MySQL MultiMaster Replication

September 28, 2011 mohancheema 0

You may know about the MySQL Cluster, which is a complex architecture to achieve high availability and performance. One of the advantages of MySQL Cluster is that each node is a peer to the others, whereas in a normal replicating system you have a master and many slaves, and applications must be careful to write only to the master.

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Recover from Failed Amazon EC2 Instances

August 9, 2011 mohancheema 0

One of the things that’s not immediately obvious about Amazon EC2 instances is that they could fail, in fact Amazon says:

It’s inevitable that EC2 instances will fail, and you need to plan for it. An instance failure isn’t a problem if your application is designed to handle it.

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Adding more disk space (EBS volumes) to your instance

August 3, 2011 mohancheema 0

Adding more disk space (EBS volumes) to your instance

The AWS Server AMI comes with an attached 30 GB EBS volume. If you need more space, you can create additional volumes and attach them to your EC2 instance.

The steps below explain how to create a new EBS volume and attach it to your EC2 running instance.

Amazon ELB SSL Termination HowTo

July 21, 2011 mohancheema 0

We’ve been using the new Amazon Load Balancers (ELB) for some of our websites, since there’s not much information out there on the subject, I thought a post would be in order.

The load balancers are charged at $0.025 per hour, plus $0.008 per GB of data transferred through them. Personally I think this is very reasonable.

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Advanced MRTG HowTo

April 28, 2010 mohancheema 4


In many cases using MRTG in a basic configuration to monitor the volume of network traffic to your server isn’t enough. You may also want to see graphs of CPU, disk, and memory usage. This chapter explains how to find the values you want to monitor in the SNMP MIB files and then how to use this information to configure MRTG.