Posts By: jonny

Docker jasonrivers/nagios Permissions Problem

I was running this docker image proxied via traefik but I was receiving an error message in the Nagios web interface: docker nagios Error: Could not read object configuration data And in the logs from the container:

To solve the issue I connected to the container:

And set the nagios user as the… Read more »

Determine Dell Hard Disk Location from Linux

On a Dell server I needed to determine the physical hard drive location for a faulty disk. Within the operating system the disk was mounted as /dev/sdk so I ran:

And from the output I could correlate this with the information in the iDRAC: So in this example disk 10 on the backplane.  

Dell racadm on Linux

I’m currently using Linux Mint and wanted to communicate with the iDRAC interfaces on Dell servers. Install racadm:

Test with:

or if you want to be prompted for login credentials use:

Example racadm commands Dump lots of info:

Get the status of the PERC/Raid battery:

Set… Read more »

Command Line Optimise JPEG image

This command significantly improved file size on disk although the quality value can be increased to adjust the image quality versus file size:

 

Cropping / Masking a Video for Kdenlive

I was helping a friend with creating a video and we need to mask out the distracting content around the video subject. If I had this problem with a static image I would use Gimp and the ‘Crop’ tool but I couldn’t find anything in Kdenlive to allow me to crop out a small square… Read more »

Managing RDP Remote Desktop Sessions/Users

RDP Session Manager

It took me a little digging to re-discover the name of this tool that allows remotely logging RDP users off from other servers so I thought I would write it down in case I need a reminder. The command to run is: tsadmin.msc Or it can be added directly from the MMC.

Laravel Quick Start

Quick reminder of steps to setup a Laravel project on Ubuntu/Linux Mint and similar. First install composer:

Install PHP dependencies:

  Use composer to create your Laravel project:

Install composer.json packages:

Generate a key for your new project into the .env file:

Amend the .env file with database details and anything else you want to customise. You may want to install mysql with

Auth Scaffolding Create the login and… Read more »

Resetting Root Password in Single User Mode

Using Red Hat  / CentOS etc one method of resetting the root user password is to boot into single user mode. To do so, interrupt the booting process if necessary so that you see the Grub boot menu: Press the ‘e‘ keyboard button to edit the boot parameters. You will see a menu with the… Read more »

Password-less Login to the MySQL Command Line

The goal here was to be able to log in to the MySQL command prompt be simply typing

rather than:

This is particularly useful for automation of routine backups etc. mysql_config_editor The command mysql_config_editor has several options (e.g. add, remove, print) for managing encrypted passwords. To create a new login

It is… Read more »

Connecting in to Docker MySQL Instance

Just recording a few of these steps for future reference. Pull the MySQL image from the hub:

Run an instance:

Run a shell on the instance:

Once inside the instance use the MySQL client:

and create a new user:

Quit the MySQL client and exit the instance. From the host… Read more »