Amazon Web Services: http://aws.amazon.com/new/ for any updates. What is HTTP/2? HTTP/2 is a replacement for how HTTP is expressed “on the wire.” It is not a ground-up rewrite of the protocol; HTTP methods, status codes and semantics are the same, and it should be possible to use the same APIs as HTTP/1.x (possibly with some small additions) to represent the protocol. HTTP/2 protocol is supported by major modern browsers including IE11, Edge 13, Firefox 47, Chrome 52, Safari 9.1, Opera 38, i
Read more

How To Attach Your EBS volume to multiple EC2 instances

Image
Are you exhausted from the complexities and the extra cost associated with the EFS? What if you simply need to share the EBS volume between two EC2 instances? Say no more - Amazon Web Services has an answer for you! Starting today, customers running Linux on Amazon Elastic Compute Cloud (EC2) can take advantage of new support for  attaching  Provisioned IOPS ( io1 ) EBS volumes to  multiple EC2 instances , at  no extra charge ! Multi-Attach option in EBS According to AWS, the Multi-Attach capability makes it easier to achieve higher availability for applications that provide write-ordering to maintain storage consistency. Consider the following scenario: you are running a web application behind the load balancer, and the application expects static assets, such as WordPress media uploads, theme or configuration files, shared between the instances. Instead of using EFS, you could create new PIOPS EBS volume with the Multi-Attach option, mount the volume on each s
Read more