A Rocket. Chat App is an integration or a plugin which is created in an isolated environment. You can also create your own App and publish it on our official Marketplace to share with the world. Users can download your application from the marketplace and use it.

rocket chat.sh

##Step 1: Install MongoDB

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4

echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.0.list

sudo apt update
sudo apt install -y mongodb-org

sudo systemctl stop mongod.service
sudo systemctl start mongod.service
sudo systemctl enable mongod.service

sudo systemctl status mongod

sudo nano /etc/mongod.conf

#Then copy and paste the lines at the end of the file and save..

replication:
 replSetName: "rs01"
 
# or 
echo -e "replication:\n  replSetName: \"rs01\"" | sudo tee -a /etc/mongod.conf

sudo systemctl restart mongod
sudo systemctl status mongod

mongo

rs.initiate()


##Step 2: Install Node.js

#Rocket.Chat only support Node.js from the 8.x repository…

sudo apt install nodejs npm build-essential curl software-properties-common graphicsmagick 

sudo npm install -g inherits n && sudo n 12.14.0

##Step 3: Install Rocket.Chat Server

sudo useradd -m -U -r -d /opt/rocketchat rocketchat
sudo su - rocketchat

curl -L https://releases.rocket.chat/latest/download -o rocket.chat.tgz

tar zxvf rocket.chat.tgz
mv bundle Rocket.Chat
cd /opt/rocketchat/Rocket.Chat/programs/server
npm install


export ROOT_URL=http://localhost:3000
export MONGO_URL=mongodb://localhost:27017/rocketchat
export MONGO_OPLOG_URL=mongodb://localhost:27017/local?replSet=rs01
export PORT=3000

cd /opt/rocketchat/Rocket.Chat/

node main.js

exit
exit

sudo nano /etc/systemd/system/rocketchat.service

#Then copy and paste the lines below into the file and save…

[Unit]
Description=Rocket.Chat server
After=network.target nss-lookup.target mongod.target

[Service]
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=rocketchat
User=rocketchat
Environment=MONGO_URL=mongodb://localhost:27017/rocketchat MONGO_OPLOG_URL=mongodb://localhost:27017/local?replSet=rs01 ROOT_URL=http://example.com PORT=3000
ExecStart=/usr/local/bin/node /opt/rocketchat/Rocket.Chat/main.js

[Install]
WantedBy=multi-user.target


sudo systemctl daemon-reload
sudo systemctl enable rocketchat
sudo systemctl start rocketchat


sudo systemctl status rocketchat


http://localhost:3000


##Video Tetorial
https://youtu.be/MIYcN05-U9s