#rhcsa #linux_tutorial #trending A Red Hat Certified System Administrator (RHCSA) is able to perform the following tasks :simple_smile: Understand and use essential tools for handling files, directories, command-line environments, and documentation Operate running systems, including booting into different run levels, identifying processes, starting and stopping virtual machines, and controlling services Configure local storage using partitions and logical volumes Create and configure file systems and file system attributes, such as permissions, encryption, access control lists, and network file systems Deploy, configure, and maintain systems, including software installation, update, and core services Manage users and groups, including use of a centralized directory for authentication Manage security, including basic firewall and SELinux configuration Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark Mailing List: http://bit.ly/feedburnerark Facebook: https://fb.com/linuxarkit LinkedIn: http://bit.ly/linkedark Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark

Monitoring Disk Space utilization and Send Email Alert. Using this shell script we can monitor all mount point usage based on specified threshold value it will send an email alert to email address specified in script. Facebook Page: https://www.facebook.com/Linuxarkit/ LinkedIn Profile: https://www.linkedin.com/in/ravi-kumar-94530121 Google Plus: https://plus.google.com/u/0/+RedhatEnterpriseLinuxStepbyStepGuide Twitter: https://twitter.com/aravikumar48 RSS Feed: https://feedburner.google.com/fb/a/mailverify?uri=arkit GetPocket: https://getpocket.com/@em6gvd95p09cFA4di1T23c2T28Acp7a92c9J1cV31cc953y26eWfrex2FptHu24f Reddit: https://www.reddit.com/user/aravikumar48/ Tumblr: https://www.tumblr.com/blog/aravikumar48

#rhcsa #linux_tutorial #trending POSIX Access Control List ACL : To manage file security using POSIX (Portable Operating System Interface) access control list ( ACL ). ACLs allows to assign different permissions for different users and groups. ACL allows fine-grained permissions to be allocated to a file. Users or groups as well as users and groups identified by a UID or GUID can be granted permissions. The same permissions we can use below flags apply on files and directories. Alpha Symbols r: Read w: Write x: Execute Numeric symbols 4 – Read 2 – Write 1 – Execute - Permissions restricting access to a file to the file owner, membership of a single group or everyone. - The file owner can set ACLs on individual files or directories. - XFS file systems have built in ACL support. - EXT4 file systems created on RHEL7 have ACL enabled by default. POSIX Access Control List two types: Access ACLs: we can use access ACLs to grant permissions for a particular file or directory. Default ACLs: We can use default ACLs only on a directory but if a file inside that directory does not have an ACL, it inherits the permissions of the default ACLs of the directory. https://arkit.co.in/posix-access-control-list-acl/ Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

Open Multiple Putty sessions without typing credentails again and again

Kernel Upgrade using new version of kernel download it from kernel organization site. http://elrepo.org/linux/elrepo/el7/x86_64/RPMS/ Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

RHCSA Complete Exam Practice Questions and Answers. 22 Questions and Answers. Red Hat Certified System Administrator 1. 1:20 Recovery Root Password RHEL7 2. 8:30 Create a Directory 3. 9:16 Assign a static IP Address to your given virtual machine 4 14:24 Create Standard Partition 2 GB in size & mount 5 17:35 Change Host Name 6 18:34 Change SELinux to Enforcing Mode 7 19:55 YUM Client configuration 8 22:17 User Creation and groups 9 25:59 user permissions 10 29:01 Create Logical Volume with given size 11 35:36 NTP Client Configuration 12 37:04 Make your machine LDAP Client 13 40:06 Auto mount NFS export 14 43:42 crontab 15 45:46 Kernel upgrade 16 47:00 Access Control List and Special user permissions 17 50:49 User Creation 18 51:03 Extend swap partition size 19 53:44 Locate files owned by user 20 55:06 Copy the lines from content 21 56:06 Reduce Logical volume size without data loss 22 58:43 Create data archive #RHCSA #Linux #Tutorial Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Github: https://github.com/techtutorials Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9 WhatsApp Group: http://bit.ly/wappg Telegram Group: http://bit.ly/linux-telegram AWS Free Tier Account: http://bit.ly/aws-free-tier-account

