# RHEL - RHCSA Exam Objectives
RHCSA exam candidates should be able to accomplish the tasks below without assistance. These have been grouped into several categories.
Understand and use essential tools
- Access a shell prompt and issue commands with correct syntax - Use input-output redirection (>, >>, |, 2>, etc.) - Use grep and regular expressions to …
read more## RHEL TASKS
Task 01: Assuming the root user password is lost, and your system is running in multi-user target with no current root session open. Reboot the system into an appropriate target level, and reset the root user password to root1234. (Exercise 11-2). After completing this task, log in as …
read moreCircuit Switched Calls
Question:
Explain circuit switched Calls
Answer:
A circuit-switched call is a type of telephone call that is established by setting up a dedicated connection, or circuit, between the two parties for the duration of the call. In a circuit-switched call, the connection is maintained until the …
read moreThis article is adapted from SpinupWP - How to Set Up MySQL Incremental Backups.
By end of this article, you should be able to set up Incremental backup for your MySQL instance and restore the database. Please read aforementioned article on snapshot backup and incremental backup.
This article …
read moreThis article will serve as notes on container management. This article will not delve into containers in RHEL-like systems as it is up to the reader to research about it. This article will see how to check container tools, inspect images, download and run. Also removing a container and images …
read moreThis article explores the opportunity of a Master-Slave replication on MySQL 8. The underlying OS is FreeBSD 13.
On the Master server install and start the MySQL service. Log into MySQL as root and perform following steps:
create user 'replicate'@'%' identified with mysql_native_password by 'tryhackme';
grant replication slave, replication client …
This article was written using FreeBSD 11.3-RELEASE. Assumption is made such that reader knows what is SNMP (Simple Network Management Protocol). At the end of the article, you should have working setup of SNMP & MRTG (Multi Router Traffic Graph) .
There are two packages available for SNMP …
read morepkg to latestroot@freebsd-sftp:~ # mkdir -p /usr/local/etc/pkg/repos
root@freebsd-sftp:~ # vi /usr/local/etc/pkg/repos/FreeBSD.conf
```
FreeBSD: {
url: "pkg+http://pkg.FreeBSD.org/${ABI}/latest"
}
```
freebsd-update fetch installpkg updatepkg update -f && pkg upgrade -fDocker container is a running instance of Docker image.
$docker images For example, it shows available images in the local repo
docker search <SEARCH_STRING> For example docker search ubuntu
docker pull <IMAGE> For example docker pull ubuntu:latest
docker run -i -t ubuntu To run the image …
This script is meant to be used once you have delegated your nameservers to the ones you control. It will take a while to have it delegated so this small script is to help you check if the resolution is successful. The output of the script …
read moregolang Installation - LinuxThis guide/article was written for Debian 10 GNU/Linux running latest updates. Before you begin, run following command to update your system.
#apt update && apt upgrade -yOnce you have completed above step, now it’s time to install Go Programming Language or …
note: This article was achieved on a FreeBSD 11.4-RELEASE host parked in the cloud. This guide should work for anyone who is willing to put in their commitment to work. Make sure your FreeBSD host is up …
read moreiptables for GNU/Linux client machineNote: This article is written for fully patched Ubuntu 18.04 LTS GNU/Linux machine running latest kernel. The ruleset that comes with this article should work with other GNU/Linux derivatives.
This article assumes reader has some knowledge in Firewalls and it …
read moreThis article is for beginner pentesters who are struggling in getting their own Metasploit installation up and running. Also I realized some struggle when it comes to generating the payload or executing the exploit. This article will touch on the basics of working payload generation …
This article was written using FreeBSD 11.3-RELEASE. Assumption is made such that reader knows what is SNMP (Simple Network Management Protocol). At the end of the article, you should have working setup of SNMP & MRTG (Multi Router Traffic …
read moreThis article is a simple trick to have Tor Browser running as non-root user in Kali Linux. A lot of programs in Kali Linux requires you to run as root user, and Tor Browser does not like it run with root …
read morenote: This guide would roughly give you idea setting up a proper jail with networking enabled.
update: You can install jail packages from the host without having to download and install pkg for your jails.
