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mongodump command example

mongodump --host localhost:27017 --username=user --password=password --db=db_name --authenticationDatabase=admin

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Create GitLab project deploy key

Generate key

cd ~/.ssh/
ssh-keygen -t ed25519 -C "project_name_deployment"

• Input a file path to save your SSH key pair to. Example project_name_deployment_rsa
• Enter a passphrase if you want. You can skip creating it by pressing Enter twice.
• Backup the key somewhere safe and secure

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Expose localhost port 8000 to the internet

ssh -R 80:localhost:8000 serveo.net

https://serveo.net/

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Angular Observables notes

https://angular.io/guide/rx-library

• A promise can be subcribed.
• It will give an observable.

const secondsCounter = interval(1000);
secondsCounter.subscribe(n =>
  console.log(`It's been ${n} seconds since subscribing!`));

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Named tuples

from collections import namedtuple
Point = namedtuple('Point', ['x', 'y'])

point1 = Point(24, 67)
print(point1.x)
print(point1.y)

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All you need is your rsa key file

cp name_rsa ~/.ssh/
chmod 400 ~/.ssh/name_rsa

cat >> ~/.ssh/config <<EOF
Host dev.website.com my_connection_name
Hostname {server_ip_address}
User {username}

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export $(grep -v '^#' .env | xargs)

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start a new screen session with session name

$ screen -S <name>

list running sessions/screens

$ screen -ls

attach to a running session

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Show all opened ports

$ sudo firewall-cmd --list-all

To open up a new port (e.g., TCP/80) permanently, use these commands. Without --permanent flag, the firewall rule would not persist across reboots.

sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
sudo firewall-cmd --reload

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The following operations need to be run on a unix system. You can use Bash on Windows is you have a Windows OS.

Install redis client

$ sudo apt-get install redis-tools

Create script file

Create the following bash file