Linux Copy One Hard Disk to Another Using dd Command

How can I copy one hard disk to another using the dd, ddrescue, or dcfldd commands?

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How to run script after mounting NFS with systemd in Linux

If you need to execute a shell script or command following the mounting of a particular file system in Linux using systemd, you can do so. For instance, you can run a backup task when a USB hard disk is mounted or adjust specific options at runtime when NFS is mounted.

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How to check ZFS File system storage pool on Linux/Unix

First, there is no fsck command for ZFS, which Linux and Unix use for file system repair. However, ZFS comes with a scrub option. This subcommand is a root-initiated dynamic consistency check. It runs in the background on a mounted live filesystem. Hence, we use the zpool scrub command for ZFS storage and test file system integrity. Let us see how to check ZFS File system storage pool on Linux, FreeBSD or Unix-like systems using the command-line option.

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How to switch boot target to text or GUI in systemd Linux

Most modern Linux distro uses systemd as init replacement. It is a suite of basic building blocks for Linux distros such as RHEL/CentOS & co, OpenSUSE/SUSE, Fedora, Arch, Debian, Ubuntu, and more. By default, most distro boot into GUI, but you can change to text or vice versa.

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How to set up ZFS ARC size on Ubuntu/Debian Linux

When working with Ubuntu, Debian Linux, and ZFS, you will run into ZFS cache size problems. You see, not all Ubuntu or Debian servers need aggressive file caching. Some servers act as a web server or run Linux container workloads or KVM guest VMs where you want those guest VMs to manage their own caching. Therefore, it would be best to have tons of ECC RAM for ZFS. Unfortunately, not all projects get that kind of extravagance in real life. This page explains how to set up ZFS arc size on Ubuntu/Debian or any Linux distro of your choice. So that, Linux kernel avoid running out of memory.

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How to restart systemd without rebooting Linux when critical libraries installed

Whenever we update a critical library such as OpenSSL, we need to restart any daemons that use the library. Systemd with PID 1 itself also uses OpenSSL. How do you restart the systemd daemon without rebooting Linux and other services such as Nginx, SSHD, Firewalld? Here are some tips.

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How to enable rc.local shell script on systemd while booting Linux system

We can easily enable rc.local shell script support on systemd while booting the Linux system. Traditionally, the shell script /etc/rc.local used by developers and Linux sysadmin to call other scripts or commands after all services are loaded. Typically /etc/rc.local get called at the end when Linux init switched to a multiuser runlevel. However, by default. /etc/rc.local support is disabled under systemd. This page shows how to enable and execute rc.local shell script during boot using systemd on Linux.

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How to create a Linux swap file

I am a new Linux system developer and user. How do I create a Linux swap file from the command line option for my cloud server? How can I add swap space on my Ubuntu 20.04 LTS or CentOS Linux 7/8 server?

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How to view status of a service on Linux using systemctl

How do I use the systemctl command to view status of a systemd service on Linux operating systems?

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How to extract tar.xz files in Linux and unzip all files

How do I extract tar.xz files in Linux? Can you tell me command to unzip linux-5.6.13.tar.xz file? How can I uncompressing (or decompressing) all files in the current directory?

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Systemd systemctl list all failed units/services on Linux

Is there is a command to print list all failed units or services when using systemd on Linux? Can you tell me the systemctl command to show failed services on Linux?

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Linux extend file system after resize disk volume

I increased the size of the volume in Linux using my cloud service providers' online tool. My original disk size was 200GB, and I grew to 400GB. However, I only able to use 200GB and not 400GB. How do I resizing my disk and extend the file system resizing a disk volume?

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How to check and list installed packages in CentOS Linux

How do I check installed packages in CentOS Linux version 6.x/7.x/8.x? How can I List installed packages on CentOS Enterprise Linux server?

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Change netplan renderer from networkd to NetworkManager

I prefer to use NetworkManager on my Ubuntu desktop, but currently, it is using networkd. As a result, I cannot set up or configure NetworkManager using GUI tools. Is there anyway to change netplan renderer from networkd to NetworkManager running on Ubuntu Linux? How can I change netplan renderer in Ubuntu Linux?

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Can I delete /var/cache/apt/archives for Ubuntu/Debian Linux?

I noticed that /var/cache/apt/archives/ taking lots of disk space on my AWS EC2 cloud server powered by Debian Linux. Can I delete /var/cache/apt/archives/ folder? Is it safe to remove all files? Do we absolutely necessary to keep all these files?

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How to upgrade Debian 9 to Debian 10 Buster using the CLI

I have Debian 9.x installed on AWS EC2. How do I upgrade Debian 9 Stretch to Debian 10 Buster using the apt command/apt-get command CLI? How can I upgrade Debian 9 to Debian 10 using ssh client?

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How to check RAID configuration in Linux

I need to check RAID configuration in Linux. How do you check your current software RAID configuration in a Linux-based server powered by RHEL/CentOS or Debian/Ubuntu Linux?

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How to install and use Nginx on OpenSUSE Linux server

How do I install and configure the latest version of Nginx web server on OpenSUSE Linux server using the CLI and host a static site?

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