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ATT Live 2012 Session Spotlight–Dr L’s CLP 11 Pain Points Sessions



By: dcoughanour

April 5, 2012 1:59 pm

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(Note: To see a list of all the sessions planned for ATT Live 2012, go to http://bit.ly/Asgjo4.)

At ATT Live 2012, Dr Bjoern Lotz, the designer and creator of the CLP 11 exam scenarios and evaluation scripts, will be presenting 3 sessions on the various common issues and mistakes that most often make the difference between passing and failing the SUSE Certified Linux Professional (CLP) 11 Practicum Exam. These sessions are:

  • Dr. L’s Treatment for the CLP Pain Points #1: Scripting in the CLP
  • Dr. L’s Treatment for the CLP Pain Points #2: NFSv4 and Syslog-ng
  • Dr. L’s Treatment for the CLP Pain Points #3: Apache and Samba

These sessions will be especially helpful for SLES 11 server administrators who want to achieve the SUSE CLP 11 certification. And ATT Live 2012 is a prime opportunity to get this certification because the CLP 11 practicum exam will be offered for free on days 3 and 4 of the event.

I asked Bjoern to provide a bit of useful information from each session that would give you an idea of what to expect if you’re interested in taking advantage of this opportunity to prepare for and take the CLP 11 exam. The following information is just a taste of what you’ll learn in these sessions. You’ll really need to come to ATT Live if you want the full learning experience–demonstrations, hands-on labs, interaction with the instructor, etc.

Scripting in the CLP

One of the common issues that comes up when performing scripting tasks in the CLP exam is that the script does not execute without errors. Among the steps you can take to make sure the script executes properly is to use the following script troubleshooting techniques:

If you do not immediately see why a script is returning errors, you can

  • Add set -x at the top of your script – when executing the script you see additional information that can help you find the error
  • Put echo in front of commands – that way they are not executed but displayed in the output
  • Put read into your script to pause it – hit enter to continue it
  • If you don’t want to run the whole script, put exit at the point where you want it to end
  • Don’t forget to remove (or change into a comment with #) the above when you are done

NFSv4 and Syslog-ng

The common mistakes made when performing Syslog-ng tasks in the CLP exam arise from not knowing how to create filters or modify existing ones. Filtering rules that will help you in performing these tasks successfully include the several criteria that can be used for filtering:

  • Facility:
    filter f_news { facility(news); };
  • Priority
    filter f_alert { level(alert); };
  • Program (regular expression)
    filter f_dhcpd { program(“dhcpd”); };
  • String (regular expression)
    filter f_firewall { match(“IN=”): };
  • Hostname (regular expression)
    filter f_gateway { host(gateway); };
  • Elements can be combined:
    filter f_errcrit { level(err, crit); };
    filter f_mailnews { facility(mail, news); };
    filter f_iptables { match(“IN=”) and match(“OUT=”) ; };

Apache and Samba

A common mistake seen in the exam related to the CLP 11 Practicum Apache tasks is there are missing elements in the virtual host configuration. Some tips to keep in mind to perform these tasks successfully are:

  • The configuration is distributed across several files in /etc/apache2/, including
    • httpd.conf
    • default-server.conf
    • vhost.d
    • listen.conf
    • error.conf
    • Some configuration options are contained in /etc/sysconfig/apache2, which are used to create configuration files in /etc/apache2/sysconfig.d/
  • Virtual hosts are used to provide the Web pages of several domains on one IP address
  • To create a virtual host, you need to create a configuration file in the /etc/apache2/vhsots.d/ directory
  • The file name has to end in .conf
  • The /etc/apache2/vhosts.d/vhost.template file lists the needed parameters with comments explaining their use. You can copy that file and edit it for your virtual host

Register today for the event and for Dr L’s CLP 11 Pain Point sessions before they fill up at: www.novell.com/attlive!

ATT Live 2012
May 15-18, 2012
Henderson (Las Vegas), NV
4 days of instructor-led, hands-on advanced technical training for only $1,750

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Disclaimer: As with everything else at SUSE Conversations, this content is definitely not supported by SUSE (so don't even think of calling Support if you try something and it blows up).  It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.

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