This article is written for people who would like …
read moreThis note will be updated from time to time as I am currently in the process of self studying for RHEL RHCSA certification. The notes should be clear to understand. If you do not understand, contact me.
/etc/passwdThe password aka passwd file holds information …
This article is written for those who would like to switch from quarterly package management to latest package management in FreeBSD operating system.
In order to do so, first you need to do the following:
vim /usr/local/etc/pkg/repos/FreeBSD.conf
Inside that file, enter following contents:
read moreFreeBSD …
Hi! I’m your first Markdown file in StackEdit. If you want to learn about StackEdit, you can read me. If you want to play with Markdown, you can edit me. Once you have finished with me, you can create new files by opening the file explorer …
read morefollowing configurations should work with nat environment
[code lang=text]
#!/usr/local/bin/env sh #flush out the list before we begin ipfw -q -f flush
To generate assembly code out of your C program, type following command:
$gcc -S
Then to generate object file out of the assembly file, type following command:
$gcc -c
Then to compile it into a program will be following:
$gcc
If you encounter this issue after ftp connections working fine, you need to add following code into wp-config.php
[code lang=text]
if(is_admin()) { add_filter('filesystem_method', create_function('$a', 'return "direct";' )); define( 'FS_CHMOD_DIR', 0751 ); } [/code]
Give appropriate permission to apache24 root folders and its subfolders by executing chown -R www:www …
pf.conf below allows NAT connection to jail if you have any. Below configuration worked for me. To monitor using pflog0, refer to the example below.
PF is a good firewall solution for FreeBSD. It was first appeared in OpenBSD, then ported to FreeBSD and other platforms such as …
read moreLoad VirtualBox:
\==============
You need to load the vboxdrv kernel module via /boot/loader.conf:
vboxdrv_load="YES"
You also have to add all users to your vboxusers group in order to use vbox.
% pw groupmod vboxusers -m
Reboot the machine to load the needed kernel modules.
Bridging Support:
\=================
For bridged networking …
read moreNOTE: This guide serves as tutorial to claim free space in my machine. I will attempt to explain what I am doing. Assumption is made such that there are 5 partitions in /dev/sda at the time of writing. I was trying to claim /dev/sda2 to extend /dev/sda5 …
PF is a complete, full-featured firewall that appeared since FreeBSD 5.3. It has optional support for ALTQ (Alternate Queuing) which provides QoS (Quality of Service). Visit here for more details.
Below configuration should work for typical 2-NIC set up.
#################################
#### Packet Firewall Ruleset ####
#################################
###################
#### Variables ####
###################
# External interface
ext_if="CHANGEME"
# Internal interface …This guide was written based on result from a vps server. After following this guide, you should have working OpenVPN server and client.
First we need to update pkg manager and then install openvpn package.
#sh
#pkg update && pkg install openvpn
Next …
read moreThis guide was written to setup Linux® compatibility for FreeBSD. This guide was done in GhostBSD, should work for FreeBSD and other BSD derivatives.
In order to load Linux kernel module, run the following command:
#kldload linux # you can load linux64 kernel module as well
To check if aforementioned module …
read moreThis guide is written to assist users in creating partition for disk, usb drives etc. Assumption is made that you are comfortable in command-line tasks and roughly understand the process of identifying partition, deletion, create new partition and format the partition.
Start command-prompt as Administrator.
Type diskpart and you will …
This article will guide you on installing Gentoo GNU/Linux for x86 system. This guide was written based on official documentation available here. At the end of this guide, you should have working GNU/Linux operating system. For this installation, I have made several assumptions, which …
This article is written for 11.2-RELEASE. This is the production release. There are other releases such as -STABLE, -CURRENT. Kindly read through official documentation on the differences between these releases and how,where you can use these releases. This article also assumes that you have perquisite as …
read moreYou can try this too, intended for educational purposes only. I am not responsible for any damage caused.
