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2233 articles
Ansible Architecture
The important terminologies which we have in an Ansible Architecture are control node, managed nodes, tasks, play, playbook and many more..
Ansible Installation Guide on RHEL/CentOS 8
There are different methods using which you can install ansible using default package manager such as yum, dnf, apt, Using pip and using source compile file
How to provision AWS EC2 Instances using Ansible
How to provision AWS EC2 instances using ansible playbook. Create, launch, start, stop and terminate instances using tags and instance id with ec2 module
5 system tools to monitor network traffic in Linux with examples
How to monitor network traffic in Linux? How to monitor application network traffic real time in Linux? How to perform speed test using command line in Linux? …
How to Check Linux Kernel Version from Command Line
Learn how to check Linux kernel version with tested uname, hostnamectl, procfs, journalctl, dmesg, boot image, dpkg, and apt commands, and understand the …
4 useful methods to automate ssh login with password in Linux
How to automate SSH login with password? How to pass password to scp command used in bash script ? How to perform SSH login with password instead of using …
Bash increment variable: add 1, counters, loops, and `(( ))` vs `$(( ))`
Bash increment variable and bash add 1 to variable with $(( )), ((++)), bash increment variable in loop (for/while), bash increment counter patterns, let, and …
Bash script arguments and parameters: `$1`, `$#`, `shift`, and parsing flags
Bash script arguments and bash script parameters with $0–$9, $#, "$@", shift, and a while/case example; missing-flag values, $# checks, and links to getopts and …
Bash concatenate strings: join, append (`+=`), separators, and newlines
Bash concatenate strings and bash string concat with ${a}${b}, bash append to string using +=, join strings with separators, brace pitfalls (${var}_), loops, …
How to properly remove old kernels RHEL/CentOS 8
You can now use dnf command to remove old kernels from RHEL/CentOS 8 Linux. package-cleanup doesn't work any more. Use oldinstallonly with installonly_limit
Bash getopts: optstring, OPTIND, leading colon, and getopt vs getopts
Bash getopts tutorial: optstring, OPTARG, OPTIND, opterr, bash getopts leading colon behavior for missing option arguments vs invalid options, bash getopts …
Bashrc vs bash_profile: login vs non-login shells, .profile, and /etc/skel
Bashrc vs bash_profile and profile vs bashrc: when Bash reads ~/.bashrc, ~/.bash_profile, and ~/.profile on login and new terminals, Debian vs Red Hat patterns, …
Bash check if file exists: [[ -f ]], test, symlinks, and Linux examples
Bash check if file exists with [[ -f ]], test -e, and [ ]; bash if file exists patterns with if/else; symlinks and broken links; check if file exists on Linux …
How to access VirtualBox shared folder at startup with systemd in Linux
How to mount Oracle VirtualBox shared folder using systemd unit file at system startup? How to execute a script during reboot on the shared folder from Vbox …
How to start systemd service after NFS mount in Linux
How to execute a script after a network file system is mounted? How to start a systemd service only after NFS share is mounted and available in Linux