Another DNSBL Shuts Down: Farewell to spamtrap.drbl.drand.net
If your monitoring system woke you up today with news of your servers blacklisted on a DNSBL, take note. Another DNSBL has disappeared from the Internet scen...
Posts by Category
- Linux 11
- linux 8
- Linux, 5
- oracle 2
- ruby 2
- ansible 2
- Oracle 2
- Security 2
- ssh 1
- fail2ban 1
- security 1
- ubuntu 1
- bash 1
- Ruby 1
- Swap 1
- Ubuntu 1
- OpenVPN, 1
- OpenSSL 1
Linux
Saving Permissions for Files and Directories
Archiving permissions for files and directories can often prove to be a valuable practice, especially in scenarios where system configurations or access requ...
Discovering Linux Kernel Parameters for the Current Booted System
Linux administrators often need to retrieve information about the kernel parameters of their system to troubleshoot issues, optimize performance, or understa...
How to Retrieve Linux Kernel Parameters for the Current System Configuration
Linux administrators often need to retrieve information about the kernel parameters of their system to troubleshoot issues, optimize performance, or understa...
Linux Command History: An Introduction
In the vast realm of Linux, mastering the command line is a valuable skill that empowers users to navigate, control, and customize their systems with precisi...
Faster Recovery from a Disk with Bad Sectors with ddrescue
If you’re dealing with a disk that has bad sectors and you want to recover data from it as quickly as possible using ddrescue, there are a few strategies you...
Three Methods to Find the Biggest Folder in Linux
Here are three commonly used methods:
Three Methods for Managing User Group Memberships in Linux
Today, I will show you three methods of managing user group membership in Linux, along with examples. Managing user groups is an essential aspect of system a...
Best Ways to Find CPU Information on Linux
If you want to find specific information about your Linux processor or check what CPU you have, there are two methods you can use.
Check Your Ubuntu Version: Popular Methods
Have you ever forgotten which version of Ubuntu you have installed? If so, this article is definitely for you.
Howto add swap space without repartitiong disk
To add swap space online without repartitioning, you can create a swap file instead of resizing the swap partition. Here are the steps to follow:
linux
How to Automatically Add odd_or_even in a Loop
When working with Ruby loops, there may be times when you need to distinguish between odd and even elements. While you can utilize the ActiveSupport cycle he...
Ansible loops - howto control loops
Ansible, a powerful automation tool, empowers system administrators and DevOps engineers to streamline their infrastructure management tasks. One of Ansible’...
Working with ansible loops
Ansible provides various loop constructs that allow you to iterate over lists, dictionaries, and other data structures. Loops are useful for performing repet...
Less Known Bash Variables
Bash, the popular command-line shell for Unix-like systems, offers a wide range of variables that provide control and customization options for your shell en...
How to Check if a Variable is Defined in Ruby
Sometimes, it’s necessary to check whether a variable is defined or not in your Ruby code. In this section, we will explore two common approaches to accompli...
How to List Files in a Directory with Ruby
Often, you may need to obtain a listing of files from a specific directory for your administrative tasks or scripts. Fortunately, it’s quite simple to accomp...
Ways to Find Your Ubuntu Version
Have you ever forgotten which Ubuntu version you are using? If that’s the case, here are some methods to check the Ubuntu version currently running on your s...
Discovering Linux CPU Information: Methods and Tools
Finding Linux CPU information is essential for understanding the hardware specifications of your system. There are several methods to retrieve processor info...
Linux,
Practical Approach for OpenVPN CA Certificate Renewal
If you’re managing an OpenVPN infrastructure and your CA (Certificate Authority) certificate is nearing expiration, a practical approach can help you smoothl...
Transitioning Away from MD5 Signed Certificates
Since its discovery of vulnerabilities in 2005, the usage of MD5 as a certificate signing algorithm has been strongly discouraged due to its susceptibility t...
Troubleshooting ORA-01658: Unable to Create INITIAL Extent for Segment in Tablespace
When encountering the ORA-01658 error in Oracle Database, it signifies a failure to allocate an initial extent for a segment in a specified tablespace. This ...
Exploring the Lesser-Known Command: lastb
In the realm of Unix-like operating systems, particularly Linux, there exists a wealth of commands that cater to various administrative needs, ranging from m...
