To track changes to the Linux file system and report changes to apps, the inotify kernel subsystem can be used. For example, when a file or directory is created, modified, read, or deleted, inotify allows a specific action (command, script) to be executed.
Continue reading “Monitor File or Directory Changes in Linux with Systemd”
When the Linux operating system is installed on a computer, a unique machine identifier is automatically generated and saved in the /etc/machine-id file. This is similar to the Computer Security Identifier (Machine SID) in Windows.
Continue reading “How to Reset the Machine-ID of a Linux VM”
In this article, we will look at how to connect to a Microsoft SQL Server database from a Linux host (Ubuntu in this example) using an ODBC driver.
Continue reading “Connect to MS SQL Server from Linux Using ODBC Driver”
In this article, we will look at how to completely disable system logging on Linux host (including /var/log, journald, and bash command history).
Some people find that they still get popup reminders for some events even after they have deleted some events from their Outlook calendar, or even after removing the entire calendar. The problem occurs with deleted and canceled meetings in the Outlook desktop client when you have mailboxes hosted on the Exchange Server or Microsoft 365.
Continue reading “Stop Receiving Reminders from Deleted Calendar in Outlook”
An error may occur when updating the apt deb package manager cache on Linux (Ubuntu or Debian distros):
$ apt-get updateW: There is no public key available for the following key IDs: 467B942D3A79BD29
W: GPG error: https://repo.mysql.com/apt/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 467B942D3A79BD29
Continue reading “Fix: apt-get – there is no public key available”
In some cases, when connecting to a Linux host via SSH, there can be a very long delay before a password prompt appears (from 30 seconds up to 2 minutes).
On most modern Linux distros, you can enable the local caching of DNS queries by using the built-in systemd-resolved service. In this article, we will take a look at how to speed up the resolution of DNS queries by using systemd-resolved local client caching on Debian and Ubuntu. This allows you to reduce DNS resolution delays if you have an unstable network connection, when DNSSEC is enabled, and on hosts that make a large number of DNS queries (for example, mail servers).
Modern versions of Ubuntu offer many different ways to configure network settings, and it’s easy to get confused. In this article, we will have a look at how to configure network settings in Ubuntu using Network Manager, Systemd Networkd, Netplan, and the static configuration file /etc/network/interfaces (legacy way).
Continue reading “Configure Network Settings on Ubuntu (Network Manager, Systemd and Netplan)”
Before starting an in-place upgrade from Debian 11 to the new Debian 12 (Bookworm), we recommend backing up your operating system.
Continue reading “Updating Debian 11 to Debian 12 (Bookworm)”
