Todo-and-current 🌱

Readme with todo-and-current, Ai as helper, Gemini.

Today's brain teaser

https://www.helpfulgames.com/subjects/brain-training/memory.html

https://sudoku.com/challenges/daily-sudoku

Shuhari model and 2,3,5,7 revision method

Shuhari model: for bash in this case

We can hide anything, even code!

Stage	Kanji/meaning	Phrase
Shu	Obey	Follow examples exactly and repeat x 3
Ha	Break	Adapt scripts and explore alternatives.
Ri	Separate	Create your own unique, efficient solutions

Applying Shu-Ha-Ri for Accelerated Learning 🐉

Strictly follow one proven method (e.g., one tutorial, one recipe, one set of rules) without deviation or questioning. Focus on imitation and repetition to build unconscious competence (muscle memory/system familiarity).
Actively experiment by testing the boundaries of the rules and integrating knowledge from other sources. Ask "Why?" to understand the underlying principles and trade-offs.
Create your own unique methods and solutions, acting on instinct and deep, internalized knowledge. Teach the skill to others to solidify your mastery.

The 2,3,5,7 revision method

We can hide anything, even code!

Day 2 and day 3 are revision days of the learning achieved on Day 1. Day 4 is a rest day, while Day 5 you re-visit the work. Day 6 is another rest day, and finally Day 7 is your last re-visit opportunity before you write your exam.

Manage workflow (Slipknot is the cure)

Prioritize tasks: Create a to-do list and tackle the most important or difficult tasks first to avoid procrastination and clear your mind.
Focus on one task at a time: Multitasking can decrease efficiency. Concentrate on a single task until it's complete before moving to the next.
Use time-blocking and Break large tasks into smaller chunk

Optimize your environment

Minimize distractions
Declutter your workspace:
Listen to focus-enhancing music

Adjust your mindset and habits

Embrace "done is better than perfect":
Take regular breaks
Automate repetitive tasks

Parked e-lo

https://follow-e-lo.com/

Scripting (and what's fun*)

SQL*, Powershell*, Bash*,
Python, Docker
Think automation, idempotent, .sql .ps1, .sh

Plan! 🔔 🔔

Main plan overview

Bash tutorial, REPEAT and REPEAT over again ⬇️ fill in the shell drop down below, 20 min all it takes.

Docker repeat not install more on linux use docker, you can, but not make gitpages of it ⬇️

Added datadisk, dmzdocker03_datadisk01, 4gb. = ok
Install Docker = ok
Move docker volume to /datadrive (dmzdocker03_datadisk01)
Portainer HTTPS
Docker: Log monitor Q2 2026 Elastic stack
- Kibana and Elastic Search on Docker
- - Filebeat on vm's

dmzdocker03 Mirror server

- Run mirror update, then update client docker03getmirrortest
- Block docker03getmirrortest ubuntu repos
- Add a datadisk big enough to repos
- get ubuntu mirror for version
- on docker03getmirrortest set up apt list
- - apt update, do we get it?
- install zabbix
- install mysql

Then the AZ-2008, jump to the docker section and do azure container registry and instance

This is quick.

https://learn.microsoft.com/en-us/training/courses/az-2008

Then Github actions-> Github self-hosted runners (Azure container registry and instance)

https://github.com/spawnmarvel/learning-docker/blob/main/README-devops.md

Do more AZ

AZ-104 certified professional must know, fill the gaps here (network, monitor, web apps)
20 min all it takes, a tutorial ms doc/learn
Think automation and custom script extensions for Azure pipelines, docker etc

https://github.com/spawnmarvel/azure-automation-bicep-and-labs/tree/main/az-104-certified-professional

Azure SQL tutorial (Azure Free sql) BikeStores & AdventureWorks
- https://github.com/spawnmarvel/t-sql/tree/master/course2_ai

Work stuff

IP21, CIMIO, REPEAT and REPEAT, do all in chm. REPEAT and REPEAT.
Remember sqlplus on localhost
And Computer Science https://github.com/spawnmarvel/quickguides/tree/main/computer-science

Always 🔁

All linux servers, run updates

Network advanced tutorial and checklist

https://follow-e-lo.com/network-and-netsh/

Linux 🏨

UFW, SSH, PS1, Bash quick ref, file system hierarchy, grep, tail, script, env, cron, py

https://github.com/spawnmarvel/linux-and-azure

Linux quick guide grep it

Commands bash quick guide self

We can hide anything, even code!

sudo apt update -y
sudo apt list –upgradable
sudo apt upgrade -y
sudo apt list --installed | grep -i 'influx*'
sudo apt search 'influxdb'

sudo apt update -y
sudo apt install snmp
which snmp
sudo apt remove install snmp
history

dpkg # is the underlying package manager for these ubuntu.
tail -f zabbix_server.logs

sudo grep '*failed*' /var/log/zabbix/zabbix_server.log
sudo tail -f /var/log/zabbix/zabbix_server.log >> tmp_logs
sudo find /var/log -name "*log"

ss -ltn
ss -ant 'sport = :10050'
htop
top
df -lh
ls -lhS

nano demo.sh # https://kodekloud.com/blog/make-bash-script-file-executable-linux/

#!/bin/bash
echo "Hello World!"

