You may find Ad-hoc mode (from Part II) easy to use on day-to-day tasks such as for quick systems checks or when updating a config file on multiple systems. Stepping up simple ad-hoc commands are Ansible playbooks (from Part III) and Ansible roles which are very powerful ways to utilize Ansible’s features.
Continue reading “Ansible Part IV: Roles Overview”Tag: Red Hat
Red Hat Linux
Ansible Part III: Using Playbooks
The Ansible cases we tested so far from Part I and Part II are what we call ad-hoc mode. If you are pretty comfortable on combining these ad-hoc commands and bash scripts, you can do a lot of work for a small amount of time. But Ansible can offer a lot more features. We’ll explore creating Ansible playbooks on this part.
Continue reading “Ansible Part III: Using Playbooks”Ansible Part II: Using Modules
On the first part of this series, you learned how to setup and configure Ansible. Part II explains how Ansible modules work and how you can use Ansible in ad-hoc mode from the command line.
Continue reading “Ansible Part II: Using Modules”The Linux Filesystem Explained
Have you ever wondered what all the folders on the root (/) directory of the Linux filesystem are for? Which file goes into which directories and why are they saved in those directories? On this post, we’ll check out each folder and what purpose or function they serve for the operating system itself. Continue reading “The Linux Filesystem Explained”
Comparing files using the diff command
The diff command outputs the differences between two files, line by line. For files that are identical it produces no output, for binary files only reports if they are different or not.
The set of differences produced by diff is often called a diff or patch, and this output can be used later on by the patch command to change other files. Continue reading “Comparing files using the diff command”
How To Tell If Your Linux Server Has Been Compromised
A server being compromised or hacked for the purpose of this guide is an unauthorized person or bot logging into the server in order to use it for their own, usually negative ends. However, the majority of compromised servers are carried out by bots i.e. automated attack programs, in-experienced attackers e.g. “script kiddies”, or dumb criminals. These sorts of attackers will abuse the server for all it’s worth whilst they have access to it and take few precautions to hide what they are doing.
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How to effectively use the GREP command
Grep is a very important & powerful Linux commands. It stands for ‘Global Regular Expression Print’ & is used for matching & printing a search pattern or a regular expression from a single or multiple text files. It will look for the pattern if the mentioned files & will than print the result on screen or to an output file.
In this tutorial, we are going to learn to use grep command with examples. Continue reading “How to effectively use the GREP command”
bash Tips and Tricks
I call these tips and tricks – “bash kung-fu”. You can save a lot of typing with these handy bash features.
bash, or the Bourne again shell, is the default shell in most Linux distributions. It has many features to enhance user-friendliness and productivity. Unfortunately, you can’t take advantage of those features unless you know they exist. So here are some bash tips and tricks that will help you with your everyday system admin tasks.
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