I encounter strange virtual machines with Invalid (Unknown) status on VMware ESXi hosts on several occasions. In this article, we’ll take a look at how to troubleshoot and fix the invalid state of virtual machines from the VMware ESXi command line.
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Proxy servers (such as the Squid proxy) are often used in corporate networks to provide access to the Internet for internal devices. In order for your internal Ubuntu/Debian hosts to be able to install and update deb packages from external repositories, you need to configure the proxy settings for the APT (Advanced Packaging Tool) package manager. This article describes how to configure proxy connection settings for APT.
If you are installing the MSI package in silent mode (using the /qn switch), you can set additional application installation options on the command line. Developers can add additional (hidden) installation options to MSI packages that are only configured in the GUI when the application is installed. This article shows you how to get all the command line installation options available for an MSI package on Windows.
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On Linux, the chcpu console tool allows you to temporarily enable or disable processor cores without rebooting.
In this article, we’ll show you how to set the timezone from the Ubuntu command line.
If you are deploying a Linux virtual machine on a Hyper-V host, you must install Linux Integration Services (LIS) in the guest operating system. Hyper-V Linux Integration Services allow the guest OS to interact with the host: send its state to the hypervisor, perform backups via VSS, correctly reboot and shutdown the Linux guest. In this tutorial, we’ll take a look at how to install Hyper-V Linux Integration Services on popular Linux distros – CentOS, Debian, and Ubuntu.
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VMware ESXi image includes the common drivers for the most popular server platforms. Many vendors provide their own custom ESXi images with native drivers for their hardware (HPE, Lenovo, Fujitsu, Dell, Cisco, etc.). If you want to install and use VMware ESXi on non-standard or legacy hardware, or even on a home computer, you will need to download and install the drivers yourself. In this article, we will show you how to manually install the device driver on VMware ESXi.
This cheat sheet is a collection of useful Postfix commands that I use frequently. The following five console commands are mainly used to manage postfix:
You may get a device is busy error when you try to unmount a partition in Linux using the umount command:
Continue reading “Can’t Unmount Linux Partition: Umount – Device is Busy”
Let’s say you want to be notified every time someone connects to your Linux hosts via SSH. This article shows how to configure the Zabbix trigger to notify you when a user logs in to a Linux host using SSH.
Continue reading “Enable Zabbix Alert for SSH Login on Linux”
