Today I Learned

Useful little things I have learned

74 TILs and counting...

• ansible
• caddy
• calibre
• docker
• git
• gpg
• kubernetes
• letsencrypt
• linux
• neomutt
• networking
• pihole
• python
• raspberry-pi
• reverse-proxy
• selfhosting
• shell
• ssh
• terminal
• termux
• tmux
• vim
• vpn
• web
• windows

• Using ansible inventory in python

• Create a simple fileserver Caddy file with directory index

• Allow calibre to mount ereaders automatically using udisks

• Update existing images with docker-compose
• Add DNS server to Docker
• Get UFW working with Docker
• Sharing an SSH Agent between a host machine and a Docker container
• How to login using root user into docker container
• Setting up a nginx directory listing with docker compose
• Run docker container interactively with bash
• Run a docker container using cronjob on the host
• Set docker log size

• Change the author name and email for multiple commits
• Clear Git History
• Creating and applying patches
• Git cheatsheet
• Use GPG to sign old commits
• How to merge multiple git repositories and keep commit history
• Merge two git repositories and keep history
• Migrate git repo from one host to another
• Setup multiple git identities & git user informations
• Removing Sensitive Data from Git History
• How to split a subdirectory to a new git repo while keeping history

• GPG agent forwarding over SSH
• A Cheatsheet for common gpg commands

• Set up K3S cluster

• Letsencrypt DNS acme challenge on Namecheap

• Disable authentication delay
• Create compressed encrypted archives with tar and gpg
• Environmental Variables in cron
• Using dig and host
• Increase login attempts
• Setup gnome keyring
• Modify LUKS iter-time on existing luks partition
• How to Mount Windows Share on Linux using CIFS
• Convert multi-line ssh public key to one-line for .ssh/authorized_keys
• Set up device as NTP server
• Running Systemd Service as User Rather Than Root
• Change systemd-boot timeout
• Unlock user after too many failed sudo attempts
• Allow commands to be run without password (visudo - NOPASSWD)
• Set defaults for extensions using xdg-mime

• Neomutt cheatsheet

• Avoid conflict between dnsmasq and systemd-resolved

• Fix DNS issues of docker containers on the same host

• Using a list of dictionaries as variables to render a jinja2 template
• How to open an jinja2 template from a file
• Using virtual environment in Jupyter Notebook

• Set a static IP address with nmtui on Raspberry Pi OS 12 'Bookworm'

• Practical Configuration of Traefik as a Reverse Proxy For Docker

• Setup Authelia to work with Nginx Proxy Manager

• Bash git prompt
• Better Bash tab completion
• Create and populate an array of directories in bash
• How to Use xargs on Linux
• Mount an external harddrive as local user
• Sweep pings in a certain subnet
• Run sudo commands over ssh
• Test if DHCP is working
• Run sudo commands without passwords

• Ignore ssh config file
• Prevent hostkey from being saved

• Terminal Colors

• Send SMS with termux

• Clipboard conditional to OS
• SSH agent forwarding with tmux

• Enable system clipboard over ssh
• Debug option settings
• Format JSON in Vim
• Sort lines based on a column in Vim/Nvim
• Vim Cheatsheet

• Wireguard

• Check TXT records

• Set faster keyboard repeat rate on windows 10