#rhcsa #linux_tutorial #trending Getting Started with Linux Basic Commands - RHCSA Certification. In this video session your going to learn basic linux commands like touch, cp, mkdir, rm and rmdir. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

MRTG - Multi Router Traffic Grapher Installation and Configuration Step by Step Guide in Red hat Enterprise Linux 7. https://arkit.co.in/mrtg-installation-rhel7/ Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

How to Monitor CPU Utilization using Shell Script and Get an Email Alert When CPU Usage is HIGH. Making Real Time CPU Utilization Monitoring Script - Tech Arkit Facebook Page: https://www.facebook.com/Linuxarkit/ LinkedIn Profile: https://www.linkedin.com/in/ravi-kumar-94530121 Google Plus: https://plus.google.com/u/0/+RedhatEnterpriseLinuxStepbyStepGuide Twitter: https://twitter.com/aravikumar48 RSS Feed: https://feedburner.google.com/fb/a/mailverify?uri=arkit Reddit: https://www.reddit.com/user/aravikumar48/ Tumblr: https://www.tumblr.com/blog/aravikumar48

NFS - Network File System Installation and Configuration step by step guide. #NFS #server #RHCE #linux_tutorial Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9

#shell_scripting #unix_scripting #scripting Shell Scripting Tutorial-7 head, tail, sort and more commands How to check logs using these commands.

#shell_scripting #unix_scripting #scripting shell scripting tutorial-1 course overview in this video session we can see how shell script course is going to help, course fee structure and who should learn it. Here is the Shell scripting course outline What is Bash programming.? how it is useful.? Bash Scripting template Every time you write the script First bash program Difference between single, double and reverse quotes Variables Positional Parameters Relational Operators Logical Operators Assignment Operators Boolean Operators Escape sequence if statement if statement with test command if-else statement if-else-if statement Nested if statement Case statement For Loop While Loop Until Loop Break, sleep, continue and Exit Functions Arrays Eval command Shifting parameters using shift command Input Filed Seperator Troubleshooting and Ebugging Shell Scripts Wrapup and Thanks.

#shell_scripting #unix_scripting #scripting Shell Scripting Tutorial-2 Linux Basics - Linux basic commands Features of Linux Flavors of Linux Linux Architecture Deep Understanding of Linux Architecture and flavors. Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9

HTTP stands for Hyper Text Transfer Protocol. Web Server is all to service you the data using HTTP protocol. Packages required for what is web server: yum install httpd* Configuration File: /etc/httpd/conf.d/httpd.conf Service name: systemctl start httpd.service #RHCE #Linux #Tutorial Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9

Using while loop example is to write/make any given number table printing on studout. Shell Scripting Tutorial for beginners, In while loop, first control checks the condition , if condition is true then only statements will be executed, after executing statements again control checks the condition , if condition is true then once again statements will be executed till given condition is false.

#rhcsa #linux_tutorial #trending In this Video session i have explained 26 Linux commands which are used in daily Linux administrator tasks. 1. date - To list Date and time of the Linux machine 2. touch command to create empty files 3. cat file to see the content in file 4. copy files and directories from source to destination 5. create empty directories 6. move or rename files and directories 7. delete empty directories 8. Remove/Delete files and directories 9. Change directory path from one location to another location 10. See last typed commands 11. List files and directories 12. See Disk Usage details 13. Know which path your currently working in 14. See long file content within screen 15. Know who logged into server 16. check user details and what is doing 17. clear the screen 18. list out all the process 19. change file and directory permissions 20. change ownership of files and directories 21. change group ownership 22. Create Zip files 23. Copy files to remote server 24. Check file size and directory size 25. search for files and directories 26. Look for file path Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#rhcsa #linux_tutorial #trending Extending Logical Volume size without interrupting your existing applications on that LVM. lvextend is the command to extended the RAW disk space but extending the file system in RAW disk use resize2fs. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

In this video explained What is shell scripting and It's Advantages.