# r = read, w = write, x = execute, - = is not granted
ls -l demo.sh

# u = user (owner), + = add, x = execute
chmod u+x demo.sh
# or octal, 744. user (u) has read (4), write (2), and execute (1) permissions (adding up to 7)
# and the group (g) and others (o) have only read permissions (4).
chmod 744 demo.sh

# run
./demo.sh 

# List all users
cat /etc/passwd

ssh-keygen -t rsa -b 4096
#Private: Your identification has been saved in C:\Users\username/.ssh/id_rsa
#Copy this:Your public key has been saved in C:\Users\username/.ssh/id_rsa.pub

ssh-rsa#################################################

# ssh to ubuntu
mkdir -p ~/.ssh
chmod 700 ~/.ssh

touch ~/.ssh/authorized_keys
sudo nano ~/.ssh/authorized_keys
# paste the full ssh-rsa

exit
ssh imsdal@192.168.3.7
no pass

https://github.com/spawnmarvel/linux-and-azure?tab=readme-ov-file#grep-it

Bash tutorial, repeat, repeat and repeat 🚀 🔁 🚀

Update and upgrade / apt install

We can hide anything, even code!

sudo apt update -y         # - Update apt/sources
sudo apt list --upgradable # - List possible upgrades
sudo apt upgrade -y        # - Do upgrade

cd /etc/apt/               # - View apt sources list*
ls -lh
ubuntu.sources 

# lets install zabix agent2
# https://www.zabbix.com/download?zabbix=7.0&os_distribution=ubuntu&os_version=24.04&components=agent_2&db=&ws=

wget https://repo.zabbix.com/zabbix/7.0/ubuntu/pool/main/z/zabbix-release/zabbix-release_latest_7.0+ubuntu24.04_all.deb # Get pack

sudo dpkg -i zabbix-release_latest_7.0+ubuntu24.04_all.deb # -i install

sudo apt update -y

cd /etc/apt/sources.list.d
ls -lh
ubuntu.sources  zabbix-tools.list  zabbix.list

sudo apt install zabbix-agent2      # Install agent

Basic Commands

We can hide anything, even code!

#!/bin/bash
echo "Hello, Bash!"
#
hello.sh

ls    #  - List directory contents
cd    #  - Change the current directory
pwd   #  - Print the current working directory
echo  #  - Display a line of text
cat   #  - Concatenate and display files
cp    #  - Copy files and directories
mv    #  - Move or rename files
rm    #  - Delete files or folders
touch #  - Create an empty file or update its time
mkdir #  - Create a new folder

Text Processing

We can hide anything, even code!

man grep
#  grep, egrep, fgrep, rgrep - print lines that match patterns

grep   # 'pattern' filename
grep -i 'search_term' file.txt                # Search ignoring case differences (uppercase or lowercase)
grep -r 'search_term' /home/user/my_directory # Search through all files in a directory and its subdirectories
grep -v 'search_term' file.txt                # Find lines that do not match the pattern

# Dot (.): Matches any single character (except a newline).
# Asterisk (*): Matches zero or more occurrences of the preceding character or regular expression.
# To match any sequence of characters (similar to the shell's * wildcard), you combine . and *

grep -i 'error' syslog                         # Match contains error
grep -i 'heartbeat.*error' syslog              # Match contains heartbeat followed by any char, then error

cd /etc/zabbix/                     # Find the log file
cat cat zabbix_agent2.conf

cd /var/log/zabbix

grep 'fail' zabbix_agent2.log       # Find all with fail
grep 'version' zabbix_agent2.log    # Find the version  

man awk
# gawk - pattern scanning and processing language

# -F - Set what separates the data fields
# -v - Set a variable to be used in the script
# -f - Use a file as the source of the awk program

cat data.txt
1;espen;45
2;silje;44

awk -F";" '{print $1}' data.txt                      # Field Separator
1
2

awk -F";" -v var="Name:" '{print var, $2}' data.txt # Assign Variable
Name: espen
Name: silje

awk -F";" '{sum += $3} END {print sum}' data.txt    # Data Manipulation
89


# sed 's/old/new/' filename
man sed
# sed - stream editor for filtering and transforming text

# -i - Edit files directly without needing to save separately
# -e - Add the script to the commands to be executed
# -n - Don't automatically print lines
# -r - Use extended regular expressions
# -f - Add script from a file
# -l - Specify line length for l command
# -g - The optional g flag stands for global (substitute all occurrences on a line, not just the first one).

