Databasee

Install:

Install MongoDB

# Ubuntu 18.04 LTS
sudo apt-get install gnupg

wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | sudo apt-key add -

echo "deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" | sudo tee /etc/apt/sources.list.d/mongodb.list


sudo apt install mongodb-org

sudo systemctl enable mongod
sudo systemctl start mongod 

# whitelist IPs : https://www.digitalocean.com/community/tutorials/how-to-install-mongodb-on-ubuntu-18-04

# Validate: mongo --eval 'db.runCommand({ connectionStatus: 1})'

Configure DB

Admin config

#1) disable security (/etc/mongod.conf) --> Restart Mongodb
#> security:
#>   authorization: "disabled"

#2) drop admin user if exist
mongo admin --eval 'db.dropUser("superadmin")'
#3) create admin user
mongo admin --eval 'db.createUser( { user: "superadmin", pwd: "MyPass1234", roles: [ { role: "clusterAdmin", db: "admin" }, { role: "userAdminAnyDatabase", db: "admin" } ] } )'
#4) enable security (/etc/mongod.conf) --> Restart Mongodb
#> security:
#>   authorization: "enabled"

App user config

mongo admin --eval 'db.createUser( { user: "todo", pwd: "todo", roles: [ { role: "readWrite", db: "test" } ] } )'

Network config

• Replace the value of bindIp in /etc/mongod.conf

sed -i 's/127.0.0.1/0.0.0.0/g' /etc/mongod.conf

Backend

Prebuild:

• Install go

Build

• Checkout source code
• Run go build

Run Manually

Check connectivity with DB

nc -zv <db-hostname> 27017

From source code

export DB_CONNECTION=mongodb://user:pass@localhost:27017 \
       DB_NAME=test
go run main.go

Or From build artifact

export DB_CONNECTION=mongodb://user:pass@localhost:27017 \
       DB_NAME=test
/artifact-build-file

Run Production grade

1 - Create Systemd Service Todo which populates (2) & manages (3) -> notify: systemctl reload-daemon

2 - Put env vars in seperated file ( /etc/todo.env)

3 - Move build file from /tmp/todo to a standard place (/usr/local/bin/todo) -> notify: systemctl restart todo

Deploy

• systemd service

Frontend

Prebuild:

• Install nodejs

Build

• Checkout source code
• Run npm install

Run Manually

# Set REACT_APP_API_ENDPOINT, then
npm start

Run Production grade

npm install pm2 -g
# Set REACT_APP_API_ENDPOINT, then
# Start App with pm2
pm2 start node_modules/react-scripts/scripts/start.js --name todo