EX-200 - Red Hat Certified System Administrator
Setup
home vms 192.168.50.164 192.168.50.105 work vms 192.168.17.185 192.168.17.208 Hyper V Disable sec...
File Management
Linux Filesystems: ext3 ext4 xfs Windows Filesystems: NTFS FAT Basic Commands pwd print working d...
File Editor
Text Editors ed (1969) original, line oriented standard for Unix ex (1976) extended, more powerf...
Shell Scripting
Basic Commands echo $0 display current shell cat /etc/shells display available shells cat /etc/pa...
Scheduled Tasks
Scheduled Tasks crontab -e scheduled jobs -e edit at. scheduled one-off jobs * * * * * minute (0...
Access Control
File Permissions Files that are not scripts do not have x Directories have x because users can cd...
SELinux
User Management
useradd username create a user groupadd groupname create a group userdel username delete user gro...
Processes & Services
Basic Definitions Application Script Process Daemon Thread Job Monitoring and Management command ...
System Performance
Tuned - dynamic system duning daemon rpm -qa | grep tuned check if tuned package is installed yum...
Networking
Basic Commands ip a Display network inerfaces and details ip addr ifconfig hostnamectl set-hostna...
Network Firewall
Software Firewall (Runs on operating system) Hardware Firewall (Dedicated network appliance) Mode...
Archive & FTP
Archive and Compress Files tar cvf nsotelo.tar /home/nsotelo archive all folders in /home/nsotelo...
Software & Packages
RHC Connect (needed for package commands) rhc connect -u username -p password connects to red hat...
Containers
Containers allows developers to test and build applications on any computer by putting it in a co...
Storage & LVM
Types of Storage Local Storage SAN (Storage Area Network) NAS (Network Attached Storage) Basic ...
Stratis Pools
Stratis Red Hat 8 introduced Stratis volume management Uses thin provisioning (starts with 546Mb)...
Network File Shares
Network file sharing (Linux to Linux) A client's mounted NFS export appears as a local directory ...
Boot Modes & Recovery
New Boot Process (CentOS/RHEL 7 and above): systemd manages boot sequence backward compatible wit...