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Channel: Linux Administration Archives - Experiencing Technology
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Change Date and Time format for LinuxMint panel applet

Modern Linux distributions like LinuxMint provide a nice GUI which is highly configurable. There are so many options and possibilities that most users new to it cannot find where things are configured....

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Get vim to paste content without modification

When content is pasted into vim, it tries to automatically detect and re-indent the content. This works most of the time but sometimes it does not, and that can be annoying, but vim would not be so...

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Harden SSH server settings

Many Linux Administrators use ssh on a daily basis. Many of the ssh servers are in their default configuration. Not changing the default configuration puts the security of the server at risk. That is...

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Automount a luks encrypted volume on system start

Linux supports encrypted volumes with luks. When a luks encrypted volume is set up during installation to be booted from, the volume is already configured and set up. When an encrypted volume is set up...

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Debug SSH Connection issue in key exchange

Securing a server means hardening the SSH server settings, but doing so can also cause issues with ssh clients. Finding the cipher or algorithm causing a failled connection can be tricky. Depending on...

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Verifying SSH configuration with a scan

Managing a number of Linux servers and keeping them secure can be a challenge. Certain tools can make the life of an admin a lot easier. To ensure an ssh daemon complies with a desired security...

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How to get scrollbar arrows in Linux Mint 17

Linux Mint is missing the scrollbar arrow buttons at the end of the scrollbars. There are situations in which those buttons can be very useful. This how-to will explain how to get them back. Sadly I...

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Permanently reject a specific email sender address using postfix

Postfix generally accepts all sender addresses. It might be needed in some rare cases to reject one sender addresses for some reason. With postfix, there is the possibility to use the...

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Increase the size of a LUKS encrypted partition

Even encrypted discs or partitions sometimes need to have their size increased. A LUKS encrypted volume consists of different layers which all need to be resized. To resize an encrypted volume,...

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apt – install the package that contains a specific file

Sometimes a command that you execute complains about a dependency being missing on the system. From the file name in the error message it is often not possible to know exactly which package needs to be...

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Linux Mint – Mount an NFS share automatically

Linux Mint comes pre-installed with all components to mount Windows File sharing (SMB/CIFS) but does not support NFS out of the box. The following post will explain how to enable Linux Mint to mount a...

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Create hardware raid on HP via hpacucli

Configuring a new hardware raid on a HP server can be done comfortably from the Linux command line without restarting the server. HP provides a small command line tool for this job. The following shows...

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Testing environment setup using Vagrant

Setting up a test environment with many different operating systems and versions can be a time consuming task. Installing the different operating systems and configuring them for tests or development...

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Mount raw image of entire disc

Raw disc images are very common, they include things like images created using dd for backups and virtual machine disk images. To access the disc image content means the disk image needs to be mounted....

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Align a partition on a hard disk

New disks need to be prepared for use. When using a hardware raid like explained in Create hardware raid on HP via hpacucli some partitioning tools even show an error message. To prepare a disk for...

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Find and extract one file from rpm package

Extracting a configuration file (or any other single file) from a package which is not installed is not a standard operation on rpm based systems, but with the following few steps, a file can be...

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Manage SELinux boolean policies

Configuring a new service often means dealing with SELinux. The easiest way is most of the time to set an SELinux boolean. But what are SELiunx booleans and what exactly do they do? I will try to shed...

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Extend logrotate for additional log files

The Linux operating system consists of many different components. Many of them log their activity directly or indirectly into log files. Over time those log files grow and would eventually fill up the...

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Setup LVM and create logical volume

Creating an LVM on a disc / partition allows for a lot of flexibility in managing the storage. Managing a disc using LVM consists of a number of steps, from preparing the disc itself until mounting a...

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Docker container on RHEL fails to start without error

Recently a Docker container refused to start for me without any hint about why in the OS or Docker container’s logs. It turns out that SELinux jumped in and blocked access without logging its...

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LVM Remove physical volume from volume group

LVM provides flexibility to organize logical volumes without being bound to inflexible partitioning. If set-up correctly, the LVM can grow as the disk/raid might grow. To allow the LVM to grow, the...

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Install HP ProLiant Management Utilities

The HP ProLiant Support Pack (PSP) for Linux allows reading out hardware details from a HP ProLiant server. this set of tools can be used to read out hardware information, state and logs. Install HP...

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Manage terminal sessions with tmux

In Managing shell commands and processes a utility called screen was introduced, but screen is not the only utility to manage multiple sessions. Another mighty tool to handle multiple sessions is tmux....

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Setup sftp only account using openssh and ssh-key

There are different ways to lock a user into his home directory. A very special case is to grant sftp-only access, which does not require a full chroot jail to be set up. The sftp subsystem built into...

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Force Debian console into text mode

Modern server hardware offers a lot of possibilities for administration. One of them is the remote access port, HP’s iLO. This remote access port allows to access the server even when shut down and...

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MacOS Dash alternative for Linux

The handy utility Dash – Offline access to documentation is sadly only available for MacOS, but there are compatible alternatives available to let you browse documentation offline on Linux. Zeal –...

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Setup Unifi Network Controller on a Raspberry Pi

Unifi access points from Ubiquiti cannot be configured like normal, standalone access points. They require a special network component called Unifi Controller. This controller is a piece of Software...

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Download a complete website using wget

In some rare cases you might run into the need to download a complete website onto your local machine for offline usage. There are many GUI tools to do this with loads of options. But did you know that...

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Setup WireGuard VPN on CentOS

WireGuard provides a modern VPN and is advertised as being much easier to install and configure than many other VPN services. Most of this simpler setup procedure comes from the fact that the...

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Verify installed rpm packages

Installing packages via rpm usually provides a lot of comfort. Simply installing an rpm deploys all files related to that package wherever they need to go across the system. Some packages distribute...

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