Fedora does not include MPlayer or MEncoder for some reasons in its official repositories. But RPMfusion does it for us. Let’s install mplayer and mencoder and learn some tricks to play rmvb files. 1. Add RPMfusion repository: Enable RPM Fusion repositories 2. Install MPlayer and MEncoder # dnf install mplayer mencoder 3. Get codecs Most…
Sharing the networking is important and setting up a gateway is a good solution to it. Building up the gateway on a Linux box is easy, cost efficient and reliable. With a Linux box, you can share the internet connection or the only cable connected to the network. The Linux box network configuration The Linux…
For most of cases, you should not disable SELinux. However, for some users, SELinux may cause problems or is not needed. We may just make it not block operations or totally disable it. Making SELinux log warnings instead of blocking For many cases, people find SELinux blocks operations. For tests or some other situations, you…
We can set up a socks proxy on top of a SSH tunnel. Besides the common proxy functions, such as web browsing, the proxy on top of SSH tunnel also ensures the security between the browser and the proxy server (the SSH server). In this post, we introduce and explain how to set up a…
Previously, we create a configuration file for each DomU virtual machines in our cluster. Most of the content in these configuration files is the same. The differences are only the name, memory size and image file address. There are several disadvantages of this method: We must create and configure a new configuration file when creating…
Sometimes we need to have the GUI of some application on the remote server. ssh’s X11 forwarding with “-X” parameter is a good and fast method. But if we want to have a whole desktop environment, vnc is a good choice. In this post, the method of how to control remote server using vnc through…
We may need to flush DNS cache of our client when the site’s DNS has been changed. Flush DNS cache of Linux with NetworkManager/dnsmasq You may simply restart NetworkManager by sudo systemctl restart NetworkManager Flush DNS Cache on (Old) Linux with nscd 1) Use su – to get root privilege or sudo with the following…
Assumption: There are VBD based Xen DomU virtual machines stored under /home/xen/vm-f11-sample/. There are two files under vm-f11-sample: vm0-f11.run (The configuration file) and vmdisk0 (The virtual disk). Now we want to duplicate the virtual machine vm0 stored under vm-f11-sample to vm-10.0.0.213 which is stored under vm-10.0.0.213. And vm-10.0.0.213’s ip will be 10.0.0.213. The steps to…
Git and SSH are both powerful tools, and git/ssh work well together. We introduce how to set up git server via ssh in this post. Git server through SSH is easy and fast to set up, although every user will have access to all repositories in the git server over SSH and every user is…
DVD disks are still commonly used in some areas while the disks are not fast and convenient enough for frequent usage. For frequent usage or archiving, an image of the DVD on hard drives will be better. ISO images do not use a particular container format. They are just a sector-by-sector copy of the data…
How to speed Up Firefox DNS Lookup in Linux: 1. Close IPV6 support # echo “alias net-pf-10 off” >> /etc/modprobe.conf # echo “alias ipv6 off” >> /etc/modprobe.conf Type “about:config” into the address line and enter. Set “network.dns.disableIPv6” to “true” 2. Some other tweaks Type “about:config” into the address line and enter. Set “network.http.pipelining” to “true”…
How to configure NetworkManager to connect to sMobileNet in HKUST is introduced in this post. The wireless network connection configuration for sMobileNet in NetworkManager The SSID is “sMobileNet” Wireless security is “WPA & WPA2 Enterprise” Authentication is “Protected EAP (PEAP)” Anonymous identity is “” (empty) CA certificate is “(None)” (there will be a warning appear,…
Linux has many tools for mounting, creating and burning iso image files. In this posts, I will introduce how to use the iso files on Linux. The tools we used in this post are mount, genisoimage and wodim. 1. Mount an iso image file Mounting an iso on Linux is straightforward. We mount the iso…
WordPress is so missed for many great features and plugins. Hence, we moved the site back to the WordPress system on Jul. 12, 2013. MediaWiki is great but, for this site, WordPress is a better solution. The so missed features of WordPress Related posts via the YARPP Plugin. URLs without strongly mapped to the title…
We may want to run some jobs for every two weeks/months/days… under some situation such as backing up for every other week. In addition, we may add more complex rules for running jobs, e.g. run a command when the load of the server is higher than a certain level. With the help of the shell…
Compress/uncompress files are frequent operations. The normal tools for compressing/uncompressing in Linux is gzip, bzip2, 7z, rar and zip. This post introduces how to compress and uncompress file in Linux using these tools. We use best compressing rate with all these tools and mark the options for “best rate” in bold fonts. We can delete…
TeraSort is one of Hadoop’s widely used benchmarks. Hadoop’s distribution contains both the input generator and sorting implementations: the TeraGen generates the input and TeraSort conducts the sorting. Here, we provide a short tutorial for using the Hadoop TeraSort benchmark. TeraGen generates random data that can be used as input data for a subsequent running…
Research on Cloud Computing has made big progresses and many excellent large-scale systems have been designed in recent years. I compiled a list of some large-scale data storage and processing systems in datacenters as follows. Storage systems Google File System (GFS): http://research.google.com/archive/gfs.html HDFS implementation: https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html Colossus (GFS2): Colossus: Successor to the Google File System (GFS)…
Update: If you are new to Hadoop and trying to install one. Please check the newer version: Hadoop Installation Tutorial (Hadoop 2.x). Hadoop mainly consists of two parts: Hadoop MapReduce and HDFS. Hadoop MapReduce is a programming model and software framework for writing applications, which is an open-source variant of MapReduce that is initially designed…
How to manage users and repositories and how to use these repositories will be introduced in this post. Please refer to Setting Up a Git Server Using Gitosis for how to set up the git server. Please refer to Howto for New Git Users for how to use git as a new user. Create a…