Managing Disk Space Limitations in Oracle: Extending DB_RECOVERY_FILE_DEST_SIZE
In the realm of Oracle database management, encountering limitations on disk space allocation is not uncommon. One specific error that may arise due to such ...
oracle
Troubleshooting ORA-01658: unable to create INITIAL extent for segment in tablespace
Lately, I’ve encountered an issue with insufficient free space in one of Oracle’s tables. This problem arose because I failed to utilize the AUTOEXTEND optio...
Understanding Oracle Initialization Parameters: SPFile vs PFile
Oracle database instances rely on initialization parameters to configure their behavior. Two common types of initialization files used by Oracle are SPFile (...
ruby
How to Check if a Variable is Defined in Ruby
Sometimes, it’s necessary to check whether a variable is defined or not in your Ruby code. In this section, we will explore two common approaches to accompli...
How to List Files in a Directory with Ruby
Often, you may need to obtain a listing of files from a specific directory for your administrative tasks or scripts. Fortunately, it’s quite simple to accomp...
ansible
Ansible loops - howto control loops
Ansible, a powerful automation tool, empowers system administrators and DevOps engineers to streamline their infrastructure management tasks. One of Ansible’...
Working with ansible loops
Ansible provides various loop constructs that allow you to iterate over lists, dictionaries, and other data structures. Loops are useful for performing repet...
Oracle
Troubleshooting ORA-01658: Unable to Create INITIAL Extent for Segment in Tablespace
When encountering the ORA-01658 error in Oracle Database, it signifies a failure to allocate an initial extent for a segment in a specified tablespace. This ...
Managing Disk Space Limitations in Oracle: Extending DB_RECOVERY_FILE_DEST_SIZE
In the realm of Oracle database management, encountering limitations on disk space allocation is not uncommon. One specific error that may arise due to such ...
Security
Transitioning Away from MD5 Signed Certificates
Since its discovery of vulnerabilities in 2005, the usage of MD5 as a certificate signing algorithm has been strongly discouraged due to its susceptibility t...
Exploring the Lesser-Known Command: lastb
In the realm of Unix-like operating systems, particularly Linux, there exists a wealth of commands that cater to various administrative needs, ranging from m...
ssh
Regenerating Remote SSH Server Keys on Linux and Windows
In the world of secure communication, SSH (Secure Shell) is widely used for remote access to servers. SSH relies on cryptographic keys to authenticate and en...
fail2ban
Introduction to Fail2Ban: Protecting Your System from Unauthorized Access Attempts
In today’s interconnected world, securing your computer systems and servers from unauthorized access attempts is of utmost importance. Malicious actors conti...
security
Introduction to Fail2Ban: Protecting Your System from Unauthorized Access Attempts
In today’s interconnected world, securing your computer systems and servers from unauthorized access attempts is of utmost importance. Malicious actors conti...
ubuntu
Ways to Find Your Ubuntu Version
Have you ever forgotten which Ubuntu version you are using? If that’s the case, here are some methods to check the Ubuntu version currently running on your s...
bash
Less Known Bash Variables
Bash, the popular command-line shell for Unix-like systems, offers a wide range of variables that provide control and customization options for your shell en...
Ruby
How to Automatically Add odd_or_even in a Loop
When working with Ruby loops, there may be times when you need to distinguish between odd and even elements. While you can utilize the ActiveSupport cycle he...
Swap
Howto add swap space without repartitiong disk
To add swap space online without repartitioning, you can create a swap file instead of resizing the swap partition. Here are the steps to follow:
Ubuntu
Check Your Ubuntu Version: Popular Methods
Have you ever forgotten which version of Ubuntu you have installed? If so, this article is definitely for you.
OpenVPN,
Practical Approach for OpenVPN CA Certificate Renewal
If you’re managing an OpenVPN infrastructure and your CA (Certificate Authority) certificate is nearing expiration, a practical approach can help you smoothl...
OpenSSL
Practical Approach for OpenVPN CA Certificate Renewal
If you’re managing an OpenVPN infrastructure and your CA (Certificate Authority) certificate is nearing expiration, a practical approach can help you smoothl...