RHEL7 RHCSA Soft Link vs Hard Link. Linking means reflecting to the original file, In case of copy command updating is not possible after copying the file from the source to destination. In link updating is possible for both the files. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 #RHCSA #LINUX_TUTORIAL #SOFTLINK #HARDLINK Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

RHEL7 Boot Process will like this see this video and understand complete picture. Poweron -- SMPS - Switched-mode Power Supply -- POST - Power On Self test -- BIOS - Basic Input Output System -- MBR - Master Boot Record -- 446 Bytes - Bootloader information -- 64 Bytes - Partition Information -- 2 Bytes - Magic bytes to identify errors -- GRUB - Grand Unified Boot Loader -- /boot/grub2/grub.conf -- 1 The 446 Byte file for stage 1 is named boot.img and does not contain the partition table which is added to the boot record separately. -- 1.5 The first partition on the hard drive begins at sector 63 and with the MBR in sector 0, that leaves 62 512-byte sectors—31,744 bytes—in which to store the core.img file which is stage 1.5 of GRUB. -- 2 The function of GRUB2 stage 2 is to locate and load a Linux kernel into RAM and turn control of the computer over to the kernel -- initramfs -- /sysroot - Read Only - compressed format will be extracted -- systemd - fork(); call -- Target will be loaded -- Services will be started -- User Interface #RHCSA #1_ON_TRENDING #LINUX_TUTORIAL #RHEL7 #Boot_Process Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#rhcsa #linux_tutorial #trending Yellowdog Updater, Modified - YUM Repository Configuration in RHEL 7 Step by Step Guide. In this video Session i have explained how to configure YUM repository using Installation DVD media content. Loaded plugins: product-id, subscription-manager This system is registered to Red Hat Subscription Management, but is not receiving updates. You can use subscription-manager to assign subscriptions. There are no enabled repos. Run "yum repolist all" to see the repos you have. You can enable repos with yum-config-manager --enable repo Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#rhcsa #linux_tutorial #trending In this video session explained how to configure sudoers to make normal user as superuser without providing them an root user password. After this sudoers configuration user can run commands as root privileges without login to root user. Sudo User Configuration Deep Dive - sudoers - visudo - Tech Arkit Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#shell_scripting #unix_scripting #scripting This is the best way to create your shell script template always standard and Uniq way of your style. Making Shell script template using shell script as a command.

Special variables shell scripting tutorial for beginners $* it stores the complete set of positional parameters as a single string $# It is set to the number of arguments specified $1 first argument $2 second argument $0 name of executed command "[email protected]" each quoted string treated as a seperate argument $? exit status of last command $$ PID of the current shell $! PID of the last background job

Logger makes entries in the system log. It provides a shell command interface to the syslog(3) system log module. Log the process id of the logger process with each line. logger command - Log Script Execution status into log file or syslog. Bash Programming Play List: https://www.youtube.com/watch?v=7GNUzvjS_mE&list=PL8cE5Nxf6M6b8qW7CSMsdKbEsPdG9pWfu Facebook Page: https://www.facebook.com/Linuxarkit/ LinkedIn Profile: https://www.linkedin.com/in/ravi-kumar-94530121 Google Plus: https://plus.google.com/u/0/+RedhatEnterpriseLinuxStepbyStepGuide Twitter: https://twitter.com/aravikumar48 RSS Feed: https://feedburner.google.com/fb/a/mailverify?uri=arkit Reddit: https://www.reddit.com/user/aravikumar48/ Tumblr: https://www.tumblr.com/blog/aravikumar48

In this video session explained about difference between scripting and programming. Scripting is not an programming language.