As per some documents online, you can extract contents of .docx file into a folder, add any file(I added 7-zip installer file) into it, and compress the file back to .docx …
read moreInstall PiHole - Raspberry Pi 3 The installation may fail, work. Suppose it does not work, visit discource.pi-hole.net for troubleshooting by the devs. Update & Upgrade (if there is) $apt-get update $apt-get upgrade
change raspi hostname $hostnamectl set-hostname
ip command - set a default router
if you encounter problem while running Unetbootin, that an error will prompt you to run a piece of code. Run the code in su(sudo should work too), because it worked for me. This happens when you install Unetbootin from distribution's package. Compiling would work fine?
dnf install unetbootin
su …
read more[gallery ids="911,912" type="rectangular"]
read moreyou may encounter systemd-resolve if you're using Ubuntu etc
systemd-resolve --status
*to retrieve information on systemd-resolve
refer to following link on troubleshooting (un-tested) ->https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu
read moreit tells you domain
ss -lp 'sport = :domain'
expected output
[code lang=text] Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port udp UNCONN 0 0 127.0.0.53%lo:domain 0.0.0.0:* users:(("systemd-resolve",pid=768,fd=12)) tcp LISTEN 0 128 127.0.0 …
read moreRun
gksu gedit /etc/*release
Change the file like this (depending on your release):
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=Xenial Xerus
DISTRIB_DESCRIPTION="Ubuntu 16.04"
Save and close the file. - Run
gksu gedit /etc/*issue
Change the file like this (depending on your release):
Ubuntu 16.04 \n \l …
First create OpenSSL CA with easy-rsa or OpenSSL for OpenVPN.
This is OpenVPN server configuration file:
tls-server
port 1194
proto tcp
dev tun
ca /etc/ssl/ca.crt
cert /etc/ssl/server.crt
key /etc/ssl/server.key
dh /etc/ssl/dh2048.pem
topology subnet
server 10.0.0 …update:
5:03AM - adding note for fedora
ORIGINAL: WRITTEN FOR UBUNTU/LINUX MINT
suppose you encounter funny network interface names, such as:
enp2s0 etc etc
filename: grub2.cfg/grub.cfg
you can change them by adding following
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"
Update:
5:03AM - 28th August 2018 -
This dd command will help you to backup large file/partition etc etc. Use with care! Stolen off stackoverflow (credits to the guy(s) who answered)
** I am still struggling to merge those split files into one huge file. If you have answer, post it to message boards
tar --extract …
read moreThis tutorial is written for those who are struggling to add new tools such ask android/sdk, android/platform-tools and golang installation. This tutorial should work on windows 7,8,10. This tutorial was written while installing Golang on Windows 10 Machine.
Proceed by starting command-line prompt with "Run As …
read moreTo create virtual image with 20GB space: $ qemu-img create ubuntu.img 20G
To boot created image with iso and 512mb ram $ qemu-system-i386 -drive format=raw,media=cdrom,file=ubuntu.img -cdrom ../Downloads/mini.iso -m 1024
To boot image with 1GB ram: $ qemu-system-i386 -hda ubuntu.img -m 1024
read moreFollowing path should be available in your Environment Variables so that you will be able to use android tools from command-prompt.
Following pictures will describe paths needed.
This will allow you to build applications using frameworks such as Apache Cordova.
read moreYou can create Virtual Hard Disk by accessing diskmgmt.msc and attach as if it is actual hard disk drive. Only difference is it is virtual. It should be easy to move those files around, from one computer to another.
Note: Be sure to try this with appropriate user permissions …
read moreYou can play following commands using URL: https://www.phrack.org/archives/tgz/
To download archives, you can use download manager or following loop:
[code lang=text] for i in {1..69}
do
wget http://phrack.org/archive/tgz/phrack$i.tar.gz
done
[/code]
List contents of tar.gz …
read moreThis tutorial will guide you on how to install FreeBSD in virtual machine.
You will be prompted with Keyboard Selection. Select your desired keyboard layout.
Next you will be presented with Set Hostname. Set your hostname. You can follow mine for example.
Then you will be prompted with Distribution Select …
read moreThis tutorial will explain how to create system image backup for Windows 10 in same hard disk. Before you begin, make sure I am no responsible if you lose your data in the process. Follow carefully and you should be able to reset Windows 10 installation with disk/usb installation …
read moreIf you are prompted with following error:
Determine if you are running EFI or BIOS: launching cmd as administrator type msinfo32 in the prompt
I am using legacy BIOS so the fix will be running following command at prompt: bcdedit /set hypervisorlaunchtype off
For EFI visit following link:https://kb …
read moreCompile & Installing your own kernel in FreeBSD is not that difficult, as long as you follow the process properly. I managed to compile and install my own kernel using DigitalOcean's kernel configuration example. I will most mine as an example as it was done in VMware. Following is the kernel …
read moreForemost is a forensic tool used to recover lost files based on:
Foremost can work with DD image type as well.
