high-availability

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!

Continue reading...
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:

Continue reading...
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:

Continue reading...
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.

Continue reading...
13th February 2014

in High Availability

Load Balancing RSA SecurID

Posted by Jake Borman 13th February in High Availability

When the friendly folk down at RSA contacted me requesting a test load balancer for a new project the dollar signs in my eyes were glowing for all to see.

Continue reading...
12th February 2014

in High Availability

Cluster recovery made easier

Posted by Rob Cooper 12th February in High Availability

Loadbalancer.org has always given high-availability the utmost priority in its product design. However prior to v7.6, cluster recovery (i.e. re-synchronized master & slave appliances after a cluster failure) without downtime was a slightly convoluted process that while possible - was not simple. Loadbalancer.org support staff often recommended a full heartbeat restart on both nodes as the simplest solution even though it involved a small amount of downtime. We've made a big effort to ensure that this process in V7.6 is as simple as possible in the rare event of a cluster hardware or software failure.

Continue reading...
17th May 2013

in Disaster recovery

Some small changes to default settings make achieving high availability easier…..

Posted by Malcolm Turnbull 17th May in Disaster recovery

Loadbalancer.org has always been about high-availability, that is the fundamental reason for our products existence. Performance has always been a nice side effect while maintainability of your application cluster is generally a key sub-set of the primary high-availability objective. However it's time for a confession, the default settings for the Loadbalancer.org appliances in a cluster configuration up until v7.5 have been set by default  for both ease of use and certainty of a valid configuration. The default recommendation for setting up or disaster recovery on the high-availability of the cluster (Heartbeat) has been to force a full sync and therefore inflict a small amount of down time in a maintenance window. Whilst we've always had documentation showing how to handle cluster maintenance and configuration with zero downtime it was definitely time for a change.

Continue reading...
12th November 2012

in HAProxy

Setting up HAProxy with Transparent Mode on Centos 6.x

Posted by Andrei Grigoraş 12th November in HAProxy

Transparent mode with HAProxy allows you to see the IP Address of the clients computer while still having a high availability service using HAProxy. This posting shows how to setup a blank virgin installation of Centos 6.3 64bit minimum installation.

Continue reading...
12th September 2012

in High Availability

Loadbalancing an internal webserver behind two Microsoft TMG 2010 servers at layer4 using DR mode

Posted by Theo Harvey 12th September in High Availability

We were looking at Microsoft's new TMG server and load balancing and after a search of the web found there was not really any Guide on how to load balance incoming web connections via two TMG servers to an internal NAT'ed web sever at Layer 4. The TMG servers are effectivley acting as WAFs (Web Application Firewalls) for the incomming traffic. They require the traffic to be transparent (so they can inspect the client source IP address), so layer 4  DR mode is a logical choice. The main problems were getting the required loopback adapter on the TMG servers to function correctly. So this is how we got it to work:

Continue reading...
19th June 2012

in Business

Updating your Version 6.X Loadbalancer.org Hardware

Posted by Mark Brookes 19th June in Business

Yes its true! Feel free to rub your eyes, do a double take, reload the page, get a cup of coffee to wake yourself up then reload the page again. ITS FINALLY HERE! Version 8.0.1 is available for your hardware Loadbalancer.org appliances!

Continue reading...
6th September 2011

in High Availability

Load balancing Microsoft Print Server

Posted by Rob Cooper 6th September in High Availability

Microsoft print server provides a great way to share printers throughout your organisation, but when the print server service falls over, the phone quickly starts to ring. By adding a load balancer and a second print server configured with the same print queues , you'll quickly have a load balanced and resilient printing infrastructure for your users.

Continue reading...
15th July 2011

in High Availability

NTLM Authenticating Proxy Check Script

Posted by Mark Brookes 15th July in High Availability

We do quite a bit of work with web proxy vendors, load balancing multiple web filters/proxies with our appliances and our customers have requested a way of health checking through the proxy when they have NTLM authentication enabled. Always happy to help where we can, I have created a script that will retrieve a web page via your proxy (logging in first of course) if it retrieves it successfully then the program exits with a code 0, if it fails it exits with a code 1. Simple!

Continue reading...
3rd October 2009

in High Availability

Loadbalancing FAQ (Frequently Asked Questions)

Posted by Malcolm Turnbull 3rd October in High Availability

This load balancing post is a little bit cheeky.. as its a bit of an experiment with catching Google's eye on the net, the Loadbalancer.org site does pretty well for the search term "Load Balancer"... but sucks big time for the second most popular term "Load Balancing"... Now I noticed that Loadbalancing.net gets a first search page result with no virtually zero relevant content so the domain name must help a lot!

Continue reading...
20th July 2009

in HAProxy

Transparent proxy of SSL traffic using Pound to HAProxy backend patch and howto

Posted by Malcolm Turnbull 20th July in HAProxy

OK so I've previously blogged about how to get TPROXY and HAProxy working nicely together. But what if you want to terminate SSL traffic on the load balancer in order to use HaProxy to insert cookies in the standard HTTP stream to the backend servers? Many thanks to Krisztián Ivancsó  for working on the TPROXY patch for Pound for us, we can finally do this!

Continue reading...
10th July 2009

in AWS

Loadbalancer.org – Now in the Cloud

Posted by Jake Borman 10th July in AWS

Over the last few months we'd experienced two fairly lengthly outages on our web server. It was a dedicated server with a UK host and we're not exactly sure of the reason for the downtime - could have been network failure, could have been the server crashing. It had become pretty annoying for us, and we realised that for a company touting the use of load balancers for High Availability, it is important that our own website should be up! Also, as Loadbalancer.org recieves traffic from every corner of the globe, we wanted to see what we could do to reduce latency to the farther-flung continents.

Continue reading...
12th March 2009

in High Availability

Loadbalancer.org guarantee 99.999% (5 nines) uptime to all of our customers.

Posted by Malcolm Turnbull 12th March in High Availability

Yeah right :-). Maybe after we sort out problems in our own back yard.... Our web server crashed again the other day (It last happened about 2 years ago). I was on holiday at the time and got an automated message saying "www.loadbalancer.org is toast!".  I thought OK thats annoying but not the end of the world, but it was a Sunday afternoon and about an hour later I got a message from one of our support guys saying that they could not get through to the 24*7 support engineers to look into the server failure. Thats when I remembered that last time this happened I thought about setting up a mirror dedicated server to save downtime in the event of a re-build being required... oops didn't do  that did I?

Continue reading...
Live chat
› Operator: Theo › Theo: Can I help you?
Click here to chat |
Send