how to use CentOS 7

[rauli]

I am to first time, if is wrong topic Admin please move to other correct section.

Only one question, I will start learn Linux, so I installed CentOS on my computer/ on my HDD/, everything ok, and first the wall...
yum update -y or yum install epel-release -y not works,

what I do wrong,

I mentioned it is my first step, so I , I am green, but command should be work, but not work. I am connected to LAN.

Thanks in advance for Your time for help me.

[avij]

Personally, I think "yum <whatever> -y" is a bad habit for interactive use. Drop the -y, and make sure yum is doing what you expect before pressing "y".

If yum does not work, it most probably gives you some sort of an error message. What it is?

[rauli]

Please check image, that info I have.

[TrevorH]

You need to fix your DNS or network. The error is "Could not resolve host: mirrorlist.centos.org: " though I had to rely on google translate to turn "nieznany blad" into "Unknown error".

Check the contents of /etc/resolv.conf to make sure it contains "nameserver 1.2.3.4" lines (where 1.2.3.4 is the ip address of your or your ISP's DNS server. Make sure you can reach that ip address using ping. Check that your routing is correct and that you can e.g ping 8.8.8.8 and fix that if not.

[rauli]

As I mentioned I don't have basic knowledge. Ok, if I used two PC / one with WIN, one with CentOS/ connected to the same router, so connections should be correct.

Please advise , how I can start learn. Step by step.

[slave]

I started with less than basic knowledge - there are many excellent resources available from forums to books - its up to you how far down the rabbit hole you want to go, I decided to go all in