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
- 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 --bind_ip_all --port 2717 --dbpath $HOME/mongos/db1 --replSet rs0N2: Secondary Node 2
- Port: 2727
- DB Path: $HOME/mongos/db2
- Command: mkdir -p $HOME/mongos/db2; mongod --noauth --bind_ip_all --port 2727 --dbpath $HOME/mongos/db2 --replSet rs0N3: Secondary Node 3
- Port: 2737
- DB Path: $HOME/mongos/db3
- Command: mkdir -p $HOME/mongos/db3; mongod --noauth --bind_ip_all --port 2737 --dbpath $HOME/mongos/db3 --replSet rs0
Useful commands for Primary Node
- rs.status(): Tells the status of replica set
- rs.initiate(): Initiates a replica set on primary node
- rs.add(“localhost:2727”): Adds a member to replica set
- rs.remove(“localhost:2727”): Removes a member from replica set
Setup
- Open 3 terminal sessions to create 3 instances mongodb as 3…