cat data.txt
1;espen;45
2;silje;44

sed 's/espen/jim/' data.txt
1;jim;45
2;silje;44

sed -i 's/espen/jim/' data.txt

cat data.txt
1;jim;45
2;silje;44

cat example.json
{
  "firstName": "espen",
  "lastName": "withman",
  "location": "earth",
  "online": true,
  "followers": 987
}

sed -i 's/espen/roger/g' example.json

cat example.json
{
  "firstName": "roger",
  "lastName": "withman",
  "location": "earth",
  "online": true,
  "followers": 987
}

# Redirect Output to a File
sed 's/roger/tim/' example.json > new_example.json

#  cut - remove sections from each line of files
man cut

# -d - Choose what separates the fields
# -f - Select specific fields to display
# --complement - Show all fields except the selected ones

cat data.txt
1;jim;45
2;silje;44

cut -f1 -d';' data.txt
1
2

# The -f option allows you to select specific fields to display.
cut -f1-2 -d';' data.txt
1;jim
2;silje

#  sort - sort lines of text files
man sort

#  tail - output the last part of files
man tail

# -n [number]: Display the last [number] lines of the file.
# -f: Follow the file as it grows, useful for monitoring log files.

tail -f /var/log/syslog

tail -n 2 /var/log/syslog

# head - output the first part of files
man head

# -n [number]: Display the last [number] lines of the file.

# Display First 10 Lines
head /var/log/syslog

head -n 2 /var/log/syslog

System Monitoring

We can hide anything, even code!

#  ps - report a snapshot of the current processes.
man ps

# -e - Show all processes
# -f - Show detailed information
# -u - Show processes for a specific user
# -a - Show all processes with a terminal
# -x - Show processes without a terminal

ps -e

# display all with details like conf and bin
ps -ef

   zabbix       801       1  0 14:53 ?        00:00:00 /usr/sbin/zabbix_agent2 -c /etc/zabbix/zabbix_agent2.conf

# Show Processes for a Specific User
ps -u zabbix

   PID TTY          TIME CMD
   801 ?        00:00:00 zabbix_agent2

ps -u imsdal
   PID TTY          TIME CMD
   1181 ?        00:00:00 systemd
   1182 ?        00:00:00 (sd-pam)
   1310 ?        00:00:00 sshd
   1313 pts/0    00:00:00 bash
   1366 pts/0    00:00:00 ps

# top - display Linux processes
man top

# -d - Set the time between updates
# -p - Monitor specific PIDs
# -u - Show tasks for a specific user
# -n - Set the number of iterations
# -b - Batch mode operation

# Set Update Interval, each 5 sec
top -d 5

# monitor specific PIDs.
top -p 1010

# Show Tasks for a Specific User
top -u zabbix

# df - report file system space usage
man df

# To display disk space usage, use df:
df

# -h - Show sizes in human-readable format (e.g., KB, MB)
# -a - Show all file systems, even empty ones
# -T - Show the type of file system
# -i - Show inode usage
# -P - Use POSIX output format

# how sizes in human-readable format (e.g., KB, MB)
df -h

# how sizes in human-readable format (e.g., KB, MB) with file path
dh -hT

# du du - estimate file space usage
man du

# The -h option allows you to show sizes in human-readable format
du -h

# free - Display amount of free and used memory in the system
man free

# -h - Show memory in human-readable format (e.g., KB, MB, GB)
#  -b - Show memory in bytes
# -k - Show memory in kilobytes (KB)
# -m - Show memory in megabytes (MB)
# -g - Show memory in gigabytes (GB)
# -s [interval] - Continuously display memory usage at specified intervals
# -t - Display total memory

# -h - Show memory in human-readable format (e.g., KB, MB, GB)
free -h

# [interval] - Continuously display memory usage at specified intervals
free -h -s 5

# kill - send a signal to a process
man kill

# -9: Forcefully terminate a process.
# -l: List all signal names.
# -s [signal]: Specify a signal to send.
# -p: Print the process ID.

# Forcefully Kill a Process
kill -9 1234

# List All Signal Names
kill -l

#  uptime - Tell how long the system has been running.
man uptime

Networking / UFW

We can hide anything, even code!

ping

UFW, or Uncomplicated Firewal

https://github.com/spawnmarvel/linux-and-azure/tree/main/ufw-firewall

File Compression

We can hide anything, even code!

File Permissions

We can hide anything, even code!

Scripting

We can hide anything, even code!

Exercises and Quiz

We can hide anything, even code!

https://www.w3schools.com/bash/bash_commands.php

Apache Tomcat (Solr) (Deleted server, is archive)

Windows.

Install java, apache tomcat, learn logs, install solr, upgrade apache.

Overview of plan

We can hide anything, even code!

Install Apache Tomcat on dmzwindows07
Fix log levels and log size of apache
(fix this 1 out of 3)
Install solr
- Apache Tomcat and Solr windows fix logging 1 out of 3, optimization after scan
Upgrade Apache Tomcat