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 id 

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