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Cheatsheet

LDAP

-- Query a user 

ldapsearch -x uid="USERNAME_HERE"

-- Query user as root for more detailed info 

ldapsearch -D "cn=root,ou=services,o=redbrick" -y /etc/ldap.secret uid=user

-- Find all users emails created by USERNAME 

ldapsearch -x createdby="user" uid | awk '/uid:/ {print $2"@redbrick.dcu.ie"}'

-- Check if something is backed up on NFS (/storage/path/to/file)

All useful LDAP scripts (edit user quota, reset user password, renew user accounts, etc) are located in the home directory of root on Azazel.

Log in as root on a server with local accounts: 

ssh localaccount@redbrick.dcu.ie
sudo -i # (same password as localaccount account)

Authentication/Passwords

Onboarding new admins

  • Create root ssh key for NixOS Machines Following creation of the key, add to the whitelist in nix configs.
ssh-keygen -t ed25519 # Generate key
cat ~/.ssh/id_ed25519.pub # Verify it's been created
ssh-copy-id -i ~/.ssh/id_ed25519 user@redbrick.dcu.ie # Copy to local account's ssh dir
ssh -i ~/.ssh/mykey user@redbrick.dcu.ie # Verify that this key was copied

Access passwordsafe (pwsafe)

Location of master password vault.

Note: getpw will prompt you for the Master root password. 

ssh localroot@halfpint
sudo -i # to log in as root with local user password
pwsafe # to list passwords
getpw <name_of_pass> # Grab password by name key | getpw pygmalion

SSH to root on a NixOS machine

  • From the account you generated your ssh key on (in nix configs) type: 
    ssh root@hardcase.internal

NixOS

-- Install a temporary program 

nix-shell -p [space seperated package names]

-- Run brickbot2 (running on Metharme) 

cd brickbot2
nix-shell
source venv/bin/activate
python3 main.py config.toml

Brickbot runs in tmux a -t 0 and can be restarted by pressing ctrl+c and running the above python command

Minecraft Servers

The Redbrick Minecraft server's are dockerized applications running on Zeus on a server-per-container basis, using the tools on this GitHub Repo: https://github.com/itzg/docker-minecraft-server#interacting-with-the-server

Repo is very well documented so have a look at the README but here's the basics:

NOTE: Local Root accounts must be added to the docker group before they can run the docker commands. usermod -a -G docker ACCOUNT_NAME

You can docker ps | grep minec to find the docker containers running the servers.

The docker compose files are located in /etc/docker-compose/services, Unmodded Vanilla compose for example is in /etc/docker-compose/services/minecraft_unmodded/

To see the configuration for the container you can do docker inspect CONTAINER_NAME_OR_ID

  • Interacting with the Server Console
    • https://github.com/itzg/docker-minecraft-server#interacting-with-the-server
Last update: 2023-09-27