Runlevels
---------
0 -- shutdown/halt
the system
1 -- single-user
mode; usually aliased as s or S
2 -- multiuser mode
w/ networking
3 -- multiuser mode
w/o networking
4 -- unused
5 -- multiuser mode
w/ networking and X Window System
6 -- reboot the
system
Kernel Headers
--------------
- development libraries
- not installed by default
- needed to compile other kernel version
- package name: kernel-headers
Modules
-------
|
Checks if a module
is builtin in the kernel
|
grep
|
Crash Dumps
-----------
kexec uses a second
kernel to capture the 1st kernels' memory during crashes.
/var/crash - default
location of dump files (vmcore)
Tutorials
---------
|
Booting a RHEL VM
from rescue mode
|
1. power off VM
2. edit settings
and find to boot it to BIOS on next startup
3. power on VM
4. when you see
this prompt --> "boot: ", type "linux rescue"
5. once the rescue
environment finishes booting, choose a language to use
6. choose a
keyboard layout to use
7. wait for network
interfaces to be located, and activate them, so that
requested data can be transferred to
another host (sometimes this doesn't
work, or try to restart NIC on Vsphere)
8. the rescue
environment will try to find the current Red Hat Enterprise Linux
installation on the system., select
"continue"
|
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