Reverse Path Filtering (rp_filter) and Martians (log_martians) for LPIC-3 Security The IPv4 setting for rp_filter or Reverse Path filtering is a method used by the Linux Kernel to help prevent attacks used by Spoofing IP Addresses, yes the Internet is not a safe place and people aren’t always whom they say they are. Reverse path […]
Linux
Installing the Linux Audit System on Ubuntu 18.04
The Linux Audit System is a great facility but is not install on Ubuntu be default. As we have seen, previously, CentOS does not need us to install the audit system, it ships as standard. If you are using Ubuntu, though, this is probably something you would want to install and we step you through […]
3.2 Searching and Extracting Data from Files
In this blog we step you through the process of searching and extracting data from files at the Linux command line. The Linux command line is built around many small commands. The output from one command can be sent to the input of another. Piping is sending the output from one command to the input of […]
Counting Files and Directories in Linux
How do you count the number of files or directories in Linux? In his blog we show you how to count files in a directory or the number of subdirectories. So when you are ready we shall begin! Although at first counting files and directories in Linux may not seem the most exciting topic you […]
Automating MariaDB Deployment on Red Hat Enterprise Linux 8
In this blog we look at Automating MariaDB Deployment on Red Hat Enterprise Linux 8 using MariaDB 10.4 from the MariaDB.org repo. Using only the Red Hat repositories RHEL 8 will supply MariaDB 10.3. Whilst this is ok there are improvements that you should be aware of in version 10.4 which can be installed directly […]
Applying Security Updates to Red Hat Enterprise Linux 8
In this blog we take a look at applying security updates to Red Hat Enterprise Linux 8. If you are used to using CentOS 8 then you may not have come across this feature as the package metadata is not available CentOS. If you have access to AWS you can use RHEL 8 in the […]