Features/Ksplice Uptrack rebootless updates
Ksplice Uptrack rebootless kernel updates
Keep Fedora's kernel up-to-date without rebooting. This uses the Ksplice Uptrack service to safely update the running kernel in memory, making it more convenient to stay on top of security and other important kernel updates.
- Name: Keith Winstein
- Email: firstname.lastname@example.org
- Targeted release: Fedora 14
- Last updated: July 19, 2010
- Percentage of completion: 100%
Ksplice Uptrack allows system administrators to update the running Linux kernel "rebootlessly," using technology first developed at the Massachusetts Institute of Technology. Fedora and other major Linux distributions generally ask their users to reboot roughly once a month to install a new kernel to fix security and reliability issues. Empirically, users rarely install such updates -- Ksplice has measured real-world compliance at about 20% -- and until a system can be updated, it remains vulnerable to security flaws. By allowing IT administrators to install kernel updates without downtime, Uptrack dramatically reduces the cost of system administration and boosts adherence to security updates to greater than 95%.
Ksplice Inc. will supply rebootless versions of the kernel updates Fedora distributes. The service will be free of charge. The client software is licensed under the GNU General Public License, version 2.
Benefit to Fedora
Fedora will gain the capability to apply important kernel updates without the disruption and downtime of a reboot. This will boost the security and reliability of systems that choose to install such rebootless updates. Fedora will become the first Linux distribution to integrate rebootless updates into the distribution.
A package of client software conforming to the Fedora Packaging Guidelines has been submitted for review (https://bugzilla.redhat.com/show_bug.cgi?id=616251).
The service is already operational in a preview for Fedora 13, and will begin supplying Fedora 14's kernel updates as soon as the kernel stabilizes.
How To Test
The Uptrack service is currently available for testing on Fedora 13. To test, please install the ksplice-uptrack RPM on a Fedora 13 system running an old version of the kernel. The client software will alert the user that there are rebootless updates available and will prompt the user to install them. After installation, the "uptrack-show" command will show the patched CVEs, and exploits written against vulnerabilities patched by the updates will no longer work. There should be no visable disruption of the machine while updates are being installed.
The client software installs a panel widget to alert the user of the availability of rebootless kernel updates, prompting them to install updates as soon as they are available. The Ksplice software suppresses Fedora's notification instructing the user to reboot after the on-disk kernel has been updated. Users will continue to update their kernels on-disk using the package manager, and will boot into the new kernel after a reboot -- but they will no longer be instructed that a reboot is required.