User:Tom/RHCSA EX200

Lab setup

Physical host         host1
Virtual machine 1     server1
Virtual machine 2     server2

Hoofdstuk 02 Using basic Linux Tools

ssh host
ssh -l user host
ssh -X host
ls pwd cd mkdir 
tty who uptime whoami logname
if groups 
last lastb lastlog 
uname 
hostnamectl
timedatectl list-time-zones
clear 
which wc
lspci lscpu
gzip gunzip bzip2 bunzip2 tar star
vi
man apropos mandb whatis info

Hoofdstuk 03 Working with files and file permissions

/boot /var/ /usr /opt /home /dev /proc /sys /tmp
file touch cat less head tail
cp mv rm lsattr chattr
find 
ln, ln -s
chmod chown chgrp
umask files en directories
Special permissions setuid setgid sticky

Hoofdstuk 04 Dealing with the Bash shell, processes and scheduling

variables, local and environment
export unset
> >> &>
HISTFILE history
set -o vi
grep * ? \
ps pidof pgrep
nice  renice
kill pkill killall
at crontab 

Hoofdstuk 05 Managing software packages

RHSM Red Hat Subscription Management
SAM Subscription Asset Manager
subscription-manager
rpm rpm2cpio
mount /dev/cdrom /mnt
mount -o loop /.../*.iso /mnt

yum /etc/yum.conf

Hoofdstuk 10 Constructing and using filesystems and swap

Filesystem administration commands. e2fsck fsck.ext3 fsck.ext4 mke2fs mkfs.xfs resize2fs tune2fs

Commands common to all filesystems. blkid - Used to dermine UUID of a partition / logical volume / filesystem mount umount

UUID universally Unique IDentifier

Swap Space

free -h

Hoofdstuk 11 Controlling Access thtough Firewall and SELinux

SELinux

context for subjects and objects
context contains a type or domain and a security level with subject and object information
-u user, _r role, _t domain

Domain transitioning allows a proces in one domain to enter another domain to execute an application authrized to run in that domain only, a proper rule must exist to support such a transition.

Commands

id -Z                                                      View context set on Linux user
ls -Z                                                      Determine context for files
ps -eZ                                                     Determine context on processes
seinfo -u                                                  List available SELinux users
semanage
sestatus                                                   SELinux status tool
getsebool -a                                               Show all SELinux Boolean variables
setsebool                                                  Set a boolean variable
getenforce                                                 Get the current mode of SELinux
setenforce
cp --preserve=context                                      Preserve specified attributes
sealert                                                    SELinux troubleshooter

Packages

libselinux-utils
policycoreutils
setools-console                                            contains seinfo command
setroubleshoot-server                                         Troub

Files

/etc/sestatus.conf
/etc/selinux/config                                         Controls state of SELinux (enforcing, permissive or disabled
/etc/selinux/targeted/contexts/files/file_contexts.local    custom context
/sys/fs/selinux/booleans

Hoofdstuk 12 Administering Network Interfaces and Network Clients

Hostname

Commands

arp -a
ip neighbor
hostname
hostnamectl
nmcli
nm-connection-editor
nmtui
uname 
systemctl restart systemd-hostnamed

Files

/etc/hosts /etc/sysconfig/network-scripts