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Linux Administration on zSeries and S/390 Systems?

Posted on 2005-04-24
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Last Modified: 2013-12-16
Hello, I am new here.

My question is, suppose I have SUSE Linux Enterprise Server 9 on an IBM zSeries or S/390 system and I would like to know how to boot or run without the X or GUI mode?

How do most Linux server Administrators run their Mainframes and how can it be changed from an X or GUI enviroment to whatever enviroment they MOSTLY configure the Mainframes? Do they use GUI or X or what enviroment do they use to administor the Mainframes? I am assuming that running X or GUI takes up alot of memory...

Thanks-
jslayton01
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Question by:jslayton01
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Expert Comment

by:wesly_chen
ID: 13856429
>  how to boot or run without the X or GUI mode?
As root, edit /etc/inittab
id:5:defaults:   ===> id:3:defaults:

Runlevel 3 is the text mode.

For Linux/Unix server, running X or GUI is not required and it will bring in some security concern since
X11 has the buffer overflow issue from time to time.
If you are familiar with command line administration, then you definitely no need to run X on server.
It consumes more resource and raise more security holes.
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LVL 38

Expert Comment

by:wesly_chen
ID: 13856431
By the way, /etc/inittab is for boot up default runlevel.
If you want to change from current runlevel 5 (GUI) to runlevel 3 (text), then as root, type
init 3
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Author Comment

by:jslayton01
ID: 13858609
Ok, great. I got it.

But one more question here if I can. How do MOST Linux Administrators run their Mainframes? Do they run it in Runlevel:3? In other words, which type of mode is usually the most secure and mostly used on Mainframes running on Linux?

Thanks
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LVL 38

Expert Comment

by:wesly_chen
ID: 13860324
Most secure mode? Single user mode is the most secure mode. :-)
Anyway, for most of Linux distros, runlevel 3 is mostly used on Mainframes.
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Author Comment

by:jslayton01
ID: 13862700
Thanks... to everyone.
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Author Comment

by:jslayton01
ID: 13891319
One last question. What messages or codes that are displayed on each console emulation application (usually running Windows) that are transmitted from the Linux Mainframes? I one time took a tour of this datacenter and they had this console emulator (TN5250 or TN3270) and it had the Date/Time listed and plus the messages or codes along with it constantly logging those messages on the consoles.

Is there like a screenshot to show me? What do they relaly mean? Please provide me with a link on where I can read upon this informationi please.

 
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Expert Comment

by:wesly_chen
ID: 13896813
In /etc/syslog.conf, there is
kern.*       /dev/console    (this line  may be commented out)

Console emulator just take your console (or the monitor hook on the Linux box) output and pipe it to
the console emulator's monitor through serial port.
The messages you saw are configured by /etc/sysconfig.conf.

Please do
man  syslog.conf
for more information.
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Author Comment

by:jslayton01
ID: 13897901
Uhm, they looked liked this below:

21:05 IW05578
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Expert Comment

by:wesly_chen
ID: 13897985
> 21:05 IW05578
This message is showed by the console emulator. (date and hostname or port name)
But the rest of console messages is configure in /etc/syslog.conf
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Author Comment

by:jslayton01
ID: 13899281
Ok now I got it. Because when I saw the console, it continuesly kept logging codes or messages from the Linux z/VM Mainframe.

Is their any website that I can go on and read further on this?
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Accepted Solution

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wesly_chen earned 500 total points
ID: 13899367
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Author Comment

by:jslayton01
ID: 13899403
I have the TN3270 emulator. I was trying to ask for like a screenshot of those messages on a emulator somewhere on a website. If someone can, then please let me know. Thanks.

0
 

Author Comment

by:jslayton01
ID: 13899462
I found one here:
http://www.bsp-gmbh.com/turnkey/cookbook/opmvs.html

I saw something like this on a datacenter but the codes were gathered from a z/VM Linux system.
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