Red Hat Certified System Administrator - RHCSA PDF Book RHCSA: https://github.com/techtutorials/Linux-For-Beginners Play List: https://www.youtube.com/watch?v=BskRmjvWG5Y&list=PL8cE5Nxf6M6Y0lBYoJiIbGI-XbQueICqK RHCSA Content: https://arkit.co.in/one-linux-tutorial/ https://arkit.co.in/rhel7-rhcsa-exam-objectives-for-beginners/ https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/pdf/system_administrators_guide/Red_Hat_Enterprise_Linux-7-System_Administrators_Guide-en-US.pdf

DNS server is a computer server that contains a database of public IP addresses and their associated hostnames, and in most cases, serves to resolve, or translate, those common names to IP addresses as requested. DNS servers run special software and communicate with each other using special protocols. https://arkit.co.in/master-dns-configuration-linux/ #RHCE #Linux #Tutorial Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9

Squid Proxy Server is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web, DNS and other computer network lookup for a group of people sharing network resources, and aiding security by filtering traffic. Although primarily used for HTTP and FTP, Squid includes limited support for several other protocols including Internet Gopher, SSL, TLS and HTTPS. Squid does not support the SOCKS protocol. #RHCE #Linux #Tutorial Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9 Whatsapp Group: http://bit.ly/wappg Telegram Group: http://bit.ly/linux-telegram AWS Free Tier Account: http://bit.ly/aws-free-tier-account

set command is an inbuilt bash feature which is used to set positional parameters or assign any command output as positional parameters. Basically set is useful when you want to call particular portion in output.

#rhcsa #linux_tutorial #trending syslog server is used to store logs and analyze them. Based on criticality act on the events so that you can reduce the problems in server. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#shell_scripting #unix_scripting #scripting Shell Scripting Tutorial-4 Basic Commands touch command cat command ls command cd command date command cal command and pwd command

getopts optstring name [args]. getopts is used by shell procedures to parse positional parameters. optstring contains the option characters to be recognized; if a character is followed by a colon, the option is expected to have an argument, which should be separated from it by white space. The colon and question mark characters may not be used as option characters. Each time it is invoked, getopts places the next option in the shell variable name, initializing name if it does not exist, and the index of the next argument to be processed into the variable OPTIND. OPTIND is initialized to 1 each time the shell or a shell script is invoked. When an option requires an argument, getopts places that argument into the variable OPTARG. The shell does not reset OPTIND automatically; it must be manually reset between multiple calls to getopts within the same shell invocation if a new set of parameters is to be used. When the end of options is encountered, getopts exits with a return value greater than zero. OPTIND is set to the index of the first non-option argument, and name is set to ?. getopts normally parses the positional parameters, but if more arguments are given in args, getopts parses those instead.

Putty Trick Login to Linux server all the time using single mouse click. Putty Trick Login to Linux server all the times using single mouse click without SSH keys. This trick will help you in regular linux administration job because most of the of the times we login to servers by typing credentials multiple times make this configuration in place so that no need to type credentails in putty everytime just single click login.

grep command with 13 regular expressions. 1. Check Grep version #RHCSA #1_ON_TRENDING #Linux #grep grep -V 2. Search single word in single file / multi files grep string * 3. Search Multiple words in single file / multiple files grep -E 'word1|word2' 4. Seach text which is not maching to string grep -v "String" fileName 5. Print the matching string and its before lines grep ens33 -A 4 6. Print the matching string and its after lines and its around lines grep enss33 -B 4 grep ens33 -C 4 7. Search a string Recursively grep -r string fileName 8. Grep the string with highlighted in color grep --color=auto string file Name export GREP_COLOR='1;30;43' 9. display the lines which does not matches all the given strings grep -v -e "a" -e "b" -e "c" filename.txt 10. Get the count of given string from file grep -c string filename 11. Search for files which are matching to the given string grep -l this demo* 12. Beginning of line ^ using cap symble grep "^Nov 10" messages.1 13. End of the line $ using dollar symble grep "terminating.$" messages ? The preceding item is optional and matched at most once. * The preceding item will be matched zero or more times. + The preceding item will be matched one or more times. n The preceding item is matched exactly n times. n, The preceding item is matched n or more times. ,m The preceding item is matched at most m times. n,m The preceding item is matched at least n times, but not more than m times. From the above output you can come to know when all the messages has got interrupt. Just like ^ matches the beginning of the line only if it is the first character, $ matches the end of the line only if it is the last character in a regular expression. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

