ziritrion

Keybase proof

I hereby claim:

• I am ziritrion on github.
• I am alvaronp (https://keybase.io/alvaronp) on keybase.
• I have a public key whose fingerprint is 994B DE62 2EC6 1B1D 6B09 CADF 4DA5 4041 B876 23F8

To claim this, I am signing this object:

ziritrion

Basic git

1. Make sure your local copy of the selected branch is updated.
   1. Without overwriting anything
      • git fetch
   2. If you already fetched or you are ready to overwrite your local copy, then pull
      • git pull
2. Check your repo branches
   1. Local branches

• git branch

ziritrion

1. Start your instance from Cgloud console
2. (Local terminal) Change to your project
   1. gcloud projects list
   2. gcloud config set project my-project
3. Create the ssh blob for easier connection
   • gcloud compute config-ssh
4. Inside ~/ssh/ a new config file should appear with the necessary info to connect. The host name should be enough to connect via SSH
   • ssh instance.zone.project
5. In VSCode, with the Remote SSH extension, use the same instruction to add the necessary info in order to log into the instance. The passphrase will be asked.

ziritrion

1. SSH with local X (any X window should be run locally rather than remotely)
   • ssh -X user@instance
2. Leave a process running even when you leave the SSH session
   • Make your script executable with chmod +x main.py
   • 2 possible instructions:
     • If console output does not matter (console output is still available in nohup.out but only if execution is finished successfully):
       • nohup python main.py &
     • If output must be saved even if you interrupt the execution:
       • (bash) nohup python -u main.py > output.log &

• (zsh) nohup python -u main.py > output.log &!

ziritrion

Conda

1. Create a virtual environment
   • conda create --name my_env_name python=3.8 or whatever Python version you may need.
2. List available envs (2 different ways
   • conda env list
   • conda info --envs
3. Activate virtual env
   • conda activate my_env_name
4. Deactivate current environment

ziritrion

Python

Lists

• [1, 2, 3, 4, 5]

Power operator (2^5)

• 2 ** 5

Square root (power operator trick)

• 9 ** 0.5

ziritrion

Docker

Terminology

• Container: environment that runs an applications that is not dependent on the OS. Kind of like a lightweight VM. Containers are stateless; if you need to update the components inside, create another container instead.
• Image: template to create a container. Its components are defined by a Dockerfile.
• Volume: storage area detached from the container for maintaining state. There are 4 types:
  • Volumes: managed by Docker itself, they're stored in a separate part of the host filesystem (on Linux by default this would be var/lib/docker/volumes). Useful for production deployments.
  • Bind mounts: mount a specific directory or file from the host to the container, such as a project folder. Useful for development.
• Tmpfs mounts: mount a temporary file system in the container, which is stored in the host system's memory only, not on disk. Useful for sensitive information that should not be persisted between container restarts or for performance reaso

ziritrion

Install and setup Gcloud SDK

1. Download Gcloud SDK from this link and install it according to the instructions for your OS.
2. Initialize the SDK following these instructions.
   1. Run gcloud init from a terminal and follow the instructions.
   2. Make sure that your project is selected with the command gcloud config list

Creating a VM instance

1. From your project's dashboard, go to Cloud Compute > VM instance

ziritrion

How to handle SSH keys for multiple Github accounts and making it more convenient to login to servers.

• Generate SSH keys
• Log in to a remote server with your SSH key
• Add public key to Github for using git with ssh
• Use multiple SSH keys locally for multiple Github accounts - easy way
• Use multiple SSH keys locally for multiple Github accounts - annoying way

Generate SSH keys