Linux Bible. Christopher Negus

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      But whether you seek to develop the next great open source software project or simply want to gain the skills needed to compete for the thousands of well-paying Linux administrator or development jobs, it will help you to know how to install, secure, and maintain Linux systems.

      So, what are the prospects for Linux careers? “The 2014 Linux Jobs Report” from the Linux Foundation (http://www.linuxfoundation.org/publications/linux-foundation/linux-adoption-trends-end-user-report-2014) surveyed more than 1,100 hiring managers and 4,000 Linux professionals. Here is what the Linux Foundation found:

      The major message to take from this survey is that Linux continues to grow and create demands for Linux expertise. Companies that have begun using Linux have continued to move forward with Linux. Those using Linux continue to expand its use and find that cost savings, security, and the flexibility it offers continue to make Linux a good investment.

      Understanding how companies make money with Linux

      Open source enthusiasts believe that better software can result from an open source software development model than from proprietary development models. So in theory, any company creating software for its own use can save money by adding its software contributions to those of others to gain a much better end product for themselves.

      Companies that want to make money by selling software need to be more creative than they were in the old days. Although you can sell the software you create that includes GPL software, you must pass the source code of that software forward. Of course, others can then recompile that product, basically using and even reselling your product without charge. Here are a few ways that companies are dealing with that issue:

      This is in no way an exhaustive list, because more creative ways are being invented every day to support those who create open source software. Remember that many people have become contributors to and maintainers of open source software because they needed or wanted the software themselves. The contributions they make for free are worth the return they get from others who do the same.

      Becoming Red Hat certified

      Although this book is not focused on becoming certified in Linux, it touches on the activities you need to be able to master to pass popular Linux certification exams. In particular, most of what is covered in the Red Hat Certified Engineer (RHCE) and Red Hat Certified System Administrator (RHCSA) exams for Red Hat Enterprise Linux 7 is described in this book.

      If you are looking for a job as a Linux IT professional, often RHCSA or RHCE certification is listed as a requirement or at least a preference for employers. The RHCSA exam (EX200) provides the basic certification, covering such topics as configuring disks and filesystems, adding users, setting up a simple web and FTP server, and adding swap space. The RHCE exam (EX300) tests for more advanced server configuration, as well an advanced knowledge of security features, such as SELinux and firewalls.

      Those of us who have taught RHCE/RHCSA courses and given exams (as I did for three years) are not allowed to tell you exactly what is on the exam. However, Red Hat gives an overview of how the exams work, as well as a list of topics you can expect to see covered in the exam. You can find those exam objectives on the following sites:

      As the exam objectives state, the RHCSA and RHCE exams are performance-based, which means that you are given tasks to do and you must perform those tasks on an actual Red Hat Enterprise Linux system, as you would on the job. You are graded on how well you obtained the results of those tasks.

      If you plan to take the exams, check back to the exam objectives pages often, because they change from time to time. Keep in mind also that the RHCSA is a standalone certification; however, you must pass the RHCSA and the СКАЧАТЬ