Use network teaming or bonding to configure aggregated network links between two Red Hat Enterprise Linux systems. Red Hat Certified Engineer Course. EX300 examination preparation guide. https://arkit.co.in/rhel7-how-to-configure-nic-teaming/ nmcli connection show nmcli connection add type team con-name team0 ifname team0 config '{"runner":{"name": "activebackup"}}' nmcli connection modify team0 ipv4.addresses 192.168.2.47/24 ipv4.gateway 192.168.2.2 ipv4.dns 192.168.2.2 connection.autoconnect yes ipv4.method manual nmcli connection add type team-slave con-name team0-port0 ifname ens37 master team0 nmcli connection add type team-slave con-name team0-port1 ifname ens38 master team0 nmcli connection show ip addr #RHCE #Linux #Tutorial #Teaming Youtube PlayLists RHCE: https://goo.gl/LGTmDK Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda | https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark | https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark | https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit | https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark | https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark | https://goo.gl/79zwX9

#SELinux #RHCSA #1_ON_TRENDING #Linux SELinux stands for Security Enhanced Linux which provide extra layer of security to the Linux servers based in applied security context matching mechanism. SELinux context can be enabled in three levels 1. Port Level 2. Service Level 3. File Level SELinux has three modes to work. 1. Enforcing: which means SeLinux is running with full enforcing mode, simple enabled mode. 2. Permissive: Permissive also says that SeLinux is running but it will not enforce, it will only logs the information. 3. Disabled: disable mode is simply disabled. SeLinux not in use. Immediately we get an question in mind that why there are three modes, Enable and disable modes are enough right. Yes, i also got the same question when i was learning SeLinux. There is a reason behind that. When we want to change the SeLinux mode from Enforcing to disabled we have to edit the configuration file /etc/selinux/config and change the SELINUX=disabled, config file will not be effected until unless server is rebooted. Same for the changing the disabled mode to Enforcing mode. but if you want to change Selinux mode from Enforcing to permissive doesn't required an reboot. Now we understand that why SeLinux is designed to have 3 modes. Whenever you change the SeLinux mode from disable to enforcing after the reboot it will relabel all the SeLinux policies. whenever you changed the SeLinux mode from Enforcing to Disabled after the reboot all the SeLinux policies will not go off, policies still exists but will not enforce. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

PATH Environment Variable | Life saver for Linux Administrators. How $PATH will help to execute Linux commands on Linux machine. If PATH variable is not configured properly then you have to each and every command using there exact path like /bin/commandname other wise command will not execute. Because of PATH variable commands will work if you execute without full path also. PATH variable will search whatever the command you executed in the terminal in all the specified paths. It's very important for Shell scripting.

#rhcsa #linux_tutorial #trending In this video i have explained How to modify Linux user properties Like change user login shell after user creation likewise change user home path, Lock user , Unlock User, Set User expiry date and so an. Setting User password age policy Like Last password change : May 01, 2018 Password expires : never Password inactive : never Account expires : never Minimum number of days between password change : 0 Maximum number of days between password change : 99999 Number of days of warning before password expires : 7 Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

IFS - Internal Field Separator in Shell Scripts. Using any separator value we can separator the content in shell scripts internally. Bash Programming Play List: https://www.youtube.com/watch?v=7GNUzvjS_mE&list=PL8cE5Nxf6M6b8qW7CSMsdKbEsPdG9pWfu Facebook Page: https://www.facebook.com/Linuxarkit/ LinkedIn Profile: https://www.linkedin.com/in/ravi-kumar-94530121 Google Plus: https://plus.google.com/u/0/+RedhatEnterpriseLinuxStepbyStepGuide Twitter: https://twitter.com/aravikumar48 RSS Feed: https://feedburner.google.com/fb/a/mailverify?uri=arkit Reddit: https://www.reddit.com/user/aravikumar48/ Tumblr: https://www.tumblr.com/blog/aravikumar48

#shell_scripting #unix_scripting #scripting Shell Scripting Tutorial-3 Linux Directory Structure. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

