What should a linux administrator know?

Question

linux

What knowledge do I need to have to get a job?
What should I be able to do?
What should I know besides Linux itself?

Answer 1

"Know Linux" is already a rather loose concept. Either you know how it is launched and the main work with files from the command line (ls, rm, cp, that's all), or you can configure functionality on it from a dozen or two packages related to non-trivial configs (RADIUS / sssd / xl2tpd, let's say this what I had to set up) - both options are "know Linux" in their own way, and usually, after the appearance of tasks from the second list, it becomes clear that you just don't know Linux, but you will find out as you solve them.
As for working as a system administrator, most often, in addition to Linux, you need to know networks (at least a TCP / IP stack with DHCP / DNS / ICMP protocols), Windows AD (few people work purely on Linux), work with an office suite, general information about server hardware , the principles of operation of backup systems, what you can stick in, etc., with such baggage you can look for a position as a junior admin in an office with a couple of IT people in the office, and try to gain experience from older comrades before they run away, leaving the entire infrastructure to you . Then you will need to pull up applied knowledge on the software used, the more it is, the more interesting it will be and the higher the level you can take later. Most often these are hypervisors with their own troubles, equipment replacement, simple configurations of iron switches / routers, applied problems with printing, VDI / RDSH / Xen / what-there-where from shared environments, perhaps, working with storage systems via FC or iSCSI, local special-legacy software, backups of all options, HA / DR concepts, clusters of different types with their own protocols, etc. Enough for a start.
PS: read Habr, especially thematic articles on technology, and still learn to google unknown or non-standard problems - oddly enough, but the search sometimes helps to reduce oddities to an understandable level, and pure solutions come across. But memorize by heart what to do if Google is not available, especially if you are in the server room and your mobile does not catch, but you can’t get out.

Answer 2

OSI
How networks work Hardware of the
main vendors
How crimping works
How to refill cartridges
What is sql
Telephony
Preferably a low voltage license
Preferably a power grid permit up to 600 volts
Basic knowledge of the software package used in the office.
Ability to work with a puncher, screwdriver and drill
A fair amount of indifference and the ability to sit up to 12 if it burns.
Ps knitted sweater with deer, jeans and a beard will be a plus

Answer 3

Well, that's all...
https://www.youtube.com/watch?v=dQjUH0kTq8w&list=P...

Answer 4

You need to know how server operating systems work on Linux and be able to set up a server from scratch. Everything that works in your office you should know so that you can easily raise any service on a new server if the old one "died"
It would not be bad to know virtualization, the most popular is KVM, Hyper-V, VM Ware
user OS you need to know 7-ku and 10-ku
If the accounting is not small, then still 1C, although so to get it on the server
Cisco and Mikrotik are two separate worlds that are now often asked.

Answer 5

For starters, you should be able to "google" because this question consistently pops up once a week on this resource. Use search.