LinuxCBT – Ubuntu 22x Administration
English | Tutorial | Size: 3.2 GB
LinuxCBT – Ubuntu 22x Administration
Upgrades | Installations
Identify current configuration
Discuss new features
Snapshot current configuration
Upgrade instance online
Confirm upgraded environment
Perform Installations
SUDO Retrofit
Automatic Updates
SHELL Commands | Essentials
tty, pts, ll, la, l, ls, find
alias, cat, file, chmod, chown, history, dd, blkid
IO, Pipes, Redirection, Command Chaining
ps, top, /proc, /sys
head, tail, sudo, su
w, who, whoami, which, whereis
Static IPs Set
Duplicate VM – Retrofit
Common Network Clients
Identify important client utilities
Networking: ping, netstat, mtr, telnet
File Retrieval: wget, curl
Name Resolvers: host, dig, /etc/hosts
OpenSSH | Parallel SSH
Identify Defaults
Discuss TTYs
Generate SSH PKI Usage Keys
Ensure Password-less AUTH
Non-interactively transport content with SCP
Interactively move content with SFTP
Install Parallel SSH clients
Carry out parallel executions
File Permissions | User Management
Explain standard Linux (DAC) permissions
Alter permissions as needed
Test access to content
SET[GU]ID Exploration
Discuss Stickyness
Discuss Symbolic Links
Implement Soft | Hard Links
Examine behavior
User | Group Management
Identify GUI | $SHELL User Management tools
Explore: /etc/{passwd,shadow,group}
Provision users | groups as needed
Test functionality
Modify accounts | groups as desired
Confirm configuration
Storage Management
Explore current storage configuration
Provision additional storage as needed
Online Resize as desirable
Mount | Test | Committ to: /etc/fstab
Sync live content area
Identify current SWAP environment
Allocate SWAP as needed
Enable | Committ to: /etc/fstab
Logical Volume Management (LVM)
Identify default configuration
Provision LVM-dedicated storage
Configure: PVs | VGs | LVs
Extend storage as needed
Reduce VG as needed
Evaluate results
Apt | Snap Packages
Explore package footprint
Peruse configuration
Manage packages via ‘apt’
Discuss Snap Uni Packages
Manage packages with ‘snap’
Confirm configuration
Cron Scheduler
Explore default configuration
Discuss scheduling parameters
Write simple $HELL script
Schedule execution via Cron
Alter schedule as desired
Confirm expected behavior
SYSLOG | LOG Rotation
Explore default configuration
Discuss Syslog Rules
Except facilities from catchall: /var/log/syslog
Explore key logs
Explore LOG Rotation
NginX
Install
Verify
Explore Configuration
PHP Support
PPA Upgrade
SystemD Environment
Discuss Features
Expose managed resources
Manage Services
Journal Control
Hostname Control
SSH Tunneling
Pseudo-VPN Services
Contrast with VPNs
Create | Use Forward tunnels
Establish Reverse Tunnels
TCPDump Packets
Explore ‘tcpdump’ basics
Capture wide variety of packets
Use BPFs to reduce captured data
Replay captures with ‘tcpdump’
Parse with BPFs as desired
GNU Privacy Guard (GPG)
Provision Usage Keys
Share Keys
(De|En)crypt Content
Sign and Verify Content
Network Reconnaissance
Install NMap
Explore footprint
Perform local reconnaissance
Quickly identify available subnet-based nodes
Comprehensive scan of select targets
Explore scripts interface and discuss
Evaluate results
SSH Guard
Install SSHGuard
Discuss Features
Generate SSH Traffic
Evaluate results
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