#rhcsa #linux_tutorial #trending A process is an instance of a computer program that is being executed. It contains the program code and its current activity. Depending on the operating system (OS), a process may be made up of multiple threads of execution that execute instructions concurrently. :: Process States :: 1. Running :- The Process is either running (it is the current process in the system) or it is ready to run (it is waiting to be assigned to one of the system's CPUs). 2. Waiting :- The process is waiting for an event or for a resource. Linux differentiates between two types of waiting process; interruptible and uninterruptible. Interruptible waiting processes can be interrupted by signals whereas uninterruptible waiting processes are waiting directly on hardware conditions and cannot be interrupted under any circumstances. 3. Stopped :- The Processes has been stopped, usually by receiveing a STOP signal. 4. Orphaned :- If a process exits with children still running (and doesn't kill its children;), those children are orphans. Orphaned children are immediately "adopted" by init (actually, I think most people call this "reparenting," but "adoption" ). An orphan is just a process. 5. Zombie :- This is a halted process which, for some reason, still has a task_struct data structure in the task vector. It is what it sounds like, a dead process. Zombies only occupy space in the process table. They take no memory or CPU. However, the process table is a finite resource, and excessive zombies can fill it, meaning that no other processes can launch. Beyond that, they are bothersome clutter, and should be strongly avoided. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

Debug Shell Scripts Or Troubleshooting Shell Script Errors using dos2unix command or shellcheck website. When Shell scripting not executing properly, you can use this tricks to correct them back. Facebook Page: https://www.facebook.com/Linuxarkit/ LinkedIn Profile: https://www.linkedin.com/in/ravi-kumar-94530121 Google Plus: https://plus.google.com/u/0/+RedhatEnterpriseLinuxStepbyStepGuide Twitter: https://twitter.com/aravikumar48 RSS Feed: https://feedburner.google.com/fb/a/mailverify?uri=arkit Reddit: https://www.reddit.com/user/aravikumar48/ Tumblr: https://www.tumblr.com/blog/aravikumar48

Swap memory in Linux ( swap file system) in Linux is used when the amount of RAM (Physical Memory) is Full. If system needs more memory resources and the RAM (Physical Memory) full, inactive pages in memory are moved to Swap Space. Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: t.me/Linux143 https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9

hi friends welcome to Tech Arkit YouTube channel my name is Ravi. In this video session we are going to see that how to interrupt boot process and get the access to the any Linux machine, whenever you have a physical access to the server. Let's see this so how you can do that. so first of all here I have the Linux machine switched-on. So i have a physical access to this machine when I click over here so I say that enter and I type the password over here but unfortunately the password is wrong. So I would like to reset this password or I would like to gain the access to the machine. I do not have the password in hand let's do that how you can get it. #RHEL7 #LINUX_TUTORIAL #REDHAT #LINUX so first of all I am going to reboot this machine, click restart, while machine has been restarting so I have to press space-bar to stop over here. The kernel process stopped over here. here in the kennel step it self what you can do is that so I can simply click are you sick and simply Say e for edit which means that I'm going to edit this kernel lines to interrupt the boot process. I just edited using the e and go down over here and wherever you see that Linux16 the line ok simply go to the end of that line and add rd.break console equal to tty1 so whenever you add this one what happens so whenever you add this one it says that you are entering your breaking this process and entering into the single user mode. by entering into the single user mode you get the access to the that machine so which means that you are in the single user mode It does not ask you any username and password just enter into the root directly ok. so now just press control x now the machine boot process would be interrupted and enter into the single user mode ok now which got into the single user mode directly can see that hash value over here to you which means that which is into root. type Mount command and see that all this files has been mounted as read only actually. so not mounts really into the rewrite options for here OK. are else you can also see the mount /sysroot over here already mounted and it is busy looks like ok so maybe you can grep /sysroot ok the root file system has been mounted but which shows here it is that /sysroot is in read only so whenever you have read only file system you cannot edit anything. it should be read write then only I can write anything on this file system. in-order to gain in-order to convert this into read/write just do this month -o remount,rw /sysroot and read/write this partition re-mount this mount point. With read write access /sysroot now you can see that using the above command now it is rewrite. just convert this /sysroot into actual root using the convert chroot innocent change chroot /sysroot now it becomes an root now type command called passwd which will ask you for the new password to enter the can now change the password over here so the password authentication has been changed. now you can reboot the machine but what happened here is that the by default RHEL7 enables the SELinux so without relabeling all your selinux policy are the contexts then you can not get the access really to the machine so in order to gain the success and reliable all selinux related stuff then what have to do is that you have to create empty file in the / (slash) so that it relabels automatically so in order to do that create touch / DAT auto relabel so be careful because if you misspell or if you do not properly create this file you cannot get the access are you cannot gain access to the machine. so in order to do that you have to be very careful whenever you are creating this file so confirm that the file has been created and exit from the process whenever you do exit 2 times it reboots the machine it relabels everything from the the contexts of the selinux then it starts the machine then you can enter into the username and password so that you will get the access. so now your PC has been turned on we can go to the user and type the password so actually reset the password called root user over here and enter the password. that's it you got into the machine see this your machine now you are into root user that's it so you simply gain this access by interrupting your kernel process whenever you have the physical access to that machine thanks for watching stay tune please subscribe the channel for more upcoming videos and courses

