Two days ago, the Linux Foundation announced a new certification program.

It consists in two exams:

• LFCS (Linux Foundation Certified System administrator),
• LFCE (Linux Foundation Certified Engineer).

Both exams are performance-based exam in English lasting 2 hours focusing on system administration and costing $300 ($50 until 24/8).

Candidates can choose between 3 Linux distributions (CentOS 6.4, OpenSUSE 13.1 and Ubuntu 14.04) before the beginning of the exam.

Compared to the RHCSA6 exam, the new LFCS exam on Centos 6.4 requires additional sudo, backup/restore and Raid configuration skills.

Similarly, compared to the RHCE6 exam, the new LFCE exam on CentOS 6.4 requires additional Apache SSL, Squid and IMAP/IMAPS configuration skills.

Time will tell us if this new Linux Foundation certification program can get some success.

Some applications writing files in the /tmp directory can see huge improvements when memory is used instead of disk.

You will find all the details in the tutorial about configuring /tmp on tmpfs.

If you don’t know the kpartx command, you miss something!

If you regularly play with virtual machines under KVM, you know that sometimes things go wrong.
A change in the /etc/fstab file or in the ssh configuration and you are in trouble, you can no longer access your virtual machine because you hadn’t set any virtual console: you need to reinstall it and it’s not fun!

But there is a solution! I call it emergency procedure.

This solution consists in stopping your virtual machine with the destroy command, then map your virtual machine image file in your physical host environment with the kpartx command. Mount the /boot partition and edit your /boot/grub2/grub.cfg file, adding the console=ttyS0 string at the end of every kernel boot line.
Finally, unmount the /boot partition, unmap your virtual machine image and reboot your virtual machine: from now on, you’ve got your virtual console!

This tip works at least for RHEL 6/CentOS 6 and RHEL 7/CentOS 7.

To get all the details, go to the RHEL 7 virtual console page.

With Systemd, the Init scripts are not there any more. Consequently, the execution of tasks at boot time had to change.

Hopefully, a nice solution has been found: it uses the good old rc.local file.

Now, to execute tasks at boot time, you put them into the /etc/rc.d/rc.local file.

Then, you change the execution permissions on this file:

# chmod u+x /etc/rc.d/rc.local

Besides allowing executions of tasks, this simple operation activates the new rc-local Systemd service for all the further boots (this is like systemctl enable in Systemd language).

Finally, you can start the rc-local service and, this way, test the execution of the rc.local file:

# systemctl start rc-local

SSD optimization is a good example of such a rc-local service.

Just a reminder for RHCEv5: you’ve got still 29 days to get recertified by passing the RHCEv6 only (a 50% discount is available in some countries).

Today, CentOS 7 has just been released.
The distribution can now be downloaded from the CentOS website.
The Release Notes explain what kind of images are available:

• the DVD images contain most of the packages but not all,
• the Live media images are also stored on DVD and allow you to decide to install the distribution or not with a reduced number of packages,
• the Livecd image, stored on a CD, is a basic distribution,
• the Everything image contains all the available packages.

In addition, the CentOS 7 FAQ gives you some tips:

• How to activate your Ethernet network interface during the installation,
• How to keep the old network interface names,
• How to disable IPv6.

This is a good news for those who want to start to learn RHEL 7 but can’t afford to pay the fee.

Yesterday, there was a live chat organized by Red Hat on Twitter.
The subjects were RHEL 7 training and certifications.

Here is a retranscription:

• RHCSAv6 & RHCEv6 exams are available until December, the 19th but availability varies by location.
• According to location, RHCSAv6 & RHCEv6 can still be taken in exam centers or only in kiosk/onsite.
• A candidate with a current or future RHCSAv6 can become RHCEv7 by passing the RHCEv7 exam only.
• Red Hat recommends taking the RHCE Certification Lab, available as classroom, virtual training, & online, before taking the RHCEv7.
• According to location, a RHCEv5 can get a 50% discount to take both RHCSAv6 et RHCEv6.
• The RHCEv7 changes (4 hours instead of 2, more topics, etc) have been made based on input and guidance of Red Hat Certified Professionals.
• All kiosk exam environments are entirely local (no latency) and keyboards can be remapped if a localized keyboard is not already available.
• Other courses will be updated to RHEL 7 before the end of this year.
• It is still possible to (re)download a certificate/transcript (“Red Hat hereby certifies…”) for a RHCEv5.
• Courses on RHEL 7 have already started in North America.
• UK kiosk is available in Farnborough and a new London location is looked for.
• The opening of a kiosk in Poland is under consideration.
• RHEL 7 training material should be available in French within the Summer.

Today, the RHCSA & RHCE exam objectives for RHEL 7 are finally available.

Concerning the RHCSA exam objectives, there are very limited changes. Details are available in the RHEL7 RHCSA What’s new? section.

Concerning the RHCE exam objectives, changes are more significant. The exam now lasts 4 hours and numerous objectives have been added (and almost none removed). Details are available in the RHEL7 RHCE What’s new? section.

Ten days ago, Red Hat released more than 20 short technical videos about some facets of their new product. These videos are available on the Red Hat Enterprise Linux channel on YouTube.
They are also available broken down by topic in the Videos section of the RHEL7 Free available resources on this website.
Search for the “Red Hat” keywords ;).