how can i change my career from front-end to linux admin.

and what are the best resources to become a linuxadmin.

Perhaps you should explain what exactly you mean by a "front end"?

Are you aware of what a System Administrator does?
(How you do it depends on the OS, but WHAT you to is fairly well defined, just insanely broad.)

With no other knowledge of your current training, experience, or performance we would be guessing. A LOT!

find a small SME, offer to migrate their existing system to open source and pay you the license fees of the old system. They gain a 24/7 onsite IT go-for everything Admin...

Absolutely HugeHugeHuge amount of work but can be very rewarding...

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You could get your Linux Certification as an Administrator.
https://www.redhat.com/en/services/certification/rhcsa

I strongly suggest that you run RHEL or Centos for a while before you take the exam and read the Guide that prepares you for the exam.
http://www.amazon.com/RHCSA-Linux-Ce.../dp/0071765654

Install Linux today and learn commandline so you'll have the experience to run a RH system.
Centos is the free version of RH so you could start there.
https://www.centos.org/download/
http://linuxcommand.org/

Once your employed in your new career in an enterprise that's running RH or any other Linux distribution that's suited for the workplace you'll be good to go.
http://ptgmedia.pearsoncmg.com/image...951_sample.pdf

Good Luck-

Why Red Hat?

Fred.

Most large Corporations and Enterprises that run Linux run Red Hat for it's support, subscription and contract.
If something goes south Red Hat will assist a company until the os is up and running again amongst other things. Smaller business's might use Ubuntu Server or even Linux Mint.

Like I said there are other distributions that company's could use.
Open Suse is another excellent distribution for the workplace but so is Scientific Linux.

You get a FREE Red Hat Jacket with your learning subscription? 8>)

Talk to your present employer about your career interests.

Your present job description can be changed, enhanced, shifted into new areas that might be of interest to you and of benefit to your employer.

Enlightened employers will often pay for professional-development training, certifications and so forth. Of course, they may ask you to agree in writing that you will then either continue to work for them for so-many years, or repay their investment in you.

"Bloom where you are planted." "Leverage what you already know." "Effect change in front of people who already know you." And, don't feel bad for looking across the fence at other pastures. It happens to everyone, more than once. Just remember that there might well be a gate in that fence, and that your present employer might well be pleased to open it for you!