Shell Scripting we use symbols special characters like Tild, At, Minus sign, Plus Sign, Equal to, Question Mark, Star and so an.

#rhcsa #linux_tutorial #trending Crontab and at Commands - Automating Regular Tasks Youtube PlayLists Shell-Scripting: https://goo.gl/a1Hu3s Linux-Commands: https://goo.gl/QDoL7h RHCSA Certification: https://goo.gl/X2Ksqn Putty Software Tricks: https://goo.gl/MB1Do2 Linux OS: https://goo.gl/62p8s9 Follow Us on Social Media Telegram Group: https://goo.gl/KPvMda https://arkit.co.in/one-linux-tutorial/ Reddit: http://bit.ly/redditark https://goo.gl/mcUvef Mailing List: http://bit.ly/feedburnerark https://goo.gl/fb/WAU7JG Facebook: https://fb.com/linuxarkit https://goo.gl/2QN4sD LinkedIn: http://bit.ly/linkedark https://goo.gl/ZLcikC Twitter: https://twitter.com/aravikumar48 Google Plus: http://bit.ly/gplusark https://goo.gl/79zwX9 at 8:20pm at now +1min at 10:00 AM Sun at 10:00 AM July 25 at 10:00 AM 6/22/2018 at 10:00 AM 6.22.2018 at 10:00 AM next month at 10:00 AM tomorrow at now + 1 hour at teatime tomorrow at noon +4 days at 5pm august 3 2016 at midnight echo "sh backup.sh" | at 9:00 AM at -f /path_to_script time atq --To list all at scheduled jobs atrm --To delete scheduled 'at' job followed by job ID check the content of schedule jobs at -c Job ID Example of job definition: .---------------- minute 0 - 59 | .------------- hour 0 - 23 | | .---------- day of month 1 - 31 | | | .------- month 1 - 12 OR jan,feb,mar,apr ... | | | | .---- day of week 0 - 6 Sunday=0 or 7 | | | | | * * * * * user-name command to be executed

#shell_scripting #unix_scripting #scripting All quotation marks can be used based on the requirement. When double quotes are used and when single quotes are used and reverse quotes usage explained in detailed in this video session. Shell scripting video tutorial for beginners.

Shell Scripting Tutorial-6 diff and grep command with regular expressions

shift [n] The positional parameters from n+1 ... are renamed to $1 .... Param- eters represented by the numbers $# down to $#-n+1 are unset. n must be a non-negative number less than or equal to $#. If n is 0, no parameters are changed. If n is not given, it is assumed to be 1. If n is greater than $#, the positional parameters are not changed. The return status is greater than zero if n is greater than $# or less than zero; otherwise 0. Shift is an command it transfers the contents of a positional parameters to its immediate lower numbered one this is done as many times as the statement is called