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Archive for the 'File system' Category

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• Install and Run Debian Linux from an Encrypted USB Drive

  Another interesting article with security in mind. From the article:
  You’re probably familiar with the live CD concept — a fully functional operating system on a CD that can be run on any computer that boots from its optical drive, without affecting the one(s) already installed. In a similar vein, you can set up Linux to [...]

• Linux Xen High Availability Clusters Configuration Tutorial

  Xen is one of the leading Virtualization software. You can use Xen virtualization to implement HA clusters. However, there are few issues you must be aware of while handling failures in a high-availability environment. This article explains configuration options using Xen:
  The idea of using virtual machines to build high available clusters is not new. Some [...]

• Download of the day: atool for Managing File Archives of Various Types

  atool is a script for managing file archives of various types such as .zip, tar.gz and all other formats. From the article:
  Atool uses other tools behind the scenes to perform the heavy lifting. With atool, you can handle any archive without having to remember what command-line tool to use to expand it and which [...]

• How To Track Changes in Your Linux Filesystem

  kfsmd is an interesting tool to keep track of changes in your filesystems. This tool based upon inotify which is a Linux kernel subsystem that provides file system event notification. Useful for file auditing. From the article:
  Applications can ask the Linux kernel to report changes to selected files and directories. I created the Kernel Filesystem [...]

• Building a Home File Server with FreeNAS ( FreeBSD based NAS Server )

  FreeNAS is a free Network-attached storage (NAS) server. It supports following protocols:
  => CIFS (Samba) - Mac / UNIX / Windows can use CIFS to store files
  => FTP
  => NFS
  => Rsync
  => AFP
  You can use local user authentication, and software RAID (0,1,5), with a web-based configuration interface.
  I’ve installed it on USB pen which takes less [...]

• Linux display disk total statistics including time spent reading and writing data

  Most Linux admins are not aware of hidden switch (undocumented switch) called -D. The -D option display a nice summery of disk I/O subsystem since boot time. Output includes total time spent reading and writing data, merged reads and merged writes (kernel disk i/o optimization technique) and other parameters.

• Clonezilla Ghost Like Linux Partition or Disk Clone Software

  You can easily clone single hard disk or partition using netcat and your own network. However, software such as Clonezilla offers a partition or disk clone software similar to Ghost. It saves and restores only used blocks in hard drive.
  Norton Ghost is popular proprietary commercial software. It is slow and takes lots of time [...]

• rssh: Per User Configuration Options For Chroot Jail

  rssh is a restricted shell for providing limited access to a host via ssh. It also allows system wide configuration and per user configuration. From the man page:
  The user configuration directive allows for the configuration of options on a per-user basis. THIS KEYWORD OVERRIDES ALL OTHER KEYWORDS FOR THE SPECIFIED [...]

• How do I find out Linux Disk utilization?

  I’ve already written about finding out Linux / UNIX cpu utilization using various tools. You can use same iostat command to find out disk utilization and for monitoring system input/output device loading by observing the time the physical disks are active in relation to their average transfer rates.
  iostat syntax for disk utilization report
  iostat [...]

• CentOS 5 Apache 2.2.3 files failing to download or corrupted download file issue

  Recently, I noticed something strange about Apache 2.2.3 version running on CentOS Linux 5 64 bit version. We have centralized NFS server and all 3 web server load balanced using hardware front end (another box running LVS).
  All Apache server picks up file via NFS i.e DocumentRoot is set over NFS. The small file such [...]

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