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Notes by a Sysadmin


Cluster | Philosophy | Stack

sysadmin

Stack

Stack setup and maintenance

HomeBrew

January 26, 2022 |

The Open Source package manager for macOS

Though this package manager is also available for Linux, the chances are that you've mostly heard of it in relation to Apple's macOS. Why install such a tool on your macOS, does'nt it increase voulnerbillity of a generally secure operating system with all of Apple's validation... Read more


OPNsense ProtonVPN setup

November 11, 2021 |

If you have a desent firewall, having some dedicated interfaces with VPN from the firewall out may be a great idea because it can help with.


KVM hypervisor

October 16, 2021 |

There is a lot of different hypervisors and virtual machine managers out there. After using a commercial Type-2 hypervisor for many years, I have started to use KVM whenever possible. 

What is KVM?

KVM is native to all linux systems today, it works directly on the kernel level and is considered as a Type-1... Read more


Sudoer without password

July 17, 2021 |

There may be occations where some tasks, that usually requires root privileges, would be more handy to run without the need to provide a password.

In this example it is an automation for update, upgrade and reboot. Ofcause it is not advisable to run all sudo commands without providing passwords, in particular not on a... Read more


Tmux

April 20, 2021 |

There are two popular tools for working with screens/sessions in the terminal; Screen and Tmux. Screen is probably to consider the most native and simple of the two. But, this post will be about the Tmux application.

It does not come as native in contrary to Screen, so you have to install it:

Read more

NFS-Share (shared storage)

April 9, 2021 |

Preparation of a USB 3.x storage

By default one could use the Pi's internal SD-card for storage. But, for many reasons - as stabillity and speed - external storage like an USB 3.x stick on a Pi 4 would be preferable.

Find the node you would like to hold your storage device, and SSH in to the node. And locate the... Read more


New Pi Setup

April 9, 2021 |

Install OS

Install the Pi Imager tool from Raspberry Pi's homepage: https://www.raspberrypi.org/software/ 

Insert your SD-card in your PC, and select OS (choose an 64-bit version if you are running Rpi 3 < ) and SD-card and continue..

Read more


SSH Key exchange

April 9, 2021 |

If you have never generated a key on your system, or if you want a separate key. Do the following:

ssh-keygen

And following the instructions. Just press enter all way thru, if you do this for the first... Read more


Ubuntu for Pi (arm) mDNS

March 18, 2021 |

Resently I experienced that my pi's with an ubuntu install did'nt resolve in my routers DNS server. The following mDNS install on the pi will solve that problem.

sudo hostnamectl set-hostname [your-pi-name]

 followed by:

sudo apt...         Read more
            

Mail sending from a Raspberry Pi

February 12, 2021 |

Mail notifications

The reason you might want mail sending (smtp) capabillity on a Pi, is notifications. This is a nice feature, if some thing goes wrong as Pi's are often setup headless for a specific task. 

Start by setting up mailutils and postfix:

 sudo apt install...         Read more
            


Rclone setup on Raspberry Pi - Part 1

January 22, 2021 |

There are a lot of backup tools available out there and depending on what the goal is, one should consider what meets the needs. Basically there are different kinds of backup setups:

  • Client-side backup solutions (applications on your devices), few devices 
  • Server/agent (central server and a script on the... Read more

Geo-blocking with iptables

January 16, 2021 |

OS: Ubuntu 20.04
Firewall: UFW

Unfortunately there is no easy solution or "out of the box" features, implemented in most UNIX-like system, for blocking connections by country. But, in a lot of real life cases it would make a lot of sense to implement. Say; you have a website written in Swedish and only expected people... Read more


New server setup (debian)

January 12, 2021 |

Setting up a new server can be a repetitve task. The following is a LAMP stack setup (Linux, Apache(2), MySQL (could be MariaDB), PHP).

First spin up an instance/VPS/PS of your OS. If you are not very familiar with the UNIX-like world, choose a Debian based OS (such as Debian or Ubuntu) with long term support (LTS). By... Read more


About

I'm a Sysadmin, network manager and cyber security entusiast. The main purpose of this public "notebook" is for referencing repetitive tasks, but it might as well come in handy to others. Windows can not be supported! But all other OS compliant with the POSIX-standard can (with minor adjustments) apply the configs on the site. It is Mac OSX, RHEL and all the Fedora based distros and Debian based (several 100's of OS's), all the BSD distros, Solaris, AIX and HP-UX.