As I wrote different times before, RHEL6 is going to have a Kernel based on upstreams 2.6.32 Kernel. Meanwhile Linus Torvalds and his fellows released 2.6.34. Since then – from a System Engineers Point of view – there have some “minor” changes which are affecting the daily work in enterprise environments. I think that Red Hat is aware that RHEL6 is one of its most important releases made so far. RHEL6 Beta-Testers have acknowledged that this is one of the ….Read More
Category: Linux
Red Hat’s virtualization strategy has redundancy – Quo vadis?
A couple of days there have been some reports that Red Hat will release a commercialized version of deltacloud, an abstraction layer for different kinds of virtualization technologies and clouds such as VMware, RHEV, Amazon EC2 etc. Red Hat puts a lot of resources on virtualization, they maintain and/or sponsor multiple projects in parallel. The most important from my point of view is libvirt which is as well an abstraction layer for different virtulization technologies such as VMware, KVM, Xen ….Read More
IUS Community RPMs for Red Hats RHEL
I was criticizing that software in RHEL is too outdated for web servers quite soon after release, see my blog post http://blog.delouw.ch/2010/05/02/rhel6-as-a-web-server/. While this is true for a system fully supported by Red Hat, I learned an alternative from a comment on the post. This alternative is the so called IUS community repository. About the IUS Community Project The project was launched in September 2009. In spite of being a young project, it has a history. At Rackspace, a large ….Read More
KVM supports live migration between CPUs with different features
The video is a bit old, it is from November 2008. But it is still quite interesting to see and discuss about it. With KVM you can upgrade your farm of servers easy, it does not matter if the new servers have CPUs with new features or not. I’m not sure if you can do this with ESX, I guess not, you probably need to migrate them shut down. httpvh://www.youtube.com/watch?v=EuhU6jJjpAQ Have fun!
RHN Inter-Satellite-Sync is kind of tricky and picky
If you try to establish an ISS (Inter Satellite Sync) between two RHN Satellites, do not fully trust the documentation. A slave Satellite must be named by a hostname (IP is not enough) and must have an A and a PTR DNS record or have an /etc/hosts entry. Check it before restarting the satellite by issuing rhn-satellite restart. The check is simply done by entering gethostip rhn.example.com and getent hosts <IP-address> on the commandline. When Quoting the documentaion at Red ….Read More
Spacewalk 1.0 released
Spacewalk 1.0 has been released Spacewalk is the upstream project for Red Hat’s RHN Satellite software, one of the best systems management software available for Linux Systems. In the past few weeks one could see a lot of git commits on the source repository of spacewalk. There is no changelog available yet. The road map mentioned compatibility with Apache Tomcat 6.0.x to be able to install spacewalk on Fedora12 and RHEL6. There should have also been several enhancements in the ….Read More
Writing trigger scripts for cobbler does not work at the moment
At the moment, shell scripts as triggers wont work with cobbler. This is due to a bug. Unfortunately the developers wont fix it in the next few weeks or even months. Triggers are a very welcome and powerful method to automate things before, during after installation of a system. At the moment it only works with python scripts. Since not every sysadmin knows python, but everyone knows to write bash scripts, this is a major drawback. Cobbler is included in ….Read More
Ubuntu 10.04 LTS released
End of April 2010, Ubuntu 10.04 was released. As always it is based on Debian’s Testing-Release. Canonical “stabilizes” the testing tree of Debian and adds its own look. This time, Ubuntu radically changed its look. From my point of view it looks ugly, very ugly. Strange colors, low contrasts in menus, orange icons in Nautilus… window buttons on the left side… At the end of the day an usability-horror. Under the hood Ubuntu is a very stable distribution with recent ….Read More