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The guide below describes how to install Rocket.Chat on Ubuntu 20.04
Feel free to read.

To begin with, we update the package repositories and the system itself.

apt-get update -y

apt-get upgrade -y

We install the necessary packages:

apt-get install nginx gnupg2 git unzip build-essential curl software-properties-common graphicsmagick -y

The next step is to install Node.js

curl -sL https://deb.nodesource.com/setup_12.x | bash -

apt-get install nodejs -y

We can check the nodejs version by issuing the command:

node -v

We should get the result:

v12.19.0

The next step is to install MongoDB and configure it.

We download the key to the server by issuing the command:

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

We add a repository to the system:

add-apt-repository 'deb [arch=amd64] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse'

We install MongoDB

apt-get install mongodb-org -y

We run them in the system:

systemctl start mongod

systemctl enable mongod

Next, you need to edit the default MongoDB configuration file and define a replica set. You can do this with the following command:

nano /etc/mongod.conf

Add the following lines:

replication:
  replSetName: "replica01"

Save and close the file, and then restart the MongoDB service, to apply the configuration:

systemctl restart mongod

Then log into the MongoDB shell and enable the replica with the following command:

mongo

rs.initiate()

The log should look like this:

{
 "info2" : "no configuration specified. Using a default configuration for the set",
 "me" : "127.0.0.1:27017",
 "ok" : 1,
 "operationTime" : Timestamp(1605081439, 1),
 "$clusterTime" : {
  "clusterTime" : Timestamp(1605081439, 1),
  "signature" : {
   "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA ="),
   "keyId" : NumberLong(0)
  }
 }
}

We can exit MongoDB shell with the following command:

exit

Installation Rocket.Chat

We add a user to the system and give him the appropriate group by issuing the following commands:

useradd -m -U -r -d /opt/rocket rocket --shell /bin/bash

usermod -a -G rocket www-data

We will acquire the rights to the rocket directory:

chmod 750 /opt/rocket

Log in to the rocket user and download rocket.chat files:

its - rocket

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

We unpack the downloaded files and transfer them:

tar -xvzf rocket.chat.tgz

mv bundle Rocket.Chat

We go to the script directory and install it:

cd Rocket.Chat/programs/server

npm install

Once all dependencies are installed, you can exit the Rocket.Chat user with the following command:

exit

We create a service file to run on system startup

nano /etc/systemd/system/rocketchat.service

The content:

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

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

[Install]
WantedBy=multi-user.target

Remember to change the ROOT_URL = http value://rocket.yourdomain.com on your domain name!

We're reloading the daemon and starting the service:

systemctl daemon-reload

systemctl start rocketchat

systemctl enable rocketchat

The service start status can be checked by executing the command:

systemctl status rocketchat

It should look like this:

? rocketchat.service - Rocket.Chat server
     Loaded: loaded (/etc/systemd/system/rocketchat.service; disabled; vendor preset: enabled)
     Active: active (running) since Wed 2020-11-11 07:58:01 UTC; 24s ago
   Main PID: 19951 (node)
      Tasks: 11 (limit: 4691)
     Memory: 508.7M
     CGroup: /system.slice/rocketchat.service
             ??19951 /usr/bin/node /opt/rocket/Rocket.Chat/main.js

Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |      MongoDB Version: 4.0.21                             |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |       MongoDB Engine: wiredTiger                         |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |             Platform: linux                              |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |         Process Port: 3000                               |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |             Site URL: http://rocket.yourdomain.com  |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |     ReplicaSet OpLog: Enabled                            |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |          Commit Hash: e37d7ba8ed                         |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |        Commit Branch: HEAD                               |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? |                                                          |
Nov 11 07:58:21 ubuntu2004 rocketchat[19951]: ? +----------------------------------------------------------+

We configure the Nginx vhost to work with rocket.chat

We create a new vhost file :

nano /etc/nginx/sites-available/rocketchat.conf

The content:

upstream myrocketchat {
  server 127.0.0.1:3000;
}

server {
    listen 80;
    server_name rocket.yourdomain.com;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    location / {
        proxy_pass http://myrocketchat/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_host;

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forward-Proto http;
        proxy_set_header X-Nginx-Proxy true;

        proxy_redirect off;
    }
}

Remember to change a few values:

server 127.0.0.1:3000; – 127.0.0.1 we replace the ip of our server.

server_name rocket.yourdomain.com; – rocket.yourdomain.com zastępujemy adresem naszej domeny.

We create a symbolic link to activate vhost:

ln -s /etc/nginx/sites-available/rocketchat.conf /etc/nginx/sites-enabled/

The next step is to check if the vhost was created correctly:

nginx -t

And the result:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

If everything is ok, restart Nginx

service nginx restart

Now the Rocket.chat installation process should start under our domain or server IP

Enter an administrator name, address e-mail, password and click Continue. You should see the following page:

We fill in at our discretion.

The next step is to select the language and server type

We accept license:

That's all our rocket.chat is already installed and available under our domain!