MOBILE SECURITY

*INTRODUCTION* In the field of networking, the specialist area of network security consists of the provisions made in an underlying computer networksrtp, policies adopted by the network administrator to protect the network and the network-accessible resources from unauthorized access, and consistent and continuous monitoring and measurement of its effectiveness (or lack) combined together. Security Management … Read more

Rocket.Chat Installation Process(centos)

Rocket.Chat in CentOS

STEP 1-  Install necessary dependency packages

  • Update package list and configure yum to install the official MongoDB packages with the following yum repository file:
     sudo yum -y check-update

cat << EOF | sudo tee -a /etc/yum.repos.d/mongodb-org-4.0.repo
[mongodb-org-4.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/7/mongodb-org/4.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc
EOF


Configure Node.js to be installed via package manager:
      sudo yum install -y curl && curl -sL https://rpm.nodesource.com/setup_8.x | sudo bash -

Install build tools, MongoDB, nodejs and graphicsmagick:

      sudo yum install -y gcc-c++ make mongodb-org nodejs

      sudo yum install -y epel-release && sudo yum install -y GraphicsMagick

Using npm install inherits and n, and the node version required by Rocket.Chat:

sudo
npm install -g inherits n && sudo n 8.11.4


STEP 2- Install Rocket.Chat

Download the latest Rocket.Chat version:

      curl -L https://releases.rocket.chat/latest/download -o /tmp/rocket.chat.tgz
      tar -xzf /tmp/rocket.chat.tgz -C /tmp

Install (this guide uses /opt but feel free to choose a different directory):

      cd /tmp/bundle/programs/server && npm install

      sudo mv /tmp/bundle /opt/Rocket.Chat


STEP 3- Configure the Rocket.Chat service

Add the rocketchat user, set the right permissions on the Rocket.Chat folder and create the Rocket.Chat service file:

      sudo useradd -M rocketchat && sudo usermod -L rocketchat
      sudo chown -R rocketchat:rocketchat /opt/Rocket.Chat

cat << EOF |sudo tee -a /lib/systemd/system/rocketchat.service
[Unit]
Description=The Rocket.Chat server
After=network.target remote-fs.target nss-lookup.target nginx.target mongod.target
[Service]
ExecStart=/usr/local/bin/node /opt/Rocket.Chat/main.js
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=rocketchat
User=rocketchat
Environment=MONGO_URL=mongodb://localhost:27017/rocketchat?replicaSet=rs01 MONGO_OPLOG_URL=mongodb://localhost:27017/local?replicaSet=rs01 ROOT_URL=http://localhost:3000/ PORT=3000
[Install]
WantedBy=multi-user.target
EOF

Open the Rocket.Chat service file just created (/usr/lib/systemd/system/rocketchat.service) using sudo and your favourite text editor, and change the ROOT_URL environmental variable to reflect the URL you want to use for accessing the server (optionally change MONGO_URL, MONGO_OPLOG_URL and PORT):

MONGO_URL=mongodb://localhost:27017/rocketchat?replicaSet=rs01
MONGO_OPLOG_URL=mongodb://localhost:27017/local?replicaSet=rs01 ROOT_URL=http://your-host-name.com-as-accessed-from-internet:3000
PORT=3000

Setup storage engine and replication for MongoDB (mandatory for versions > 1), and enable and start MongoDB and Rocket.Chat:
     sudo sed -i "s/^#  engine:/  engine: mmapv1/"  /etc/mongod.conf
     sudo sed -i "s/^#replication:/replication:\n  replSetName: rs01/" /etc/mongod.conf
     sudo systemctl enable mongod && sudo systemctl start mongod
     mongo --eval "printjson(rs.initiate())"
     sudo systemctl enable rocketchat && sudo systemctl start rocketchat


STEP 4- Configure your Rocket.Chat server

Open a web browser and access the configured ROOT_URL (http://your-host-name.com-as-accessed-from-internet:3000), follow the configuration steps to set an admin account and your organization and server info.


 

DNS : The Domain Name System

domain name system - DNS

Why we use DNS? To know this follow the link http://t4test.com/blog/etchosts-the-host-file/ Because of sheer numbers of hosts on the Internet, we can’t use host’s file (/etc/hosts) them. The ineternet has centralized file in its teens, but its maintenance because so painful that Berkeley had to step in with the Domain Name System (DNS). DNS is a … Read more