Link: http://foremost.sourceforge.net
Example command:
Source:https://tools.kali.org/forensics/foremost …
read moreFreeBSD has its own package management which is the ports tree. Ports tree has all the packages you need to build/run application such as subversion, git and others.
To check when you last updated ports tree, execute following command:
stat -x /usr/ports/UPDATING
Output will show you the …
read moreShould you ever fall into initramfs after restarting from fresh kali linux installation,
try cleaning boot partition,
if it is not install in sda1, check in /dev
and execute file cleaning fsck.ext4 -f /dev/sd{a,b}
and reboot your machine/virtual machine.
You should be able to boot …
read moreSetting up FreeBSD is fun, especially when you are performing clean installation. We are going to cover setting up FreeBSD virtual machine file download from this link.
Take Note: If you are using Virtualbox to boot up FreeBSD, select NAT . I have not tried other network configuration options as of …
Following guide will teach you how to format your USB STICK.
hit fdisk -l / fdisk -s to determine usb drive path.
hit fdisk /dev/sdaX to enter fdisk program with device attached
press d to delete existing partitions.
press n to create new partition
press p for primary partition
Hit …
read moreThis article to be updated from time to time.
1)Unscrupulous
Definition:
Synonym:
2) Embolism (Medical Term)
Definition:
Note: This blog post was written using StackEdit (Online Markdown Editor). You may see some errors.
** if you do not get what you are looking for, kindly look at Microsoft Support Documents, also utilize powershell's built-in feature to spit some common examples which is super …
read moreThis quickstart shows you how to create a command prompt (cmd) with administrator privileges shortcut in your desktop.
To create a shortcut, on your desktop, right click then, select new. It show expand to another view with bunch of options. Select Shortcut.
You will …
read moreThis tutorial was written to guide users in creating RPM package using GNU Hello source.
# dnf install fedora-packager @development-tools# usermod -a -G mock$ rpmdev-setuptree~/rpmbuild …To format your usb drive in linux, first you need to find out where the usb drive is mounted. To find out the device, type dmesg . At the very end of dmesg output, you will see some messages relating to the usb drive you …
Windows:It's recommended to download GitHub for Windows, which includes Git1 and has an easier install : windows.github.comUse the Git Shell for your terminal. Linux2: Debian-like-Distro: - $ sudo apt install git RPM-like-Distro: - $ sudo dnf install git(Fedora23/24) or - sudo …
This tutorial was written to guide users in installing VNC Server in their Fedora workstation.
dnf updatednf install tigervnc-servercp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@.service Edit the file replacing `````` with …Update
Wrote this article when I was using Linux Mint
This tutorial is written on how to remove existing desktop environment and install xfce4.
Xfce4 is a light weight desktop environment with low memory footprint. Using Xfce4 is somewhat like using a mac, just a little bit older …
read moreThis tutorial was written to guide users in installing dartlang in their linux workstation.
Update sudo apt-get update
Install apt-transport-https sudo apt-get install apt-transport-https
Get Google Linux package signing key sudo sh -c 'curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -'
Set up the …
Most linux distributions come with OpenJDK installed. This tutorial was written to teach how to install Oracle JDK on Linux.
1)Remove OpenJDK Installation apt-get update && apt-get autoremove --purge openjdk*
2)Download latest Oracle JDK. Look for linux version ending with tar.gz …
read moreThis tutorial was written for those who wish to get involved in Linux environment. This tutorial will be updated from time to time.
Show where you are Solution
bash-2.03$ pwdtmpbash-2.03$ export PS1='[\u@\h \w]$ '[jp@solaris8 /tmp]$
Need to find and run a …
For: Mid-range Linux Users
Written sh script for Debian-Linux to install Go language.
To install the script, copy the code, save as anything you wish, give executable permission and feed it with latest Go insllation archive.
script link: https://github.com/vgnshlvnz/installation-scripts/blob/master …
read moreThis tutorial should work on any windows from 7 and beyond.
