toMongo5-(ubuntu 20.04).sh

#!/bin/bash

# Stop the mongod process
sudo systemctl stop mongod

# Remove any MongoDB packages that you had previously installed.
sudo apt-get purge mongodb*

# Remove MongoDB databases and log files.
sudo rm -r /var/log/mongodb
sudo rm -r /var/lib/mongodb

# Delete source-list file:
sudo rm -f /etc/apt/sources.list.d/mongodb*

# List out any mongo packages(if any)
sudo apt-get update | grep mongo

# Import the public key
wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add -

# For Ubuntu 20.04
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list

# List out any mongo packages(if any)
sudo apt-get update | grep mongo

# Install the MongoDB packages.
sudo apt-get install -y mongodb-org

# Enable mongod on system startup
sudo systemctl enable mongod

# Start mongod server:
sudo systemctl start mongod

echo "Now, follow these instructions:"

replicateConf='\n# Add the replica config in mongod.conf file:\nreplication:\n oplogSizeMB: 256\n replSetName: rs0\n enableMajorityReadConcern: true\n'
initiaters='\n# Initiate the replica set:\nmongosh --eval "rs.initiate()"\n'
restartBash='\n# Restart the terminal\n'
reinitiaters='\n# Initiate the replica set:\nmongosh --eval "rs.initiate()"\n'

echo -e $replicateConf $initiaters $restartBash $reinitiaters

# If you get "not started as node process" issue: ()
$ mongosh --eval "db.adminCommand( { shutdown : 1} )"
$ sudo systemctl start mongod