high availability

1st July 2016

in Disaster recovery

Seamless Load Balancer Recovery – as easy as 1, 2, 3

Posted by Rob Cooper 1st July in Disaster recovery

So, you've configured two loadbalancer.org appliances as a clustered pair for high availability, the pair has been working fine but then one day you receive an email alert that one of the pair has failed for some reason, for example a disk failure. The remaining unit continues to provide load balanced services without issue, but now you want to repair the failed unit and re-create the clustered pair without any disruption to running services.

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11th May 2016

in AWS and Azure

Integrating your load balancer with auto scaling groups in EC2 (Amazon AWS)

Posted by Ben Cabot 11th May in AWS and Azure

Amazon's auto scaling feature is a great tool to ensure that you always meet your desired server capacity. This helps you keep up with the demand from your users while keeping costs down. Amazon's ELB ties in well with auto scaling groups automatically load balancing servers that have been brought up as the result of an auto scaling action. However some people require more from their load balancer than ELB can provide.

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19th August 2015

in High Availability

Why do I need two load balancers?

Posted by Malcolm Turnbull 19th August in High Availability

This question was asked a lot more frequently 10 years ago. In fact we were asked it so often that we used it as the title on the home page for that very reason. It amazed me that people would go to all the effort of configuring a cluster of multiple application servers but only use ONE load balancer! That's just plain stupid.

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29th May 2015

in Disaster recovery

Backups, Backups, Backups!

Posted by Dave Saunders 29th May in Disaster recovery

Every system administrator, infrastructure manager and experienced user knows the importance of having current backups available... just in case! The security of knowing you have an up-to-date version of the configuration can be worth it's weight in gold when it is needed - be it a machine failure, unexpected issues following system change or even a full blown disaster recovery scenario - when time is of the essence, a lot of stress can be removed by having your configuration available and it will also reduce the downtime of your environment significantly. So the decision on which method is best for you and your Loadbalancer.org appliance... To be honest it's very simple; a copy of the Loadbalancer.org install image, SSL certificates and your support download archive* - Done!

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1st December 2014

in Business

Black Friday black out protection with HAProxy

Posted by Malcolm Turnbull 1st December in Business

The media industry had lots of fun at the expense of e-commerce outlets on Black Friday mercilessly reporting on site crashes and outages . My wife yelled that I needed to 'fix the Internet' when Argos.co.uk would not respond immediately to her demands on Friday evening. However on closer inspection i.e. reading the page Agros was handling the situation in a very fair and simple way. The holding page displayed apologised because the site was very busy, and within about 2 minutes it let her into the web site to start shopping (nice little Javascript re-direct built into the sorry we are busy page). If you need to implement this kind of functionality for your e-commerce site then it is pretty simple to do with the Loadbalancer.org appliance:

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29th September 2014

in High Availability

Loadbalancer.org product roadmap (as always a work in progress)

Posted by Malcolm Turnbull 29th September in High Availability

Understandably we get quite a few requests for a product road map. We've had a chat about this internally and thought that it would be nice to have a permanent post on the blog that we change on the fly as customer requirements change. Putting this on the blog enables our customers to express their arguments for and against new features etc. This entry should also give you a better idea of our priorities and how we develop the product:

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20th August 2014

in High Availability

Enhanced Microsoft IIS health checks using VBscript

Posted by Rob Cooper 20th August in High Availability

By default, the load balancer uses a TCP connect to the port defined in the Virtual Service to verify the health of each real (backend) server. For IIS, this would typically be port 80. In many cases this kind of health check is adequate but for IIS this is often not the case. When a particular IIS site is stopped, whilst it's not possible to perform an HTTP GET, it's often possible to still be able to perform a TCP connect to the port. This means that this basic type of health check cannot be relied on for IIS. The load balancer can be configured to perform a more comprehensive HTTP negotiate check which verifies that IIS can actually serve web content and this is sufficient in most cases. However, you may also want to check that other applications and services are running correctly before reporting that the server is OK. Microsoft VBscript is a powerful tool that can be used to do exactly this.

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