To start:
Open command prompt from Start Menu, right-click and run as Administrator
Once you're in command-prompt, type wmic /output:C:InstallList.txt product get name,version
Then go the directory and you should …
This quickstart shows you how to create a small App Engine application that displays a short message.
Before running this sample, take the following steps:
1) Select or create a Cloud Platform Console project. Go To The Projects Page
2) Enable billing for your project. Enable Billing …
Question 1:
Write a program that prints the text "HELLO WORLD" to the console (stdout).
Hint:
To make a Node.js program, create a new file with a .js extension and start writing JavaScript! Execute your program by running it with the node command. e.g.:
$ node program.js
You …
read moreThis tutorial was written to ease problems faced by graduates losing their work. By enabling autosave feature in Word 2013, you will save your work incase your computer crash.
File -> Save -> BrowseTools near …This tutorial is written for those who are struggling to add new tools such ask android/sdk, android/platform-tools and golang installation. This tutorial should work on windows 7,8,10. This tutorial was written while installing Golang on Windows 10 Machine.
Proceed by starting command-line prompt with "Run As …
read moreQuickstart with MongoDB
Once you have obtained your account with Google Cloud Console, proceed to do the following:
Install Google Cloud SDK from [here].
Make sure following are selected:
Initialize the SDK
Use the gcloud init command to perform several common SDK setup tasks. These include authorizing the SDK tools to access Google Cloud Platform using your user account credentials …
This page describes how to create a Google Cloud SQL instance (either First Generation or Second Generation). A Google Cloud SQL instance is a MySQL database hosted in Google's cloud.
For information about installing and getting started with the Cloud SDK, see Google Cloud SDK. For information about the Cloud …
read moreThis quickstart shows you how to create a small App Engine application that displays a short message.
We've created a simple Hello World app for Python so you can quickly get a feel for deploying an app to Google Cloud Platform. Follow these steps to …
read moreTL;DR:Following are characteristics of an object-oriented programming:
This post written for casual python users who have knowledge in [man]-handling python interpreter. Depending on your workstation operating system, enter python interpreter.
Once you're in the interpreter, assign a variable to the content you want to convert.
e.g:
python>>>string = "
Then print the variable with lower function …
read more"Any man who reads too much and uses his own brain too little falls into lazy habits of thinking - Albert Einstein"
I am writing this guide to help those who are interested in trying Linux as a first time user. Assumption is made such that you're new to Linux and …
read moreWHAT IS LAMP?
LAMP is an acronym for Linux, Apache, MySQL (or MariaDB) and PHP/Perl/Python. It is a software bundle composed entirely of free and open source software used for building dynamic websites and acts as local web server on your PC. On Windows system, WAMP is used …
read moreSQUID
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and …
read moreThis how-to going to teach you how to install Oracle Java JDK and NetBeans in single installer file in linux. This how-to is aimed for those who have average understanding on linux terminal such as setting file permission, downloading and etc.
Steps:
1)Download the file from this web site …
read moreI discovered this application that uses Markdown Syntax which is pretty helpful while writing a blog post or github post. You name it.
What is StackEdit? Check out the following and get yourself familiarized with StackEdit. I am sure most of you will be …
read moreWhat is Unix?
UNIX is an operating system which was first developed in the 1960s, and has been under constant development ever since. By operating system, we mean the suite of programs which make the computer work. It is a stable, multi-user, multi-tasking system …
read moreTo be honest, Raspberry pie is edible.
So which is the non-edible pie then? It's not pie but pi. Behold, Raspberry Pi, a credit-card sized computer aimed at hobbyist and hackers (not forgetting students) around the world. It's an ARM GNU/Linux box only at $25 (price may vary after …
read moreIf you're University student/college student, take note. This is important and eventually it saves you from HEART ATTACK.
Crashes happen. Anywhere, anytime. Even your laptop or desktop may face crashes. While you're indulged with your work, computer goes off and all your work goes off with it. So, make …
read moreWelcome to WordPress.com! This is your very first post. Click the Edit link to modify or delete it, or start a new post. If you like, use this post to tell readers why you started this blog and what you plan to do with it.
Happy blogging!
read more