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As Debian v7.0 Wheezy has been released for a while, we will show how to upgrade from v6.0 Squeeze here step by step. Before any operations, it’s highly suggested making a backup, as least for data files and configuration files…

As system administrators, we’d better know SystemTap and be able to assemble its existed recipes for comprehensive system analysis. When I am on my way to make a collection of  systemtap scripts, I realize that I should give a brief…

Note that this is a forwarded version from serverfault.com, and the original post is here.  Xen is an hypervisor that runs on metal (the pc / server) and then hosts virtual machines called domains.

You may have heard of Netperf, which is a benchmark tool that is used to measure the performance of many different types of networking.  But normally what we care are the throughput and latency. As the throughput may affected by…

As from OpenSSH-4.4, we can add command-line args for the sftp-server subsystem configuration. When combined with these arguments, it allows us to log what is performing during an SFTP session. Be aware that there is a bug in enabling the…

As long as you are all right with a little downtime of the EC2 instance (in a few minutes), it is possible to extend the root partition on a running EBS boot EC2 instance, without needing to start a new…

From the topic above, you may have remembered one of our former post “what data is cached by operation system“. This is a similar tool as Fincore, but it’s more powerful. It’s written in C and supports UNIX and unix-like systems.

When using Amazon S3 to store the web files, you may face this question sometimes, How can I keep the files for my productive environment exactly the same as develop environment? (In other words, you want to remove the unused…

If you use Amazon S3 (or CloudFront) as a web hosting provider, here are some essential tips that you should know about. These tips are mainly for front-end optimizations, including reduce S3 bandwidth, reduce unnecessary requests to S3, check abnormal…