MongoDB Replica Setup

Nhan Cao

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Jun 28, 2021

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Setup MongoDB

* Check linux version: lsb_release -a
sudo apt install wget
wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -

* https://docs.mongodb.com/manual/tutorial/install-mongodb-on-debian/
* Debian 10 "Buster"
echo "deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.4 main" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

* https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/
* Ubuntu 20.04 (Focal)
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

sudo apt update
sudo apt install -y build-essential
sudo apt install -y mongodb-org
sudo systemctl enable mongod
sudo service mongod start

• Controls

- Start: sudo service mongod start
- Verify status: sudo cat /var/log/mongodb/mongod.log or sudo systemctl status mongod
- Stop: sudo service mongod stop
- Restart: sudo service mongod restart
- Status: sudo systemctl status mongod

Config replica

• Option 1: Use separate 3 vps — 3 instances mongod
• Option 2: (For test) Use 1 vps and create 3 instances mongod with difference db path and port

Demonstration with Option 2

Replicaset information

N1: Primary Node 1
- Port: 2717
- DB Path: $HOME/mongos/db1
- Command: mkdir -p $HOME/mongos/db1; mongod --noauth…