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LVM is a great tool to manage hard disks on Linux—you can abstract the hard drives away and manage logical volumes from volume groups, you can dynamically add or remove hard drives while the file systems on the logical volumes need not to backed up and recovered, and you may [...]
Fri, Aug 15, 2014, Continue reading at the source
Ctrl keys are important and possibly most frequently used in Emacs. However, it is painful on today's common PC keyboards since Ctrl keys are usually in the corner of the keyboard main area. Why the key mappings in Emacs are designed like this? After it was designed, Emacs was commonly [...]
Wed, Jul 30, 2014, Continue reading at the source
git merge is frequently used during development of projects managed by git. There are many common questions about git merge and I find most are solved and discussed on StackOverflow. Here, I summarize useful ones so that others who want to learn git merge need to do the search again. [...]
Mon, Jul 28, 2014, Continue reading at the source
In this post, creating a file-backed virtual block device (VBD) and installing Fedora 20 in the Xen DomU via internet will be introduced. This domain is created on a Fedora 20 Dom0 as introduced in Installing Xen on Fedora 20 as Domain-0. For better performance, you may consider using LVM [...]
Mon, Jul 28, 2014, Continue reading at the source
I ever introduced Installing Xen on Fedora 17 as Domain-0 as the first try to use the xen package delivered from Fedora and get away from manually compiling Xen and patching the kernel. In this post, I introduce installing Xen Dom0 on Fedora 20. Installing Xen First, install the xen [...]
Fri, Jul 25, 2014, Continue reading at the source
It is common to set up git servers to host git repositories. Branching is lightweight in git and a very friendly mechanism to manage code. Here, I summarize a cheatsheet of common git branching commands for working on repositories from a git server. This post assumes that you have basic [...]
Thu, Jul 24, 2014, Continue reading at the source
It is continuously discussed that some Fedora users do not like the font rendering in Fedora Linux and there are solutions to improve the font rendering with potentially non-free or non-licensed software/fonts. However, with only the open source fonts and software and little tricks, the font rendering on Fedora can [...]
Wed, Jul 23, 2014, Continue reading at the source
I summarize some commonly used commands that I find useful for working with git submodule. For the list of full commands, check the git submodule manual. In the following commands, I take scala-mode2 as an example as the submodule. Add a submodule git submodule init git submodule status git submodule [...]
Thu, May 29, 2014, Continue reading at the source
It seems thunderbird automatically wrap lines by 72 characters. How to make thunderbird not wrap lines automatically? First, open the “config editor”: go to “Edit | Preferences”, select the “Advanced” panel, select the “General tab”, and click “Config Editor…”. In the config editor, search for mail.compose.wrap_to_window_width and change it value [...]
Thu, May 29, 2014, Continue reading at the source
Programs may want to catch the kill signals sent by the kill command in C programs on Linux so that it can gracefully shutdown itself before it is killed. For example, I have a daemon progd running, and it may be killed by pkill progd. The progd may want to [...]
Thu, May 29, 2014, Continue reading at the source


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