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Download of the day: OpenBSD 4.2 CD ISO Image

OpenBSD 4.2 has been released and available for download. OpenBSD is famous for its focus on security. Today, November 1st, the team is proud to announce Release 4.2.

Even though security is still there, this release comes with some amazing performance improvements: basic benchmarks showed PF being twice as fast, a rewrite of the TLB shootdown code for i386 and amd64 cut the time to do a full package build by 20 percent (mostly because all the forks in configure scripts have become much cheaper), and the improved frequency scaling on MP systems can help save nearly 20 percent of battery power.

And then the new features: FFS2, support for the Advanced Host Controller Interface, IP balancing in CARP, layer 7 manipulation with hoststated, Xenocara, and more!

Download OpenBSD ISO

=> For greater convenience, the new 4.2 release also comes with roughly ~200MB full install ISO images called "install42.iso". If you download this file, you do not need the other standard install files. Select

Also, Federico Biancuzzi interviewed 23 developers and assembled this huge interview...

Download of the day: Solaris 10 update 8/07 CD / DVD ISO

Solaris 10 update 8/07 has been released and available for download. From the announcement page:
The latest update of the Solaris OS helps customers alleviate common enterprise problems such as virtualization, resource management, and system performance. Solaris delivers built-in investment protection and new technologies that are even better suited to data intensive environments where price and performance are driving factors:

New updated features

=> Solaris Containers for Linux Applications and integrated support for Logical Domains
=> Update to the performance-optimized and cost-effective PostgreSQL open-source database software.
=> Ability to run multiple independent network stacks on one system
=> Networking and DTrace technology enhancements

Best of all, it's free to download and use. The only thing customers pay for are the support and services, which range in scope and price to suit the needs of individual developers and companies of all sizes.

Download Sun Solaris 10 UNIX CD / DVD ISO

=> Visit official site to download Solaris ISO images.

Linux increase number of loop filesystems allowed to be mounted simultaneously

You can mount DVD / CD iso images using loop module under Linux (Sun Solaris UNIX user can try out lofiadm command) . It would be good idea to increase the number of loop filesystems allowed to be mounted simultaneously by adding the following line to /etc/modprobe.conf file:

Task: Set maximum number of loop devices

Open Linux kernel module configuration file using text editor:
# vi /etc/modprobe.conf

Append loop module configuration parameter:
options loop max_loop=256

=> loop : module name

=> max_loop=256: Maximum number of loop devices (1-256)

This is useful on dedicated installation server. For example internally we have over 5 Linux distro ISO downloaded with new and old version number. We use iso for HTTP or FTP installation over LAN. By increasing limit to max you can avoid problems.

Howto: Verify Downloaded Linux / BSD DVD or CD ISO images for integrity

You need to verify that that downloaded Linux DVD or ISO images are intact before you burn and use them. This is security feature. But how do you verify ISO images?

Answer is quite simple use md5sum command to compute and check MD5 message digest.

Why verify ISO images?

a) To protect yourself
b) Verify that a file has not changed as a result of file transfer, disk error, cracker attacks, etc.

How does it work?

When you run md5sum command on ISO file, you get checksum (or hash) on screen. You need to compare this checksum with original. It works as a compact digital fingerprint of a file. You can then compare the MD5 hash of your download ISO file, to the known good hash of the file you are checking. If the two values match, you are safe and use the ISO image.


Let us download FreeBSD ISO image:
$ cd /tmp
$ wget ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ISO-IMAGES/6.2/6.2-RELEASE-i386-bootonly.iso

Next download MD5 checksum:
$ wget ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ISO-IMAGES/6.2/CHECKSUM.MD5

Generate MD5 hash for ISO image

$ md5sum 6.2-RELEASE-i386-bootonly.iso

4e8701ac951bc4537f8420fdac7efbb5  6.2-RELEASE-i386-bootonly.iso

Verify ISO image

See the known good hash of the file (6.2-RELEASE-i386-bootonly.iso):
$ md5sum -c CHECKSUM.MD5

6.2-RELEASE-i386-bootonly.iso: OK

You can also use following command for the same purpose:

A note for Windows XP / Vista users

Download of the day: e tool to extract rpm, rar, zip and other formats under Linux

Sure you can use unzip, unrar, and other tools to extract files under Linux. e is little tool that can extract almost any archive in Linux so you do not need to remember which tool and what command lines are necessary.

You need ruby lanaguage installed on your computer to use this tiny tool. Apart from Ruby, e uses the linux tool file to determine what kind of archive it is dealing with. This tool should be available on any proper Linux installation. Once e knows the archive type, the appropriate extraction tool is executed.

You can read more about this tool, installation and other notes at Martin Ankerl blog.

See also

Download of the day: Fedora 7 CD / DVD ISO

Update: Nov-25,2008: Fedora Linux 10 has been related and available for download.

Update: Nov-7,2007: Fedora Linux 8 has been related and available for download here.

Fedora 7 has been released. The Fedora Project is a Red Hat sponsored and community supported open source project. Its goal is the rapid progress of free and open source software and content. It offers cutting edge softwares for desktop usage. The latest version of the popular Linux distribution has a lot to offer users and developers.

New in Fedora 7

=> This release features GNOME 2.18 and KDE 3.5.6.

=> This release integrates Kernel-based Virtual Machine (KVM) technology with Fedora's graphical virt-manager and command-line virsh tools. KVM provides a hardware accelerated virtualization solution, and users have a choice between KVM and Xen, along with Qemu, in this release.

=> In this release, the performance of yum, Pirut, and Pup have been significantly improved.

=> This release features integration of a new FireWire stack in the kernel for more robust device handling.

=> Fedora now includes improved power management through implementation of dynamic ticks in the kernel.

(click to enlarge, more screenshots @ Fedora Website)

=> I can now install Fedora on my Sony VAIO Notebooks

=> See Fedora 7 release notes.

Download link - ( Download Fedora )

Download of the day: Fedora Core 7 CD / DVD ISO
You can download Fedora via the web/ftp server or via BitTorrent (recommended).

Fedora 7 DVD ISO download

= > Visit mirror to download Fedora ISO images (2.7 GB)

Fedora 7 Live CD ISO download

=> Use Live CD (700M) if internet connection is slow or you just want to see how Fedora works. You can install fedora from Live cd.

Fedora 7 DVD ISO BitTorrent download

=> Download from BitTorrent (requires a BitTorrent client)

Howto Setup yum repositories to update or install package from ISO CDROM Image

yum (Yellow dog Updater Modified) is a package manager for RPM compatible Linux systems such as CentOS, Fedora core and latest Redhat Enterprise Linux.

So how do you use yum to update / install packages from an ISO of CentOS / FC / RHEL CD?

Creation of yum repositories is handled by a separate tool called createrepo, which generates the necessary XML metadata. If you have a slow internet connection or collection of all downloaded ISO images, use this hack to install rpms from iso images.

Step # 1: Mount an ISO file

Type the following command (replace iso file name with the actual iso file):
# yum install createrepo
# mkdir -p /mnt/iso/{1,2,3}
# mount -o loop /path/to/centos1.iso /mnt/iso/1

Step # 2: Create a repository

Use createrepo to generate the necessary XML metadata. Type the following commands:
# cd /mnt/iso
# createrepo .

Clean repo, enter:
# yum clean all

Step # 3: Create config file

You need to create a repo config file in /etc/yum.repos.d/ directory.
# vi /etc/yum.repos.d/iso.repo
Append following text:
[My ISO Repository]

Save and close the changes.

Now use yum command to install packages from ISO images:
# yum install package-name