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Systems Administration

Learn Your Tools

Just read a post by Drew DeVault: https://drewdevault.com/2020/11/06/Utility-vs-usability.html I very much agree. So many people treat working with computers as “I don’t like it but I have to do it.” Often these people learn only the minimum required to get something done. I think that, as professionals, we need to treat computers as tools to […]

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Linux Programming Systems Administration

Tips for doing “shell” scripting in Python

I’ve been moving a bunch of my shell scripts to python recently, because of how much better it handles the concept of “a process didn’t run successfully”. Consider the bash script: What happens here if Command 2 fails? Note that we still get the success message at the end – bash silently ignored our error-ing […]

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General Tech Linux Systems Administration

New Project – coconut-deadmanswitch – A tool to monitor Cron Jobs and Scheduled Tasks

I’ve started a new project! I recently talked about my experiments with coconut-lang here: https://jaytuckey.name/2020/10/25/thoughts-on-coconut-the-compile-to-python-functional-language-extension/ I’ve now started a project using coconut! It’s what I’m calling a “Dead Man’s Switch” (DMS) monitoring tool. The idea is this: Every cron job / scheduled task sends an update to the DMS monitor The monitor records the updates […]

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Linux Networking Systems Administration

A script to bring Cisco Switch VLAN data into phpIPAM

We have recently set up an IPAM at my workplace, the excellent phpIPAM – https://phpipam.net/ I went through our install and added all our subnets into the IPAM, but to make the data much more useful we wanted to have the VLAN information also: However, I didn’t want to go through by hand, adding each […]

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Linux Systems Administration

A bind9 Rest API tool – bind-rest-api

I made an API for bind9! Recently I have been looking for an api for a bind server. I found an existing project, https://github.com/dmyerscough/BIND-RESTful, which is quite nice but didn’t have some of the functionality I needed. I looked at updating the existing project, but instead decided to write a new API from scratch, inspired […]

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Linux Networking Systems Administration

A script to scan a network range and create Kea DHCP reservations for devices it finds

This script is very simple. It will scan a network range attached to the device it is run from, and will turn what it finds into a list of reservations for the Kea dhcp server – https://kea.readthedocs.io/ You run it something like this, giving it a network range to scan. Then network should be a […]

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Linux Systems Administration

How to find an open file smb file lock in a Dell Isilon Cluster

Commands were found here: https://www.dell.com/community/Isilon/Unlock-locked-file-on-Isilon-Share-via-MMC/td-p/7094821 My first thought for finding the open lock was to just use the MMC console on windows to find it, like this: However, it turns out that this will only show you the locks on a specific node, not the whole cluster. What you need to do is instead hop […]

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Linux Networking Systems Administration

Notes from debugging OSPF between cisco devices and Linux FRR ospfd configs

When trying to find why my ospf configs were not sending the correct costing from Linux -> Cisco devices, I found some useful commands that I thought I would note down for future reference. Linux – Using vtysh My ospfd.conf looks something like this: You can see the costs on linux using the vtysh command: […]

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Linux Systems Administration

My Favourite Tools in 2020 – Command line

Here are some tools that I really like using when I’m working from the command line: Fish shell The fish shell is an awesome shell with loads of autocomplete and helper tools: https://fishshell.com/ Mosh Mosh is an SSH replacement that has a much lower latency implementation: https://mosh.org/ Restic As the tagline says, backups done right! […]

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General Tech Linux Powershell Systems Administration

Making a simple phone notification tool using IFTTT – Available on a Free Account

I previously made a guide on how to create a notifier using Microsoft Power Automate: https://jaytuckey.name/2020/04/21/making-a-simple-phone-notification-tool-using-microsoft-power-automate-previously-microsoft-flow/ However, the Request trigger used in that flow is only available on a premium account so many people won’t be able to use it without a work account. For those people, here’s how to make the same thing using […]